Double perovskite LiLaMgWO6:Eu3+ novel red-emitting phosphors for solid sate lighting: Synthesis, structure and photoluminescent properties
Double perovskite LiLaMgWO6:Eu3+ novel red-emitting phosphors for solid sate lighting: Synthesis, structure and photoluminescent properties
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用于固态照明的双钙钛矿LiLaMgWO6:Eu3新型红光荧光粉：合成、结构和光致发光性能
DOI：
10.1016/j.ceramint.2016.11.093
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发表时间：
2017-02-01
影响因子：
5.2
通讯作者：
Suchocki, Andrzej
中科院分区：
文献类型：
--
作者：
Li, Li;Chang, Wenxuan;Suchocki, Andrzej
采用高温固相反应法合成了LiLaMgWO 6：Eu 3+荧光粉，研究了其结构、紫外-可见漫反射光谱、光致发光和衰减特性与Eu 3+浓度的关系。XRD结果表明，所制备的LiLaMgWO 6：Eu 3+荧光粉均为单斜双钙钛矿结构，空间群为C2/m，具有良好的红光发射和有效的激发，在250 ~ 350 nm范围内有一个宽带，在450 ~ 580 nm范围内有多个窄的激发峰。中心位于615 nm的主要红色发射带的存在表明，Eu 3+进入晶格位置没有反转对称性。Eu ~（3+）的猝灭浓度可达30mol%。讨论了理论猝灭浓度和猝灭机理。此外，还详细讨论了热猝灭、CIE色坐标、量子产率、Judd-Ofelt分析和能量传递机理。
LiLaMgWO6:Eu3+ phosphors have been synthesized by high-temperature solid-state reaction and their structure, ultraviolet-visible diffuse reflectance spectra, photoluminescence and decay properties have been investigated as a function of the Eu3+ concentration. The XRD results indicated that all the prepared phosphors can be assigned to a monoclinic double perovskite structure in space group C2/m.LiLaMgWO6:Eu3+ phosphor has exhibited excellent red emission and efficient excitation, consisting of a broad band ranging from 250 to 350 nm as well as several narrow excitation peaks between 450 and 580 nm. The presence of dominant red emission band centered at 615 nm suggested that Eu3+ enters in the lattice site without inversion symmetry. The quenching concentration of Eu3+ is up to 30 mol%. The theoretical quenching concentration and quenching mechanism were discussed herein. Moreover, the thermal quenching, CIE chromaticity coordinates, quantum yield, Judd-Ofelt analysis and energy transfer mechanism are discussed in detail.