Open AccessTemperature dependence of the radiative recombination time in ZnO nanorods under an external magnetic field of 6T
Author(s) -
Woojin Lee,
Takayuki Kiba,
Akihiro Murayama,
Corinne Sartel,
Vincent Sallet,
I. Kim,
Robert A. Taylor,
YoungDahl Jho,
Kwangseuk Kyhm
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.017959
Subject(s) - photoluminescence , magnetic field , exciton , radiative transfer , nanorod , physics , spontaneous emission , condensed matter physics , atomic physics , effective mass (spring–mass system) , excited state , materials science , optics , laser , nanotechnology , quantum mechanics
The Temperature dependence of the exciton radiative decay time in ZnO nanorods has been investigated, which is associated with the density of states for the intra-relaxation of thermally excited excitons. The photoluminescence decay time was calibrated by using the photoluminescence intensity in order to obtain the radiative decay time. In the absence of an external magnetic field, we have confirmed that the radiative decay time increased with temperature in a similar manner to that seen in bulk material (∼ T1.5). Under an external magnetic field of 6 T parallel to the c-axis, we found that the power coefficient of the radiative decay time with temperature decreased (∼ T1.3) when compared to that in the absence of a magnetic field. This result can be attributed to an enhancement of the effective mass perpendicular to the magnetic field and a redshift of the center-of-mass exciton as a consequence of perturbation effects in the weak-field regime.