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A green-yellow emitting β-Sr2SiO4:Eu2+ phosphor for near ultraviolet chip white-light-emitting diode by Xiaoyuan SUN; Jiahua ZHANG; Xia ZHANG; Yongshi LUO; Xiaojun WANG is a Materials Science article available to read on EtoBox.

What is A green-yellow emitting β-Sr2SiO4:Eu2+ phosphor for near ultraviolet chip white-light-emitting diode about?

Sr 2 SiO 4 :xEu 2+ phosphors were synthesized through the solid-state reaction technique. The crystal phase of Sr 2 SiO 4 :xEu 2+ phosphor manipulated by Eu 2+ concentration was studied. The phase transited from β to α ́ in Sr 2 SiO 4 :xEu 2+ phosphor with increasing europium concentration. The single β phase was formed as x≤0.005 and changed α ́ phase when x>0.01. The emission spectrum of the β-Sr 2 SiO 4 :Eu 2+ phosphor consisted of a green-yellow broadband peaking at around 540 nm and a blue band at 470 nm under near ultraviolet excitation. The white LEDs by combining near ultraviolet chips with β-Sr 2 SiO 4 :Eu 2+ phosphors were fabricated. The luminous efficiency (15.7 lm/W) was higher than α ́-Sr 2 SiO 4 :Eu 2+ phosphor white LED.

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Author

Xiaoyuan SUN; Jiahua ZHANG; Xia ZHANG; Yongshi LUO; Xiaojun WANG

Publisher

Elsevier Science; Elsevier ; The Metallurgical Industry Press; Elsevier BV (ISSN 1002-0721)

Published

2008

Language

EN

Field

Materials Science (Physical Sciences)