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Structure and photoluminescence properties of Sr3CeNa(PO4)3F:Eu2+ phosphors for full-spectrum WLEDs application

Wu Tao,Dong Langping,Yang Shuai,Zhang Ganghua,Zhao Guoying,Hou Jingshan,Fang Yongzheng

A series of novel blue-emitting Sr 3 CeNa(PO 4 ) 3 F:Eu 2+ (SCNPOF:Eu 2+ ) phosphors were synthesized through solid-state reaction. The as-prepared phosphor shows a blue light emission ranging from 350 ~ 550 nm centered at 447 nm under 340 nm UV light excitation, attributed to the 4f-5d transition of Eu 2+ . The energy transfer mechanism from Ce 3+ to Eu 2+ was identified as dipole–dipole interaction, and the energy transfer efficiency and critical distance were calculated. Subsequently, a white light-emitting diode (WLED) with a color rendering index of 94 was fabricated by combining a 365 nm UV-LED chip with the as-prepared blue-emitting SCNPOF:Eu 2+ phosphor, commercial green (Ba, Sr) 2 SiO 4 :Eu 2+ phosphor, and red CaAlSiN 3 :Eu 2+ phosphor. The results indicate that the SCNPOF:Eu 2+ phosphors have potential application in UV-based WLEDs.