Changcheng Zheng

Journal Article The journal of physical chemistry letters · November 2024 Anomalous thermal behaviors of excitonic luminescence in CsPbBr3 perovskite quantum dots (PQDs) were observed. It is found that the main luminescence peak originated from the excitonic radiative recombination assisted by the longitudinal-optical ... Full text Cite

Optical detection of passive thermal lattice deformation of monolayer WS2 in van der Waals heterostructures of WS2/h-BN

Journal Article Journal of Alloys and Compounds · September 15, 2024 Van der Waals heterostructures (vdWHs) of the constituent two-dimensional (2D) layered materials are quickly emerging as functional structures for diverse novel electronic and optoelectronic devices. To further explore the device applications of the vdWHs, ... Full text Cite

Impact of the rhenium substitution on the oxygen evolution reaction of spinel CoFe2O4

Journal Article Journal of Materials Chemistry A · June 25, 2024 Structure engineering is a powerful tool for tuning various properties and making CoFe2O4 (CFO) a prime candidate for electrocatalyst applications, especially in improving the oxygen evolution reaction (OER) performance. In this work, we explored rhenium s ... Full text Cite

Recombination dynamics and pronounced re-absorption effect in ZnO single crystals under two-photon excitation

Journal Article Journal of Physics D: Applied Physics · March 8, 2024 Time-resolved photoluminescence measurements were conducted on ZnO single crystals using two-photon (2P) excitation at low temperatures ranging from 25 to 260 K. The decay constants of various emission peaks are determined and compared between one-photon a ... Full text Cite

High-excited-state splitting and multimode vibrational coupling in Mn⁴⁺-activated fluoride phosphor

Journal Article Science China: Physics, Mechanics and Astronomy · March 1, 2024 Excited-states play a crucial role in the optical absorption and luminescence of solids and hence their accurate information is highly desired. Herein, we attempt to seize the excited-states information of Mn4+ ions in K2SiF6 microcrystals via measuring an ... Full text Cite

Optical properties of Sr2LuNbO6:Mn⁴⁺ deep-red phosphor: crystal-field splitting and multimode vibrational coupling

Journal Article Science China Materials · March 1, 2024 In this study, the optical properties of Sr2LuNbO6:Mn4+ deep-red phosphor synthesized with a molten salt solid-phase method were investigated in detail by using photoluminescence (PL), PL excitation (PLE), time-resolved PL, and Raman spectroscopic techniqu ... Full text Cite

Effects of the excitation wavelength and temperature on the zero-phonon emission line of Cr:YAG.

Journal Article Applied optics · January 2024 In this work, a detailed study was conducted of the temperature and excitation wavelength-dependent photoluminescence (PL) spectra of the chromium-doped yttrium aluminum garnet (Cr:YAG) transparent ceramic. Focusing on the two sets of zero-phonon lines (ZP ... Full text Cite

Manipulation of Temperature-Dependent Luminescence Behaviors of Mn⁴⁺-Activated Fluoride Phosphors.

Journal Article The journal of physical chemistry letters · July 2023 In this paper, the giant tunability of thermal behaviors, i.e., from thermal deterioration to substantial growth, is firmly demonstrated for the vibronic luminescence of Mn4+ ions in fluoride phosphors. Such peculiar behavior is uncovered to be ... Full text Cite

Interband transitions of InAs/AlAs Short-Period superlattices grown by molecular beam epitaxy

Journal Article Journal of Crystal Growth · March 1, 2023 In this work, we use spectroscopic ellipsometry (SE) to study the optical properties of InAsn/AlAsn short-period superlattices (SPS) with different period thicknesses for a wide wavelength range of 250 nm − 1650 nm (about 0.75 eV – 5 eV). Additionally, the ... Full text Cite

Temperature evolution of the Fano line shape in the Raman spectra of BaTiO3nanoparticles

Journal Article Applied Physics Express · March 1, 2023 The Fano line shape at about 185 cm-1 is observed in temperature-dependent Raman spectra of BaTiO3 nanoparticles. The dip structure appears at the low-energy side, indicating a positive asymmetric parameter q, which is assigned to the interference between ... Full text Cite

Strain evolution and confinement effect in InAs/AlAs short-period superlattices studied by Raman spectroscopy.

Journal Article Scientific reports · January 2023 Raman spectra of two series of InAs/AlAs short-period superlattices were measured at room temperature to investigate the impact of strain on the phonon modes taking into consideration the confinement effect and interface mode. The evolution of strain in th ... Full text Cite

Carrier localization effect in the photoluminescence of In composition engineered InAlAs random alloy

Journal Article Journal of Luminescence · September 1, 2022 Detailed spectral structures in the low-temperature photoluminescence (3.5 K) of an InAlAs random alloy grown by molecular beam epitaxy on an InP substrate were studied, with three clearly distinguished emission peaks. Based on the temperature-dependent ph ... Full text Cite

Depth profiled polarization effects in AlGaN quantum wells probed with interconnected cathodoluminescence spectroscopy and ion sputtering

Journal Article Applied Physics Express · July 1, 2022 Based on interconnected ion sputtering and cathodoluminescence spectroscopy, an optical spectroscopic strategy has been developed to profile depth-dependent polarization effects in an AlGaN multiple-quantum-well structure. Two emission bands at about 258 n ... Full text Cite

Temperature-Dependent Electroluminescence of Phosphor-Converted White LEDs With K2SiF6:Mn⁴⁺Below Room Temperature

Journal Article IEEE Electron Device Letters · April 1, 2022 High-efficiency Mn4+-activated red phosphor of K2SiF6:Mn4+ synthesized at low temperature was utilized to fabricate phosphor-converted white light-emitting diodes (pc-WLEDs). Temperature-dependent electroluminescence (EL) measurements were undertaken at a ... Full text Cite

Fine Photoluminescence Spectroscopic Characterization of Interfacial Effects on Emission Properties of InGaN/GaN Multiple Quantum Wells in a Blue-Light Laser Diode Structure

Journal Article Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis · April 1, 2022 In growing InGaN/GaN multiple quantum wells (MQWs) with the technique of metal-organic chemical vapor deposition (MOCVD), the introduction of an appropriate amount of H2 into the N2 carrier gas for the growth of the GaN barrier layers can effectively impro ... Full text Cite

Deep insight into the luminescence performance of Li2MgSiO4:Mn²⁺ green phosphor synthesized by a sol-gel process

Journal Article Journal of Luminescence · February 1, 2022 A sol-gel process together with a low-temperature sintering technique was applied for preparing Mn2+ activated Li2MgSiO4 green phosphor. Phase structure information was derived from the Rietveld refinement on its powder X-ray diffraction pattern. The lumin ... Full text Cite

Suppression of Surface Defects and Vibrational Coupling in GaN by a Graphene Monolayer

Journal Article Physica Status Solidi - Rapid Research Letters · February 1, 2022 The optical transitions and random walking dynamics of the three types of excitons, namely, free, donor-bound, and acceptor-like surface-defect-bound excitons, in both the graphene−GaN hybrid structure and bare GaN are comparatively examined using variable ... Full text Cite

Investigation of carrier migration from WS2 monolayer to substrate by photoluminescence

Journal Article Journal of Luminescence · January 1, 2022 Carriers in atomically thin two-dimensional (2D) semiconductors like WS2 monolayers are prone to interact with their surroundings, which may have a significant impact on both the electric and optical properties of 2D semiconductors. In this work, abnormal ... Full text Cite

Luminescence performance and vibronic behavior of Mn⁴⁺-activated Ca_14-xK_xAl₁₀Zn₆O₃₅ deep-red phosphor.

Journal Article Optics letters · December 2021 In this study, a significant improvement of deep-red luminescence was successfully achieved via the substitution approach in the Mn4+-activated Ca14-xKxAl10 ... Full text Cite

Local laser heating effects in monolayer WS2 probed by photoluminescence

Journal Article Applied Surface Science · October 1, 2021 In this article, we report the local heating effects induced by laser irradiation in mechanically exfoliated WS2 monolayers and the characterization of the resulting inhomogeneous temperature field with the technique of photoluminescence spectroscopy. By c ... Full text Cite

Selective Excitation of CdSe/CdS Dot-in-Rod Nanocrystals and Distinct Roles of Electrons and Holes in Photophysical and Photochemical Interactions with Ambient Air

Journal Article Physica Status Solidi (B) Basic Research · August 1, 2021 CdSe/CdS dot-in-rod (DiR) nanocrystals are an advantageous heterostructured semiconductor system with a quasi-type-II electronic band structure, which enables a rich diversity of optical manipulation of carrier excitations and interactions. Herein, the sel ... Full text Cite

Elimination of interlayer Schottky barrier in borophene/C₄N₄ vdW heterojunctions via Li-ion adsorption for tunneling photodiodes

Journal Article Journal of Materials Chemistry C · 2021 The adsorption of Li-ions on the bottom site contributes to improve the photodetectivity and photoresponsivity in B/C4N4 vdW heterojunction photodiode, owing to the elimination of interlayer Schottky barrier. ... Full text Cite

Hierarchical molybdenum-doped cobaltous hydroxide nanotubes assembled by cross-linked porous nanosheets with efficient electronic modulation toward overall water splitting.

Journal Article Journal of colloid and interface science · March 2020 Designing hierarchical nanostructures of earth-abundant electrocatalysts for enhanced overall water splitting performance is of great significance. Herein, Mo-doped Co(OH)2 hierarchical nanotubes (Mo-Co(OH)2 HNTs) assembled by cross-l ... Full text Cite

Rewritable Optical Memory Based on Sign Switching of Magnetoresistance

Journal Article Advanced Electronic Materials · January 1, 2020 Discovering ways to control magnetic states by light is very attractive for prospective applications of optical–magnetic sensing and recording. Although several studies have demonstrated the light-induced switching of magnetization, the magnetoresistance e ... Full text Cite

Quantum cascade superluminescent light emitters with high power and compact structure

Journal Article Journal of Semiconductors · January 1, 2020 Quantum cascade (QC) superluminescent light emitters (SLEs) have emerged as desirable broadband mid-infrared (MIR) light sources for growing number of applications in areas like medical imaging, gas sensing and national defense. However, it is challenging ... Full text Cite

Realization of high-performance tri-layer graphene saturable absorber mirror fabricated via a one-step transfer process

Journal Article Journal of Semiconductors · January 1, 2020 Graphene, as a saturable absorber (SA), has attracted much attention for its application in ultrashort pulse fiber lasers due to its ultrafast interband carrier relaxation and ultra-broadband wavelength operation. Nevertheless, during the stacking process ... Full text Cite

InAs/GaAs quantum dot semiconductor saturable absorber for controllable dual-wavelength passively Q-switched fiber laser.

Journal Article Optics express · July 2019 We experimentally demonstrate the first use of 1550-nm InAs/GaAs quantum dot semiconductor saturable absorber mirror (QD-SESAM) in the dual-wavelength passively Q-switched (QS) erbium doped fiber (EDF) laser. The dual-wavelength QS lasing was obtained at a ... Full text Cite

Facile in situ fabrication of Co nanoparticles embedded in 3D N-enriched mesoporous carbon foam electrocatalyst with enhanced activity and stability toward oxygen reduction reaction

Journal Article Journal of Materials Science · April 15, 2019 Oxygen reduction reaction (ORR) is a crucial reaction for various energy conversion and storage devices, but the sluggish kinetics and the usage of noble metals greatly restrict its practical device applications. In this work, a well-designed high-performa ... Full text Cite

Behavior of Raman modes in InPBi alloys under hydrostatic pressure

Journal Article AIP Advances · March 1, 2019 Raman spectra of InPBi alloys with bismuth amount 0.3%-2.0% were measured under hydrostatic pressure in diamond anvil cell up to ∼4 GPa at room temperature. Two bismuth related Raman modes were identified and their evolutions under pressure were studied. T ... Full text Open Access Cite

A new photocatalyst based on Co(CO3)0.5(OH)·0.11H2O/Bi2WO6 nanocomposites for high-efficiency cocatalyst-free O2 evolution

Journal Article Chemical Engineering Journal · March 1, 2019 The practical application of photocatalytic water splitting is essentially limited by the slow kinetic nature of the water oxidation process. Therefore, it is highly desirable but challenging to explore a low-cost and high-efficiency water oxidation cataly ... Full text Cite

Electrospinning preparation of Sn⁴⁺-doped BiFeO3 nanofibers as efficient visible-light-driven photocatalyst for O2 evolution

Journal Article Journal of Alloys and Compounds · October 25, 2018 Metal ion doping has been regarded as an effective strategy to improve photocatalytic activity of pristine photocatalysts for rapid charge transfer and separation effects achieved by doping induced defect states. We herein report the fabrication of uniform ... Full text Cite

Development of Modulation p-Doped 1310 nm InAs/GaAs Quantum Dot Laser Materials and Ultrashort Cavity Fabry-Perot and Distributed-Feedback Laser Diodes

Journal Article ACS Photonics · March 21, 2018 Multiple-layer InAs/GaAs quantum dot (QD) laser structures were etched to remove the p-side AlGaAs cladding layers to investigate the temperature-dependent photoluminescence (PL) characteristics. Four QD samples, including undoped as grown QDs, p-doped as ... Full text Cite

Construction of hierarchical FeP/Ni2P hollow nanospindles for efficient oxygen evolution

Journal Article Journal of Materials Chemistry A · January 1, 2018 In this work, we demonstrate the design and construction of hierarchical FeP/Ni2P hybrid hollow nanospindles (HNSs) as an active and stable electrocatalyst for the oxygen evolution reaction (OER). Employing solid FeOOH NSs coated with a thin layer of SiO2 ... Full text Cite

Realization of III-V Semiconductor Periodic Nanostructures by Laser Direct Writing Technique.

Journal Article Nanoscale research letters · December 2017 In this paper, we demonstrated the fabrication of one-dimensional (1D) and two-dimensional (2D) periodic nanostructures on III-V GaAs substrates utilizing laser direct writing (LDW) technique. Metal thin films (Ti) and phase change materials (Ge2 Full text Cite

Band-gap engineering of porous BiVO4 nanoshuttles by Fe and Mo co-doping for efficient photocatalytic water oxidation

Journal Article Inorganic Chemistry Frontiers · December 1, 2017 Co-doping of metal ions in semiconductor photocatalysts is a promising strategy to promote photocatalytic activity due to its expected synergistic effects. In this study, we demonstrated the first synthesis of uniform Fe and Mo co-doped BiVO4 (Fe/Mo-BVO) p ... Full text Cite

Extinction of the zero-phonon line and the first-order phonon sideband in excitonic luminescence of ZnO at room temperature: the self-absorption effect.

Journal Article Science bulletin · November 2017 It is firmly demonstrated in experiment that the self-absorption (SA) effect can lead to the extinction of the zero-phonon line and the first-order longitudinal optical phonon sideband of free excitonic luminescence of ZnO at room temperature. Moreover, ef ... Full text Cite

Facile preparation of ternary Ag2CO3/Ag/PANI composite nanorods with enhanced photoactivity and stability

Journal Article Journal of Materials Science · April 1, 2017 One-dimensional ternary nanostructures, Ag2CO3 nanorod cores coated with an intermediate layer of Ag nanoparticles (NPs) and a sheath of conducting polymer polyaniline (PANI), Ag2CO3/Ag/PANI composite nanorods (CNRs), were successfully prepared via a facil ... Full text Cite

Triplet harvesting in luminescent Cu(i) complexes by the thermally activated luminescence transition mechanism: Impact of the molecular structure

Journal Article Journal of Materials Chemistry C · January 1, 2017 Thermally induced transition from ordinary phosphorescence to delayed fluorescence in two kinds of luminescent copper(i) complexes is comprehensively investigated by using variable-temperature time-integrated and time-resolved photoluminescence measurement ... Full text Cite

Unusual formation of tetragonal microstructures from nitrogen-doped carbon nanocapsules with cobalt nanocores as a bi-functional oxygen electrocatalyst

Journal Article Journal of Materials Chemistry A · January 1, 2017 A facile non-template solid-state reaction method has been developed for the first time preparation of a tetragonal microstructure self-assembled from nitrogen-doped carbon nanocapsules containing metallic cobalt nanoparticles (Co-N-C) by using graphitic c ... Full text Cite

Who make transparent ZnO colorful? – Ion implantation and thermal annealing effects

Conference Superlattices and Microstructures · November 1, 2016 ZnO has re-attracted considerable interest as a wide band gap semiconductor and energy material in recent years. When most of the near-band-edge exciton sharp lines in the ultraviolet spectral region have been firmly identified, defect origins of broad col ... Full text Cite

Influence of curvature strain and Van der Waals force on the inter-layer vibration mode of WS2 nanotubes: A confocal micro-Raman spectroscopic study.

Journal Article Scientific reports · September 2016 Transition-metal dichalcogenides (TMDs) nanostructures including nanotubes and monolayers have attracted great interests in materials science, chemistry to condensed matter physics. We present an interesting study of the vibration modes in multi-walled tun ... Full text Cite

Carrier Localization Effects in InGaN/GaN Multiple-Quantum-Wells LED Nanowires: Luminescence Quantum Efficiency Improvement and "Negative" Thermal Activation Energy.

Journal Article Scientific reports · September 2016 Two-dimensional InGaN/GaN multiple-quantum-wells (MQW) LED structure was nanotextured into quasi-one-dimensional nanowires (NWs) with different average diameters with a combination approach of Ni nanoislands as mask + dry etching. Such nanotexturing bring ... Full text Cite

Facile synthesis of porous Bi2O3-BiVO4p-n heterojunction composite microrods with highly efficient photocatalytic degradation of phenol

Journal Article Journal of Alloys and Compounds · January 1, 2016 In the present work, high-quality porous Bi2O3-BiVO4composite microrods (CMRs) with a uniform size distribution have been successfully prepared through a facile solvothermal method followed by an annealing treatment, in which Bi(OH)C2O4-BiVO4precursors wer ... Full text Cite

Facile one-pot solvothermal preparation of Mo-doped Bi2WO6 biscuit-like microstructures for visible-light-driven photocatalytic water oxidation

Journal Article Journal of Materials Chemistry A · January 1, 2016 The adsorption behavior and the separation efficiency of photogenerated electron-hole pairs are two important elements in estimating the photocatalytic activity of a photocatalyst. In this work, we have developed a facile one-pot solvothermal method for th ... Full text Cite

Photoinduced doping and photoluminescence signature in an exfoliated WS2 monolayer semiconductor

Journal Article RSC Advances · January 1, 2016 Following graphene, atomically thin two-dimensional transition metal dichalcogenides (2D-TMDs) are quickly emerging as a new multidisciplinary frontier across condensed matter physics, materials science and inorganic chemistry. Compared with graphene, the ... Full text Cite

Strong quantum confinement effect and reduced Fröhlich exciton-phonon coupling in ZnO quantum dots embedded inside a SiO2 matrix.

Journal Article Nanoscale · November 2015 ZnO quantum dots (QDs) embedded in an amorphous SiO2 matrix were examined in depth by using variable-temperature photoluminescence (PL) and optical reflectance spectroscopies. Compared with ZnO bulk crystals, ZnO quantum dots with an average size of 4 nm e ... Full text Cite

Beyond spatial correlation effect in micro-Raman light scattering: An example of zinc-blende GaN/GaAs hetero-interface

Journal Article Journal of Applied Physics · August 21, 2015 Spatially resolved Raman light scattering experiments were performed on a zinc-blende GaN/GaAs heterostructure with confocal micro-Raman scattering technique under the backscattering geometric configuration. By varying the illumination spot locations acros ... Full text Cite

Direct coating ZnO nanocrystals onto 1D Fe3O4/C composite microrods as highly efficient and reusable photocatalysts for water treatment

Journal Article Journal of Alloys and Compounds · July 15, 2015 In this wok, we demonstrated a facile two-step method to directly coat a ZnO nanocrystal layer on the surface of one-dimensional (1D) Fe3O4/C composite microrods to form Fe3O4/C@ZnO core-shell microrods. Firstly, 1D Fe3O4/C composite microrods were success ... Full text Cite

Facile formation of Ag2WO4/AgX (X = Cl, Br, I) hybrid nanorods with enhanced visible-light-driven photoelectrochemical properties

Journal Article Materials Research Bulletin · January 1, 2015 In this work, we demonstrated a general strategy for the preparation of a series of uniform Ag2WO4/AgX (X = Cl, Br, I) hybrid nanorods by a facile in-situ anion exchange reaction occurring at room temperature between pregrown Ag2WO4 nanorods and different ... Full text Cite

Luminescence signature of free exciton dissociation and liberated electron transfer across the junction of graphene/GaN hybrid structure.

Journal Article Scientific reports · January 2015 Large-area graphene grown on Cu foil with chemical vapor deposition was transferred onto intentionally undoped GaN epilayer to form a graphene/GaN Schottky junction. Optical spectroscopic techniques including steady-state and time-resolved photoluminescenc ... Full text Cite

Photoluminescence and Raman mapping characterization of WS2 monolayers prepared using top-down and bottom-up methods

Journal Article Journal of Materials Chemistry C · January 1, 2015 Two kinds of tungsten disulfide (WS2) monolayers, respectively prepared using top-down and bottom-up approaches, were studied with Raman and photoluminescence (PL) mapping techniques. By mapping the intensities of the two characterized phonon modes of WS2, ... Full text Cite

Strain status in Fe- and Si- doped GaN epilayers grown on sapphire

Conference Optoelectronic Devices and Integration, OEDI 2015 · January 1, 2015 The effect of Fe doping on a series of Fe-doped GaN epilayers with difference doping concentrations were studied by Raman spectroscopy with comparison to Si-doped GaN samples. Compressive strain in Fe-dope GaN tend to relax. ... Full text Cite

Strain status in Fe- And Si- doped GaN epilayers grown on sapphire

Conference Photonics for Energy, PFE 2015 · January 1, 2015 The effect of Fe doping on a series of Fe-doped GaN epilayers with difference doping concentrations were studied by Raman spectroscopy with comparison to Si-doped GaN samples. Compressive strain in Fe-dope GaN tend to relax. ... Cite

Facile preparation of 2D sandwich-like CdS nanoparticles/nitrogen-doped reduced graphene oxide hybrid nanosheets with enhanced photoelectrochemical properties

Journal Article Journal of Materials Chemistry A · December 14, 2014 A facile surface-layer-absorption strategy was successfully integrated via a simple in situ sulfidation reaction route for the deposition of CdS nanoparticles on N-doped reduce graphene oxide (N-rGO) nanosheets to produce 2D sandwich-like CdS/N-rGO hybrid ... Full text Cite

Super transverse diffusion of minority carriers in GaxIn1-xP/GaAs double-junction tandem solar cells

Journal Article Solar Energy · December 1, 2014 In this work, remarkable transverse diffusion of minority carriers in the GaxIn1-xP top subcell of a GaxIn1-xP/GaAs double-junction tandem solar cell is revealed by the electroluminescence (EL) image surveying. As the forward bias is increased, the overall ... Full text Cite

Nature of red luminescence band in research-grade ZnO single crystals: A "self-activated" configurational transition

Journal Article Applied Physics Letters · July 28, 2014 By implanting Zn+ ions into research-grade intentionally undoped ZnO single crystal for facilitating Zn interstitials (Zni) and O vacancies (VO) which is revealed by precise X-Ray diffraction rocking curves, we observe an apparent broad red luminescence ba ... Full text Cite

Effects of Fe doping on the strain and optical properties of GaN epilayers grown on sapphire substrates

Journal Article RSC Advances · January 1, 2014 The effects of Fe doping on a series of Fe-doped GaN epilayers with different doping concentrations grown on sapphire substrates were investigated in detail by confocal micro-Raman spectroscopy under the back-scattering geometric configuration. Careful inv ... Full text Cite

Radiative recombination of carriers in the GaxIn 1-xP/GaAs double-junction tandem solar cells

Journal Article Solar Energy Materials and Solar Cells · January 31, 2013 Radiative recombination of carriers in two kinds of GaxIn 1-xP/GaAs double-junction tandem solar cell structures was investigated by using room-temperature electroluminescence (EL) and photoluminescence (PL) techniques. Efficient radiative recombination wa ... Full text Cite

Can interference patterns in the reflectance spectra of GaN epilayers give important information of carrier concentration?

Journal Article Applied Physics Letters · November 5, 2012 Low-temperature reflectance spectra of a series of Si-doped GaN epilayers with different doping concentrations grown on sapphire by metal-organic chemical vapour deposition were measured. In addition to the excitonic polariton resonance structures at the b ... Full text Cite

Temperature dependent distinct coupling and dispersions of heavy- and light-hole excitonic polaritons in ZnO

Journal Article Applied Physics Letters · May 28, 2012 Distinct coupling behavior of heavy- and light-hole excitonic polaritons in ZnO was unveiled by investigating the optical reflectance spectra of a high quality ZnO single crystal as a function of temperature both experimentally and theoretically. A resonan ... Full text Cite

Residual strains and optical properties of ZnO thin epilayers grown on r-sapphire planes

Journal Article Semiconductor Science and Technology · March 1, 2012 ZnO epilayers with a thickness of ∼360 nm were directly grown on r-sapphire planes at different temperatures (550, 500, 450 °C) with metal-organic chemical vapor deposition. Residual strains along the vertical direction and optical properties of the epilay ... Full text Cite

Formation dynamics of excitons and temporal behaviors of Fano resonance due to the exciton-impurity-phonon configuration interaction in ZnO.

Journal Article The journal of physical chemistry. A · January 2012 Formation dynamics of free and neutral donor bound excitons (FX and D(0)X) in a high quality ZnO single crystal are studied by means of time-resolved photoluminescence (TRPL) at various temperatures. At low-temperatures, FX and D(0)X formation times are de ... Full text Cite

Ion-implantation induced nano distortion layer and its influence on nonlinear optical properties of ZnO single crystals

Journal Article Journal of Applied Physics · October 15, 2011 Second harmonic generation (SHG) and X-ray diffraction rocking curves of high-quality ZnO single crystals implanted by different ions (He, Cu, and Zn) were investigated. Interestingly, it was found that both He- and Zn-implanted samples show a convinced in ... Full text Cite

Localized surface optical phonon mode in the InGaN/GaN multiple-quantum- wells nanopillars: Raman spectrum and imaging

Journal Article Applied Physics Letters · September 12, 2011 An interesting phonon mode at around 685-705 cm-1 was clearly observed in the Raman spectra of InGaN/GaN multiple-quantum-wells nanopillars with different diameters at room temperature. The Raman peak position of this mode is found to show a distinct depen ... Full text Cite

Inner surface enhanced femtosecond second harmonic generation in thin ZnO crystal tubes

Journal Article Journal of Applied Physics · January 1, 2011 At room temperature, efficient second harmonic generation (SHG) emission is observed in thin ZnO crystal hollow rods (tubes) with diameter∼0.2 mm under the excitation of femtosecond laser from 700 to 860 nm. Power and polarization dependence of the SHG sig ... Full text Cite

Optical properties of light-hole excitons in GaN epilayers

Journal Article Journal of Applied Physics · December 1, 2010 Optical properties of light-hole free exciton (FXB) in GaN epilayers were investigated by using near-resonance photoluminescence (PL) and time-resolved PL techniques. In contrast to the case of off-resonance PL where only heavy-hole free excitons (FXA) hav ... Full text Cite

Growth and characterization of ZnO single crystals with hydrous KOH melt method

Journal Article Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society · February 1, 2010 Transparent, brown-green and brown wurtzite zinc oxide (ZnO) single crystals were grown in silver, nickel and iron crucibles separately by the spontaneous nucleation method using hydrous KOH melt as flux. The analysis results of X-ray diffraction and induc ... Cite