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题名: Pd-Porphyrin Oligomers Sensitized for Green-to-Blue Photon Upconversion: The More the Better?
作者: Xun, Zhiqing1; Zeng, Yi1; Chen, Jinping1; Yu, Tianjun1; Zhang, Xiaohui1; Yang, Guoqiang2; Li, Yi1
关键词: energy transfer ; light harvesting ; sensitizers ; triplet-triplet annihilation ; upconversion
刊名: CHEMISTRY-A EUROPEAN JOURNAL
发表日期: 2016-06-13
卷: 22, 期:25, 页:8654-8662
收录类别: SCI
英文摘要: A series of directly meso-meso-linked Pd-porphyrin oligomers (PdDTP-M, PdDTP-D, and PdDTP-T) have been prepared. The absorption region and the light-harvesting ability of the Pd-porphyrin oligomers are broadened and enhanced by increasing the number of Pd-porphyrin units. Triplet-triplet annihilation upconversion (TTA-UC) systems were constructed by utilizing the Pd-porphyrin oligomers as the sensitizer and 9,10-diphenylanthracene (DPA) as the acceptor in deaerated toluene and green-to-blue photon upconversion was observed upon excitation with a 532 nm laser. The triplet-triplet annihilation upconversion quantum efficiencies were found to be 6.2 %, 10.5 %, and 1.6% for the [PdDTP-M]/DPA, [PdDTP-D]/DPA, and [PdDTP-T]/DPA systems, respectively, under an excitation power density of 500 m Wcm(-2). The photophysical processes of the TTA-UC systems have been investigated in detail. The higher triplet-triplet annihilation upconversion quantum efficiency observed in the [PdDTP-D]/DPA system can be rationalized by the enhanced light-harvesting ability of PdDTP-D at 532 nm. Under the same experimental conditions, the [PdDTP-D]/DPA system produces more 3DPA* than the other two TTA-UC systems, benefiting the triplet-triplet annihilation process. This work provides a useful way to develop efficient TTA-UC systems with broad spectral response by using Pd-porphyrin oligomers as sensitizers.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35194
Appears in Collections:光化学实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Key Lab Photochem Convers & Optoelect Mat, Tech Inst Phys & Chem, Chinese Acad Sci Univ, Beijing 100190, Peoples R China
2.Chinese Acad Sci, BNLMS, Key Lab Photochem, Inst Chem,Chinese Acad Sci Univ, Beijing 100190, Peoples R China
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