Structure and Luminescence Properties of Mn4 -Activated K3TaO2F4 Red Phosphor for White LEDs
Structure and Luminescence Properties of Mn4 -Activated K3TaO2F4 Red Phosphor for White LEDs
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白光 LED Mn4 激活 K3TaO2F4 红色荧光粉的结构和发光性能
DOI：
10.1021/acs.inorgchem.8b03577
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发表时间：
2019
影响因子：
4.6
通讯作者：
Jiao Huan
中科院分区：
文献类型：
--
作者：
Zhou Yang;Zhang Shuai;Wang Xiaoming;Jiao Huan
用简单的两步合成法合成了K3TaO2F4：Mn4+红色氟氧化物荧光粉。对K3TaO2F4：Mn4+荧光粉的结构、组成和发光性能进行了详细的研究和讨论。通过X射线粉末衍射数据Rietveld修正，对K3TaO2F4的真实结构进行了细致的研究。K3TaO2F4具有D4h群对称性[TaO2F4]3-八面体，氧占据对位。在紫外光和蓝光激发下，K3TaO2F4：Mn4+荧光粉在630 nm处发射出峰值为630 nm的窄带红光发射。利用蓝光LED芯片、YAG：Ce3+黄色荧光粉和K3TaO2F4：Mn4+红色荧光粉制备了高性能温白光发光二极管。该器件具有较高的色彩质量(CCT=3488K，Ra=93.0，R9=90.0)，表明Mn4+掺杂K3TaO2F4是一种很有前途的WLED用红色荧光粉。
A novel red oxyfluoride phosphor K3TaO2F4:Mn4+has been prepared by a simple two-step synthesis method. The structure, composition, and luminescence properties of K3TaO2F4:Mn4+phosphors were investigated and discussed in detail. The real structure of K3TaO2F4was carefully studied through X-ray powder diffraction data Rietveld refinement. K3TaO2F4holds aD4hgroup symmetry [TaO2F4]3–octahedron with the oxygen occupying thepara-position. Under ultraviolet (UV) and blue light excitation, K3TaO2F4:Mn4+phosphor emits a narrow band red emission peaking at 630 nm. High-performance warm white-light-emitting diodes (WLEDs) were fabricated using a blue LED chip, YAG:Ce3+yellow phosphor, and K3TaO2F4:Mn4+red phosphor. This device exhibits high color quality (CCT = 3488 K, Ra = 93.0, R9 = 90.0), which indicates that Mn4+-doped K3TaO2F4would be a promising red phosphor for WLED applications.