Crystalline-phase depuration in Ce³⁺ activated Lu₃Al₅O₁₂-tellurite green-emitting phosphor-in-glass

Ce³⁺ activated Lu₃Al₅O₁₂ (LuAG) phosphor-in-glass (PiG) based on tellurite glass with low melting temperature has been synthesized and the LuAG particles are proved to be well-distributed in tellurite glass with the particle size of ~5 μm. The introduction of H₃BO₃ as a flux is helpful to promote polycrystalline growth and reduce reaction temperature of LuAG:Ce³⁺ green phosphor, but accompanied by the generation of LuBO₃ impurity phase. Differential fluorescence emission behaviors between LuAG:Ce³⁺ and LuAG-PiG illustrate that the luminous ability of the LuBO₃:Ce³⁺ is strongly restrained while intense pure green light is released in composite. LuAG-PiG combines the admirable formability of tellurite glass with the favorable luminescent capability of LuAG:Ce³⁺, in which LuBO₃ can be effectively eliminated to achieve LuAG:Ce³⁺ depuration. Prominent depuration capacity and intense fluorescence emission demonstrate that LuAG-PiG is a potential candidate in developing high-power light emitting diodes lighting.