Photoluminescence studies of high-efficient red-emitting K2Y(WO4)(PO4):Eu3+ phosphor for NUV LED

• Novel K2Y(WO4)(PO4):Eu3+ red phosphors were prepared by solid-state method.
• Phosphors exhibit strong red light under NUV excitation with quantum efficiency of 70.5 %.
• Judd–Ofelt analysis ascertains the presence of Eu3+ in a highly asymmetric environment.
• The red LED prototype was fabricated with KYWP:Eu3+ phosphor and InGaN chip.

A series of high-efficient red-emitting phosphors K2Y(WO4)(PO4):Eu3+ have been successfully synthesized by conventional solid-state reaction, and its photoluminescence (PL) properties have been investigated. The phosphors can be excited efficiently by NUV light, then exhibit strong red emission with quantum efficiency of 70.5%. The concentration quenching takes place at relatively high concentration of Eu3+ (x = 0.70), which is further confirmed by the variation of decay curves of the entitled phosphors. Judd–Ofelt analysis ascertains the presence of Eu3+ in a highly asymmetric environment. The phosphor exhibits good thermal stability (92.5% at 100 °C and 84.1% at 180 °C). The red LED prototype fabricated by opyimized-composition K2Y(WO4)(PO4):0.70Eu3+ phosphor and 395 nm-emitting InGaN chips exhibit bright red emission. The results indicate that the K2Y(WO4)(PO4):Eu3+ phosphors are promising red phosphors for NUV LED.

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