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Your search keyword '"Wang, W. J."' showing total 15 results
Start Over Author "Wang, W. J." Journal applied physics letters
15 results on '"Wang, W. J."'

3. Observation of symmetrically decay of A1(longitudinal optical) mode in free-standing GaN bulk single crystal from Li3N flux method

Author

Zhang, X. H., primary, Zhao, C. L., additional, Han, J. C., additional, Wang, Y., additional, Jian, J. K., additional, Wang, G., additional, Zhang, Z. H., additional, Li, H., additional, Wang, W. J., additional, Song, Y. T., additional, Liu, Y., additional, Bao, H. Q., additional, Chen, X. L., additional, and Song, B., additional

Published
2013
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13. Time-resolved photoluminescence of isoelectronic traps in ZnSe1-xTex semiconductor alloys.

Author

Lin, Y. C., Chou, W. C., Fan, W. C., Ku, J. T., Ke, F. K., Wang, W. J., Yang, S. L., Chen, W. K., Chang, W. H., and Chia, C. H.

Subjects
PHOTOLUMINESCENCE, ENERGY transfer, HOPPING (Locomotion), CONDUCTION electrons, BANDWIDTHS
Abstract

Kohlrausch’s stretched exponential law correlates well with the photoluminescence (PL) decay profiles of ZnSe1-xTex. As the Te concentration increases, the stretching exponent β initially declines and then monotonically increases. This result can be understood using the hopping-transport and energy transfer model. The increase in the number of isoelectronic Te localized traps can reduce the PL decay rate and increase the linewidth, whereas the hybridization of the Te localized states with the valence-band edge states causes a reduction in both the lifetime and linewidth. [ABSTRACT FROM AUTHOR]

Published
2008
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14. Electronic and magnetic properties of the Ag-doped Fe3O4 films studied by x-ray absorption spectroscopy.

Author

Liu, S. H., Tsai, H. M., Pao, C. W., Chiou, J. W., Ling, D. C., Pong, W. F., Tsai, M.-H., Lin, H. J., Jang, L. Y., Lee, J. F., Hsu, J. H., Wang, W. J., and Hsu, C. J.

Subjects
MAGNETIC films, MAGNETITE, CHARGE exchange, MAGNETIZATION, EXTENDED X-ray absorption fine structure, X-ray absorption near edge structure, CIRCULAR dichroism
Abstract

The electronic and magnetic properties of Ag-doped Fe3O4 films were studied by x-ray absorption near-edge structure (XANES), extended x-ray absorption fine structure (EXAFS), and x-ray magnetic circular dichroism (XMCD) measurements. A comparison between the Ag K-edge EXAFS Fourier transform spectra of Ag-doped Fe3O4 and the Ag metal shows that Ag atoms aggregate into Ag granules. The O K-edge and Ag L3-edge XANES spectra consistently indicate an electron transfer from the Fe3O4 host into Ag granules. The Fe L3,2-edge XMCD spectra and hysteresis measurements reveal that Ag granules reduce the average magnetic moment of Fe ions and the saturation magnetization of Fe3O4. [ABSTRACT FROM AUTHOR]

Published
2006
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15. Lifetime study of N impurity states in GaAs1-xNx (x=0.1%) under hydrostatic pressure.

Author

Wang, W. J., Yang, X. D., Ma, B. S., Sun, Z., Su, F. H., Ding, K., Xu, Z. Y., Li, G. H., Zhang, Y., Mascarenhas, A., Xin, H. P., and Tu, C. W.

Subjects
*PHOTOLUMINESCENCE, *HYDROSTATIC pressure, *IMPURITY distribution in semiconductors, *ELECTRON emission, *BINDING energy, *ELECTRODES
Abstract

The lifetimes of a series of N-related photoluminescence lines (A2–A6) in GaAs1-xNx (x=0.1%) were studied under hydrostatic pressures at ∼30 K. The lifetimes of A5 and A6 were found to increase rapidly with increasing pressure: from 2.1 ns at 0 GPa to more than 20 ns at 0.92 GPa for A5 and from 3.2 ns at 0.63 GPa to 10.8 ns at 0.92 GPa for A6. The lifetime is found to be closely correlated with the binding energy of the N impurity states, which is shown either in the pressure dependence for a given emission line or in the lifetime variation from A2 to A6. [ABSTRACT FROM AUTHOR]

Published
2006
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