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Energy Express

  • Editor: Christian Seassal
  • Vol. 21, Iss. S1 — Jan. 14, 2013
  • pp: A173–A178

High color rending index and high-efficiency white organic light-emitting diodes based on the control of red phosphorescent dye-doped hole transport layer

M. Y. Zhang, F. F. Wang, N. Wei, P. C. Zhou, K. J. Peng, J. N. Yu, Z. X. Wang, and B. Wei  »View Author Affiliations

Optics Express, Vol. 21, Issue S1, pp. A173-A178 (2013)

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We have investigated the transport characteristics of red phosphorescent dye bis(1-(phenyl)isoquinoline) iridium (III) acetylanetonate (Ir(piq)2acac) doped 4,4’,4”-tri(N-carbazolyl)triphenylamine (TCTA), and found that the increasing doping ratio was facilitated to improve the ability of hole transporting. A high color rendering index (CRI) and high-efficiency WOLED was achieved by employing Ir(piq)2acac doped TCTA film as an effective red emissive layer due to the generation of charge transfer complex (CTC) at the interface. The relative proportion in red: green: blue emission intensity can be controlled by the CTC concentration to obtain high CRI WOLEDs. The WOLED with an optimal red dye doping concentration of 5 wt% exhibits a high CRI of 89 and a power efficiency of 31.2 lm/W and 27.5 lm/W at the initial luminance and 100 cd/m2, respectively. The devices show little variation of the Commission Internationale de I’Eclairage coordinates in a wide range of luminance.

© 2012 OSA

OCIS Codes
(160.4670) Materials : Optical materials
(230.3670) Optical devices : Light-emitting diodes
(310.6860) Thin films : Thin films, optical properties
(330.1715) Vision, color, and visual optics : Color, rendering and metamerism

ToC Category:
Light-Emitting Diodes

Original Manuscript: July 26, 2012
Revised Manuscript: October 17, 2012
Manuscript Accepted: October 17, 2012
Published: December 21, 2012

M. Y. Zhang, F. F. Wang, N. Wei, P. C. Zhou, K. J. Peng, J. N. Yu, Z. X. Wang, and B. Wei, "High color rending index and high-efficiency white organic light-emitting diodes based on the control of red phosphorescent dye-doped hole transport layer," Opt. Express 21, A173-A178 (2013)

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