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• W2997357265 abstract "Abstract Garnet‐type Li 6 Ca(La 0.97 Yb 0.02 RE 0.01 ) 2 Nb 2 O 12 (RE = Ho, Er, Tm) new phosphors were successfully synthesized via solid reaction at 900°C for 5 hours, whose course of phase evolution, macroscopic/local crystal structure and up‐/down‐conversion (UC/DC) photoluminescence were clarified. Mechanistic study and materials characterization were attained via XRD, Rietveld refinement, DTA/TG, electron microscopy (FE‐SEM/TEM), and Raman/reflectance/fluorescence spectroscopies. The phosphors were shown to exhibit UC luminescence dominated by a ~ 553 nm green band ( 5 F 4 / 5 S 2 → 5 I 8 transition) for Ho 3+ , a ~ 568 nm green band ( 4 S 3/2 → 4 I 15/2 transition) for Er 3+ and a ~ 806 nm near‐infrared band ( 3 H 4 → 3 H 6 transition) for Tm 3+ under 978 nm laser excitation, with CIE chromaticity coordinates of around (0.31, 0.68), (0.38, 0.60) and (0.17, 0.24), respectively. Analysis of the pump‐power dependence of UC intensity indicated that all the emissions involve a two‐photon mechanism except for the ~ 486 nm blue emission of Tm 3+ ( 1 G 4 → 3 H 6 ), which requires a three‐photon process. The DC luminescence of these phosphors is featured by dominant bands at ~ 553 nm for Ho 3+ (green, 5 F 4 / 5 S 2 → 5 I 8 transition), ~568 nm for Er 3+ (green, 4 S 3/2 → 4 I 15/2 transition) and ~ 464 nm for Tm 3+ (blue, 1 D 2 → 3 F 4 transition). The UC and DC properties were also comparatively discussed." @default.
• W2997357265 created "2020-01-10" @default.
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• W2997357265 date "2020-01-06" @default.
• W2997357265 modified "2023-10-16" @default.
• W2997357265 title "Phase evolution, structure, and up‐/down‐conversion luminescence of Li ₆ CaLa ₂ Nb ₂ O ₁₂ :Yb ³⁺ /RE ³⁺ phosphors (RE = Ho, Er, Tm)" @default.
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• W2997357265 doi "https://doi.org/10.1111/jace.16977" @default.
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