Arumugam, R and Muhammed Munthasir, AT and Kannan, R and Banerjee, D and Sudhakar, P and Soma, VR and Thilagar, P and Chandrasekhar, V (2024) Regioisomers containing triarylboron-based motifs as multi-functional photoluminescent materials: from dual-mode delayed emission to pH-switchable room-temperature phosphorescence. In: Chemical Science .
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Abstract
Triarylboron compounds have been established as promising candidates in optoelectronic applications. However, realizing multi-functional properties in triaryl boron-based materials remains challenging. Herein, we present two regioisomers, 1 and 2, designed judiciously by connecting a dimethylamino donor and a dimesitylboryl acceptor at 1,4 and 2,6-positions of the naphthalene spacer, respectively. Both compounds 1 and 2 display simultaneous, delayed fluorescence and persistent room-temperature phosphorescence (580 nm, �av = 168 ms, Φ = 76 for 1; 550 nm, �av = 129 ms, Φ = 88 for 2 in 1 wt PMMA), with the delayed fluorescence bands being sensitive to doping concentration (in PMMA). Notably, compound 1 in 1 wt PMMA films demonstrates a reversibly switchable single-molecule phosphorescence from orange (580 nm) to green (λPh = 550 nm, �av = 42 ms) in response to pH, which can be utilized for anti-counterfeiting applications. These results were further corroborated by studying the respective cationic salts 1-OTF and 2-OTF. Moreover, 1 and 2 exhibited blue-shifted fluorescence in response to mechanical pressure. Compound 2 also showed three-photon (�3P) absorption properties which were better compared to those of compound 1. © 2024 The Royal Society of Chemistry.
| Item Type: | Journal Article |
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| Publication: | Chemical Science |
| Publisher: | Royal Society of Chemistry |
| Additional Information: | The copyright for this article belongs to the authors. |
| Keywords: | Blue shift; Naphthalene; Phosphorescence; Phosphors; Photoluminescence; Semiconductor doping, Delayed fluorescence; Dual modes; Fluorescence band; Functional properties; Multi-functional; Optoelectronic applications; Photoluminescent materials; Regioisomers; Room temperature phosphorescence; Switchable, Fluorescence |
| Department/Centre: | Division of Chemical Sciences > Inorganic & Physical Chemistry |
| Date Deposited: | 14 Nov 2024 21:19 |
| Last Modified: | 14 Nov 2024 21:19 |
| URI: | http://eprints.iisc.ac.in/id/eprint/86859 |
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