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  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 24 — Dec. 15, 2007
  • pp: 3537–3539

Lighting object-based nondoped-type white organic light-emitting diode with N , N -diphenyl- N , N -bis(1-naphthyl)-(1, 1 -benzidine)-4, 4 -diamine as the chromaticity-tuning layer

Jianzhuo Zhu, Wenlian Li, Zisheng Su, Bei Chu, Liangliang Han, Dongfang Yang, Defeng Bi, Bin Li, Zhizhi Hu, Zhiqiang Zhang, and Taiju Tsuboi  »View Author Affiliations


Optics Letters, Vol. 32, Issue 24, pp. 3537-3539 (2007)
http://dx.doi.org/10.1364/OL.32.003537


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Abstract

We demonstrate a nondoped white organic light-emitting diode in which the blue, green, and red emissions are generated from 4 , 4 -bis( 2 , 2 -diphenylvinyl)- 1 , 1 -biphenyl, tris(8-hydroxyquinoline)aluminum, and a submonolayer of 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7- tetramethyl-julolidyl 9-enyl)-4H-pyran layers, respectively. A thin layer of N , N -diphenyl- N , N -bis(1-naphthyl)(1, 1 -benzidine)-4, 4 -diamine (NPB), which differed from the traditional hole-transporting layer, was introduced into the device. The thickness of this thin NPB layer was changed to tune the chromaticity and optimize the white color quality. The white device with a 3 nm chromaticity-tuning NPB layer gives the Commission Internationale de l’Eclairage-1931 x y coordinate of (0.327, 0.336), a color rendering index of 90.2, a maximum luminance of 19,096 cd m 2 , and a maximum current efficiency of 4.12 cd A . The electroluminescence mechanism of the white device was also discussed.

© 2007 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(260.3800) Physical optics : Luminescence

ToC Category:
Optical Devices

History
Original Manuscript: June 11, 2007
Revised Manuscript: November 5, 2007
Manuscript Accepted: November 14, 2007
Published: December 11, 2007

Citation
Jianzhuo Zhu, Wenlian Li, Zisheng Su, Bei Chu, Liangliang Han, Dongfang Yang, Defeng Bi, Bin Li, Zhizhi Hu, Zhiqiang Zhang, and Taiju Tsuboi, "Lighting object-based nondoped-type white organic light-emitting diode with N,N-diphenyl-N,N-bis(1-naphthyl)-(1,1-benzidine)-4,4-diamine as the chromaticity-tuning layer," Opt. Lett. 32, 3537-3539 (2007)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-32-24-3537


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