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An ambipolar phosphine oxide-based host for high power efficiency blue phosphorescent organic light emitting devices

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5 Author(s)
Polikarpov, Evgueni ; Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA ; Swensen, James S. ; Chopra, Neetu ; So, F.
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We report blue electrophosphorescent organic light emitting devices with an ambipolar host material, 4-(diphenylphosphoryl)-N,N-diphenylaniline (HM-A1), doped with FIrpic (iridium (III)bis[(4,6-difluorophenyl)-pyridinato-N,C2]picolinate). The ambipolar nature of the host was verified using single carrier devices. The power efficiency of devices with PO15 (2,8-bis(diphenylphosphoryl)dibenzothiophene) electron transport layer (ETL) showed optimized performance when the ETL thickness was 500 Å, giving a peak power efficiency of 46 lm/W (corresponding external quantum efficiency (EQE) of 17.1%). The EQE and power efficiency at the brightness of 800 cd/m2 were measured with no light outcoupling enhancement and found to be 15.4% and 26 lm/W, respectively.

Published in:

Applied Physics Letters  (Volume:94 ,  Issue: 22 )

Date of Publication:

Jun 2009

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