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Yang Y, Jiang Z, Liu Y, Guan T, Zhang Q, Qin C, Jiang K, Liu Y. Transient Absorption Spectroscopy of a Carbazole-Based Room-Temperature Phosphorescent Molecule: Real-Time Monitoring of Singlet-Triplet Transitions. J Phys Chem Lett 2022; 13:9381-9389. [PMID: 36190283 DOI: 10.1021/acs.jpclett.2c02519] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Real-time monitoring of singlet-triplet transitions is an effective tool for studying room-temperature phosphorescent molecules. For femtosecond transient absorption (TA) spectroscopy of a 2,6-di(9H-carbazol-9-yl) pyridine molecule in dimethyl sulfoxide (DMSO), the stimulated emission signal (380 nm) and the excited-state absorption signal (650 nm) reach their maximum intensity within 397 fs. Subsequently, the two signals decay with time and the triplet-triplet absorption (TTA) signal (400 nm) is enhanced synchronously, accompanied by an isosbestic point at 491 nm. These results confirm intersystem crossing (ISC) within 2.5 ns. Moreover, the TTA signal (400 nm) in nanosecond TA spectroscopy gradually disappeared, accompanied by a phosphorescence lifetime of 4.1 μs. As the solvent polarity decreases (DMSO > N,N-dimethylformamide > 1,4-dioxane > toluene), similar spectral dynamic processes are observed, while the durations of ISC processes and phosphorescence lifetimes are shortened. This combined femtosecond and nanosecond transient absorption spectroscopy study presents the ultrafast excited-state dynamics of organic phosphorescent molecules.
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Affiliation(s)
- Yonggang Yang
- Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, School of Environment, Henan Normal University, 46# East of Construction Road, Xinxiang 453007, Henan, China
| | - Zhinan Jiang
- Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, School of Environment, Henan Normal University, 46# East of Construction Road, Xinxiang 453007, Henan, China
| | - Yang Liu
- Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, School of Environment, Henan Normal University, 46# East of Construction Road, Xinxiang 453007, Henan, China
| | - Tiantian Guan
- Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, School of Environment, Henan Normal University, 46# East of Construction Road, Xinxiang 453007, Henan, China
| | - Qi Zhang
- Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, School of Environment, Henan Normal University, 46# East of Construction Road, Xinxiang 453007, Henan, China
| | - Chaochao Qin
- Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, School of Environment, Henan Normal University, 46# East of Construction Road, Xinxiang 453007, Henan, China
| | - Kai Jiang
- Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, School of Environment, Henan Normal University, 46# East of Construction Road, Xinxiang 453007, Henan, China
| | - Yufang Liu
- Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, School of Environment, Henan Normal University, 46# East of Construction Road, Xinxiang 453007, Henan, China
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Li XC, Yuan QL, Zhang F, Zhang HZ. Investigation of intrachain exciton diffusion of MEH-PPV in solution with different polarity. CHINESE J CHEM PHYS 2019. [DOI: 10.1063/1674-0068/cjcp1806134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Xue-cong Li
- Department of Physics, Tianjin Polytechnic University, TianJin 300387, China
| | - Qi-lin Yuan
- Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, China
| | - Fang Zhang
- Department of Physics, Tianjin Polytechnic University, TianJin 300387, China
| | - Han-zhuang Zhang
- Femtosecond laser laboratory, College of Physics, Jilin University, Changchun 130012, China
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Wang ML, Fan JZ, Lin LL. Influence of electron donating ability on reverse intersystem crossing rate for one kind of thermally activated delayed fluorescence molecules. CHINESE J CHEM PHYS 2018. [DOI: 10.1063/1674-0068/31/cjcp1710191] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Ming-lang Wang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
- Department of Electronics, Peking University, Beijing 100871, China
| | - Jian-zhong Fan
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
| | - Li-li Lin
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
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