Hydrothermal synthesis, morphology and photoluminescent properties of an Mn4+-doped novel red fluoride phosphor elpasolite K2LiAlF6
Hydrothermal synthesis, morphology and photoluminescent properties of an Mn4+-doped novel red fluoride phosphor elpasolite K2LiAlF6
复制标题
Mn4掺杂新型红色氟化物荧光粉钾冰晶石K2LiAlF6的水热合成、形貌及光致发光性能
DOI：
10.1039/c6tc01366j
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发表时间：
2016
影响因子：
6.4
通讯作者：
Sua Qiang
中科院分区：
文献类型：
--
作者：
Zhu Yiwen;Huang Lin;Zou Rui;Zhang Jinhui;Yu Jinbo;Wu Mingmei;Wang Jing;Sua Qiang
目前，通过绿色合成路线获得的新的发射红光的Mn 4+激活的氟化物磷光体在用于固态照明和显示器中的先进应用的发光材料领域中仍然是一个巨大的挑战。本研究首次开发了一种新型的红色氟化物荧光粉K2 LiAlF 6：Mn 4+，并在低毒的H3 PO 4/KHF 2液体中合成，取代了合成氟化物荧光粉所必需的剧毒HF液体。系统研究了K_2LiAlF_6：Mn ~（4+）的形貌和发光特性。结果表明，由于K2 TiF 6和K2 LiAlF 6在阳离子位置对称性和基质象似性方面的相似性，Mn 4+离子在300 ~ 500 nm范围内具有宽带激发，与紫外和蓝光LED芯片匹配良好，在635 nm处获得理想的红光发射。此外，K2 LiAlF 6：Mn 4+在300-500 K温度范围内具有优异的热猝灭行为和颜色稳定性，与商业红色氮化物荧光粉（Sr）CaAlSiN 3：Eu 2+相比。
Presently, new red emitting Mn4+ activated fluoride phosphors that are obtained via green synthetic routes remain a great challenge in the field of luminescent materials for advanced applications in solid state lighting and displays. In this study, for the first time, we develop a novel red emitting fluoride phosphor, K2LiAlF6:Mn4+, and it is synthesized in low-toxic H3PO4/KHF2 liquid instead of the highly toxic HF liquid, which is a necessity in the synthesis of fluoride phosphors. Moreover, the morphology and photoluminescence properties of K2LiAlF6:Mn4+ were systematically investigated. The results show that the Mn4+ ion exhibits a broadband excitation extending from 300 to 500 nm, which matches well with UV and blue LED chips and obtains an ideal red emission at 635 nm, due to the similarities in cation site symmetry and host iconicity between the famous K2TiF6 and target K2LiAlF6. Moreover, K2LiAlF6:Mn4+ has an excellent thermal quenching behavior and color stability in the temperature range of 300–500 K, compared with the commercial red nitride phosphor (Sr)CaAlSiN3:Eu2+.