Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, P. R. China.
Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, P. R. China.
Dalton Trans. 2023 Jul 4;52(26):9068-9076. doi: 10.1039/d3dt00609c.
In this work, we prepared a new orange-red phosphor LiLaTiTaO:Sm (abbreviated as LLTT:Sm) for white light-emitting diodes (w-LEDs). Its crystal structure, microstructure, photoluminescence characteristics, luminescence lifetime and thermal quenching properties were studied in depth. The LLTT:Sm phosphor shows four intense emission peaks at 563, 597, 643, and 706 nm when excited at 407 nm. Thermal quenching is caused by the dipole-quadrupole (d-q) interaction of Sm ions, and the optimum doping concentration of Sm is = 0.05. Meanwhile, the LLTT:0.05Sm phosphor has a high overall quantum yield (QY = 59.65%) and almost no thermal quenching. The emission intensity at 423 K is 101.5% of the initial value at 298 K, while the CIE chromaticity coordinates barely change as the temperature rises. The fabricated white LED device exhibits excellent CRI and CCT values of 90.4 and 5043 K, respectively. These findings demonstrate that the LLTT:Sm phosphor has promise in w-LED applications.
在这项工作中，我们制备了一种新型的橙红色荧光粉 LiLaTiTaO:Sm（简称 LLTT:Sm），用于白光发光二极管（w-LEDs）。深入研究了其晶体结构、微观结构、光致发光特性、荧光寿命和热猝灭特性。当用 407nm 激发时，LLTT:Sm 荧光粉在 563、597、643 和 706nm 处显示出四个强发射峰。热猝灭是由 Sm 离子的偶极-四极（d-q）相互作用引起的，Sm 的最佳掺杂浓度为 = 0.05。同时，LLTT:0.05Sm 荧光粉具有较高的总量子效率（QY = 59.65%）和几乎没有热猝灭。在 423K 时的发射强度是 298K 时初始值的 101.5%，而 CIE 色度坐标随着温度的升高几乎没有变化。所制备的白光 LED 器件表现出优异的 CRI 和 CCT 值，分别为 90.4 和 5043K。这些发现表明 LLTT:Sm 荧光粉在 w-LED 应用中有很大的应用前景。
