Study on white-light emission and light-emitting mechanism of hydrothermally synthesized YVO₄:1 mol.%Dy³⁺,x mol.%Eu³⁺ phosphor powders

刘红涛¹，梁艳²，郜小勇¹，张飒¹

1. Key Laboratory of Materials Physics of Ministry of Education of China, School of Physics and Engineering, Zhengzhou University2. College of Information Science and Engineering, Henan University of Technology

摘 要：White light-emitting YVO₄:1 mol.%Dy³⁺,x mol.%Eu³⁺ phosphor powders with order morphology and well crystallization were hydrothermally synthesized at 180°C. The microstructure, white-light emission, and light-emitting mechanism of the powders were carefully studied using X-ray diffractometry, scanning electron microscopy and photoluminescence spectra. The excitation and emission spectra of the phosphor powders indicated the coexistence of efficient energy transfer from Eu³⁺ to Dy³⁺ and inefficient energy transfer from Dy³⁺ to Eu³⁺ besides the energy transfer from VO₄^3– to Eu³⁺. Increasing the Eu³⁺ concentration initially enhanced and then weakened the luminescent intensity of Dy³⁺. The white-light emissions of YVO₄:1 mol.%Dy³⁺,x mol.%Eu³⁺ phosphor powders were both related to the energy transfer between VO₄^3– and Dy³⁺/Eu³⁺, as well as between Eu³⁺ and Dy³⁺. The inefficient energy transfer from Dy³⁺ to Eu³⁺ was first found.

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