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

被引：11

作者：

Chondroudis, K ^{[1
]}

Mitzi, DB ^{[1
]}

机构：

[1] IBM Corp, Thomas J Watson Res Ctr, Yorktown Heights, NY 10598 USA

来源：

APPLIED PHYSICS LETTERS | 2000年 / 76卷 / 01期

关键词：

D O I：

10.1063/1.125655

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. (C) 2000 American Institute of Physics. [S0003-6951(00)01701-0].

引用

页码：58 / 60

页数：3

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