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Materials 2016, 9(5), 356; doi:10.3390/ma9050356

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

1
Institute of Microelectronics, Department of Electrical Engineering, Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan
2
Medical Devices and Opto-Electronics Equipment Department, Metal Industries Research and Development Center, Kaohsiung County 811, Taiwan
3
Graduate Institute of Materials Engineering, National Pingtung University of Science and Technology, Pingtung County 912, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Dinesh Agrawal
Received: 4 March 2016 / Revised: 22 April 2016 / Accepted: 4 May 2016 / Published: 12 May 2016
(This article belongs to the Special Issue Microwave Materials Processing)
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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. View Full-Text
Keywords: phosphors; LiBaPO4; microwave; luminescence phosphors; LiBaPO4; microwave; luminescence
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lai, H.-L.; Weng, M.-H.; Yang, R.-Y.; Chang, S.-J. Enhanced Photoluminescent Properties and Crystalline Morphology of LiBaPO4:Tm3+ Phosphor through Microwave Sintering Method. Materials 2016, 9, 356.

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