Effect of Surface States on Charge-Transfer Dynamics in Type II CdTe/ZnTe Core–Shell Quantum Dots: A Femtosecond Transient Absorption Study

2011 ◽  
Vol 115 (25) ◽  
pp. 12335-12342 ◽  
Author(s):  
Sachin Rawalekar ◽  
Sreejith Kaniyankandy ◽  
Sandeep Verma ◽  
Hirendra N. Ghosh
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Transient Absorption ◽  
Surface States ◽  
Core Shell ◽  
Type Ii ◽  
Absorption Study ◽  
Femtosecond Transient Absorption ◽  
Charge Transfer Dynamics ◽  
Effect Of Surface

scholarly journals Charge transfer dynamics of 9-arylcarbazole studied by femtosecond transient absorption spectroscopy

2020 ◽  
Author(s):  
Takamoto Kazuya ◽  
Ueno Yoshifumi ◽  
Ohta Kaoru ◽  
Akimoto Seiji ◽  
Matsubara Ryosuke ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Femtosecond Transient Absorption ◽  
Femtosecond Transient Absorption Spectroscopy ◽  
Charge Transfer Dynamics

Ligand-to-ligand charge transfer in heteroleptic Ir-complexes: comprehensive investigations of its fast dynamics and mechanism

2016 ◽  
Vol 18 (22) ◽  
pp. 15162-15169 ◽  
Author(s):  
Yang-Jin Cho ◽  
So-Yoen Kim ◽  
Minji Cho ◽  
Kyung-Ryang Wee ◽  
Ho-Jin Son ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Ancillary Ligands ◽  
Femtosecond Transient Absorption ◽  
Ligand Charge Transfer ◽  
Femtosecond Transient Absorption Spectroscopy ◽  
Charge Transfer Dynamics

The ligand-to-ligand charge transfer dynamics from cyclometalating ligand to ancillary ligands was probed using femtosecond transient absorption spectroscopy after the selective excitations.

Photoinduced charge transfer studies of type-II core-shell ZnTe-ZnSe quantum dots

2020 ◽  
Vol 22 (6) ◽  
Author(s):  
Simi N. J. ◽  
Anju Elsa Tom ◽  
Vinayakan R. ◽  
Ison V. V.
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Core Shell ◽  
Type Ii ◽  
Photoinduced Charge Transfer ◽  
Photoinduced Charge

scholarly journals Ultrafast Quenching of Excitons in the ZnxCd1-xS/ ZnS Quantum Dots Doped with Mn2+ through Charge Transfer Intermediates Results in Manganese Luminescence

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3007
Author(s):  
Dmitry Cherepanov ◽  
Andrei Kostrov ◽  
Fedor Gostev ◽  
Ivan Shelaev ◽  
Mikhail Motyakin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Electric Field ◽  
Transient Absorption ◽  
Kinetic Scheme ◽  
Stark Shift ◽  
Stimulated Emission ◽  
Decay Kinetics ◽  
Femtosecond Transient Absorption ◽  
Kinetics Of

For the first time, a specific time-delayed peak was registered in the femtosecond transient absorption (TA) spectra of ZnxCd1-xS/ZnS (x~0.5) alloy quantum dots (QDs) doped with Mn2+, which was interpreted as the electrochromic Stark shift of the band-edge exciton. The time-delayed rise and decay kinetics of the Stark peak in the manganese-doped QDs significantly distinguish it from the kinetics of the Stark peak caused by exciton–exciton interaction in the undoped QDs. The Stark shift in the Mn2+-doped QDs developed at a 1 ps time delay in contrast to the instantaneous appearance of the Stark shift in the undoped QDs. Simultaneously with the development of the Stark peak in the Mn2+-doped QDs, stimulated emission corresponding to 4T1-6A1 Mn2+ transition was detected in the subpicosecond time domain. The time-delayed Stark peak in the Mn2+-doped QDs, associated with the development of an electric field in QDs, indicates the appearance of charge transfer intermediates in the process of exciton quenching by manganese ions, leading to the ultrafast Mn2+ excitation. The usually considered mechanism of the nonradiative energy transfer from an exciton to Mn2+ does not imply the development of an electric field in a QD. Femtosecond TA data were analyzed using a combination of empirical and computational methods. A kinetic scheme of charge transfer processes is proposed to explain the excitation of Mn2+. The kinetic scheme includes the reduction of Mn2+ by a 1Se electron and the subsequent oxidation of Mn1+ with a hole, leading to the formation of an excited state of manganese.

Charge Transfer Dynamics and Auger Recombination of CdTe/CdS Core/Shell Quantum Dots

2015 ◽  
Vol 119 (31) ◽  
pp. 17971-17978 ◽  
Author(s):  
Li Wang ◽  
Yumei Tian ◽  
Tomoki Okuhata ◽  
Naoto Tamai
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Auger Recombination ◽  
Core Shell ◽  
Charge Transfer Dynamics

Study of Shell Thickness-Dependent Charge Transfer Dynamics in Green-Emitting Core/Shell Giant Quantum Dots

2021 ◽  
Author(s):  
Rahul Singh ◽  
Syed Akhil ◽  
V. G. Vasavi Dutt ◽  
Nimai Mishra
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Shell Thickness ◽  
Core Shell ◽  
Charge Transfer Dynamics

Surface-State-Mediated Charge-Transfer Dynamics in CdTe/CdSe Core-Shell Quantum Dots

ChemPhysChem ◽  
2011 ◽  
Vol 12 (9) ◽  
pp. 1729-1735 ◽  
Author(s):  
Sachin Rawalekar ◽  
Sreejith Kaniyankandy ◽  
Sandeep Verma ◽  
Hirendra N. Ghosh
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Surface State ◽  
Core Shell ◽  
Cdse Core ◽  
Charge Transfer Dynamics

Sensitization of TiO2 nanoparticles in micro-emulsion by photo-excited dye molecules: A femtosecond transient absorption study

2009 ◽  
Vol 204 (2-3) ◽  
pp. 209-216 ◽  
Author(s):  
Madhab C. Rath ◽  
Dipak K. Palit ◽  
Tulsi Mukherjee ◽  
Hirendra N. Ghosh
Keyword(s):  
Tio2 Nanoparticles ◽  
Transient Absorption ◽  
Dye Molecules ◽  
Absorption Study ◽  
Femtosecond Transient Absorption ◽  
Micro Emulsion
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