Sensitizer design for efficient triplet-triplet annihilation upconversion: annihilator-appended tris-cyclometalated Ir(III) complexes

Enhanced triplet-triplet annihilation upconversion efficiency is achieved with two tris-cyclometalated iridium sensitizers covalently tethered with a pyrene annihilator. The improved sensitizing ability and very long phosphorescence lifetimes (1-2 ms) of these bichromophore molecules are both attrib...

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Published inChemical communications (Cambridge, England) Vol. 50; no. 58; pp. 7828 - 7830
Main Authors Peng, Jiang, Jiang, Xinpeng, Guo, Xinyan, Zhao, Dahui, Ma, Yuguo
Format Journal Article
LanguageEnglish
Published CAMBRIDGE Royal Soc Chemistry 25.07.2014
Subjects
Chemistry
Chemistry, Multidisciplinary
Covalence
Efficiency
Energy transfer
Iridium compounds
Phosphorescence
Physical Sciences
Pyrenes
Science & Technology
Sensitizing
Upconversion
POLYPYRIDINE
RUTHENIUM(II)
CHROMOPHORES
PHOTOSENSITIZERS
ENHANCEMENT
ENERGY-TRANSFER
LIFETIME
PHOTOPHYSICAL BEHAVIOR
EXCITED-STATES
LONG
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Summary:Enhanced triplet-triplet annihilation upconversion efficiency is achieved with two tris-cyclometalated iridium sensitizers covalently tethered with a pyrene annihilator. The improved sensitizing ability and very long phosphorescence lifetimes (1-2 ms) of these bichromophore molecules are both attributed to the intramolecular energy transfer between the iridium complex and appended pyrene group.
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ISSN:1359-7345
1364-548X
DOI:10.1039/c4cc01465k