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Albrecht K, Hisamura E, Furukori M, Nakayama Y, Hosokai T, Nakao K, Ikebe H, Nakayama A. Thermally Activated Delayed Fluorescence of Carbazole-Benzophenone Dendrimer with Bulky Substituents. Polym Chem 2022. [DOI: 10.1039/d2py00255h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carbazole dendrimers with benzophenone core and bulky terminal substituents were synthesized, and thermally-activated delayed fluorescence (TADF) property was investigated. The adamantane (Ad) substituted dendrimer showed green TADF emission with PLQY...
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Coluccini C, Anusha PT, Chen HYT, Liao SL, Ko YK, Yabushita A, Luo CW, Ng YM, Khung YL. Tuning of the Electro-Optical Properties of Tetraphenylcyclopentadienone via Substitution of Oxygen with Sterically-Hindered Electron Withdrawing Groups. Sci Rep 2019; 9:12762. [PMID: 31484973 PMCID: PMC6726659 DOI: 10.1038/s41598-019-49303-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 08/19/2019] [Indexed: 01/09/2023] Open
Abstract
In this report, the substitution of the oxygen group (=O) of Tetraphenylcyclopentadienone with =CR2 group (R = methyl ester or nitrile) was found to have tuned the electro-optical properties of the molecule. Although both groups are electrons withdrawing in nature, their absorption from UV-vis spectra analysis was observed to have been blue-shifted by methyl ester substitution and red-shifted by nitrile substitution. Interestingly, these substitutions helped to enhance the overall intensity of emission, especially in the context of methyl ester substitution whereby the emission was significantly boosted at higher concentrations due to hypothesized restrictions of intramolecular motions. These observations were explained through detailed descriptions of the electron withdrawing capability and steric properties of the substituents on the basis of density functional theory calculations.
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Affiliation(s)
- Carmine Coluccini
- Institute of New Drug Development, China Medical University, No.91 Hsueh-Shih Road, Taichung, 40402, Taiwan
| | - Puliparambil Thilakan Anusha
- Department of Electrophysics, National Chiao Tung University, 1001 University Road, Hsinchu, 30010, Taiwan
- Department of Physics, School of Advanced Sciences, Vellore Institute of Technology, Vellore, 632 014, India
| | - Hsin-Yi Tiffany Chen
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Sheng-Lun Liao
- Molecular Science Center, GGA Corp, Taipei, 11493, Taiwan
| | - Ying Kuan Ko
- Department of Electrophysics, National Chiao Tung University, 1001 University Road, Hsinchu, 30010, Taiwan
| | - Atsushi Yabushita
- Department of Electrophysics, National Chiao Tung University, 1001 University Road, Hsinchu, 30010, Taiwan
| | - Chih Wei Luo
- Department of Electrophysics, National Chiao Tung University, 1001 University Road, Hsinchu, 30010, Taiwan
- Taiwan Consortium of Emergent Crystalline Materials (TCECM), Ministry of Science and Technology, Taipei, Taiwan
| | - Yoke Mooi Ng
- Institute of New Drug Development, China Medical University, No.91 Hsueh-Shih Road, Taichung, 40402, Taiwan
| | - Yit Lung Khung
- Department of Biological Science and Technology, China Medical University, No.91 Hsueh-Shih Road, Taichung, 40402, Taiwan.
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