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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 38, Iss. 14 — Jul. 15, 2013
  • pp: 2373–2375

Efficient red organic electroluminescent devices by doping platinum(II) Schiff base emitter into two host materials with stepwise energy levels

Liang Zhou, Chi-Chung Kwok, Gang Cheng, Hongjie Zhang, and Chi-Ming Che  »View Author Affiliations


Optics Letters, Vol. 38, Issue 14, pp. 2373-2375 (2013)
http://dx.doi.org/10.1364/OL.38.002373


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Abstract

In this work, organic electroluminescent (EL) devices with double light-emitting layers (EMLs) having stepwise energy levels were designed to improve the EL performance of a red-light-emitting platinum(II) Schiff base complex. A series of devices with single or double EML(s) were fabricated and characterized. Compared with single-EML devices, double-EML devices showed improved EL efficiency and brightness, attributed to better balance in carriers. In addition, the stepwise distribution in energy levels of host materials is instrumental in broadening the recombination zone, thus delaying the roll-off of EL efficiency. The highest EL current efficiency and power efficiency of 17.36cd/A and 14.73lm/W, respectively, were achieved with the optimized double-EML devices. At high brightness of 1000cd/m2, EL efficiency as high as 8.89cd/A was retained.

© 2013 Optical Society of America

OCIS Codes
(160.6990) Materials : Transition-metal-doped materials
(230.3670) Optical devices : Light-emitting diodes
(310.6845) Thin films : Thin film devices and applications

ToC Category:
Materials

History
Original Manuscript: March 28, 2013
Revised Manuscript: June 1, 2013
Manuscript Accepted: June 6, 2013
Published: July 3, 2013

Citation
Liang Zhou, Chi-Chung Kwok, Gang Cheng, Hongjie Zhang, and Chi-Ming Che, "Efficient red organic electroluminescent devices by doping platinum(II) Schiff base emitter into two host materials with stepwise energy levels," Opt. Lett. 38, 2373-2375 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-14-2373


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