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Lutetium(III) porphyrinoids as effective triplet photosensitizers for photon upconversion based on triplet-triplet annihilation (TTA)

Abstract

We described the first application of lanthanide complexes of porphyrinoids, exemplified by lutetium (Lu), as efficient photosensitizers in photon upconversion (UC) based on triplet-triplet annihilation (TTA). Compared to the widely used d block metals, Lu(III) porphyrinoids exhibit better than sensitization ability in photon UC based on TTA (TTA-UC), which is ascribed to the extra long triplet lifetime compared with d block metal counterparts, using 9,10-bis(2-phenylethynyl)anthracene (BPEA) or rubrene as acceptor. Notably, Lu(III) complexes of porphyrin (Lu-1)/BPEA pair showed high upconversion efficiency of 12.4% in degassed toluene. Importantly, to demonstrate the potential application of Lu porphyrinates in TTA-UC based bioimaging, we prepared nanomicelles and mesoporous silica nanoparticles with Lu-1/BPEA or Lu(III) porpholactone (Lu-2)/BPEA pairs. In living cell imaging, the capability of Lu-1 or Lu-2 as TTA sensitizer has been manifested, displaying the potential application in biological studies. This work enriches the repertoire of metal sensitizers in TTA-UC with the capability of living cell imaging and, more importantly, also extends the scope of lanthanide coordination chemistry to lanthanide chemical biology related to biological optical materials and medicine.

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Publication details

The article was received on 23 May 2018, accepted on 04 Jul 2018 and first published on 04 Jul 2018


Article type: Research Article
DOI: 10.1039/C8QI00477C
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Lutetium(III) porphyrinoids as effective triplet photosensitizers for photon upconversion based on triplet-triplet annihilation (TTA)

    Z. Yang, Y. Ning, H. Yin and J. Zhang, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI00477C

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