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Radiative and nonradiative recombination processes in multi-quantum-wells
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10.1063/1.2427098
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    Affiliations:
    1 Institute for Ultrafast Spectroscopy and Lasers, The City College of The City University of New York, Convent Avenue, 138th Street, New York, New York 10031 and New York State Center for Advanced Technology for Ultrafast Photonic Materials and Applications, The City College of The City University of New York, Convent Avenue, 138th Street, New York, New York 10031
    2 Chemistry Department, The City College of The City University of New York, Convent Avenue, 138th Street, New York, New York 10031
    3 Institute for Ultrafast Spectroscopy and Lasers, The City College of The City University of New York, Convent Avenue, 138th Street, New York, New York 10031 and New York State Center for Advanced Technology for Ultrafast Photonic Materials and Applications, The City College of The City University of New York, Convent Avenue, 138th Street, New York, New York 10031
    4 Chemistry Department, The City College of The City University of New York, Convent Avenue, 138th Street, New York, New York 10031
    5 Institute for Ultrafast Spectroscopy and Lasers, The City College of The City University of New York, Convent Avenue, 138th Street, New York, New York 10031 and New York State Center for Advanced Technology for Ultrafast Photonic Materials and Applications, The City College of The City University of New York, Convent Avenue, 138th Street, New York, New York 10031
    a) Electronic mail: skzhang2000@yahoo.com
    J. Appl. Phys. 101, 023111 (2007); http://dx.doi.org/10.1063/1.2427098
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Figures

Image of FIG. 1.
FIG. 1.

Photoluminescence spectra of samples A–D measured at . The inset shows the measured (dots) and calculated (solid line) PL peak energies as a function of the well width.

Image of FIG. 2.
FIG. 2.

Time-resolved photoluminescence spectra of samples A (a), B (b), C (c), and D (d) measured at different temperatures. The solid line shown in (a) is the measured laser line.

Image of FIG. 3.
FIG. 3.

Measured (dots) and fitted (solid lines) temperature dependences of the PL decay times of samples A–D. The fitting curves were calculated according to Eq. (7) by considering for radiative recombination and Eq. (6) for nonradiative recombination.

Image of FIG. 4.
FIG. 4.

relationship of samples C and D.

Image of FIG. 5.
FIG. 5.

The factor as a function of the well width, where is proportional to the defect density .

Image of FIG. 6.
FIG. 6.

Measured (dots) and fitted (solid lines) temperature dependences of the integrated PL intensities of samples A–D. The solid curves were fitted according to Eq. (10) while the parameters in Table I were used. The laser powers used for excitation are for samples A and B, for sample C, and for sample D.

Image of FIG. 7.
FIG. 7.

Measured MPE activation energies as a function of the quantization energy in the investigated multi-quantum-wells (dots) and the fitting result (solid line) according to Eq. (11).

Tables

Generic image for table
Table I.

Parameters for samples A–D: well widths, PL peak wavelengths, center wavelengths of bandpass filters used for t-PL experiments, factors, factors, and the activation energies obtained from the linear relationships in high temperature range defined by Eq. (3) and from best fitting of the whole curves defined by Eq. (7). The values in parentheses were obtained by fitting temperature dependence of integrated PL intensity according to Eq. (10). These values are less reliable because of the weak nonradiative process in sample A and weak radiative process in sample C.

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/content/aip/journal/jap/101/2/10.1063/1.2427098
2007-01-23
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Radiative and nonradiative recombination processes in ZnCdSe∕ZnCdMgSe multi-quantum-wells
http://aip.metastore.ingenta.com/content/aip/journal/jap/101/2/10.1063/1.2427098
10.1063/1.2427098
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