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http://dx.doi.org/10.4313/JKEM.2004.17.11.1192

Studies on the Energy Transfer in LED Containing the Layer made of the Blends of Hole Transporting Polymer and Organic Phosphorescent Dye  

Kim, Eugene (홍익대학교 디스플레이전자공학대학원, 기초과학과)
Jung, Sook (홍익대학교 디스플레이전자공학대학원, 기초과학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.17, no.11, 2004 , pp. 1192-1198 More about this Journal
Abstract
Hole transporting polymer(poly［N-(p-diphenylamine)phenylmethacrylamide］, PDPMA) was doped with nile red dye at various concentrations to study the influence of doping on the energy transfer during light emitting processes. Organic LEDs composed of ITO/blend(PDPMA -nile red)/ Alq$_3$/Al as well as thin films of blend(PDPMA -nile red)/ Alq$_3$ were manufactured for investigating photoluminescence, electroluminescence, and current-voltage characteristics. Atomic Force Microscopy was also used to observe surface morphology of the blend films. It was found that such doping. significantly influences the efficiency of the energy transfer from the Alq$_3$ layer to blended layer and the optical/electrical properties could be optimized by choosing the right concentration of the dye molecule. The results also showed a interesting correlation with the morphological aspect, i.e. the optimum luminescence at the concentration with the least surface roughness. When the concentration of nile red was 0.8 wt%, the maximum energy transfer could be achieved.
Keywords
Electroluminescence; Hole transporting polymer; Atomic force microscopy;
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