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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 22 — Oct. 22, 2012
  • pp: 24411–24417

High efficiency blue phosphorescent organic light-emitting diodes with a multiple quantum well structure for reduced efficiency roll-off

Xiao Yang, Shaoqing Zhuang, Xianfeng Qiao, Guangyuan Mu, Lei Wang, Jiangshan Chen, and Dongge Ma  »View Author Affiliations


Optics Express, Vol. 20, Issue 22, pp. 24411-24417 (2012)
http://dx.doi.org/10.1364/OE.20.024411


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Abstract

Highly efficient blue phosphorescent organic light-emitting diodes (PhOLEDs) with a multiple quantum well (MQW) structure were investigated. A peak external quantum efficiency (EQE) of 20.31%, current efficiency of 40.31 cd/A and power efficiency of 30.14 lm/W were achieved in the optimized device with two quantum wells (QWs). The obtained efficiencies are much higher than those of the control devices without QWs. More importantly, the MQW devices exhibit low efficiency roll-off. At a high luminance of 5000 cd/m2, the EQE still keeps at a high value of 18.86% in the optimized MQW device, and the efficiency roll-off is only 7.14%, which is lower than that of 30.78% in the control device (reduced from 16.05% to 11.11%). Meanwhile, the maximum power efficiency of the optimized MQW device was also exhibited more than 54.80% improvement compared to the control device. The high efficiency and low efficiency roll-off are attributed to the effective confinement of charge carriers and excitons by the state-of-the-art MQWs.

© 2012 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.4170) Optical devices : Multilayers
(310.1860) Thin films : Deposition and fabrication

ToC Category:
Optical Devices

History
Original Manuscript: September 4, 2012
Revised Manuscript: October 6, 2012
Manuscript Accepted: October 8, 2012
Published: October 11, 2012

Citation
Xiao Yang, Shaoqing Zhuang, Xianfeng Qiao, Guangyuan Mu, Lei Wang, Jiangshan Chen, and Dongge Ma, "High efficiency blue phosphorescent organic light-emitting diodes with a multiple quantum well structure for reduced efficiency roll-off," Opt. Express 20, 24411-24417 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-22-24411


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