Novel Reddish-Orange-Emitting BaLa2Si2S8:Eu2+ Thiosilicate Phosphor for LED Lighting
2015
Lee, Szu-Ping | Chan, Ting-Shan | Chen, Teng-Ming
A novel reddish-orange-emitting BaLa₂Si₂S₈:Eu²⁺ thiosilicate was prepared in a sealed fused silica ampule and its crystal structure was refined using Rietveld methods. The BaLa₂Si₂S₈:Eu²⁺ phosphor is excitable over a broad range from UV to blue (350–450 nm) and generated a reddish-orange broadband emission peaking at 645 nm with a quantum efficiency of ∼24%. The thermal luminescence quenching of BaLa₂Si₂S₈:Eu²⁺ was investigated over the range 25 to 150 °C. This phosphor was utilized to incorporate with two commercially available phosphors, blue BaMgAl₁₀O₁₇:Eu²⁺ and green (Ba,Sr)₂SiO₄:Eu²⁺, and a near-UV LED chip (405 nm), a white light with Ra of ∼94 was obtained.
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