White organic light-emitting diodes based on electroplex from polyvinyl carbazole and carbazole oligomers blends

doi:10.1088/1674-1056/19/3/037801

Abstract White organic light-emitting diodes with a blue emitting material fluorene-centred ethylene-liked carbazole oligomer (Cz6F) doped into polyvinyl carbazole (PVK) as the single light-emitting layer are reported. The optical properties of Cz6F, PVK, and PVK:Cz6F blends are studied. Single and double layer devices are fabricated by using PVK: Cz6F blends, and the device with the configuration of indium tin oxide (ITO)/PVK:Cz6F/ tris(8-hydroxyquinolinate)aluminium (Alq₃)/LiF/Al exhibits white light emission with Commission Internationale de l'éclairage chromaticity coordinates of (0.30, 0.33) and a brightness of 402 cd/m². The investigation reveals that the white light is composed of a blue--green emission originating from the excimer of Cz6F molecules and a red emission from an electroplex from the PVK:Cz6F blend films.

Keywords: white organic light-emitting diodes electroluminescence electroplex

Received: 17 May 2009
Revised: 22 September 2009
Accepted manuscript online:

PACS:	85.60.Jb	(Light-emitting devices)
	78.66.Qn	(Polymers; organic compounds)
	85.60.Bt	(Optoelectronic device characterization, design, and modeling)

Fund: Project supported by the National Basic Research Program of China (Grant No.~2009CB623605), the National Natural Science Foundation of China (Grant No.~50673035), Program for New Century Excellent Talents in Universities of Ministry of Education, the 111 Project (Grant No.~B06009).

Cite this article:

Chen Fei-Peng(陈飞鹏), Xu Bin(徐斌), Zhao Zu-Jin(赵祖金), Tian Wen-Jing (田文晶), LÜ Ping(吕萍), and Im Chan White organic light-emitting diodes based on electroplex from polyvinyl carbazole and carbazole oligomers blends 2010 Chin. Phys. B 19 037801

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White organic light-emitting diodes based on electroplex from polyvinyl carbazole and carbazole oligomers blends

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