Design Principles for Enhancing Photoluminescence Quantum Yield in Hybrid Manganese Bromides.

Journal of the American Chemical Society
Lingling MaoRam Seshadri

Abstract

Hybrid manganese halides have attracted widespread attention because of their highly emissive optical properties. To understand the underlying structural factors that dictate the photoluminescence quantum yield (PLQY) of these materials, we report five new hybrid manganese bromides with the general formula AmMnBr4 [m = 1 or 2, A = dimethylammonium (DMA), 3-methylpiperidinium (3MP), 3-aminomethylpiperidinium (3AMP), heptamethylenimine (HEP), and trimethylphenylammonium (TMPEA)]. By studying the crystal structures and optical properties of these materials and combining our results with the findings from previously reported analogs, we have found a direct correlation between Mn···Mn distance and the PLQY, where high PLQYs are associated with long Mn···Mn distances. This effect can be viewed as a manifestation of the concentration-quenching effect, except these are in stoichiometric compounds with precise interatomic distances rather than random alloys. To gain better separation of the Mn centers and prevent energy transfer, a bulky singly protonated cation that avoids H-bonding is ideal. We have demonstrated this principle in one of our newly reported material, (TMPEA)2MnBr4, where a PLQY of 70.8% for a powder sample and 98% for a...Continue Reading

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Citations

Jan 6, 2021·Chemical Society Reviews·Mingze Li, Zhiguo Xia
Feb 2, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Yang-Peng LinKe-Zhao Du
Feb 24, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Zhi-Zhuan ZhangXiao-Ying Huang
Jun 22, 2021·Chemical Communications : Chem Comm·Hong-Mei PanXiao-Wu Lei
Jul 31, 2021·The Journal of Physical Chemistry Letters·Pengfei FuZewen Xiao

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