Synthesis and Characterizations of Novel bi-ligand TbEu(cpioa)phen Phosphors with High Quantum Efficiency for WLED Applications

Qianwei Wang; Qi Wu; Jinhu Guo; Xinyu Yang; Mengxuan Fang; Jiaoying Wang; Minghui Tai; Yichong Cheng; Dalai Jin; Longcheng Wang

doi:10.1007/s10895-024-03927-y

Synthesis and Characterizations of Novel bi-ligand TbEu(cpioa)phen Phosphors with High Quantum Efficiency for WLED Applications

J Fluoresc. 2024 Sep 25. doi: 10.1007/s10895-024-03927-y. Online ahead of print.

Authors

Affiliations

¹ School of Materials Science and Engineering, Zhejiang Sci-Tech University, Xiasha Town, Hangzhou, 310018, PR China.
² School of Materials Science and Engineering, Zhejiang Sci-Tech University, Xiasha Town, Hangzhou, 310018, PR China. wlongcheng@zstu.edu.cn.

PMID: 39320630
DOI: 10.1007/s10895-024-03927-y

Abstract

The hydrothermal method was employed to synthesize a novel bi-ligands LnMOF: Ln(cpioa)phen. The secondary ligand 1, 10-phen serves as a bridging agent to further facilitate energy transfer between Ln ions and the primary ligand H₃cpioa. A comparison between Ln(cpioa) MOFs (Ln: Tb³⁺, Eu³⁺) and Ln(cpioa)phen MOFs (Ln: Tb³⁺, Eu³⁺) reveals that addition of the secondary ligand significantly improves the emission intensity by as high as almost 34 times. After detailed structural study, it is found that different Ln ions have the similar coordination in the Ln(cpioa)phen MOF. In addition, the chromaticity of Ln(cpioa)phen MOFs can be easily tuned by the amounts of doping Ln ions. La_0.974Tb_0.0255Eu_0.0005(cpioa)phen MOF has a white emission with a CIE coordinate of (0.323, 0.343). Characterizations of corresponding LED devices show that device based on Ln(cpioa)phen MOF has better photoluminescence performances, which indicates that Ln(cpioa)phen MOF has great potential of for WLED applications.

Keywords: Antenna effect; Bi-ligand; Lanthanide ions MOFs; WLED.