Room-temperature phosphorescence of manganese-based metal halides

• Published in: Dalton transactions : an international journal of inorganic chemistry 2021-11, Vol.5 (46), p.17275-1728
• Main Authors: Zhang, Yue, Chen, Dian, Jin, Kai-Hang, Zang, Shuang-Quan, Wang, Qing-Lun
• Format: Article
• Language: English
• Subjects: Fluorescence; Halides; Hydrogen bonds; Luminous efficacy; Manganese; Melamine; Metal halides; Organic light emitting diodes; Phosphorescence; Photoluminescence; Quantum confinement; Room temperature
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d1dt03206b

Room-temperature phosphorescent (RTP) materials can be used in anti-counterfeiting, organic light-emitting diodes and displays. However, designing RTP materials with a long luminescence lifetime and high solid-state emission efficiency is still a challenge. Due to the strong quantum confinement effect and the hydrogen bond network structure formed by polyamino sites, 0D RTP materials usually have a higher fluorescence quantum yield and longer phosphorescence lifetime. Here, we synthesized four manganese-based metal halides of different dimensions with a long lifetime and high luminous efficiency by changing organic cations: {[H 2 DAP]MnCl 4 } n ( 1 , DAP = 1,3-propanediamine, 2D), {[(H 2 MELA) 2 MnCl 5 ]Cl} n ( 2 , MELA = melamine, 1D), [H 2 TAP] 2 MnCl 6 ( 3 , TAP = 2,4,6-triaminopyrimidine, 0D) and [H 2 MXD] 2 MnCl 6 ( 4 , MXD = m -xylylenediamine, 0D). [H 2 MXD] 2 MnCl 6 ( 4 ) has a long lifetime (11 ms) and the maximum photoluminescence quantum yield (31.05%). Our work provides a new procedure for the development of RTP materials with high quantum yields. Four manganese-based metal halides of different dimensions with a long lifetime and high luminous efficiency were synthesized by changing organic cations. From 2D to 0D, the luminescence efficiency and RTP lifetime of manganese halides were enhanced.