Red-emitting phosphor Rb2TiF6:Mn4+ with high thermal-quenching resistance for wide color-gamut white light-emitting diodes
Red-emitting phosphor Rb2TiF6:Mn4+ with high thermal-quenching resistance for wide color-gamut white light-emitting diodes
复制标题
用于宽色域白光发光二极管的高耐热猝灭性红光荧光粉Rb2TiF6:Mn4
DOI：
10.1016/j.optmat.2017.05.055
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发表时间：
2017
影响因子：
3.9
通讯作者：
Liang Hongbin
中科院分区：
文献类型：
--
作者：
Wang Zhengliang;Yang Zhiyu;Tan Huiying;Brik Mikhail G.;Zhou Qiang;Chen Guo;Liang Hongbin
红光荧光粉是提高荧光粉转换白色发光二极管（pc-WLED）性能的关键。本文采用离子交换法在温和条件下合成了红色荧光粉Rb_2TiF_6：Mn ~（4+）。采用X射线粉末衍射（XRD）、扫描电子显微镜（SEM）和X射线光电子能谱（XPS）对样品的晶体结构和形貌进行了表征。对Rb_2TiF_6：Mn ~（4+）的Rietveld精修表明，该样品为单相六方晶体结构。所制备的Rb 2 TiF 6：Mn 4+具有尖锐的红光发射，在460 nm处具有较宽的激发带。对Mn ~（4+）的发光行为进行了详细的讨论。温度依赖的发射光谱表明，该荧光粉具有很高的抗热猝灭性和优异的颜色稳定性。采用商用Y3 Al 5 O 12：Ce 3+和Rb 2 TiF 6：Mn 4+组合工艺在蓝色GaN-LED芯片上制备了一系列显色指数和色温可调的WLED。通过添加Rb 2 TiF 6：Mn 4+，获得了低色温（3123 K）、高显色指数（91.5）和高光效（187.9lm/W）的宽色域白光LED。这些研究结果表明，这种荧光粉可能是一个有前途的商业红色荧光粉在宽色域WLED。
Red-emitting phosphor plays a critical role in improving performance of the phosphor-converted white light-emitting diodes (pc-WLEDs). Herein, a red-emitting phosphor, Rb2TiF6:Mn4+, was synthesizedviathe ion exchange method under mild condition. The crystal structure and morphology were characterized by the powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The Rietveld refinements of Rb2TiF6:Mn4+indicate that this sample is of single phase with hexagonal crystal structure. The as-prepared Rb2TiF6:Mn4+has sharp red emissions with broad excitation band at ∼460 nm. The luminescent behavior of Mn4+was discussed in detail. The temperature-dependent emission spectra of Rb2TiF6:Mn4+indicate that this phosphor shares high thermal quenching resistance and excellent color stability. A series of WLEDs with tunable color rendering index and color temperature were fabricated by combining commercial Y3Al5O12:Ce3+and Rb2TiF6:Mn4+on blue GaN-LED chips. With the addition of Rb2TiF6:Mn4+, WLED with wide gamut was obtained with low color temperature (3123 K), high color rendering index (91.5) and high luminous efficacy (187.9 lm/W). These findings show this phosphor could be a promising commercial red phosphor in wide color-gamut WLEDs.