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>Flux-adjusted phase transformation from Ca _2SiO _4 to Ca _3Si _2O _7 with Eu ~(2+) activator for white light emitting diod
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Flux-adjusted phase transformation from Ca _2SiO _4 to Ca _3Si _2O _7 with Eu ~(2+) activator for white light emitting diod
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机译：Flux-adjusted phase transformation from Ca _2SiO _4 to Ca _3Si _2O _7 with Eu ~(2+) activator for white light emitting diod
Eu ~(2+)-activated reddish-orange-emitting Ca _3Si _2O _7 phosphors were synthesized with the addition of NH _4Cl flux. When the phosphors were synthesized in a nominal composition of (Ca _(0. 99)Eu _(0. 01)) _3Si _2O _7 without flux addition, a Ca _3Si _2O _7 phase responsible for reddish-orange emission was identified to coexist with an intermediate phase of a-Ca _2SiO _4 for green emission. With the addition of NH _4Cl flux, a-Ca _2SiO _4 was suppressed while the pure phase Ca _3Si _2O _7 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-Ca _2SiO _4 to Ca _3Si _2O _7. Through optimizing the doping concentration of Eu ~(2+), 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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