In present work, the luminescent YAG:Ce ceramics co-doped with variable compositions of rare earth ions (Dy3+, Tb3+, Eu3+) were obtained by uniaxial pressing methods. Comprehensive characterizations of the microstructure and phase composition of YAG ceramics has been carried out. Spectral-luminescent properties of sintered ceramics were investigated under different type of excitations. The temperature dependences of ceramics have been studied. It was revealed that when the YAG ceramics are heated in the temperature range of 0 – 150 °C, a slight change in the photoluminescence intensity is observed. The highest temperature resistance is demonstrated by YAG:Ce, Dy, and ceramics, the least YAG:Ce, Tb.
Mixed-alkali-alumina-borate glasses doped with different Cr2O3 content are prepared by conventional melt-quenching technique. Luminescent glass-ceramics is derived by volume crystallization of the precursor glass via two-stage heat treatment. The structural, spectral, and luminescent properties of the glass-ceramics are determined by X-ray diffraction, optical absorption, and photoluminescent spectroscopy. The XRD studies reveal the LiAl7B4O17: Cr3+ nanocrystals nucleation during the heat treatment. The photoluminescence spectra consist of three intense bands in the 685 – 715 nm region. The features and background of the complex concentration dependence of the luminescence lifetime are discussed. The maximum quantum yield value under 532 nm excitation is 41%.
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