Metal Halide Regulated Photophysical Tuning of Zero-Dimensional Organic Metal Halide Hybrids: From Efficient Phosphorescence to Ultralong Afterglow |
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| Authors: | Dr. Liang-Jin Xu Anna Plaviak Dr. Xinsong Lin Michael Worku Dr. Qingquan He Maya Chaaban Prof. Bumjoon J. Kim Prof. Biwu Ma |
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| Affiliation: | 1. Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306 USA;2. Materials Science and Engineering Program, Florida State University, Tallahassee, FL, 32306 USA;3. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141 Republic of Korea |
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| Abstract: | The photophysical tuning is reported for a series of tetraphenylphosphonium (TPP) metal halide hybrids containing distinct metal halides, TPP2MXn (MXn=SbCl5, MnCl4, ZnCl4, ZnCl2Br2, ZnBr4), from efficient phosphorescence to ultralong afterglow. The afterglow properties of TPP+ cations could be suspended for the hybrids containing low band gap emissive metal halide species, such as SbCl52− and MnCl42−, but significantly enhanced for the hybrids containing wide band gap non-emissive ZnCl42−. Structural and photophysical studies reveal that the enhanced afterglow is attributed to stronger π–π stacking and intermolecular electronic coupling between TPP+ cations in TPP2ZnCl4 than in the pristine organic ionic compound TPPCl. Moreover, the afterglow in TPP2ZnX4 can be tuned by controlling the halide composition, with the change from Cl to Br resulting in a shorter afterglow due to the heavy atom effect. |
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| Keywords: | afterglow heavy atom effect organic–metal halide hybrids phosphorescence zero-dimensional materials |
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