Studies of blue organic electroluminescent devices using the polymer/dopant systems as a light-emitting layer

Fu-Chiao Wu; Horng-Long Cheng; Wei-Yang Chou

doi:10.1117/12.733735

16 October 2007 Studies of blue organic electroluminescent devices using the polymer/dopant systems as a light-emitting layer

Fu-Chiao Wu, Horng-Long Cheng, Wei-Yang Chou

Author Affiliations +

Proceedings Volume 6655, Organic Light Emitting Materials and Devices XI; 66551P (2007) https://doi.org/10.1117/12.733735
Event: Photonic Devices + Applications, 2007, San Diego, California, United States

Abstract

In this study, blue organic light-emitting diodes (OLEDs) using polymer-dopant systems as a light-emitting layer were fabricated. The light-emitting layer was produced via a spin-coating process. The materials used in the light-emitting layer included: poly(9-vinylcarbazole) (PVK) as a matrix material, and blue-emission 4,4'-bis(2,2-diphenylvinyl)biphenyl (DPVBi) as a light-emitting material. The blue OLED was fabricated by blending PVK and DPVBi according to the proportion of mass as specified for a light-emitting layer. Process relevant photophysical mechanisms and energy transfer phenomena were studied using absorption, photoluminescence (PL), photoluminescent excitation, and electroluminescence (EL) spectra. We have learned that there was energy transfer phenomenon between PVK and DPVBi. More specifically, the EL spectrum of PVK:DPVBi was significantly different from the PL spectra of PVK, DPVBi, and PVK:DPVBi, shifting to a longer wavelength and showing multiple boarding emission peaks (maximum emission at 465 and 486 nm). The electro-optical characteristics of the blue OLED and the possible origin of the difference between the EL and PL spectra were discussed.

Citation Download Citation

Fu-Chiao Wu, Horng-Long Cheng, and Wei-Yang Chou "Studies of blue organic electroluminescent devices using the polymer/dopant systems as a light-emitting layer", Proc. SPIE 6655, Organic Light Emitting Materials and Devices XI, 66551P (16 October 2007); https://doi.org/10.1117/12.733735

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