Lei Bohan, Lu Liping, Sun Haiying, Zhang Xiyan, Bai Zhaohui, Mi Xiaoyun
School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
Dalton Trans. 2023 Aug 22;52(33):11489-11502. doi: 10.1039/d3dt01603j.
In this study, up-conversion fluoride phosphors NaYMF:Er,Ho,Yb (M = Lu/Gd) were synthesized by a low-temperature combustion method. The optimal ionic ratios in the matrix lattice were also determined by a controlled variable method. It was confirmed that doping a small amount of Ho ions and Yb ions in the Er-doped sample matrix lattice can form a mutual sensitizer and a transient energy capture center to enhance the sample's up-conversion luminescence under excitation at the 1550 nm band, respectively. It was also found that the lanthanide ion introduced can modulate the red-to-green ratio of the up-conversion luminescence of the sample. The phase composition and morphology of phosphors were investigated using X-ray diffraction and scanning electron microscopy. The up-conversion luminescence mechanism of Er-Ho-Yb tri-doped samples excited at the 1550 nm band was also investigated. This work presents a novel approach for improving up-conversion luminescence with high color-purity phosphors for display lighting applications when excited at 1550 nm.
在本研究中，采用低温燃烧法合成了上转换氟化物荧光粉NaYMF:Er,Ho,Yb（M = Lu/Gd）。还通过控制变量法确定了基体晶格中的最佳离子比例。证实了在掺Er样品基体晶格中掺杂少量Ho离子和Yb离子可分别形成相互敏化剂和瞬态能量俘获中心，以增强样品在1550 nm波段激发下的上转换发光。还发现引入的镧系离子可调节样品上转换发光的红/绿比。利用X射线衍射和扫描电子显微镜研究了荧光粉的相组成和形貌。还研究了在1550 nm波段激发下Er-Ho-Yb三掺杂样品的上转换发光机制。这项工作提出了一种新颖的方法，用于在1550 nm激发下利用高色纯荧光粉改善用于显示照明应用的上转换发光。
