Enhanced Luminescence Efficiency for Bi, Eu Doped Y2O3 Red Phosphors for White LEDs

Abstract:

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Bi and Eu co-doped Y2O3 was used as a red phosphor with a very high efficiency synthesized by the solid state reaction and co-precipitation The emission spectrum consisted of a weak band at 581, 587, 593 and 599 nm corresponding to the 5D0 → 7F1 transition, with sharp peaks of maximum intensity occurring at about 611 nm due to the 5D0 → 7F2 transition of Eu3+. In addition, the excitation spectrum exhibited a broad band between 250 and 550 nm with peaks occurring at about 310 – 400 nm and a sharp peak at 465.5 nm. The relative emission intensity was improved by co-precipitation synthesis as compared to solid state reaction synthesis. This implies that an appropriate co-precipitation synthesis could improve the luminescent efficiency, particularly for the samples prepared with the optimized firing temperature of 1100 °C.

Info:

Periodical:

Solid State Phenomena (Volumes 124-126)

Edited by:

Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park

Pages:

379-382

DOI:

10.4028/www.scientific.net/SSP.124-126.379

Citation:

W.J. Park et al., "Enhanced Luminescence Efficiency for Bi, Eu Doped Y2O3 Red Phosphors for White LEDs", Solid State Phenomena, Vols. 124-126, pp. 379-382, 2007

Online since:

June 2007

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Price:

$35.00

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