Energy Transfer Dynamics in Triplet-Triplet Annihilation Upconversion Using a Bichromophoric Heavy-Atom-Free Sensitizer

doi:10.1021/acs.jpca.8b05901

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	Energy Transfer Dynamics in Triplet-Triplet Annihilation Upconversion Using a Bichromophoric Heavy-Atom-Free Sensitizer
	Chen, Qi 1; Liu, Yiming 1; Guo, Xinyan 1; Peng, Jiang 1; Garakyaraghi, Sofia 2; Papa, Christopher M.2; Castellano, Felix N.2; Zhao, Dahui 1; Ma, Yuguo 1
刊名	JOURNAL OF PHYSICAL CHEMISTRY A
	2018-08-23
卷号	122 期号:33 页码:6673-6682
ISSN号	1089-5639
DOI	10.1021/acs.jpca.8b05901
英文摘要	A heavy-atom-free triplet sensitizer suitable for triplet-triplet annihilation-based photon upconversion was developed from the thermally activated delayed fluorescence (TADF) molecule 4CzPN by covalently tethering a pyrene derivative (DBP) as a triplet acceptor. The triplet exciton produced by 4CzPN is captured by the intramolecular pyrenyl acceptor and subsequently transferred via intermolecular triplet triplet energy transfer (TTET) to freely diffusing pyrenyl acceptors in toluene. Transient absorption and time-resolved photoluminescence spectroscopy were employed to examine the dynamics of both the intra- and intermolecular TTET processes, and the results indicate that the intramolecular energy transfer from 4CzPN to DBP is swift, quantitative, and nearly irreversible. The reverse intersystem crossing is suppressed while intersystem crossing remains efficient, achieving high triplet yield and long triplet lifetime simultaneously. The ultralong excited state lifetime characteristic of the DBP triplet was shown to be crucial for enhancing the intermolecular TTET efficiency and the subsequent triplet-triplet annihilation photochemistry. It was also demonstrated that with the long triplet lifetime of the tethered DBP, TTET was enabled under low free acceptor concentrations and/or with sluggish molecular diffusion in polymer matrixes.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000442959500003
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/42361]
专题	中国科学院化学研究所
通讯作者	Castellano, Felix N.; Zhao, Dahui; Ma, Yuguo
作者单位	1.Peking Univ, Ctr Soft Matter Sci & Engn, Key Lab Polymer Chem & Phys, BNLMS,Minist Educ,Coll Chem, Beijing 100871, Peoples R China 2.North Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA
推荐引用方式 GB/T 7714	Chen, Qi,Liu, Yiming,Guo, Xinyan,et al. Energy Transfer Dynamics in Triplet-Triplet Annihilation Upconversion Using a Bichromophoric Heavy-Atom-Free Sensitizer[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2018,122(33):6673-6682.
APA	Chen, Qi.,Liu, Yiming.,Guo, Xinyan.,Peng, Jiang.,Garakyaraghi, Sofia.,...&Ma, Yuguo.(2018).Energy Transfer Dynamics in Triplet-Triplet Annihilation Upconversion Using a Bichromophoric Heavy-Atom-Free Sensitizer.JOURNAL OF PHYSICAL CHEMISTRY A,122(33),6673-6682.
MLA	Chen, Qi,et al."Energy Transfer Dynamics in Triplet-Triplet Annihilation Upconversion Using a Bichromophoric Heavy-Atom-Free Sensitizer".JOURNAL OF PHYSICAL CHEMISTRY A 122.33(2018):6673-6682.