Sm³⁺, Ce³⁺ singly doped and Ce³⁺-Sm³⁺ co-activated LaSi₃N₅ were synthesized by a solid-state reaction method. The crystal structure, morphology and luminescent properties of the corresponding samples are characterized. The photoluminescence results demonstrate that LaSi₃N₅:Ce³⁺ phosphor has a broad band excitation spectra and emission spectra with peak at 418 nm, while LaSi₃N₅:Sm³⁺ phosphor demonstrates characteristics of linear excitation spectra with main peak locating at 407 nm. An apparent spectral crossover between the emission spectrum of LaSi₃N₅:Ce³⁺ and excitation spectrum of LaSi₃N₅:Sm³⁺ can be observed, pointing to the possibility of energy transfer from Ce³⁺ to Sm³⁺, which is further proved by the investigations of diffuse reflectance spectra, emission spectra, and fluorescence lifetime decay curves. The energy transfer efficiency reaches the maximum of 65.5%. The mechanism of energy transfer was determined to be electric dipole-dipole interaction. This study provides a new example for the development of efficient phosphors in Ce³⁺- Sm³⁺ codoped nitrides.

钐³⁺，Ce的³⁺单掺杂和Ce ³⁺ -Sm ³⁺共活化椰子₃ Ñ ₅通过固相反应法合成。表征了相应样品的晶体结构、形貌和发光性能。光致发光结果表明，LaSi ₃ N ₅ :Ce ³⁺荧光粉具有宽带激发光谱和发射光谱，峰值在418 nm，而LaSi ₃ N ₅ :Sm ³⁺荧光粉表现出线性激发光谱的特性，主峰位于 407 nm。可以观察到LaSi ₃ N ₅ :Ce ^{3+ 的}发射光谱和 LaSi ₃ N ₅ :Sm ^{3+ 的}激发光谱之间存在明显的光谱交叉，表明能量从 Ce ³⁺转移到 Sm ³⁺的可能性，通过漫反射光谱、发射光谱和荧光寿命衰减曲线的研究进一步证明了这一点。能量传递效率最高可达65.5%。能量转移的机制被确定为电偶极-偶极相互作用。该研究为在 Ce ³⁺ - Sm ³⁺共掺杂氮化物中开发高效磷光体提供了一个新的例子。