✦ LIBER ✦

Low molecular weight and polymeric triphenylenes as hole transport materials in organic two-layer LEDs

✍ Scribed by Andreas Bacher; Ingo Bleyl; Dr. Christian H. Erdelen; Prof. Dietrich Haarer; Dr. Wolfgang Paulus; Prof. Hans-Werner Schmidt

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 390 KB
Volume: 9
Category: Article
ISSN: 0935-9648
DOI: 10.1002/adma.19970091307

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✦ Synopsis

Communications

producf is found to dominate the photo-oxidation process on the !surface of thin films of PPV, especially for short exposure times. The occurrence of this species confined to the (near-)surface region of the films accounts for the fact that it is not seen in bulk IR studies.

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The use of low molecular weight, oligomeric and polymeric heterocyclics as electron transport/hole-blocking layers in organic light-emitting diodes is reviewed. The most widely applied materials are p-electron deficient heterocyclics carrying imine nitrogen atoms in the aromatic ring, such as 1,3,4-