Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 27, Pages 8350-8356Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc02402f
Keywords
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Funding
- Region Midi-Pyrenees [MESR 13053031]
- BLAPHENE project - IDEX Toulouse, Emergence program, Programme des Investissements d'Avenir [ANR-11-IDEX-0002-02, ANR-10-LABX-0037-NEXT]
- Polish Ministry of Science and Higher Education within the Mobilnosc Plus program [1648/MOB/V/2017/0]
- National Science Centre Poland [2017/24/T/ST3/00257]
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/P033229/1]
- University college (Berman scholarship) at Oxford University
- Balliol college (J.T. Hamilton scholarship) at Oxford University
- STRABOT project - IDEX Toulouse, Emergence program, Programme des Investissements d'Avenir [ANR-11-IDEX-0002-02, ANR-10-LABX-0037-NEXT]
- EPSRC [EP/N01085X/1, EP/P033229/1, 1949700] Funding Source: UKRI
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Double perovskite crystals such as Cs2AgBiBr6 are expected to overcome the limitation of classic hybrid organic-inorganic perovskite crystals related to the presence of lead and the lack of structural stability. Perovskites are ionic crystals in which the carriers are expected to strongly couple to lattice vibrations. In this work we demonstrate that the photoluminescence (PL) emission in Cs2AgBiBr6 is strongly influenced by the strong electron-phonon coupling. Combining photoluminescence excitation (PLE) and Raman spectroscopy we show that the PL emission is related to a color center rather than a band-to-band transition. The broadening and the Stokes shift of the PL emission from Cs2AgBiBr6 is well explained using a Franck-Condon model with a Huang-Rhys factor of S = 11.7 indicating a strong electron-phonon interaction in this material.
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