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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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dc.contributor.authorKwon, Tae-Hyuk-
dc.contributor.authorKim, Myoung Ki-
dc.contributor.authorKwon, Jongchul-
dc.contributor.authorShin, Dae-Yup-
dc.contributor.authorPark, Su Jin-
dc.contributor.authorLee, Chang-Lyoul-
dc.contributor.authorKim, Jang-Joo-
dc.contributor.authorHong, Jong-In-
dc.date.accessioned2009-08-12T05:58:16Z-
dc.date.available2009-08-12T05:58:16Z-
dc.date.issued2007-07-
dc.identifier.citationChem. Mater. 2007, 19, 3673en
dc.identifier.issn0897-4756 (print)-
dc.identifier.issn1520-5002 (online)-
dc.identifier.urihttp://hdl.handle.net/10371/7017-
dc.description.abstractA 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.en
dc.description.sponsorshipWe thank Samsung SDI-SNU for a
grant and the Seoul R&D Program for financial support. We
also acknowledge the BK 21 fellowship grants to T.-H.K. and
J.K. C.-L.L. thanks the Cambridge-KAIST Collaboration Program
for financial support.
en
dc.language.isoen-
dc.publisherAmerican Chemical Societyen
dc.titleHighly efficient light-harvesting system based on a phosphorescent acceptor coupled with dendrimer donors via singlet-singlet and triplet-triplet energy transferen
dc.typeArticleen
dc.contributor.AlternativeAuthor권태혁-
dc.contributor.AlternativeAuthor김명기-
dc.contributor.AlternativeAuthor권종철-
dc.contributor.AlternativeAuthor신대엽-
dc.contributor.AlternativeAuthor박수진-
dc.contributor.AlternativeAuthor이창렬-
dc.contributor.AlternativeAuthor김장주-
dc.contributor.AlternativeAuthor홍종인-
dc.identifier.doi10.1021/cm070536k-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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