Crystal growth and visible fluorescence and energy transfer features of Dy3+/RE3+ (RE = Tb, Eu)-codoped Y3Al5O12 crystals

Abstract

In this work, 4 at% Dy3+: YAG (Dy: YAG), 4 at% Dy3+/0.5 at% Tb: YAG (Dy/Tb: YAG), 4 at% Dy3+/0.5 at% Eu3+: YAG (Dy/Eu: YAG), 0.5 at% Tb: YAG (Tb: YAG), and 0.5 at% Eu3+: YAG (Eu: YAG) crystals have been synthesized by the Czochralski method. Optical absorption and luminescence spectra of Dy: YAG, Dy/Tb: YAG, and Dy/Eu: YAG crystals are contrasted and discussed. Through emission decay times of Dy3+: 4F9/2 level in related crystals and the fluorescence spectra under different excitations, the energy transfer pathways between Dy3+ and Tb3+, and Dy3+ and Eu3+ ions are explored. Additionally, Judd-Ofelt analysis is performed to estimate distinct spectroscopic factors like radiative transition rates, fluorescence branching ratios, and radiative lifetimes. © 2022 Elsevier B.V.