1. Exciton recombination dynamics in single ZnO tetrapods.
- Author
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Fernandes-Silva, Lígia C., Martín, Maria D., van der Meulen, Herko P., Klopotowski, Lukasz, Calleja, José M., and Viña, Luis
- Subjects
OPTICAL properties of zinc oxide ,EXCITON theory ,RECOMBINATION (Chemistry) ,TETRAPODS ,TIME-resolved spectroscopy ,PHOTOLUMINESCENCE - Abstract
We present the optical properties of individual ZnO tetrapods as a function of excitation power and temperature by time-integrated and time-resolved spectroscopy. At 10K, we identify the different excitonic transitions by both their characteristic energy and their excitation power dependence. When we increase the tetrapod temperature we observe that the emission intensity decrease and occur a red shift of the emission energies. Our time-resolved studies confirm the predominance of the radiative recombination at low temperatures (< 45 K). Increasing the temperature opens up the non-radiative channels, which are evidenced by a much faster decay time. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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