期刊
DYES AND PIGMENTS
卷 150, 期 -, 页码 158-164出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2017.11.059
关键词
Multicomponent garnet; Red phosphors; Europium ions; Luminescence; Raman spectra
资金
- Government of the Russian Federation through the ITMO Post-Doctoral Fellowship scheme [074-U01]
- RFBR [16-53-76027ERA_a (ID 286)]
Novel multicomponent garnet phosphors, Ca2Y1-xEuxSc2GaSi2O12 (x = 0, 0.05, 0.1, 0.25 and 0.5), have been synthesized by a high-temperature solid-state reaction method using the precursors obtained under hydrothermal conditions. Their structures, morphology and vibronic properties have been studied by XRD, SEM methods and Raman spectroscopy. It has been found that ceramic phosphor pellets consist of microcrystals having a narrow size distribution and a mean size of 1 mu m with a maximum phonon energy of 864 cm(-1) for the crystal lattice of these compositions. Under UV and blue excitation, Eu3+:Ca2YSc2GaSi2O12 phosphors exhibit red f-f luminescence of Eu3+ ions at the distorted D2 site of the garnet structure and broadband blue and red emissions centered at similar to 417 nm, 600 nm and 770 nm as ascribed to the defects of the garnet host. The quantum yield of luminescence reaches 26% for Ca2Y0.75Eu0.25Sc2GaSi2O12. The spectroscopic properties of Eu3+ ions have been characterized with the Judd-Ofelt (J-O) theory and luminescence decay studies. The J-O parameters are Omega(2) = 2.212, Omega(4) = 2.888, and Omega(6) = 2.259 [10(-20) m(2)] and the luminescence quantum efficiency for Eu3+ ions eta(q) is 83% in Ca2Y0.95Eu0.05Sc2GaSi2O12. The developed materials are promising as color-tunable phosphors.
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