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Tytuł pozycji:

Correlation between excitons recombination dynamics and internal quantum efficiency of AlGaN-based UV-A multiple quantum wells.

Tytuł :
Correlation between excitons recombination dynamics and internal quantum efficiency of AlGaN-based UV-A multiple quantum wells.
Autorzy :
Murotani, Hideaki
Miyoshi, Hiroyuki
Takeda, Ryohei
Nakao, Hiroki
Ajmal Khan, M.
Maeda, Noritoshi
Jo, Masafumi
Hirayama, Hideki
Yamada, Yoichi
Pokaż więcej
Temat :
EXCITON theory
QUANTUM wells
QUANTUM theory
QUANTUM efficiency
RATE equation model
Źródło :
Journal of Applied Physics; 9/14/2020, Vol. 128 Issue 10, p1-7, 7p
Czasopismo naukowe
The correlation between the recombination dynamics of excitons and the internal quantum efficiency (IQE) of AlGaN-based UV-A multiple quantum wells (MQWs) was studied via photoluminescence (PL) and time-resolved PL (TRPL) spectroscopy. The probability ratio of the capture of excitons by nonradiative recombination centers (NRCs) and the radiative recombination of excitons was evaluated individually via two different experimental analyses. The IQE was evaluated via temperature- and excitation power density-dependent PL measurements and its dependence on excitation density was analyzed using a rate equation model based on the radiative and nonradiative recombination of excitons. Moreover, the radiative and nonradiative recombination lifetimes were evaluated via temperature-dependent TRPL measurements; furthermore, they were analyzed as functions of temperature and excitation energy density. The probability ratios obtained from the two individual analyses were in agreement. This quantitative agreement indicated that the analysis based on the radiative and nonradiative recombination processes of excitons, which included the process of filling NRCs, was valid for AlGaN-based UV-A MQWs. [ABSTRACT FROM AUTHOR]
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