Improved efficiency in top-emitting OLEDs with p-type Si anode

Yong-bo Yuan; Shu-ming Chen; Jia-rong Lian; Ze-feng Xie; Xiang Zhou

doi:10.1117/12.755833

20 November 2007 Improved efficiency in top-emitting OLEDs with p-type Si anode

Yong-bo Yuan, Shu-ming Chen, Jia-rong Lian, Ze-feng Xie, Xiang Zhou

Proceedings Volume 6828, Light-Emitting Diode Materials and Devices II; 68280P (2007) https://doi.org/10.1117/12.755833
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

We report improved efficiency in Alq based top-emitting OLEDs with p-Si anode by using an effective electron injection layer and a hole blocking layer to realize better charge balance and recombination. With structure of p-Si/SiO₂/MoO₃ (2 nm)/NPB (40 nm)/Alq (40 nm)/TPBI (10 nm)/Cs₂CO₃ (2 nm)/Ag (20 nm)/Alq (40 nm), where the 40 nm Alq capping layer on top Ag cathode was used to improve out-coupling efficiency, the devices show a turn on voltage of 5.5 V and a driving voltage of 10 V for 100 cd/m² with a maximum efficiency of exceeding 1.2 cd/A and a maximum power efficiency of 0.4 lm/W, which are comparable with the conventional OLEDs and encouraging and promising for Si based OLEDs and optoelectronics.

Citation Download Citation

Yong-bo Yuan, Shu-ming Chen, Jia-rong Lian, Ze-feng Xie, and Xiang Zhou "Improved efficiency in top-emitting OLEDs with p-type Si anode", Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 68280P (20 November 2007); https://doi.org/10.1117/12.755833

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