Kinetics of Photoluminescence of CaGa2S4:Nd,Yb Crystals at Room Temperature

The photoluminescence (PL) spectra, PL excitation spectra (PLES) and kinetics of FL of micropowders of CaGa₂S₄:3%Nd,5%Yb and CaGa₂S₄:3%Nd compounds at room temperature were studied in a wide range of optical excitation levels. In the PL and PLES, the transition bands of Nd³⁺ ions in the wavelength range of 300–1500 nm were identified. It was found that due to doping of CaGa₂S₄:3%Nd crystals with ytterbium ions, an intense violet-green band with a maximum at about 488 nm appears in the PLES. When excited within this band, the PL intensities in the IR bands of neodymium increase by 2 orders of magnitude, and outside this band – by 1 order of magnitude compared to similar intensities of undoped crystal. In the PL kinetics, sections with increasing luminescence intensity over time were found, as well as sections with nonmonoexponential and monoexponential decay laws depending on the wavelength of the exciting light. The main observed regularities in the kinetics of PL decay of CaGa₂S₄:3%Nd,5%Yb are interpreted in the framework of nonradiative energy transfer (Förster Resonance Energy Transfer – FRET) using a mathematical model.

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