Although the green light emission of Tb ions can be effectively improved by utilizing energy transfer from Eu to Tb ions, obtaining phosphors with high quantum efficiency remains a major problem. Here, we have achieved a novel apatite-type structure CaLa(PO)O (CLPO) containing Eu and Tb ions. The CLPO:Eu is capable of being effectively excited by near-ultraviolet light and emits blue light at about 460 nm. Energy transfer from the Eu to Tb ions in CLPO:Eu,Tb can be readily constructed by utilizing the energy transfer from Eu to Tb ions. The optimized phosphor CLPO:0.02Eu,0.7Tb has a high internal quantum efficiency of 96.6% and an external quantum efficiency of 64.7%. CLPO:0.02Eu,0.7Tb and commercially available blue and red phosphors were coupled with a 365 nm chip package to form WLEDs, which presented a good value (89.9) and correlated color temperature (3808 K). Our work provides an avenue to realize novel and efficient green phosphors by selecting suitable hosts and constructing efficient energy transfer.
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