scholarly journals Electric field dependent radiative decay kinetics of polar InGaN/GaN quantum heterostructures at low fields

2009 ◽  
Vol 94 (21) ◽  
pp. 211107 ◽  
Author(s):  
Emre Sari ◽  
Sedat Nizamoglu ◽  
In-Hwan Lee ◽  
Jong-Hyeob Baek ◽  
Hilmi Volkan Demir
Keyword(s):  
Electric Field ◽  
Radiative Decay ◽  
Decay Kinetics ◽  
Field Dependent ◽  
Kinetics Of ◽  
Quantum Heterostructures

Radiative and non-radiative decay kinetics of (CdSe)N (N = 3 and 4) clusters

2019 ◽  
Vol 151 (6) ◽  
pp. 064306 ◽  
Author(s):  
Yujuan Xie ◽  
Shengping Yu ◽  
Li Zhang ◽  
Ning Du ◽  
Mingli Yang
Keyword(s):  
Radiative Decay ◽  
Decay Kinetics ◽  
Kinetics Of

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.

Luminescence and decay properties of the 1D2 level of Pr3+-doped YPO4

2011 ◽  
Vol 89 (3) ◽  
pp. 415-422 ◽  
Author(s):  
J. Collins ◽  
M. Bettinelli ◽  
B. Di Bartolo
Keyword(s):  
Low Temperature ◽  
Temperature Dependence ◽  
Radiative Decay ◽  
Spectroscopic Properties ◽  
Decay Rates ◽  
Decay Kinetics ◽  
Population Redistribution ◽  
Individual Crystal ◽  
Decay Properties ◽  
Kinetics Of

This investigation reports on the spectroscopic properties of trivalent Pr in YPO4. In particular, we show how the luminescence from the 1D2 level depends on the polarization of the emission and on the temperature of the sample. We also report on the decay kinetics of the 1D2 level, which show the lifetime decreasing as temperature is increased. Our observed lifetime of 440 µs is at low temperature and is significantly longer than that reported by other workers. We explain the temperature dependence of the 1D2 emission by considering the population redistribution in the 1D2 level, without invoking the existence of multiphonon relaxation. Finally, we estimate the radiative decay rates of individual crystal field levels within the 1D2 manifold.

Magnetic and electric field dependent anisotropic magnetoelectric multiferroicity in SmMn3Cr4O12

2021 ◽  
Vol 104 (5) ◽  
Author(s):  
Guangxiu Liu ◽  
Zhehong Liu ◽  
Yisheng Chai ◽  
Long Zhou ◽  
Xudong Shen ◽  
...  
Keyword(s):  
Electric Field ◽  
Field Dependent

Photoluminescence kinetics of type II GaAs/AlAs superlattices under the influence of an electric field

2005 ◽  
Author(s):  
D. V. Gulyaev ◽  
A. K. Bakarov ◽  
A. V. Tsarev ◽  
K. S. Zhuravlev
Keyword(s):  
Electric Field ◽  
Type Ii ◽  
Kinetics Of

Temperature and electric field dependent mobility in poly(3-hexylthiophene) diodes

2010 ◽  
Vol 108 (1) ◽  
pp. 014512 ◽  
Author(s):  
Michele Giulianini ◽  
Eric R. Waclawik ◽  
John M. Bell ◽  
Nunzio Motta
Keyword(s):  
Electric Field ◽  
Field Dependent
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