The Langmuir-Blodgett (LB) technique was used for studying enhanced lumines-cence of Eu (TTA)3 Phen (acceptor) by La (TTA)3 Phen (donor). LB films studied here are:(1) [0. 5% Eu (TTA)3 Phen + 99. 5% La (TTA)3 Phen]: A...The Langmuir-Blodgett (LB) technique was used for studying enhanced lumines-cence of Eu (TTA)3 Phen (acceptor) by La (TTA)3 Phen (donor). LB films studied here are:(1) [0. 5% Eu (TTA)3 Phen + 99. 5% La (TTA)3 Phen]: AA = 1: 1; (2) [0. 5%Eu(TTA)3 Phen+99. 5%AA]: AA= 1: 1; (3) La(TTA)3 Phen: AA= 1: 1. These filmscould form stable monolayers at air/water surface. The fluorescence intensity of LB 1 was 65times stronger than that of LB2. This signifies that the luminescence intensity ofEu(TTA)3 Phen could be enhanced by La (TTA)3 Phen clearly. Low angle X-ray diffrac-tog ram of LB1 showed that the film has a period layered structure. To study the intermolec-ular energy transfer, different structures of the multilayer were designed by combining LB2(layer of acceptor) with LB3(layer of donor). The results indicated that the intermolecularenergy transfer occurred in a short-range (<3 nm) and at the position of head-head in Y-typemodel. The influence of the interface on the energy transfer was prominent. The process ofenergy transfer was carried out via the triplet state of TTA.展开更多
Sensitizing molecular triplets by colloidal nanocrystals via triplet energy transfer is important for applications such as upconversion or organic synthesis.Typically two step triplet energy transfer(TET)are included ...Sensitizing molecular triplets by colloidal nanocrystals via triplet energy transfer is important for applications such as upconversion or organic synthesis.Typically two step triplet energy transfer(TET)are included in these applications:firstly the triplet energy stored in nanocrystals are extracted into surface ligands,and then the ligands further transfer triplet energy into molecules in bulk solution.Here we report one-step TET application from CsPbBr_(3)perovskite nanocrystals(NCs)to surface-anchored metalloporphyrin derivative molecules(MP).Compared to conventional two-step TET,the one-step TET mechanism possess lower energy loss and higher TET efficiency which is more generally implementable.In this scheme,photoexcitation of CsPbBr_(3)NCs leads to the sensitization of MP ligands triplets which efficiently emit phosphorescence.The enhanced light absorption of MP ligands and down-shifted photon emission can be useful in devices such as luminescent solar concentrators.展开更多
文摘The Langmuir-Blodgett (LB) technique was used for studying enhanced lumines-cence of Eu (TTA)3 Phen (acceptor) by La (TTA)3 Phen (donor). LB films studied here are:(1) [0. 5% Eu (TTA)3 Phen + 99. 5% La (TTA)3 Phen]: AA = 1: 1; (2) [0. 5%Eu(TTA)3 Phen+99. 5%AA]: AA= 1: 1; (3) La(TTA)3 Phen: AA= 1: 1. These filmscould form stable monolayers at air/water surface. The fluorescence intensity of LB 1 was 65times stronger than that of LB2. This signifies that the luminescence intensity ofEu(TTA)3 Phen could be enhanced by La (TTA)3 Phen clearly. Low angle X-ray diffrac-tog ram of LB1 showed that the film has a period layered structure. To study the intermolec-ular energy transfer, different structures of the multilayer were designed by combining LB2(layer of acceptor) with LB3(layer of donor). The results indicated that the intermolecularenergy transfer occurred in a short-range (<3 nm) and at the position of head-head in Y-typemodel. The influence of the interface on the energy transfer was prominent. The process ofenergy transfer was carried out via the triplet state of TTA.
基金This work is supported by the National Natural Science Foundation of China(No.21803070).
文摘Sensitizing molecular triplets by colloidal nanocrystals via triplet energy transfer is important for applications such as upconversion or organic synthesis.Typically two step triplet energy transfer(TET)are included in these applications:firstly the triplet energy stored in nanocrystals are extracted into surface ligands,and then the ligands further transfer triplet energy into molecules in bulk solution.Here we report one-step TET application from CsPbBr_(3)perovskite nanocrystals(NCs)to surface-anchored metalloporphyrin derivative molecules(MP).Compared to conventional two-step TET,the one-step TET mechanism possess lower energy loss and higher TET efficiency which is more generally implementable.In this scheme,photoexcitation of CsPbBr_(3)NCs leads to the sensitization of MP ligands triplets which efficiently emit phosphorescence.The enhanced light absorption of MP ligands and down-shifted photon emission can be useful in devices such as luminescent solar concentrators.
