High-efficiency blue photoluminescence in the Cs2NaInCl6:Sb3+ double perovskite phosphor

In this paper, the photoluminescent properties of a lead-free double perovskite Cs2NaInCl6 doped with Sb3+ are explored. The host crystal structure is a cubic double perovskite with Fm3m symmetry, a = 10.53344(4) Å, and rock salt ordering of Na+ and In3+. It is a wide bandgap compound (Eg ≈ 5.1 eV),...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2020-01, Vol.8 (20), p.6797-6803
Main Authors: Gray, Matthew B, Hariyani, Shruti, Strom, T Amanda, Majher, Jackson D, Brgoch, Jakoah, Woodward, Patrick M
Format: Article
Language:English
Subjects:
Coordination numbers
Crystal structure
Halites
Lead free
Perovskites
Phosphors
Photoluminescence
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Summary:In this paper, the photoluminescent properties of a lead-free double perovskite Cs2NaInCl6 doped with Sb3+ are explored. The host crystal structure is a cubic double perovskite with Fm3m symmetry, a = 10.53344(4) Å, and rock salt ordering of Na+ and In3+. It is a wide bandgap compound (Eg ≈ 5.1 eV), and substitution with Sb3+ leads to strong absorption in the UV due to localized 5s2 → 5s15p1 transitions on Sb3+ centers. Radiative relaxation back to the 5s2 ground state, via a 3P1 → 1S0 transition, leads to intense blue luminescence, centered at 445 nm, with a photoluminescent quantum yield of 79%. The Stokes shift of 0.94 eV is roughly 33% smaller than it is in the related vacancy ordered double perovskite Cs2SnCl6. The reduction in Stokes shift is likely due to a change in coordination number of Sb3+ from 6-coordinate in Cs2NaInCl6 to 5-coordinate in Cs2SnCl6. In addition to the high quantum yield, Cs2NaInCl6:Sb3+ exhibits excellent air/moisture stability and can be prepared from solution; these characteristics make it a promising blue phosphor for applications involving near-UV excitation.
ISSN:2050-7526
2050-7534
DOI:10.1039/d0tc01037e