Journal
ACS ENERGY LETTERS
Volume 4, Issue 1, Pages 242-248Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b02239
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Funding
- National Natural Science Foundation of China [61675086, 61475062, 61722504, 51772123, 51702115]
- National Key Research and Development Program of China [2017YFB0403601]
- Special Project of the Province University Co-constructing Program of Jilin University [SXGJXX2017-3]
- Research Grants Council of Hong Kong S.A.R [CityU11337616]
- State Administration of Foreign Expert Affairs [MSBJLG040]
- Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
- BORSF Professorship
- [P20GM103424]
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Lead halide perovskites are important materials for solar cells and light emitting diodes (LEDs), but the toxicity of lead is a matter of concern for these and other commercial applications. Here, we demonstrate a lead-free two-dimensional (2D) Ruddlesden-Popper-type (C18H35NH3)(2)SnBr4 perovskite with a strong emission from the self-trapped states, whose photoluminescence quantum yields in colloidal suspension and in a film are 88 and 68%, respectively. The insulating character of the organic oleylamine cation prevents electronic band formation between the [SnBr6](4-) octahedron layers, which results in the Stokes-shifted orange emission. Electroluminescence of these 2D lead-free perovskite materials was demonstrated in an inverted LED structure with a low turn-on voltage of 2.2 V and a luminance of 350 cd/m(2).
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