In this work, reciprocal energy transfer between Mn²⁺ and Eu²⁺ ions in nitride SrAlSi₄N₇ has been found and investigated in detail. In contrast to Mn²⁺‐ and Eu²⁺‐activated oxide‐based phosphors, the red light centered at 608 nm is ascribed to 4f–5d transitions of Eu²⁺ ions and Mn²⁺‐activated SrAlSi₄N₇ emits a cyan light peaking at 500 nm. Additionally, the special broad excitation band of SrAlSi₄N₇:Mn²⁺ centered at 362 nm has been covered by that of Eu²⁺ ions ranging from 300 to 550 nm. The overlap of the energy level of Mn²⁺ and Eu²⁺ ions creates the conditions for reciprocal energy transfer between Eu²⁺ and Mn²⁺ ions. A series of SrAlSi₄N₇:0.002 Mn²⁺,xEu²⁺ (0≤x≤005) with tunable light emission have been synthesized and the decay curves of samples prove the reciprocal occurrence of the energy transfer between Mn²⁺ and Eu²⁺ ions. This mode of energy transfer not only prevents the loss of energy, but also improves the thermal stability, and the intensity of SrAlSi₄N₇:Mn²⁺,Eu²⁺ at 150 °C is still beyond 92 % of the initial intensity. The results provide a new mode of energy transfer, which is expected to reduce the drawbacks existing in energy transfer.

中文翻译：

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具有可调光和出色热稳定性的基于氮化物的荧光粉SrAlSi4N7中Mn2 +和Eu2 +之间能量转移的新模式

在这项工作中，已经发现并详细研究了氮化物SrAlSi ₄ N _7中Mn ²⁺和Eu ²⁺离子之间的相互能量转移。与Mn ²⁺和Eu ²⁺活化的氧化物基磷光体相反，以608 nm为中心的红光归因于Eu ²⁺离子的4f-5d跃迁，而Mn ²⁺活化的SrAlSi ₄ N ₇发出蓝绿色。在500 nm处达到峰值。另外，以Eu ²⁺为中心覆盖了以362 nm为中心的SrAlSi ₄ N ₇：Mn ²⁺的特殊宽激发带。离子范围从300到550 nm。Mn ²⁺和Eu ²⁺离子能级的重叠为Eu ²⁺和Mn ²⁺离子之间的相互能量转移创造了条件。一系列SrAlSi的₄ Ñ ₇：0.002的Mn ²⁺，X的Eu ²⁺（0≤ X ≤005）具有可调谐光发射已被合成和样品的衰减曲线证明Mn的能量转移的倒数发生²⁺和Eu ²⁺离子。这种能量传递方式不仅可以防止能量损失，还可以提高热稳定性和SrAlSi ₄的强度。N ₇：Mn 2 ⁺，Eu ²⁺在150°C时仍超过初始强度的92％。结果提供了一种新的能量转移模式，有望减少能量转移中存在的弊端。