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 language | English |
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Pages (from-to) | 421-424 |
Number of pages | 4 |
Journal | Journal of Rare Earths |
Volume | 26 |
Issue number | 3 |
DOIs | |
State | Published - Jun 2008 |
Scopus Subject Areas
- General Chemistry
- Geochemistry and Petrology
Keywords
- light-emitting diode
- luminescence
- rare earths
- silicate