Kumar Pawan, Singh Devender, Gupta Isha, Singh Sitender, Nehra Simran, Kumar Ramesh
Department of Chemistry, Maharshi Dayanand University Rohtak-124001 Haryana India
CSIR-National Physical Laboratory Dr K. S. Krishnan Marg New Delhi-110012 India.
RSC Adv. 2023 Mar 8;13(12):7752-7765. doi: 10.1039/d3ra00735a.
Cool green light emanating monoclinic Y AlO:Tb ( = 1-5 mol%) nanophosphors have been fabricated through gel-combustion method. X-ray diffraction and transmission electron-microscopy data have been utilized to assess their structural and microstructural characteristics, including cell parameters and crystallite size. Uneven aggregation of nanoparticles in the nano-scale with distinctive porosity can be seen in the TEM micrograph. Kubelka-Munk model imitative diffuse reflectance spectra and an optical band gap of 5.67 eV for the YAlO:0.03Tb nanophosphor revealed high optical quality in the samples, which were thought to be non-conducting. The emission (PL) and excitation (PLE) spectra as well as lifetime measurements have been used to determine the luminescence characteristics of the synthesized nanophosphors. The emission spectra show two color blue color due to D → F ( = 4 and 5) transitions and green color due to D → F ( = 3, 4, 5 and 6) transitions. The most dominant transition (D → F) at 548 nm was responsible for the greenish color in focused nanocrystalline samples. Calculated colorimetric characteristics such as CIE, and CCT along with color purity of the synthesized nanocrystalline materials make them the best candidate for the solid-state lighting (SSL).
通过凝胶燃烧法制备了发出冷绿光的单斜晶系YAlO:Tb（=1 - 5摩尔%）纳米磷光体。利用X射线衍射和透射电子显微镜数据评估了它们的结构和微观结构特征，包括晶胞参数和微晶尺寸。在透射电子显微镜图像中可以看到纳米尺度下具有独特孔隙率的纳米颗粒不均匀聚集。YAlO:0.03Tb纳米磷光体的Kubelka - Munk模型模拟漫反射光谱和5.67 eV的光学带隙表明样品具有高光学质量，被认为是不导电的。发射（PL）和激发（PLE）光谱以及寿命测量已被用于确定合成纳米磷光体的发光特性。发射光谱显示出两种颜色，由于D→F（=4和5）跃迁产生蓝色，由于D→F（=3、4、5和6）跃迁产生绿色。在548 nm处最主要的跃迁（D→F）导致了聚焦纳米晶体样品中的绿色。计算得到的比色特性，如CIE和CCT以及合成纳米晶体材料的色纯度，使其成为固态照明（SSL）的最佳候选材料。
