Abstract In this work, we present a novel Mn4+-activated Rb2NaAlF6 red phosphor synthesized through a cation exchange route at room temperature. The structural and optical features were characterized by X-ray diffraction, energy dispersive X-ray spectrometer, scanning electron microscopy, X-ray fluorescence, emission, excitation, and luminescence decay curves. The straightforward evidences have shown that the as-prepared Rb2NaAlF6:Mn4+ crystallizes into single cubic phase with regular octahedral particulate morphology, and exhibits broad excitation band and sharp emission lines in the red and blue regions. The luminescence properties, thermal stability and optical performance were systematically investigated to recognize the luminescence behavior of Rb2NaAlF6:Mn4+ and its potential application for white light illumination. The results suggest that the Rb2NaAlF6:Mn4+ phosphor exhibits excellent thermal stability and is capable of tuning the cold white light to warm in white light-emitting diodes.

中文翻译：

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用于固态照明的新型 Rb2NaAlF6:Mn4+ 红色荧光粉的合成、结构和光致发光性能

摘要 在这项工作中，我们提出了一种在室温下通过阳离子交换途径合成的新型 Mn4+ 激活的 Rb2NaAlF6 红色荧光粉。通过X射线衍射、能量色散X射线光谱仪、扫描电子显微镜、X射线荧光、发射、激发和发光衰减曲线表征结构和光学特征。直接的证据表明，所制备的 Rb2NaAlF6:Mn4+ 结晶成具有规则八面体颗粒形态的单立方相，并在红色和蓝色区域显示出宽的激发带和尖锐的发射线。系统地研究了发光特性、热稳定性和光学性能，以识别 Rb2NaAlF6:Mn4+ 的发光行为及其在白光照明中的潜在应用。