High-brightness white light-emitting organic electroluminescent devices using poly(N-vinylcarbazole) as a hole-transporter |
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| Authors: | J.S. Huang K.X. Yang Z.Y. Xie S.Y. Liu H.J. Jiang |
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| Affiliation: | (1) National Laboratory of Integrated Optoelectronics, Jilin University, Changchun, 130023, P.R. China;(2) Photonics Research Group, School of Electrical & Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore, 639798 |
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| Abstract: | A white light-emitting organic electroluminescent (EL) device with multilayer thin-film structure, which shows high-brightness and high-efficiency, is demonstrated. The device structure of glass substrate/indium–tin oxide/poly(N-vinylcarbazole) (PVK)/1,1,4,4-tetraphenyl-1,3-butadiene/8-(quinolinolate)-aluminum (Alq) doped with 5,6,11,12-tetraphenylnaphthacene/Alq/Mg/Al was employed. The turn-on voltage is as low as 2.5 V. The white light emission covers a wide range of the visible region, and the Commission Internationale de 1' Eclairage coordinates of the emitted light are (0.319, 0.332) at 10 V. Bright white light, over 20 000 cd/m2, was successfully obtained at about 18 V, and the maximum efficiency reaches to 1.24 lm/W at 9 V. The reasons of obtaining high level EL properties of our device have been discussed. |
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| Keywords: | organic white light electroluminescence |
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