Syntheses and Characterizations of New Eu-Ce Codoped LaSrSiO3N Phosphors for LEDs

D.C. Huang; You Fu Zhou; Chao Quan; Wen Tao Xu

doi:10.4028/www.scientific.net/KEM.697.80

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 697Syntheses and Characterizations of New Eu-Ce...

Syntheses and Characterizations of New Eu-Ce Codoped LaSrSiO₃N Phosphors for LEDs

Abstract:

New luminescent oxynitridosilicates doped with Eu²⁺ and Ce³⁺ have been synthesized by solid state reaction method at 1450oC. The host has the general formula La₁_-_ySr₁_-_xSiO₃N: (yCe³⁺, xEu²⁺), which presents greenish-yellow or orange photoluminescence under UV/blue excitation. Remarkable long wavelength emissions centered above 565 nm were observed for the Ce³⁺ activated oxynitridosilicates, with compositions LaSrSiO₃N:0.02Ce³⁺, and LaSrSiO₃N:(0.02Ce³⁺, 0.02Eu²⁺) for 598 nm due to a significant amount of energy transfer from Ce³⁺ ions to Eu²⁺ions. By combining the title LaSrSiO₃N:(Ce³⁺, Eu²⁺) phosphors with the 450 nm InGaN chip, a broad range of white light with correlated color temperatures of ~3500 K and color-rendering index of 92 can be generated, demonstrating their promising practical applicability to the warm-white light-emitting diodes.

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Key Engineering Materials (Volume 697)

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80-83

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.697.80

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Online since:

July 2016

Authors:

D.C. Huang, You Fu Zhou*, Chao Quan, Wen Tao Xu

Keywords:

Oxynitridosilicate, Phosphor, Photoluminescence, White LEDs

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