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An investigation of the photoluminescent properties and crystalline morphology of blue emitting LiBa 1- x  PO4: x Tm 3+ phosphors with various concentrations ( x = 0.005-0.030) of Tm 3+ ions were synthesized by microwave sintering. For comparison, the LiBa 1- x  PO4: x Tm 3+ powders sintered at the same sintering condition but in a conventional furnace were also investigated. LiBaPO₄ without second phase was formed no matter which furnace was used. More uniform grain size distributions are obtained by microwave sintering. When the concentration of Tm 3+ ion was x = 0.015, the luminescence intensity reached a maximum value, and then decreased with the increases of the Tm 3+ concentration due to concentration quenching effect. The microwave sintering significantly enhanced the emission intensity of LiBa 1- x  PO4: x Tm 3+ phosphors. Additionally, the d-d interaction is the key mechanism of concentration quenching for LiBaPO₄:Tm 3+ . The chromaticity ( x , y ) for all LiBa 1- x  PO₄: x Tm 3+ phosphors are located at (0.16, 0.05), which will be classified as a blue region.

Enhanced Photoluminescent Properties and Crystalline Morphology of LiBaPO4:Tm3+ Phosphor through Microwave Sintering Method