Single-Crystal Red Phosphors and Their Core-Shell Structure for Improved Water-Resistance for Laser Diodes Applications
Single-Crystal Red Phosphors and Their Core-Shell Structure for Improved Water-Resistance for Laser Diodes Applications
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单晶红色荧光粉及其核壳结构可改善激光二极管应用的耐水性
DOI：
10.1002/anie.202011022
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Wu Mingmei
中科院分区：
文献类型：
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作者：
Zhou Jianbang;Wang Yunfeng;Chen Yingyuan;Zhou Yayun;Milicevic Bojana;Zhou Lei;Yan Jing;Shi Jianxin;Liu Ru-Shi;Wu Mingmei
溶剂-蒸气传输路线产生厘米大小的单晶红色磷光体。采用外延生长的方法在室温下获得核壳结构。这些红色磷光体可以应用于所有无机WLED器件中。与多晶粉末相比，Cs2 TiF 6：Mn 4+（CTFM）单晶提供了增强的量子效率、耐湿性和热稳定性。内量子效率可达98.7%。为了进一步提高防水稳定性，在CTFM单晶表面外延生长了厚度可调的Cs2 TiF 6（CTF）壳层，并提出了独特的三步光致发光强度演化机制。通过将所制备的CTFM@CTF核壳结构单晶、YAG：Ce单晶和蓝芯片组合，在没有任何有机树脂的情况下制造了具有优异显色性（Ra=90，R9=94）、低相关色温（CCT=3155 K）和高发光效率的温WLED。
A solvent‐vapor transport route produces centimeter‐sized single‐crystal red phosphors. The epitaxial growth route to yield its core–shell structure at ambient temperature was adopted. These red phosphors could be applied in all‐inorganic WLED devices. Cs2TiF6:Mn4+(CTFM) single crystal provides enhancement of quantum efficiency, moisture resistance, and thermal stability compared to polycrystalline powders. The internal quantum efficiency can reach as high as 98.7 %. To further improve waterproof stability, the Cs2TiF6(CTF) shell with tunable thickness has been epitaxially grown on the CTFM single crystal surface and a unique three‐step photoluminescence intensity evolution mechanism has been proposed. By combining as‐prepared CTFM@CTF core–shell structured single crystal, YAG:Ce single crystal and blue‐chip, warm WLEDs with excellent color rendition (Ra=90, R9=94), low correlated color temperature (CCT=3155 K), and high luminous efficacy were fabricated without any organic resins.