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Photoluminescence characteristics of Cd1-xMnxTe single crystals grown by the vertical Bridgman method.

Hwang Y, Um Y, Park H - Nanoscale Res Lett (2012)

Bottom Line: The near-band-edge emissions of neutral acceptor-bound excitons (labeled as L1) were systematically investigated as a function of temperature and of alloy composition.The parameters that describe the temperature variation of the energy were evaluated by the semiempirical Varshni relation.The activation energies of thermal quenching were obtained for the L1 peak from the temperature dependence of the bound exciton peaks and were found to decrease with increasing Mn concentration.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, University of Ulsan, Ulsan, 680-749, South Korea. yhum@ulsan.ac.kr.

ABSTRACT
In this paper, we report a systematic investigation of band-edge photoluminescence for Cd1-xMnxTe crystals grown by the vertical Bridgman method. The near-band-edge emissions of neutral acceptor-bound excitons (labeled as L1) were systematically investigated as a function of temperature and of alloy composition. The parameters that describe the temperature variation of the energy were evaluated by the semiempirical Varshni relation. From the temperature dependence of the full width at half maximum of the L1 emission line, the broadening factors Γ(T) were determined from the fit to the data. The activation energies of thermal quenching were obtained for the L1 peak from the temperature dependence of the bound exciton peaks and were found to decrease with increasing Mn concentration.

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Temperature dependence of the FWHM of L1 emission lines for a series of Mn concentrations.
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Figure 3: Temperature dependence of the FWHM of L1 emission lines for a series of Mn concentrations.

Mentions: Figure 3 shows the temperature dependence of the full width at half maximum [FWHM] of the L1 emission line with Mn concentration x. With increasing Mn mole fraction x, the FWHM of the L1 emission line varies from approximately 3.02 meV for x = 0.0 to approximately 9.49 meV for x = 0.2. The FWHM of the L1 emission line also increases with increasing temperature, which can be accounted for by increasing the exciton-phonon interaction at higher temperatures. The temperature dependence of the emission linewidth caused by exciton-phonon interactions has the form [20]


Photoluminescence characteristics of Cd1-xMnxTe single crystals grown by the vertical Bridgman method.

Hwang Y, Um Y, Park H - Nanoscale Res Lett (2012)

Temperature dependence of the FWHM of L1 emission lines for a series of Mn concentrations.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3275455&req=5

Figure 3: Temperature dependence of the FWHM of L1 emission lines for a series of Mn concentrations.
Mentions: Figure 3 shows the temperature dependence of the full width at half maximum [FWHM] of the L1 emission line with Mn concentration x. With increasing Mn mole fraction x, the FWHM of the L1 emission line varies from approximately 3.02 meV for x = 0.0 to approximately 9.49 meV for x = 0.2. The FWHM of the L1 emission line also increases with increasing temperature, which can be accounted for by increasing the exciton-phonon interaction at higher temperatures. The temperature dependence of the emission linewidth caused by exciton-phonon interactions has the form [20]

Bottom Line: The near-band-edge emissions of neutral acceptor-bound excitons (labeled as L1) were systematically investigated as a function of temperature and of alloy composition.The parameters that describe the temperature variation of the energy were evaluated by the semiempirical Varshni relation.The activation energies of thermal quenching were obtained for the L1 peak from the temperature dependence of the bound exciton peaks and were found to decrease with increasing Mn concentration.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, University of Ulsan, Ulsan, 680-749, South Korea. yhum@ulsan.ac.kr.

ABSTRACT
In this paper, we report a systematic investigation of band-edge photoluminescence for Cd1-xMnxTe crystals grown by the vertical Bridgman method. The near-band-edge emissions of neutral acceptor-bound excitons (labeled as L1) were systematically investigated as a function of temperature and of alloy composition. The parameters that describe the temperature variation of the energy were evaluated by the semiempirical Varshni relation. From the temperature dependence of the full width at half maximum of the L1 emission line, the broadening factors Γ(T) were determined from the fit to the data. The activation energies of thermal quenching were obtained for the L1 peak from the temperature dependence of the bound exciton peaks and were found to decrease with increasing Mn concentration.

No MeSH data available.


Related in: MedlinePlus