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Degradation in 1TMC OLEDs
Authors
,
H Bankowski
+15 more
S Bernhard
S Browne
H Concannon
M Damour
V Goldberg
S Green
E Hendrickson
HL Huan
MD Kaplan
V Liu
GG Malliaras
L Piirainen
S Reel
JD Slinker
LJ Soltzberg
Publication date
1 December 2008
Publisher
Abstract
The processes underlying degradation of organic light emitting diodes (OLEDs) are gradually becoming understood. In ruthenium-based ionic transition metal complex (iTMC) OLEDs, a dimeric species forms during device operation that quenches light emission [11. Water has been implicated in this degradation process [21. We report recent studies on degradation of OLEDs fabricated with fr(ppy)2(dtb-bpy)PF6 [ppy = 2-phenylpyridine, dtb-bpy = 4,4'-di-tert-butyl 2,2'- bipyridine [31. We have found that applying a thicker-than-usual metal electrode results in shorter turn-on times and higher light emission, though little improvement in lifetime. It appears that the degradation of these devices occurs by a different mechanism from that of the ruthenium-based devices and may involve local heating leading to chemical decomposition of the organic material. Observation of recurring but often transient dark-colored substances in both the Ru(bpy)3(PF6)2 and fr(ppy)2(dtb-bpy)PF6 systems, seen both in the solid state and in solution samples, may also be indicative of decomposition. © 2008 Materials Research Society
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Last time updated on 15/07/2020