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Proceedings Paper

Optoelectric properties in the phosphor-doped polymeric light-emitting diodes
Author(s): Je-Jung Yun; Gwang-Chae Oh; Su-Mi Park; Eun-Mi Han
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Paper Abstract

Bluish white light emission was obtained from a phospher doped light-emitting diodes(LEDs) prepared from a poly(9- vinylcarbazole)(PVK) matrix and an inorganic phosphor as a dopant. We used PVK as an emitter and long afterglow phosphor based on Strontium Aluminate as a guest emitter. The turn-on voltage of the phospher doped PVK LEDs is about 6.5 V, which was lower than the undoped PVK with a voltage of 12V. By doping with inorganic phosphor, the maximum luminescence is about much higher than that of the pure PVK LEDs. External quantum efficiency of the doped PVK LEDs was improved by two times compared to that of pure PVK LEDs. An additional emission observed in electrophosphorescence of the doped PVK LEDs at 630 nm is tentatively assigned to energy transfer from PVK to phospher.

Paper Details

Date Published: 6 June 2002
PDF: 8 pages
Proc. SPIE 4641, Light-Emitting Diodes: Research, Manufacturing, and Applications VI, (6 June 2002); doi: 10.1117/12.469211
Show Author Affiliations
Je-Jung Yun, Chonnam National Univ. (South Korea)
Gwang-Chae Oh, Chonnam National Univ. (South Korea)
Su-Mi Park, Chonnam National Univ. (South Korea)
Eun-Mi Han, Chonnam National Univ. (South Korea)

Published in SPIE Proceedings Vol. 4641:
Light-Emitting Diodes: Research, Manufacturing, and Applications VI
E. Fred Schubert; H. Walter Yao, Editor(s)

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