Highly efficient and stable inorganic phosphors with high response to near-ultraviolet excitation are essential to the performance enhancement of phosphor converted backlighting devices. Herein, highly efficient green-emitting phosphors Sr₄Al₁₄O₂₅:Ce,Tb (SAO:Ce³⁺,Tb³⁺) with a main narrow emission band at 544 nm originated from Tb³⁺ and a broad excitation band in the 250–400 nm region thanks to the sensitization of Ce³⁺ are obtained using a high temperature solid-state reaction method. The photoluminescence quantum yield is as high as 47.04% and the full width at half maximum is as small as ∼10 nm under the excitation of 348 nm n-UV light. The dipole–dipole interaction dominates the Ce³⁺ → Tb³⁺ energy transfer process and the energy transfer efficiency can reach 85% or even higher. The emission intensity @423 K for the SAO:Ce³⁺,Tb³⁺ samples remains no less than 80% of that at room temperature and the thermal quenching temperature exceeds 523 K, indicating an excellent thermal stability. Prototype WLEDs fabricated by combining the blue BaMgAl₁₀O₁₇:Eu²⁺, green SAO:Ce³⁺,Tb³⁺ and red K₂SiF₆:Mn⁴⁺ phosphors with a 350 nm n-UV LED chip show a color gamut of 85.34% National Television System Committee (NTSC) standard, which is better than that of some other existing green phosphors. This work demonstrates that the management of energy-transfer efficiency from Ce³⁺ to Tb³⁺ ions in perfectly matched inorganic compounds provides a useful and effective approach to design new green phosphors with ultra-narrow emission bands for backlit displays.

中文翻译：

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高效的绿色发光磷光体Sr4Al14O25：Ce，Tb，具有低热猝灭性和紫外光激发时的宽色域，可用于背光显示应用

对近紫外激发具有高响应的高效，稳定的无机磷光体，对于增强磷光体转换的背光设备的性能至关重要。在此，高效的绿色荧光体Sr ₄ Al ₁₄ O ₂₅：Ce，Tb（SAO：Ce ³⁺，Tb ³⁺）具有主要的544nm窄发射带，是由Tb ³⁺和宽激发带引起的。由于Ce ³⁺的敏化，在250–400 nm范围内使用高温固态反应方法获得。在348 nm n-UV光的激发下，光致发光量子产率高达47.04％，半峰全宽约10 nm。偶极-偶极相互作用主导了Ce ³⁺ →Tb ^3+的能量转移过程，能量转移效率可以达到85％甚至更高。SAO：Ce ³⁺，Tb ³⁺样品的发射强度@ 423 K保持不低于室温的80％，热淬火温度超过523 K，表明具有出色的热稳定性。通过组合蓝色BaMgAl ₁₀ O ₁₇：Eu ²⁺，绿色SAO：Ce制成的WLED原型具有350 nm n-UV LED芯片的³⁺，Tb ³⁺和红色K ₂ SiF ₆：Mn ⁴⁺荧光粉显示的色域为国家电视系统委员会（NTSC）标准的85.34％，优于其他一些标准现有的绿色荧光粉。这项工作表明，在完全匹配的无机化合物中，从Ce ³⁺到Tb ³⁺离子的能量转移效率的管理为设计用于背光显示器的具有超窄发射带的新型绿色磷光体提供了有用而有效的方法。