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Kwon, Tae-Hyuk
Energy Recognition
Research Interests
  • Energy transfer, organic solar cells, supercapacitor, ultrasonic spray chemistry, dithienothiophene, iridium complexes, phosphorescent bioapplications

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Highly efficient light-harvesting system based on a phosphorescent acceptor coupled with dendrimer donors via singlet-singlet and triplet-triplet energy transfer

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Title
Highly efficient light-harvesting system based on a phosphorescent acceptor coupled with dendrimer donors via singlet-singlet and triplet-triplet energy transfer
Author
Kwon, Tae-HyukKim, Myoung KiKwon, JongchulShin, Dae-YupPark, Su JinLee, Chang-LyoulKim, Jang-JooHong, Jong-In
Keywords
POLY(ARYL ETHER) DENDRIMERS; EMITTING-DIODES; ELECTRON-TRANSFER; PHOTOISOMERIZATION; POLYMERS; ELECTROLUMINESCENCE; CONVERSION; COMPLEXES; MOLECULES; DENDRONS
Issue Date
2007-07
Publisher
AMER CHEMICAL SOC
Citation
CHEMISTRY OF MATERIALS, v.19, no.15, pp.3673 - 3680
Abstract
A series of efficient light-harvesting systems (FIr3mGx, x = 1-3) based on dendrimer donor (mCP: N,N′-dicarbazolyl-3,5-benzene) derivatives coupled with a sky blue phosphorescent acceptor (FIrpic: iridium(III) bis[(4,6-difluorophenyl)pyridinato-N,C2′]-3-hydroxypicolinate derivative) were prepared, and their photophysical properties were investigated. The light-harvesting ability of FIr3mGx (x = 1-3) increases with the number of energy donor mCP units. The acceptor PL intensity of the donor-acceptor conjugate dendrimers (FIr3mGx, x = 1-3) increases over 6 times with the number of mCP units via sensitization from the light-harvesting antenna after excitation at the donor absorption (λex = 310 nm), as compared to that of only an acceptor without a donor (FIrpic) upon excitation at the MLCT region (λex = 380 nm) because of efficient intramolecular singlet-singlet and triplet-triplet energy transfer from the donor to the acceptor and less luminance quenching induced by the bulky dendrimer structure. The singlet-singlet intramolecular energy transfer in FIr3mGx from the dendrimer donor to the acceptor exhibits a high efficiency of greater than 90% via the steady-state PL method and 94% via the transient PL method. Additionally, the triplet-triplet energy transfer efficiency via the transient PL method exhibits an efficiency greater than 99%. This indicates that FIr3mGx exhibits good light-harvesting abilities because the mCP unit is an efficient light absorber and because the core FIrpic functions as a spatial energy concentrator that drains energy from the dendrimer donor.
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DOI
10.1021/cm070536k
ISSN
0897-4756
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PHY_Journal Papers
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