Phosphorescent white organic light-emitting devices with color stability and low efficiency decay by using wide band-gap interlayer

Abstract

High-performance phosphorescent white organic light-emitting devices (PhWOLEDs) with color stability and low efficiency decay are demonstrated by inserting wide band-gap materials between emitting layers. The two devices with N,N′-dicarbazolyl-3,5-benzene (mCP) and p-bis(triphenylsilyl)benzene (UGH2) as the interlayer exhibit both slight Commission Internationale del’Eclairage (CIE) coordinates variations of (± 0.010, ± 0.005) and (± 0.013, ± 0.006) in a wide voltage range, and low decay in current efficiency which shifts from the peak value 35.4 cd·A⁻¹ and 27.4 cd·A⁻¹ to 28.8 cd·A⁻¹ and 23.5 cd·A⁻¹ at 40000 cd·m⁻², respectively. The improvements are attributed to the charge carriers balance and the elimination of energy transfer loss by confining the carrier accumulation at the exciton formation interface through the interlayer.

Keywords

Acac / External Quantum Efficiency / Apply Physic Letter / Color Stability / Yellow Emission

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This work has been supported by the National Natural Science Foundation of China (Nos.60736005 and 60425101-1), the Foundation for Innovation Groups of NSFC (No.61021061), the Fundamental Research Funds for the Central Universities (No.ZYGX2010Z004), the SRF for ROCS, SEM (No.GGRYJJ08-05), and the Doctoral Fund of Ministry of China (No.20090185110020).