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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.
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 + 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 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 LEDs.