Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 40, Pages 34363-34369Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b07673
Keywords
tin perovskite; layered; broadband emission; self-trapped exciton; WLED
Funding
- ShanghaiTech University, the Thousand Youth Talents Plan [21571129]
- Shanghai Key Research Program [16JC1402100]
- National Natural Science Foundation of China [21571129, 51572128, U1632118]
- National Key Research Program [2016YFA0204000]
- Shanghai International Cooperation Project [16520720700]
- NSFC [61574059, 61722402]
- National Key Research and Development Program of China [2016YFB0700700]
- CC of ECNU
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Recently, layered perovskites attracted great attention for its excellent stability and light-emitting property. However, most of them rely on the toxic element lead and their emission quantum yields are generally low. Here, a unique hollow two-dimensional perovskite was developed in which the organic hexamethylene diamines (C6H18N22+) strongly coupled with distorted tin bromide anions (SnBr64-). This toxic-free low-dimensional tin perovskite exhibits a broadband emission in the visible region with a high luminescence quantum yield of 86%. First-principles calculation indicate the broadband emission is associated with the recombination of self-trapped excitons. And the emission is related to the geometry of tin bromide anions. An ultraviolet light-pumped white light emitting diode with excellent color-rendering index of 94 was fabricated using it together with a commercially available blue phosphor.
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