Preparation and luminescent properties of novel color-tunable Gd2O(CO3)2·H2O∶Tb3+,Eu3+phosphor
To investigate the multi-color luminescence mechanism of new fluorescent materials,Gd2O(CO3)2·H2O co-doped with Tb3+and Eu3+was synthesized using the hydrothermal method.This study employed techniques including X-ray diffraction,fluorescence spectroscopy,and fluorescence lifetimes to analyze excited state electrons'phase structure,luminescent properties,and decay process.The results revealed that when excited by 367 nm ultraviolet light,Gd2O(CO3)2·H2O∶Tb3+emitted high-intensity green light,peaking at 541 nm.However,when Eu3+was introduced to Gd2O(CO3)2·H2O∶Tb3+,the luminescence intensity of Tb3+decreased,while that of Eu3+increased,which was attributed to the energy transfer phenomenon between Tb3+and Eu3+.At a Eu3+doping concentration of 0.05,the luminescent color of the sample appeared yellow,with chromaticity coordinates of(0.459 1 and 0.484 6).The fluorescence decay curve test indicated that the 5D4 lifetime of Tb3+in Gd2 O(CO3)2·H2O∶Tb3+,Eu3+diminished as the concentration of Eu3+enhanced.When the Eu3+doping concentration exceeded 0.2,the Tb3+emission intensity in the sample was almost zero,and the enhancement of Tb3+emission intensity towards red light was limited,which suggested that high concentration co-doping of Tb3+and Eu3+in the Gd2O(CO3)2·H2O matrix would accelerate the concentration quenching of Eu3+.
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