Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 29, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201801131
Keywords
blue emission; impurity doping; lead-free; perovskite
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Funding
- National Natural Science Foundation of China [5171101030, 61725401]
- National Key R&D Program of China [2016YFB0700702]
- HUST Key Innovation Team for Interdisciplinary Promotion [2016JCTD111, 2017KFXKJC003]
- MEXT Elements Strategy Initiative to Form Core Research Center
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Lead halide perovskites show excellent optoelectronic properties but are unsatisfactory in terms of stability and toxicity. Herein, bismuth (Bi)-doped lead-free inorganic perovskites Cs2SnCl6:Bi are reported as blue emissive phosphors. Upon Bi doping, the originally nonluminous Cs2SnCl6 exhibits a highly efficient deep-blue emission at 455 nm, with a Stokes shift of 106 nm and a high photoluminescence quantum yield (PLQY) close to 80%. Hybrid density functional theory calculations suggest the preferred formation of [Bi-Sn+V-Cl] defect complex, which is believed to be responsible for the optical absorption and the associated blue emission. The Cs2SnCl6:Bi also shows impressive thermal and water stability due to its inorganic nature and the formation of protective BiOCl layer. White light-emitting diodes (LEDs) are constructed using Cs2SnCl6:Bi and commercial yellow phosphors combined with commercial UV LED chips, giving the Commission Internationale de I'Eclairage (CIE) color coordinates of (0.36, 0.37). This work represents a significant step toward the realization of highly efficient, stable, and environmentally benign next-generation solid-state lighting.
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