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A novel blue-emitting phosphor LiSrPO4:Eu2+ for white LEDs

✍ Scribed by Z.C. Wu; J.X. Shi; J. Wang; M.L. Gong; Q. Su

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
172 KB
Volume
179
Category
Article
ISSN
0022-4596

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✦ Synopsis

A novel blue-emitting phosphor, LiSrPO 4 :Eu 2+ , was prepared by the solid-state reaction and X-ray powder diffraction (XRD) analysis confirmed the formation of LiSrPO 4 :Eu 2+ . Photoluminescence (PL) results showed that the phosphor can be efficiently excited by UV-visible light from 250 to 440 nm, and exhibited bright blue emission. The effects of the doped-Eu 2+ concentration in LiSrPO 4 :Eu 2+ on the PL were investigated in detail. The results showed that the relative PL intensity increases with Eu 2+ -concentration increasing until a maximum intensity is reached, and then it decreases due to concentration quenching and a red-shift appears, which are explained satisfactorily with the luminescent theory. Upon excited with 396 nm light, the present synthesized phosphor has higher emission intensity than that from the commercial blue phosphor, BaMgAl 10 O 17 :Eu 2+ . Bright blue light-emitting diodes were fabricated by the combination of the synthesized LiSrPO 4 :Eu 2+ with $397 nm emitting InGaN-based chips.

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