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Materials (Basel). 2016 May 12;9(5). pii: E356. doi: 10.3390/ma9050356.

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

Author information

1
Institute of Microelectronics, Department of Electrical Engineering, Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan. shiuannlin@hotmail.com.
2
Medical Devices and Opto-Electronics Equipment Department, Metal Industries Research and Development Center, Kaohsiung County 811, Taiwan. mhweng@mail.mirdc.org.tw.
3
Graduate Institute of Materials Engineering, National Pingtung University of Science and Technology, Pingtung County 912, Taiwan. ryyang@mail.npust.edu.tw.
4
Institute of Microelectronics, Department of Electrical Engineering, Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan. changsj@mail.ncku.edu.tw.

Abstract

An investigation of the photoluminescent properties and crystalline morphology of blue emitting LiBa1-xPO4:xTm3+ phosphors with various concentrations (x = 0.005-0.030) of Tm3+ ions were synthesized by microwave sintering. For comparison, the LiBa1-xPO4:xTm3+ 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 Tm3+ ion was x = 0.015, the luminescence intensity reached a maximum value, and then decreased with the increases of the Tm3+ concentration due to concentration quenching effect. The microwave sintering significantly enhanced the emission intensity of LiBa1-xPO4:xTm3+ phosphors. Additionally, the d-d interaction is the key mechanism of concentration quenching for LiBaPO₄:Tm3+. The chromaticity (x, y) for all LiBa1-xPO₄:xTm3+ phosphors are located at (0.16, 0.05), which will be classified as a blue region.

KEYWORDS:

LiBaPO4; luminescence; microwave; phosphors

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