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Cs2NaBiCl6:Mn2+A New Orange-Red Halide Double Perovskite Phosphor

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journal contribution
posted on 30.01.2019, 00:00 by Jackson D. Majher, Matthew B. Gray, T. Amanda Strom, Patrick M. Woodward
In this work, we report on the promising photoluminescent behavior of the cubic double perovskite Cs2NaBiCl6 doped with Mn2+ ions. Localized excitations centered on Bi3+ ions in the host lattice strongly absorb near-UV light. In the undoped host compound, only very weak photoluminescence is observed, but in manganese-doped samples, energy transfer from Bi3+ to Mn2+ leads to intense orange-red photoluminescence. A broad emission peak centered at 590 nm is assigned to the 4T16A1 transition of octahedrally coordinated Mn2+. The excitation spectrum contains peaks at 294 and 354 nm that arise from 6s2 → 6s16p1 excitations of Bi3+ ions. If the chloride ions are partially replaced by bromide ions, the strongest excitation peak red-shifts to 375 nm. The lack of expensive reagents and toxic elements and the ability to tune the excitation and emission spectra through chemical substitution make Cs2NaBiCl6–xBrx:Mn2+ a promising phosphor system.