The use of ionic salt dyes as amorphous, thermally stable emitting layers in organic light-emitting diodes


Journal Article

The conversion of two neutral dye molecules (D) to ionic salts (H2N-D-NH2·2HX) and their utilization as emitting layers in organic light-emitting diodes (OLEDs) is described. The dye salts, AEQT·2HCl and APT-2HCl, can be deposited as amorphous films using conventional evaporation techniques. X-ray diffraction and scanning electron microscopy analysis, coupled with thermal annealing studies, demonstrate the resistance of the films to crystallization. This stability is attributed to strong ionic forces between the relatively rigid molecules. OLEDs incorporating such salts for emitting layers exhibit better thermal stability compared with devices made from the corresponding neutral dyes (H2N-D-NH2). These results suggest that ionic salts may more generally enable the formation of thermally stable, amorphous emitting, and charge transporting layers. © 2000 American Institute of Physics.

Full Text

Duke Authors

Cited Authors

  • Chondroudis, K; Mitzi, DB

Published Date

  • January 3, 2000

Published In

Volume / Issue

  • 76 / 1

Start / End Page

  • 58 - 60

International Standard Serial Number (ISSN)

  • 0003-6951

Digital Object Identifier (DOI)

  • 10.1063/1.125655

Citation Source

  • Scopus