6 June 2002 Optoelectric properties in the phosphor-doped polymeric light-emitting diodes
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Proceedings Volume 4641, Light-Emitting Diodes: Research, Manufacturing, and Applications VI; (2002) https://doi.org/10.1117/12.469211
Event: Symposium on Integrated Optoelectronic Devices, 2002, San Jose, California, United States
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.
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Je-Jung Yun, Gwang-Chae Oh, Su-Mi Park, Eun-Mi Han, "Optoelectric properties in the phosphor-doped polymeric light-emitting diodes", Proc. SPIE 4641, Light-Emitting Diodes: Research, Manufacturing, and Applications VI, (6 June 2002); doi: 10.1117/12.469211; https://doi.org/10.1117/12.469211
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