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

• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2012,（5）
• 页码范围: 352-355
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11801-012-2257-y

摘要

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 β-Ca2SiO4 for green emission.With the addition of NH4Cl flux,β-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 β-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).