Environmental stability of aluminum tris(8-hydroxyquinoline) (Alq(3)) and its implications in light emitting devices

被引：55

作者：

Papadimitrakopoulos, F

Zhang, XM

机构：

[1] Department of Chemistry, Wesleyan University, Middletown

[2] Department of Chemistry, Institute of Materials Science, University of Connecticut, Storrs

来源：

SYNTHETIC METALS | 1997年 / 85卷 / 1-3期

关键词：

aluminum tris(8-hydroxyquinoline) (Alq(3)); light emitting diodes; GC/MS; failure mechanisms;

D O I：

10.1016/S0379-6779(97)80214-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The thermal stability of the aluminum tris(8-hydroxyquinoline) (Alq(3)) is currently discussed, in light of its vital role in failure mechanisms of molecular-based light emitting diodes (LEDs). This was investigated with the use of gas chromatography/mass spectroscopy (GC/MS), assisted by a specialized accessory that permits heating of powders or thin films of Alq(3) under a controlled environment. We have shown that at elevated temperatures, Alq(3) undergoes a ligand exchange reaction with water, which readily adsorbs on its surface. The increased sensitivity of CC/MS in detecting the liberated 8-hydroxyquinoline (8-Hq) indicates that Alq(3) is extremely sensitive to the moisture above 90 degrees C. The surface of a freshly sublimed Alq(3) powder or film becomes saturated with water in less than 2 minutes, under normal laboratory conditions. The implications of the underlying chemistry are discussed in relation to failure mechanisms observed in Alq(3) based LEDs.

引用

页码：1221 / 1224

页数：4

共 25 条

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