A series of high‐efficiency narrow band red‐emitting La₂M₂O₉:Eu³⁺ (M = Mo/W) phosphors for white LEDs was synthesized using a conventional solid‐state reaction method. All the compositions show absorption in the near ultraviolet (UV) light region due to charge transfer from O to M (M = W and Mo). In order to investigate the luminescence quenching effect, the Eu³⁺ concentration was varied in the La₂M₂O₉ lattice. The tungstate analogue had a quantum yield of 46.5%, whereas the molybdate equivalent had a comparatively subordinate value (15.4%). The phosphor could be competently excited by ~395 or 465 nm photons (could be integrated well with a near‐UV or blue LED chip) and showed dominant red emission electric‐dipole transition (⁵D₀→⁷F₂) with sharp spectral lines due to 4f–4f electronic transition of the Eu³⁺ ion and potential red‐emitting colour converters for white LEDs. The red LED was fabricated by integrating the best phosphor composition with a near‐UV LED and a white hybrid LED was fabricated by conjugating with a yellow organic dye and a red phosphor with near‐UV LEDs. The white hybrid LED showed an excellent colour rendering index (83%), with CIE colour coordinates (0.313, 0.365) and CCT (6280 K).

中文翻译：

---

基于混合金属氧化物的新型窄带红光发射器及其在混合白色发光二极管中的应用

使用常规固态反应方法合成了一系列用于白色LED的高效窄带红色发射La ₂ M ₂ O ₉：Eu ³⁺（M = Mo / W）荧光粉。由于电荷从O转移到M（M = W和Mo），因此所有组合物在近紫外（UV）光区域均显示吸收。为了研究发光猝灭效应，在La ₂ M ₂ O _9中改变了Eu ^3+的浓度。格子。钨酸盐类似物的量子产率为46.5％，而钼酸盐当量的相对值较低（15.4％）。磷光体可以被〜395或465 nm光子完全激发（可以与近紫外或蓝色LED芯片很好地集成在一起），并显示出主要的红色发射电偶极跃迁（⁵ D ₀ → ⁷ F ₂），并具有清晰的光谱线由于Eu ^3+的4f–4f电子跃迁适用于白色LED的离子和潜在红色发射颜色转换器。红色LED是通过将最佳的磷光体成分与近紫外LED集成在一起而制成的，而白色混合LED是通过与黄色有机染料和红色磷光体与近紫外LED结合而制成的。白色混合LED表现出出色的显色指数（83％），具有CIE色坐标（0.313，0.365）和CCT（6280 K）。