Phosphor-converted white light-emitting diodes (pc-WLEDs) are efficient light sources used in lighting, high-tech displays, and electronic devices. One of the most significant challenges of pc-WLEDs is the thermal quenching, in which the phosphor suffers from emission loss with increasing temperature during high-power LED operation. Here, we report a blue-emitting Na_3–2xSc₂(PO₄)₃:xEu²⁺ phosphor (λ_em = 453 nm) that does not exhibit thermal quenching even up to 200 °C. This phenomenon of zero thermal quenching originates from the ability of the phosphor to compensate the emission losses and therefore sustain the luminescence with increasing temperature. The findings are explained by polymorphic modification and possible energy transfer from electron–hole pairs at the thermally activated defect levels to the Eu²⁺ 5d-band with increasing temperature. Our results could initiate the exploration of phosphors with zero thermal quenching for high-power LED applications.

磷光转换的白光发光二极管（pc-WLED）是用于照明，高科技显示器和电子设备的高效光源。pc-WLED的最重大挑战之一是热淬火，在大功率LED工作期间，随着温度的升高，磷光体会遭受发射损耗的困扰。这里，我们报告一个蓝色发光的Na _{3-2 X}钪₂（PO ₄）₃：X的Eu ²⁺磷光体（λ _EM= 453 nm）甚至在200°C时也不会出现热淬火。零热猝灭的这种现象源于磷光体补偿发射损耗并因此随着温度升高而维持发光的能力。这些发现可以通过多晶型修饰以及随着温度升高从热激活缺陷能级上的电子-空穴对到Eu ²⁺ 5 d波段的能量转移来解释。我们的结果可能会启动对零功率淬火的荧光粉进行大功率LED应用的探索。