Flux-adjusted phase transformation from Ca2SiO4 to Ca3Si2O7 with Eu2+ activator for white light emitting diodes

TIAN Hua; SONG Jun; LU Qi-fei; WANG Da-jian

doi:doi:10.1007/s11801-012-2257-y

光电子快报（英文版）, 2012, 8 (5): 352, Published Online: Jul. 12, 2017

Flux-adjusted phase transformation from Ca₂SiO₄ to Ca₃Si₂O₇ with Eu^{2+^{activator for white light emitting diodes}}

TIAN Hua ^1,2SONG Jun ¹LU Qi-fei ^1,2WANG Da-jian ^1,2,3,*

Author Affiliations

¹ School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China

² Tianjin Key Laboratory for Photoelectronic Materials and Devices, Tianjin University of Technology, Tianjin 300384, China

³ Key Laboratory of Display Materials and Photoelectronic Devices, Ministry of Education, Tianjin University of Technology, Tianjin 300384, China

Abstract

Eu^{2+^{-activated reddish-orange-emitting Ca₃Si₂O₇ phosphors were synthesized with the addition of NH₄Cl flux. When the phosphors were synthesized in a nominal composition of (Ca_0.99Eu_0.01)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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TIAN Hua, SONG Jun, LU Qi-fei, WANG Da-jian. Flux-adjusted phase transformation from Ca₂SiO₄ to Ca₃Si₂O₇ with Eu^{2+^{activator for white light emitting diodes[J]. 光电子快报（英文版）, 2012, 8(5): 352.}}

Flux-adjusted phase transformation from Ca₂SiO₄ to Ca₃Si₂O₇ with Eu^{2+^{activator for white light emitting diodes}}

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