An article Evolution from Tunneling to Hopping Mediated Triplet Energy Transfer from Quantum Dots to Molecules WOS:000579400400046 published article about PHOTON UP-CONVERSION; LIGHT-EMITTING-DIODES; LONG-RANGE ELECTRON; BRIDGE ENERGETICS; TRANSFER DYNAMICS; TRANSFER RATES; NANOCRYSTALS; CHARGE; WIRE; TRANSPORT in [Huang, Zhiyuan; Huang, Tingting; Tang, Ming Lee] Univ Calif Riverside, Dept Chem, Riverside, CA 92521 USA; [Xu, Zihao; Lian, Tianquan] Emory Univ, Dept Chem, 1515 Pierce Dr, Atlanta, GA 30322 USA; [Gray, Victor; Moth-Poulsen, Kasper] Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden; [Gray, Victor] Uppsala Univ, Angstrom Lab, Dept Chem, S-75120 Uppsala, Sweden in 2020, Cited 59. The Name is 4,4′-Dibromobiphenyl. Through research, I have a further understanding and discovery of 92-86-4. Recommanded Product: 4,4′-Dibromobiphenyl
Efficient energy transfer is particularly important for multiexcitonic processes like singlet fission and photon upconversion. Observation of the transition from short-range tunneling to long-range hopping during triplet exciton transfer from CdSe nanocrystals to anthracene is reported here. This is firmly supported by steady-state photon upconversion measurements, a direct proxy for the efficiency of triplet energy transfer (TET), as well as transient absorption measurements. When phenylene bridges are initially inserted between a CdSe nanocrystal donor and anthracene acceptor, the rate of TET decreases exponentially, commensurate with a decrease in the photon upconversion quantum efficiency from 11.6% to 4.51% to 0.284%, as expected from a tunneling mechanism. However, as the rigid bridge is increased in length to 4 and 5 phenylene units, photon upconversion quantum efficiencies increase again to 0.468% and 0.413%, 1.5 1.6 fold higher than that with 3 phenylene units (using the convention where the maximum upconversion quantum efficiency is 100%). This suggests a transition from exciton tunneling to hopping, resulting in relatively efficient and distance-independent TET beyond the traditional 1 nm Dexter distance. Transient absorption spectroscopy is used to confirm triplet energy transfer from CdSe to transmitter, and the formation of a bridge triplet state as an intermediate for the hopping mechanism. This first observation of the tunneling-to-hopping transition for long-range triplet energy transfer between nanocrystal light absorbers and molecular acceptors suggests that these hybrid materials should further be explored in the context of artificial photosynthesis.
Recommanded Product: 4,4′-Dibromobiphenyl. Welcome to talk about 92-86-4, If you have any questions, you can contact Huang, ZY; Xu, ZH; Huang, TT; Gray, V; Moth-Poulsen, K; Lian, TQ; Tang, ML or send Email.
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