Red phosphor often plays a crucial role in enhancing the lighting quality of WLEDs. However, it still remains difficult to develop a red phosphor with high efficiency, outstanding thermal stability, and high color purity. The struggle against “thermal stability” has always been an inevitable task for photoluminescent materials. In this work, we propose a method inspired by nonlinear optical materials to synthesize a novel red-emitting pyrophosphate phosphor Cs2MgZn2(P2O7)2: Eu3+. The phase purity and morphology features are clearly investigated by X-ray diffraction and scanning electron microscopy. The emission spectra shows that Cs2MgZn2(P2O7)2: 20%Eu3+ can emit bright red light with high color purity (84.68%) under ultraviolet light excitation. XRD Rietveld refinement and luminescence kinetics as a function of Eu3+ doping concentration are then used to gain information about crystal structure to find out the Eu3+ site occupation preference. In particular, the sample exhibits excellent thermal stability (100%@170 °C) due to zero thermal quenching behavior, and the mechanism is described in detail. The present work provides a new possibility for the research and application of zero-thermal quenching phosphors. In addition, the fabricated WLED device has satisfactory CIE coordinates (0.3508, 0.3233), outstanding correlated color temperature (CCT = 4608 K) and strong emission intensity, which demonstrates its potential for application in the field of WLED solid-state lighting field.

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