Abstract Red-emitting ceramic phosphors are significant for warm white light emitting diodes (WLEDs) with high color rendering index (CRI). In this work, Mn doped spinel ceramic phosphors were prepared via high temperature solid-state reaction sintering. The photoluminescence properties of the as-prepared ceramic phosphors were elaborately discussed. The Mn4+ doped spinel ceramics were successfully obtained by incorporating excessive Mg2+ as the charge compensator. They showed red emission peaking at 652 nm under 450 nm excitation. Furthermore, it's exciting to find that the red-emitting ceramic phosphors showed high thermal stability. As operated at 450 K, the emission intensity remained about 66% of the initial intensity operated at room temperature. The results indicate that the Mn4+ doped spinel ceramic phosphors are promising red color converters for warm-WLEDs.

中文翻译：

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热稳定Mn4+掺杂尖晶石红光陶瓷荧光粉的制备及发光性能

摘要 发红光的陶瓷荧光粉对于高显色指数（CRI）的暖白光发光二极管（WLED）具有重要意义。在这项工作中，通过高温固相反应烧结制备了Mn掺杂尖晶石陶瓷荧光粉。详细讨论了所制备的陶瓷荧光粉的光致发光性能。通过加入过量的 Mg2+ 作为电荷补偿剂，成功地获得了 Mn4+ 掺杂的尖晶石陶瓷。在 450 nm 激发下，它们在 652 nm 处显示红色发射峰。此外，令人兴奋的是发现发红光的陶瓷磷光体显示出高热稳定性。在 450 K 下操作时，发射强度保持在室温下操作的初始强度的 66% 左右。