jz0c01933_si_003.cif (5.73 kB)
Unraveling the Near-Unity Narrow-Band Green Emission in Zero-Dimensional Mn2+-Based Metal Halides: A Case Study of (C10H16N)2Zn1–xMnxBr4 Solid Solutions
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posted on 2020-07-13, 22:44 authored by Guojun Zhou, Zhiyang Liu, Jinglong Huang, Maxim S. Molokeev, Zewen Xiao, Chonggeng Ma, Zhiguo XiaZero-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 0D metal halides enables all Mn2+ centers to emit spontaneously,
thereby leading to near-unity photoluminescence quantum yield. Taking
lead-free (C10H16N)2Zn1–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)2MnBr4 exhibits highly thermal stable luminescence
even up to 150 °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 Mn2+-based metal halides.