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

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

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

Sr2SiO4:xEu2+ phosphors were synthesized through the solid-state reaction technique. The crystal phase of Sr2SiO4:xEu2+ phosphor manipulated by Eu2+ concentration was studied. The phase transited from β to α' in Sr2SiO4:xEu2+ 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-Sr2SiO4:Eu2+ 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-Sr2SiO4:Eu2+ phosphors were fabricated. The luminous efficiency (15.7 lm/W) was higher than α'-Sr2SiO4:Eu2+ phosphor white LED.

Original languageEnglish
Pages (from-to)421-424
Number of pages4
JournalJournal of Rare Earths
Volume26
Issue number3
DOIs
StatePublished - Jun 2008

Scopus Subject Areas

  • General Chemistry
  • Geochemistry and Petrology

Keywords

  • light-emitting diode
  • luminescence
  • rare earths
  • silicate

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