YAO Chengfang ¹, WANG Minghui ¹, HUANG Ping ¹, FANG Hailiang ¹, WANG Haifeng ¹, JIANG Wan ¹
(1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China;
2. Analysis and Testing Center, Donghua University, Shanghai 201620, China)

Abstract: In this paper, Eu³⁺-doped LaF₃ (LaF₃ : Eu³⁺) phosphor was prepared by hydrothermal method, the structure and luminescent properties of the phosphor after annealing are systematically studied. The samples were tested by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and fluorescence spectroscopy (PL). When the temperature of annealing was 600 ℃, the LaF₃ hexagonal phase began to transform into the LaOF tetragonal phase; after annealing at 800 ℃, the LaF₃ crystals completely transformed into LaOF crystals, and LaOF : Eu³⁺ red phosphor was successfully prepared. Under the excitation light of 396 nm, the main emission peak of Eu³⁺ ions was 614 nm, and the emission color was red.

Key words: Eu³⁺ doping; LaOF; annealing; thermal stability; red phosphor