1. Molecular Persistent Room-Temperature Phosphorescence from Tetraarylaminoboranes.
- Author
-
Nandi RP, Kalluvettukuzhy NK, Pagidi S, and Thilagar P
- Subjects
- Temperature, Fluorescence, Density Functional Theory, Luminescence
- Abstract
Herein, we report the synthesis, molecular structure, and optical features of tetrarylaminoboranes 1 (Mes
2 B-N(Ph)(C10 H7 )) and 2 (Mes2 B-N(Ph)(C14 H9 )). In the solution state, 1 shows aggregation-induced emission enhancement and color switching, while 2 displays emission color switching and aggregation-caused quenching. At 77 K, frozen solutions of 1 show delayed fluorescence (DF) and phosphorescence, whereas 2 display only DF. Pristine solids of 1 and 2 showed delayed fluorescence under ambient conditions; however, crystals of both compounds show no phosphorescence under similar conditions. Polymethyl methacrylate thin films of 1 (1 wt % doping concentration) exhibit persistent room-temperature phosphorescence (pRTP) lasting for ∼0.5 s. In contrast, 2 does not show phosphorescence under similar conditions. Systematic photophysical studies and theoretical (DFT and TD-DFT) calculations are performed on these molecules to rationalize their intriguing optical characteristics.- Published
- 2023
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