期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 11, 期 15, 页码 5956-5962出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c01933
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资金
- National Natural Science Foundations of China [51972118, 51961145101, 51722202]
- Fundamental Research Funds for the Central Universities [D2190980]
- Guangzhou Science & Technology Project [202007020005]
- Guangdong Provincial Science & Technology Project [2018A050506004]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]
- RFBR [19-5280003]
- Innovation and Entrepreneurship Programs for Returned Overseas Chinese Scholars [CX2019055]
- Thousand Young Talents Program of China
- Startup Fund of Huazhong University of Science and Technology
- Wuhan National Laboratory for Optoelectronics
Zero-dimensional (0D) Mn2+-based metal halides are potential candidates as narrow-band green emitters, and thus it is critical to provide a structural understanding of the photophysical process. Herein, we propose that a sufficiently long Mn-Mn distance in OD metal halides enables all Mn2+ centers to emit spontaneously, thereby leading to near-unity photoluminescence quantum yield. Taking lead-free (C10H16N)(2)Zn1-xMnxBr4 (x = 0-1) solid solution as an example, the Zn/Mn alloying inhibits the concentration quenching that is caused by the energy transfer of Mn2+. (C10H16N)(2)MnBr4 exhibits highly thermal stable luminescence even up to 150 degrees C with a narrow-band green emission at 518 nm and a full width at half maximum of 46 nm. The fabricated white light-emitting diode device shows a high luminous efficacy of 120 lm/W and a wide color gamut of 104% National Television System Committee standard, suggesting its potential for liquid crystal displays backlighting. These results provide a guidance for designing new narrow-band green emitters in Mn(2+)based metal halides.
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