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Indexed by:期刊论文

Date of Publication:2017-09-21

Journal:CRYSTENGCOMM

Included Journals:SCIE

Volume:19

Issue:35

Page Number:5214-5222

ISSN No.:1466-8033

Abstract:Ce3+ and Tb3+ co-doped SrAlF5 nanorods were synthesized via a mild hydrothermal method. The XRD results show that the prepared samples are single-phase. FE-SEM reveals the high uniformity of the as-synthesized nanorods (similar to 1 mu m in length and similar to 50 nm in diameter). The effect of reaction conditions on the morphology of SrAlF5 was studied. When excited at 254 nm, contrasting weak emission signals of SrAlF5: Tb3+ were observed, while SrAlF5: Ce3+, Tb3+ nanorods exhibited the strong green emission of Tb3+ ions. The energy transfer between Ce3+ and Tb3+ was observed and studied. The mechanism of energy transfer was deduced to be the electric dipole-dipole interaction in the SrAlF5 host. The optimum doping concentration of Ce3+ ions is 7 mol% in SrAlF5: 0.01Tb(3+). The fluorescence decay curves for Ce3+ and Tb3+ of SrAlF5: Ce3+, Tb3+ nanorods were measured at room temperature. The lifetime of Ce3+ is in the range from 78.6 to 1.2 ns and the lifetime of Tb3+ varies from 4.39 to 7.39 ms. The energy transfer efficiency from Ce3+ to Tb3+ was calculated using lifetime and emission spectra. The chromaticity coordinates of all the samples were calculated and the chromaticity coordinates of SrAlF5: 0.06Ce(3+), 0.01Tb(3+) are very near those of the European broadcasting union (EBU) primary green color (0.29, 0.60).