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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
DC Field | Value | Language |
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dc.contributor.author | Kwon, Tae-Hyuk | - |
dc.contributor.author | Kim, Myoung Ki | - |
dc.contributor.author | Kwon, Jongchul | - |
dc.contributor.author | Shin, Dae-Yup | - |
dc.contributor.author | Park, Su Jin | - |
dc.contributor.author | Lee, Chang-Lyoul | - |
dc.contributor.author | Kim, Jang-Joo | - |
dc.contributor.author | Hong, Jong-In | - |
dc.date.accessioned | 2009-08-12T05:58:16Z | - |
dc.date.available | 2009-08-12T05:58:16Z | - |
dc.date.issued | 2007-07 | - |
dc.identifier.citation | Chem. Mater. 2007, 19, 3673 | en |
dc.identifier.issn | 0897-4756 (print) | - |
dc.identifier.issn | 1520-5002 (online) | - |
dc.identifier.uri | https://hdl.handle.net/10371/7017 | - |
dc.description.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. | en |
dc.description.sponsorship | We 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.iso | en | - |
dc.publisher | American Chemical Society | en |
dc.title | Highly efficient light-harvesting system based on a phosphorescent acceptor coupled with dendrimer donors via singlet-singlet and triplet-triplet energy transfer | en |
dc.type | Article | en |
dc.contributor.AlternativeAuthor | 권태혁 | - |
dc.contributor.AlternativeAuthor | 김명기 | - |
dc.contributor.AlternativeAuthor | 권종철 | - |
dc.contributor.AlternativeAuthor | 신대엽 | - |
dc.contributor.AlternativeAuthor | 박수진 | - |
dc.contributor.AlternativeAuthor | 이창렬 | - |
dc.contributor.AlternativeAuthor | 김장주 | - |
dc.contributor.AlternativeAuthor | 홍종인 | - |
dc.identifier.doi | 10.1021/cm070536k | - |
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