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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 14 — Jul. 15, 2013
  • pp: 17020–17027

Improving working lifetime and efficiency of phosphor doped organic light-emitting diodes

Yunfei Li, Yuying Hao, Wenlian Li, Shuqing Yuan, Huihui Liu, Yanxia Cui, Hua Wang, Bingshe Xu, and Wei Huang  »View Author Affiliations


Optics Express, Vol. 21, Issue 14, pp. 17020-17027 (2013)
http://dx.doi.org/10.1364/OE.21.017020


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Abstract

Long working lifetime and high efficient phosphorescent organic light-emitting diode (PHOLED) in which mixed host composed of wide-band-gap based 4, 7-diphenyl-1, 10-phenanthroline (Bphen) and (4,4’-bis(carbazol-9-yl)-biphenyl) (CBP) was demonstrated. The PHOLED with structure of ITO / MoO3 / CBP:MoO3 (15v%, 30 nm) / CBP(10 nm) / ([50v%:50v% CBP:Bphen]: 6v% Ir(ppy)3)(30 nm) / Bphen (40 nm) / LiF (1 nm) / Al offers a peak power efficiency of 41.6 lm/W (a peak current efficiency of 39.8 cd/A)) at a low driving voltage of 3 V which increases by 55% and 27% compared to that of corresponding single-host (SH) and double emitting layer (DML) devices, respectively. Especially very long work lifetime (3530 hs) at an initial luminance of 500 cd/m2 of the mixed hosted device is exhibited, rising by about 4.1 and 2.46 times relative to that of corresponding SH and DML devices. High efficiency and longer working lifetime was attributed to the absence of heterojunction and balanced charge carrier transport characteristics in the mixed host based OLED structure. The more detail mechanism was also presented.

© 2013 OSA

OCIS Codes
(160.4760) Materials : Optical properties
(160.4890) Materials : Organic materials
(230.3670) Optical devices : Light-emitting diodes
(310.6870) Thin films : Thin films, other properties

ToC Category:
Optical Devices

History
Original Manuscript: March 11, 2013
Revised Manuscript: May 4, 2013
Manuscript Accepted: June 26, 2013
Published: July 10, 2013

Citation
Yunfei Li, Yuying Hao, Wenlian Li, Shuqing Yuan, Huihui Liu, Yanxia Cui, Hua Wang, Bingshe Xu, and Wei Huang, "Improving working lifetime and efficiency of phosphor doped organic light-emitting diodes," Opt. Express 21, 17020-17027 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-14-17020


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