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Crystal structure and luminescence properties of lead-free metal halides (C6H5CH2NH3)3MBr6 (M = Bi and Sb)

Journal Article · · Journal of Materials Chemistry C
DOI:https://doi.org/10.1039/d0tc00562b· OSTI ID:1777408
 [1];  [2];  [3];  [2];  [2];  [3];  [2];  [4]
  1. Univ. of Science and Technology Beijing (China); Northwestern University
  2. Univ. of Science and Technology Beijing (China)
  3. Northwestern Univ., Evanston, IL (United States)
  4. Univ. of Science and Technology Beijing (China); South China Univ. of Technology, Guangzhou (China)
Organic–inorganic hybrid metal halides have received extensive attention owing to their versatile structures and optoelectronic properties. Herein, we report two lead-free metal halides, (PMA)3BiBr6 and (PMA)3SbBr6 [PMA+: (C6H5CH2NH3)+, as the abbreviation of phenylmethylammonium], which possess iso-structural zero-dimensional structures and crystallize in the monoclinic space group P21/c. (PMA)3BiBr6 and (PMA)3SbBr6 exhibit optical band gaps of ~3.50 and 3.40 eV, respectively, and density functional theory calculations reveal their indirect bandgap behaviors. Upon 350 and 425 nm excitation, (PMA)3BiBr6 and (PMA)3SbBr6 exhibit broadband emission peaking at 510 nm and 625 nm with wide full-widths at half-maximum of ~153 and 175 nm, respectively. The emission mechanism of the metal halides is attributed to self-trapped exciton emission. The relationship between the crystal structure and luminescence intensity is also discussed. Lastly, both metal halides have high decomposition temperatures and are stable for long-term storage under ambient conditions, demonstrating their potential for optoelectronic applications.
Research Organization:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0014520
OSTI ID:
1777408
Alternate ID(s):
OSTI ID: 1632768
Journal Information:
Journal of Materials Chemistry C, Journal Name: Journal of Materials Chemistry C Journal Issue: 22 Vol. 8; ISSN 2050-7526
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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