A novel Mn4+-activated layered oxide-fluoride perovskite-type KNaMoO2F4 red phosphor for wide gamut warm white light-emitting diode backlights
A novel Mn4+-activated layered oxide-fluoride perovskite-type KNaMoO2F4 red phosphor for wide gamut warm white light-emitting diode backlights
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一种新型 Mn4 激活层状氧化物氟化物钙钛矿型 KNaMoO2F4 红色荧光粉，用于宽色域暖白光发光二极管背光
DOI：
10.1039/d1dt01863a
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发表时间：
2021
影响因子：
4
通讯作者：
Zeng Qingguang
中科院分区：
文献类型：
--
作者：
Wu Jiao;Wang Bo;Liu Zhiyuan;Zhang Kang;Li Xiaoshuang;Huang Jianhui;Liu Pengfei;Zeng Qingguang
Mn4+激活的氧化物氟化物荧光粉因其在约630 nm处的独特红光发射和丰富的Mn离子存储而在各种固态照明设备中的应用具有吸引力。然而，由于磁偶极子的性质，Mn4+离子的零声子线（ZPL）太弱，无法在大多数基质材料中检测到。在本文中，我们介绍了一种共沉淀方法，用于合成含有[MoO2F4]2−结构单元的Mn4+掺杂氟氧化物钙钛矿KNaMoO2F4荧光粉。电子顺磁共振 (EPR) 谱与 g = 1.991 处 MnF62− 物质的存在一致。 KNaMoO2F4:0.01Mn4+荧光粉在蓝光下表现出强吸收，内量子产率（IQE）为65.8%。由于 Mn4+ 离子扭曲的八面体环境，在 625 nm 处检测到可见 ZPL 发射。根据理论计算，KNaMoO2F4 主体中的 Mn4+ 离子存在于强晶体场中，Dq/B 值高达~3.86。一系列与光致发光相关的低温光谱表明，在计算黄-里斯因子时，Mn4+发射态经历了弱电子-声子相互作用。受益于ZPL，使用YAG:Ce3+和KNaMoO2F4:Mn4+作为颜色转换器实现了暖白光发光二极管，其显色指数为Ra = 83.5和CCT = 4490 K。
Mn4+-activated oxide-fluoride phosphors are attractive for application in a wide range of solid-state lighting devices because of their distinct red emission at about 630 nm and the abundant storage of Mn ions. However, the zero-phonon line (ZPL) of Mn4+ ions is too weak to be detected in most host materials due to the magnetic dipole nature. In this article, we introduce a co-precipitation method for synthesizing a Mn4+-doped oxyfluoride perovskite KNaMoO2F4 phosphor containing [MoO2F4]2− building units. The electron paramagnetic resonance (EPR) spectra are consistent with the presence of a MnF62− species at g = 1.991. The KNaMoO2F4:0.01Mn4+ phosphor exhibits strong absorption under blue light and an internal quantum yield (IQE) of 65.8%. Attributed to the distorted octahedral environment of the Mn4+ ions, visible ZPL emission was detected at 625 nm. Based on theoretical calculations, the Mn4+ ions in the KNaMoO2F4 host exist in a strong crystal field with a high Dq/B value of ∼3.86. A series of photoluminescence-dependent low-temperature spectra indicates that the Mn4+ emissive state experiences weak electron–phonon interactions upon calculating the Huang–Rhys factor. Benefiting from the ZPL, a warm white-light-emitting diode is achieved using YAG:Ce3+ and KNaMoO2F4:Mn4+ as color converters, in which the color rendering index was Ra = 83.5 and CCT = 4490 K.