Quantum dots with indirect band gap: power-law photoluminescence decay

0439123 - FZÚ 2015 RIV GB eng J - Journal Article
Král, Karel - Menšík, Miroslav
Quantum dots with indirect band gap: power-law photoluminescence decay.
World Journal of Engineering. Roč. 11, č. 5 (2014), s. 507-512. ISSN 1708-5284
R&D Projects: GA MŠMT LH12236; GA MŠMT LH12186
Institutional support: RVO:68378271 ; RVO:61389013
Keywords : photoluminescence * quantum dots * electron-phonon interaction * inter-valley deformation potential interaction * power-law decay
Subject RIV: BM - Solid Matter Physics ; Magnetism

In this work the experimental effect of a slow decay of photoluminescence is studied theoretically in the case of quantum dots with an indirect energy band gap. The slow decay of the photoluminescence is considered as decay in time of the luminescence intensity, following the excitation of the quantum dot sample electronic system by a short optical pulse. In the presented theoretical treatment the process is studied as a single dot property. The inter-valley deformation potential interaction of the excited conduction band electrons with lattice vibrations is considered in the self-consistent Born approximation to the electronic self-energy. The theory is built on the non-equilibrium electronic quantum transport theory. The time dependence of the photoluminescence decay is estimated upon using a simple effective mass model. The numerical calculation of the considered model shows the power-law time characteristics of the photoluminescence decay in the long-time limit of the decay.
Permanent Link: http://hdl.handle.net/11104/0242431