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

W.J. Park; M.K. Jung; Dae Ho Yoon

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

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HomeSolid State PhenomenaSolid State Phenomena Vols. 124-126Enhanced Luminescence Efficiency for Bi, Eu Doped...

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

Abstract:

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.

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Periodical:

Solid State Phenomena (Volumes 124-126)

Pages:

379-382

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.124-126.379

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Online since:

June 2007

Authors:

W.J. Park, M.K. Jung, Dae Ho Yoon

Keywords:

Co-Doping Activator, Optical Property, Red Phosphor, White LEDs, Yttrium Oxide

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