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Single‐Crystal Red Phosphors: Enhanced Optical Efficiency and Improved Chemical Stability for wLEDs
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-12-27 , DOI: 10.1002/adom.201901512 Zhengliang Wang 1 , Zhiyu Yang 1 , Nan Wang 1 , Qiang Zhou 1 , Jianbang Zhou 2 , Li Ma 3 , Xiaojun Wang 3 , Yiqing Xu 4 , Mikhail G. Brik 5 , Miroslav D. Dramićanin 6 , Mingmei Wu 2
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-12-27 , DOI: 10.1002/adom.201901512 Zhengliang Wang 1 , Zhiyu Yang 1 , Nan Wang 1 , Qiang Zhou 1 , Jianbang Zhou 2 , Li Ma 3 , Xiaojun Wang 3 , Yiqing Xu 4 , Mikhail G. Brik 5 , Miroslav D. Dramićanin 6 , Mingmei Wu 2
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Crystal phosphors have many unique advantages compared with powdery ones. Herein, room‐temperature‐grown millimeter‐sized single‐crystal phosphors of Cs2XF6:Mn4+ (X = Ge, Si, and Ti) with remarkably higher external quantum efficiency than the corresponding powdery samples are reported. In addition, as compared with the powdery ones, the crystal samples exhibit much better stability toward water under different pH conditions. The red light‐emitting diodes (LEDs) based on Cs2XF6:Mn4+ crystals show significantly improved luminous efficiency than those based on their corresponding powders. An assembled white LED device composed of the two layers of phosphors, i.e., the crystal (such as Cs2GeF6:Mn4+) and commercial Y3Al5O12:Ce3+, on a blue chip exhibits intense warm white light with high luminous efficiency (up to 193 lm W−1), high color rendering indexes (88), and low correlated color temperatures (3107 K). Hence, these crystals with greatly improved efficiency and stability can be potentially applied in high‐quality LED backlighting display and white LED lighting, especially inside the micro‐LED devices.
中文翻译：
单晶红色荧光粉：增强了wLED的光学效率和化学稳定性
与粉末状荧光粉相比，晶体荧光粉具有许多独特的优势。本文报道了室温生长的Cs 2 XF 6：Mn 4+（X = Ge，Si和Ti）毫米大小的单晶磷光体，其外部量子效率明显高于相应的粉末状样品。另外，与粉末状样品相比，在不同pH条件下，晶体样品对水的稳定性更好。基于Cs 2 XF 6：Mn 4+的红色发光二极管（LED）与基于其相应粉末的晶体相比，晶体显示出显着改善的发光效率。由蓝光芯片上的晶体（例如Cs 2 GeF 6：Mn 4+）和商业Y 3 Al 5 O 12：Ce 3+两层荧光粉组成的组装白色LED器件呈现出强烈的暖白光具有高发光效率（高达193 lm W -1），高显色指数（88）和低相关色温（3107 K）的光源。因此，这些效率和稳定性大大提高的晶体可潜在地应用于高质量LED背光显示器和白色LED照明，尤其是在microLED器件内部。
更新日期：2020-03-20
中文翻译：
单晶红色荧光粉：增强了wLED的光学效率和化学稳定性
与粉末状荧光粉相比，晶体荧光粉具有许多独特的优势。本文报道了室温生长的Cs 2 XF 6：Mn 4+（X = Ge，Si和Ti）毫米大小的单晶磷光体，其外部量子效率明显高于相应的粉末状样品。另外，与粉末状样品相比，在不同pH条件下，晶体样品对水的稳定性更好。基于Cs 2 XF 6：Mn 4+的红色发光二极管（LED）与基于其相应粉末的晶体相比，晶体显示出显着改善的发光效率。由蓝光芯片上的晶体（例如Cs 2 GeF 6：Mn 4+）和商业Y 3 Al 5 O 12：Ce 3+两层荧光粉组成的组装白色LED器件呈现出强烈的暖白光具有高发光效率（高达193 lm W -1），高显色指数（88）和低相关色温（3107 K）的光源。因此，这些效率和稳定性大大提高的晶体可潜在地应用于高质量LED背光显示器和白色LED照明，尤其是在microLED器件内部。
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