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White Electroluminescent Devices Using Polymer Blends

Published online by Cambridge University Press:  15 February 2011

Do-Hoon Hwang
Affiliation:
Department of Applied Chemistry, Kumoh National Institute of Technology, Kumi 730-701, Korea(dhhwang@kumoh.ac.kr)
Jeong-Ik Lee
Affiliation:
Basic Research Lab., ETRI, Taejon 305-350, Korea 3Department of Physics, Inha University, Incheon 402-751, Korea
Chang-Hee Lee
Affiliation:
Basic Research Lab., ETRI, Taejon 305-350, Korea 3Department of Physics, Inha University, Incheon 402-751, Korea
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Abstract

White light-emitting devices were fabricated using the blends of blue, green, red emissive polymers of poly[9,9-(2'-ethylhexyl)fluorene] (PEHF), poly(9,9-dioctylfluorene-2,7-vinylene) (POFV), poly(2-(3',7'-dimethyloctyloxy)-5-methoxy-1,4-phenylene-1-cyanovinylene) (CNPPV) and poly(2-(2'-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene) (MEH-PPV). Inefficient energy transfers between the blue polymer and the green or the red polymer, which was observed in PL spectra of the blend films, provides a good opportunity to get white light emission due to better blend ratio controllability. The EL devices were fabricated with ITO/PEDOT/blend/Ca/Al configuration and good white light-emission was obtained for a certain blend ratio. The light-emission was observable from 4V and a maximum brightness of 400 cd/m2 was obtained with the device.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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