首页|Enhanced Brightness and Efficiency in Single-Layer White Polymer Light-Emitting Diodes (PLEDs)

Enhanced Brightness and Efficiency in Single-Layer White Polymer Light-Emitting Diodes (PLEDs)

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  • NETL
  • NSTL
  • Trans Tech Publications Ltd
In this paper, the improvements in luminance and efficiency have been demonstrated in a white polymer light-emitting device (PLED) with the structure of ITO/ poly (N-vinylcarbazole) (PVK): 1,1,4,4-tetraphenyl-1,3 -butadiene (TPB):5,6,11,12-tetrapheny lanpthacene (rubrene) /LiF(l nm)/Ca(10 nm)/Al(100 nm). The luminance of the white PLED is up to 4940 cd/m~2 at 17 V. The current efficiency and Commission Internationale d'Eclairage (CIE) coordinates is 1.66 cd/A and (0.325, 0.326), respectively. The enhancement of the luminance and efficiency can be attributed to an improved hole-injection ability and balance carrier recombination through two ways: (1) enhancing the hole-injection from ITO by using O_2 plasma treatment, and (2) balance the recombination of hole and electron by produce a buffer layer with σ-bonded segments of polymer between the ITO and the polymer layer. Besides, orange-emitting rubrene provides that direct recombination of holes and electrons occurred on the dopant molecules and trapping significantly enhanced the luminance and efficiency.

polymer light-emitting deviceelectroluminescent

Dei-Wei Chou、Kan-Lin Chen、Chien-Jung Huang、Chem-Hwa Chen、Wen-Ray Chen、Teen-Hang Meen、Ke-Shiang Shiau

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Department of Aviation & Communication Electronics, Air Force Institute of Technology, Kaohsiung, Taiwan

Department of Electronic Engineering, Fortune Institute of Technology, Kaohsiung, Taiwan

Department of Applied Physics, National University of Kaohsiung, #700 Kaohsiung University Rd., Kaohsiung, Taiwan

Department of Civil and Environmental Engineering, National University of Kaohsiung, #700 Kaohsiung University Rd., Kaohsiung, Taiwan

Department of Electronic Engineering, National Formosa University, Hu-Wei, Yunlin, Taiwan

Department of Electrical Engineering, Southern Taiwan University of Technology, Tainan, Taiwan 701

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2010

10.4028/www.scientific.net/KEM.434-435.429

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.434/435
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