An investigation of the photoluminescent properties and crystalline morphology of blue emitting LiBaPO4:Tm phosphors with various concentrations ( = 0.005-0.030) of Tm ions were synthesized by microwave sintering. For comparison, the LiBaPO4:Tm 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 ion was = 0.015, the luminescence intensity reached a maximum value, and then decreased with the increases of the Tm concentration due to concentration quenching effect. The microwave sintering significantly enhanced the emission intensity of LiBaPO4:Tm phosphors. Additionally, the d-d interaction is the key mechanism of concentration quenching for LiBaPO₄:Tm. The chromaticity (, ) for all LiBaPO₄:Tm phosphors are located at (0.16, 0.05), which will be classified as a blue region.
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| http://dx.doi.org/10.3390/ma9050356 | DOI Listing |
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