Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9567146 | Applied Surface Science | 2005 | 6 Pages |
Abstract
ZnS films were deposited using an original chemical method under atmospheric pressure on to a glass and ceramics substrates. The ZnS films were doped with Cu, Cl by a thermal diffusion method from a ZnS-Cu, Cl powder. Laser processing realized by a pulse nitrogen laser (337Â nm) with a pulse time 5Â ns. The power density varied from 10 to 32Â MW/cm2. The morphology of films was investigated by atomic force microscopy (AFM). It was found that the luminescent properties and the surface morphology of the ZnS-Cu film undergo a change starting with the power density of 20Â MW/cm2. The analysis of results shows that optimum dose is 23Â MW/cm2. There is a laser ablation of the layer surface ZnS film during laser processing at the power densities greater than 20Â MW/cm2. Basic roughness of the surface film was 55Â nm.The laser processing resulted in the smoothing of surface. The roughness decreases to 27Â nm. The emission and the excitation spectra measured before the laser processing and later are different. The excitation spectra consist of two bands at 337 and 375Â nm. The laser processing changes the ratio of the bands intensities. The emission band maximum is 525Â nm. The maximum shifts to 521Â nm after the laser irradiation. The emission band shape changes too. It becomes asymmetric because of increase short-wave wing. An analysis of the available data is accomplished taking into account two alternative possibilities: an inhomogeneous distribution of the emission centers along the direction of the growth of the film and the laser processing of ZnS-Cu film.
Related Topics
Physical Sciences and Engineering
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Physical and Theoretical Chemistry
Authors
V. Khomchenko, L. Fedorenko, N. Yusupov, V. Rodionov, Yu. Bacherikov, G. Svechnikov, L. Zavyalova, N. Roshchina, P. Lytvyn, M. Mukhlio,