Red phosphor is an important component of the phosphor-converted white light-emitting diodes (pc-WLEDs). The development of the novel red phosphor with excellent luminescence properties is of great significance for high performance WLEDs. In this study, NaGdEuMgZnWO red phosphors with excellent luminescence properties were successfully synthesized and systematically investigated. Our results show that the Zn-doping concentration has significant effect on the microstructures and luminescence properties of the NaGdEuMgZnWO phosphors. The NaGdEuMgZnWO (0 ≤ ≤ 0.7) samples are well crystallized pure solid solution sub-microcrystals, whereas the phase purity gradually decreases at 0.7 < ≤ 1.0. The NaGdEuMgZnWO (0 < ≤ 0.5) phosphors have stronger emissions than NaGdEuMgWO, and the optimized NaGdEuMgZnWO phosphor possesses the best luminescence properties including thermal stability, CIE chromaticity coordinate, life time and quantum yield. The packaged WLED using NaGdEuMgZnWO phosphor emits bright white light with higher CRI, lower CCT, and chromaticity coordinate close to the pure white light. The developed NaGdEuMgZnWO phosphors have potential application in lighting and display. This work can offer an effective strategy for boosting luminescence properties of tungstate phosphors with the double perovskite structure.

中文翻译：

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NaGd0.4Eu0.6Mg1–xZnxWO6固溶体红色荧光粉：Zn2+掺杂引起的微观结构变化和发光增强


红色荧光粉是荧光粉转换白光发光二极管（pc-WLED）的重要组成部分。开发具有优异发光性能的新型红色荧光粉对于高性能WLED具有重要意义。本研究成功合成并系统研究了具有优异发光性能的NaGdEuMgZnWO红色荧光粉。结果表明，Zn掺杂浓度对NaGdEuMgZnWO荧光粉的微观结构和发光性能有显着影响。 NaGdEuMgZnWO (0 ≤ ≤ 0.7) 样品是结晶良好的纯固溶体亚微晶，而相纯度在 0.7 < ≤ 1.0 时逐渐降低。 NaGdEuMgZnWO (0 < ≤ 0.5)荧光粉比NaGdEuMgWO荧光粉具有更强的发射能力，优化后的NaGdEuMgZnWO荧光粉具有最好的发光性能，包括热稳定性、CIE色度坐标、寿命和量子产率。采用NaGdEuMgZnWO荧光粉封装的WLED可发出明亮的白光，具有较高的CRI、较低的CCT，色品坐标接近纯白光。所开发的NaGdEuMgZnWO荧光粉在照明和显示方面具有潜在的应用前景。这项工作可以为提高双钙钛矿结构钨酸盐荧光粉的发光性能提供有效的策略。