TITLE

Efficient organic light-emitting diodes with undoped active layers based on silole derivatives

AUTHOR(S)
Murata, Hideyuki; Kafafi, Zakya H.; Uchida, Manabu
PUB. DATE
January 2002
SOURCE
Applied Physics Letters;1/14/2002, Vol. 80 Issue 2, p189
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on efficient molecular organic light-emitting diodes (MOLEDs) composed of novel silole derivatives as an electron transporting layer and an emissive layer. The silole derivative, 2,5-bis(2[sup ′],2[sup ″]-bipyridin-6-yl)-1,1-dimethyl-3,4-diphenylsilacyclopentadiene, used for the electron transport layer exhibits fast electron mobility of 2×10[sup -4] cm[sup 2]/V s at 0.64 MV/cm measured by the time-of-flight technique. Another silole derivative, 1,2-bis(1-methyl-2,3,4,5-tetraphenyl silacyclopentadienyl)ethane, used for an emissive layer exhibits blue-green fluorescence with an absolute quantum yield of 97±3% in the solid state. The devices using silole derivatives show a very low operating voltage, an external electroluminescence quantum efficiency (η[sub EL]) of 4.8 %, and luminous power efficiency of 9 lm/W at a brightness of 100 cd/m[sup 2]. This value of η[sub EL] is the best efficiency achieved for MOLED using undoped emissive and carrier transport layers and is close to the theoretical limit for a device using a fluorescent emitter. © 2002 American Institute of Physics.
ACCESSION #
5845130

 

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