Resonant and non‐resonant energy transfer from Ce³⁺ → X (X = Tb³⁺, Eu³⁺ or Dy³⁺) in NaMgSO₄F material

Abstract

An inorganic NaMgSO F fluoride material was prepared by the wet chemical method and studied for its photoluminescence (PL) and resonant-non-resonant energy transfer (RET and NORET) capabilities between Ce → Tb , Ce → Eu and Ce → Dy rare earth ions. The Tb emission for Ce → Tb transfers under ultraviolet (UV) wavelengths peaked at 491, 547, and 586 nm, for excitation at 308 nm due to D → F (J = 4, 5, 6) transitions. Eu emission spectra were observed at 440 nm (Eu ), 593 nm and 616 nm (Eu ) recorded for different concentrations of materials, whereas Dy emission from Ce → Dy transfer under UV wavelengths peaked at 485 nm and 577 nm due to F → H and H transitions. The purpose of the present study is to understand the RET and NORET effects of Tb , Eu and Dy co-doping in a NaMgSO F:Ce luminescent material, which could be used as a green-emitting material for lamp phosphors.

Fixed Yellow-to-Blue Intensity Ratio of Dy3+ in KY(CO3)2 Host for Emission Color Tuning

“…The excitation intensity of KYC:3%Dy 3+ ,5%Ce 3+ in the range of 230–360 nm is significantly greater than that of KYC:3%Dy 3+ . This is primarily due to the overlap of energy levels between Ce 3+ and Dy 3+ , which promotes electron resonance migration [ 31 , 32 ]. The other excitation intensities of Dy 3+ at 428, 453, and 476 nm remain the same as before.…”