Photoluminescence of exciton and biexciton in GaN nanocolumns
Photoluminescence of exciton and biexciton in GaN nanocolumns
复制标题
DOI：
10.1016/j.jlumin.2007.12.021
复制
发表时间：
2008-05
影响因子：
3.6
通讯作者：
K. Kouyama;Masaya Inoue;Y. Inose;N. Suzuki;H. Sekiguchi;H. Kunugita;K. Ema;A. Kikuchi;K. Kishino
中科院分区：
文献类型：
--
作者：
K. Kouyama;Masaya Inoue;Y. Inose;N. Suzuki;H. Sekiguchi;H. Kunugita;K. Ema;A. Kikuchi;K. Kishino
We measured photoluminescence (PL) from excitons and biexcitons in GaN nanocolumns at low temperature and found that the PL spectra of excitons depend on the nanocolumn diameter. Taking into account the polaritonic effect of the excitons, calculation of the PL spectra revealed that the dependence on diameters causes a difference of PL intensity from side surfaces of the nanocolumns. At high excitation intensities, we also observed biexciton emissions and found that the biexciton binding energies are higher than those in bulk samples. Although the mechanism for the increase in the binding energy is not clear at present, we suppose that it arises from a spatial confinement effect due to the nanocolumn morphology.
