White-light generation through Ce3+/Mn2+-codoped and Eu2+-doped Ba1.2Ca0.8SiO4 T-phase phosphors |
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| Authors: | Kwangwon Park Jaebum Lee Jehong Park Jongsu Kim Patrick Kung Seongsin M Kim Gawngchul Kim |
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| Institution: | 1. Department of Image System Science and Engineering, Pukyong National University, Pusan 608-739, Republic of Korea;2. Department of Electrical and Computer Engineering, University of Alabama, Tuscaloosa, AL 35487-0286, USA;3. School of Liberal Arts and Education, Korea University of Technology and Education, Cheonan 330-708, Republic of Korea |
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| Abstract: | Hexagonal Ba1.20Ca0.8?2x?ySiO4:xCe3+,xLi+,yMn2+ phosphors exhibit two emission bands peaking near 400 and 600 nm from the allowed f–d transition of Ce3+ ions and the forbidden 4T1–6A1 transition of Mn2+ ions, respectively. The strong interaction between Ce3+/Mn2+ ions is investigated in terms of energy transfer, crystal field effect, and microstructure by varying their concentrations. They show a higher quenching temperature of 250 °C than that of a commercially used (Ba,Sr)2SiO4:Eu2+ phosphor (150 °C). Finally, mixtures of these phosphors with green-emissive Ba1.20Ca0.70SiO4:0.10Eu2+ are tested and yielded correlated color temperatures from 3500 to 7000 K, and color rendering indices up to 95%. |
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