Abstract A broadband blue-emitting Sr1-xCaxLu2O4:Ce3+ (x = 0−0.2) phosphors were synthesized, which can be used for near-UV pumped white light-emitting diodes (w-LEDs). The crystal structures, photoluminescence properties, external quantum efficiency, thermal stability and application performance of Sr1-xCaxLu2O4:Ce3+, by partially substituting Sr2+ with Ca2+ (x = 0−0.2), were studied and discussed by various analytical techniques. When the Ca/Sr ratio of Sr1-xCaxLu2O4:Ce3+ gradually increased, the emission peak of Sr1-xCaxLu2O4:Ce3+ was red-shifted from 459 to 465 nm, and corrected external quantum efficiency increased from 31.8% to 42.9%, and the thermal stability was also improved. The mechanisms and reasons of the changes of the photoluminescence emission and excitation spectra, external quantum efficiency and thermal stability properties were also investigated in detail. In addition, a w-LED was fabricated by using SrLu2O4:Ce3+ (blue), β-sialon:Eu2+ (green) and (Sr,Ca)AlSiN3:Eu2+ (red) phosphors combined a 405 nm near-UV LED chip, its color rendering index (CRI) reached 96.0. When applied Sr0.8Ca0.2Lu2O4:Ce3+ as blue phosphor to substitute SrLu2O4:Ce3+, the obtained w-LED devices had the higher luminous efficiency, and CRI greater than 95.0. These results show that the Sr1-xCaxLu2O4:Ce3+ were potential blue phosphors for n-UV pumped high CRI w-LEDs application.

中文翻译：

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用于高 CRI 白光 LED 的蓝光 Sr1-Ca Lu2O4:Ce3+ 荧光粉

摘要 合成了一种宽带蓝光 Sr1-xCaxLu2O4:Ce3+ (x = 0−0.2) 荧光粉，可用于近紫外泵浦白光发光二极管 (w-LED)。Sr1-xCaxLu2O4:Ce3+ 的晶体结构、光致发光特性、外量子效率、热稳定性和应用性能，通过用 Ca2+ (x = 0-0.2) 部分取代 Sr2+，通过各种分析技术进行了研究和讨论。当 Sr1-xCaxLu2O4:Ce3+ 的 Ca/Sr 比逐渐增大时，Sr1-xCaxLu2O4:Ce3+ 的发射峰由 459 nm 红移至 465 nm，校正外量子效率从 31.8% 增加到 42.9%，热能稳定性也得到了提高。光致发光发射光谱和激发光谱变化的机制和原因，还详细研究了外部量子效率和热稳定性。此外，使用 SrLu2O4:Ce3+（蓝色）、β-sialon:Eu2+（绿色）和 (Sr,Ca)AlSiN3:Eu2+（红色）荧光粉结合 405 nm 近紫外 LED 芯片制造了 w-LED，其显色指数（CRI）达到96.0。当应用Sr0.8Ca0.2Lu2O4:Ce3+作为蓝色荧光粉替代SrLu2O4:Ce3+时，得到的w-LED器件具有更高的发光效率，显色指数大于95.0。这些结果表明 Sr1-xCaxLu2O4:Ce3+ 是用于 n-UV 泵浦高 CRI w-LED 应用的潜在蓝色荧光粉。2Lu2O4:Ce3+作为蓝色荧光粉替代SrLu2O4:Ce3+，得到的w-LED器件具有更高的发光效率，显色指数大于95.0。这些结果表明 Sr1-xCaxLu2O4:Ce3+ 是用于 n-UV 泵浦高 CRI w-LED 应用的潜在蓝色荧光粉。2Lu2O4:Ce3+作为蓝色荧光粉替代SrLu2O4:Ce3+，得到的w-LED器件具有更高的发光效率，显色指数大于95.0。这些结果表明 Sr1-xCaxLu2O4:Ce3+ 是用于 n-UV 泵浦高 CRI w-LED 应用的潜在蓝色荧光粉。