New Anthracene Derivatives as Triplet Acceptors for Efficient Green‐to‐Blue Low‐Power Upconversion |
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| Authors: | Dr Zuo‐Qin Liang Bin Sun Dr Chang‐Qing Ye Prof Xiao‐Mei Wang Prof Xu‐Tang Tao Prof Qin‐Hua Wang Ping Ding Bao Wang Jing‐Jing Wang |
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| Institution: | 1. Jiangsu Key Laboratory for Environment Function Materials, School of Chemistry, Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou, 215009 (PR China), Fax: (+86)?512‐68326615;2. State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100 (PR China);3. Institute of Modern Optical Technologies, Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, 215006 (PR China) |
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| Abstract: | Three new anthracene derivatives 2‐chloro‐9,10‐dip‐tolylanthracene (DTACl), 9,10‐dip‐tolylanthracene‐2‐carbonitrile (DTACN), and 9,10‐di(naphthalen‐1‐yl)anthracene‐2‐carbonitrile (DNACN)] were synthesized as triplet acceptors for low‐power upconversion. Their linear absorption, single‐photon‐excited fluorescence, and upconversion fluorescence properties were studied. The acceptors exhibit high fluorescence yields in DMF. Selective excitation of the sensitizer PdIIoctaethylporphyrin (PdOEP) in solution containing DTACl, DTACN, or DNA‐CN at 532 nm with an ultralow excitation power density of 0.5 W cm?2 results in anti‐Stokes blue emission. The maximum upconversion quantum yield (ΦUC=17.4 %) was obtained for the couple PdOEP/DTACl. In addition, the efficiency of the triplet–triplet energy transfer process was quantitatively studied by quenching experiments. Experimental results revealed that a highly effective acceptor for upconversion should combine high fluorescence quantum yields with efficient quenching of the sensitizer triplet. |
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| Keywords: | anthracene fluorescence Stern– Volmer quenching constants triplet acceptors upconversion |
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