Flux-adjusted phase transformation from Ca2SiO4 to Ca3Si2O7 with Eu2+ activator for white light emitting diodes |
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| Authors: | Tian Hu Song Jun Lu Qi-fei Wang Da-jian |
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| Affiliation: | School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China;Tianjin Key Laboratory for Photoelectronic Materials and Devices, Tianjin University of Technology, Tianjin 300384,China;School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China;School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China;Tianjin Key Laboratory for Photoelectronic Materials and Devices, Tianjin University of Technology, Tianjin 300384,China;School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China; Tianjin Key Laboratory for Photoelectronic Materials and Devices, Tianjin University of Technology, Tianjin 300384,China;Key Laboratory of Display Materials and Photoelectronic Devices, Ministry of Education, Tianjin University of Technology,Tianjin 300384, China |
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| Abstract: | Eu2+-activated reddish-orange-emitting Ca3Si2O7 phosphors were synthesized with the addition of NH4Cl flux. When the phosphors were synthesized in a nominal composition of (Ca0.99Eu0.01)3Si2O7 without flux addition, a Ca3Si2O7 phase responsible for reddish-orange emission was identified to coexist with an intermediate phase of a-Ca2SiO4 for green emission. With the addition of NH4Cl flux, a-Ca2SiO4 was suppressed while the pure phase Ca3Si2O7 was obtained as the flux content was 3 wt%. Through varying the amount of flux, the emission color of samples can be tuned from green to reddish-orange, corresponding to the phase transformation from a-Ca2SiO4 to Ca3Si2O7. Through optimizing the doping concentration of Eu2+, the optimized photoluminescence (PL) properties for reddish-orange emission can be achieved, which makes this kind of phosphor prospective in the applications of the phosphor-converted white light emitting diodes (PC-WLEDs). |
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