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Developing efficient heavy-atom-free photosensitizers applicable to TTA upconversion in polymer films
Jiang Peng1, Xinyan Guo1, Xinpeng Jiang1
1Beijing National Laboratory for Molecular Sciences , Centre for Soft Matter Science and Engineering , Key Lab of Polymer Chemistry & Physics of the Ministry of Education , College of Chemistry , Peking University , Beijing 100871 , China . Email: ygma@pku.edu.cn ;
Abstract:
Heavy-atom-free triplet photosensitizers are developed by harnessing the thermally active triplet state of carbazolyl dicyanobenzene (CDCB) derivatives and applied to realize visible-to-ultraviolet photon upconversion (UC) via triplet-triplet annihilation (TTA). Demonstrating an annihilator-appending strategy, the designed sensitizers effectively realize TTA UC in polyurethane films with 2,7-di-tert-butylpyrene (DBP) as the annihilator/emitter. The covalently tethered DBP to CDCB is proven critical for achieving the superior sensitizing and UC performance in the solid matrix, essentially by suppressing the reverse ISC and more effectively transferring triplet excitons to free emitters.
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