Issue 35, 2007

Silane- and triazine-containing hole and exciton blocking material for high-efficiency phosphorescent organic light emitting diodes

Abstract

One of the important factors for high efficiency phosphorescent organic light-emitting devices is to confine triplet excitons within the emitting layer. We synthesized and characterized a new hole blocking material containing silane and triazine moieties, 2,4-diphenyl-6-(4′-triphenylsilanyl-biphenyl-4-yl)-1,3,5-triazine (DTBT). Electrophosphorescent devices fabricated using the material as the hole-blocking layer and N,N′-dicarbazolyl-4,4′-biphenyl (CBP) doped with fac-tris(2-phenylpyridine)iridium [Ir(ppy)3] as the emitting layer showed a maximum external quantum efficiency (ηext) of 17.5% with a maximum power efficiency (ηp) of 47.8 lm W−1, which are much higher than those of devices using bathcuproine (BCP) (ηext = 14.5%, ηp = 40.0 lm W−1) and 4-biphenyloxolate aluminium(III) bis(2-methyl-8-quinolinato)-4-phenylphenolate (BAlq) (ηext = 8.1%, ηp = 14.2 lm W−1) as hole-blocking layers.

Graphical abstract: Silane- and triazine-containing hole and exciton blocking material for high-efficiency phosphorescent organic light emitting diodes

Supplementary files

Article information

Article type
Paper
Submitted
16 Apr 2007
Accepted
20 Jun 2007
First published
05 Jul 2007

J. Mater. Chem., 2007,17, 3714-3719

Silane- and triazine-containing hole and exciton blocking material for high-efficiency phosphorescent organic light emitting diodes

J. Kang, D. Lee, H. Park, Y. Park, J. W. Kim, W. Jeong, K. Yoo, K. Go, S. Kim and J. Kim, J. Mater. Chem., 2007, 17, 3714 DOI: 10.1039/B705741E

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