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Proceedings Paper

White polymer light-emitting diodes with bilayer structure
Author(s): Yunhua Xu; Junbiao Peng; Yueqi Mo; Qiong Hou; Yong Cao
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Paper Abstract

White polymer light-emitting diodes (WPLEDs) with bilayer structure were fabricated by spin coating method. The device structure used here is ITO/PEDOT:PSS/blend1/blend2/Ba/Al, where blend1 consists of poly(N-vinylcarbazole) (PVK) and copolymer of 9,9-diotylfluorene and 4,7-di(3-hexyl-thien-2-yl)-2,1,3-benzothiadiazole (PFO-DHTBT), and blend2 is the blend of polyhedral oligomeric silsesquioxane-terminated poly(9,9-dioctylfluorene) (PFO-poss) and phenyl-substituted PPV derivative (P-PPV). The copolymer PFO-DHTBT emits red light. The blend2 gives off both green and blue emission bands in electroluminescence (EL) spectrum. the relative intensity of the bands depends on the blend ratios. The EL spectrum of the device can be controlled by respectively adjusting the weight ratios in the blend1 and blend2, thickness as well. At the weight ratios of 100:3 (PVK:PFO-DHTBT) in blend1 and 100:1 (PFO-poss: P-PPV) in blend2, and with keeping the thickness of the two blend films to be 40nm, the white fluorescent light emission with Commission International De L'Eclairage (CIE) coordinates of (0.33, 0.32) is achieved in a large voltage range, the maximal quantum and luminance efficiencies of 3% (ph/eh) and 4.4cd/A are obtained at 6.1V, and the maximal luminance is 6300cd/m2 at 10V.

Paper Details

Date Published: 12 January 2005
PDF: 6 pages
Proc. SPIE 5632, Light-Emitting Diode Materials and Devices, (12 January 2005); doi: 10.1117/12.588294
Show Author Affiliations
Yunhua Xu, South China Univ. of Technology (China)
Junbiao Peng, South China Univ. of Technology (China)
Yueqi Mo, South China Univ. of Technology (China)
Qiong Hou, South China Univ. of Technology (China)
Yong Cao, South China Univ. of Technology (China)


Published in SPIE Proceedings Vol. 5632:
Light-Emitting Diode Materials and Devices
Gang Yu; Chuangtian Chen; Changhee Lee, Editor(s)

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