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  1. 1 Acta Physica Polonica A

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  1. 1 1996

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  1. 1 Liem N.

  2. 1 Quang V.

  3. 1 Thanh D.

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Identification of the IB Emission Band in Al-Doped ZnS Crystals

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Liem N., Quang V., Thanh D.
Acta Physica Polonica A
|
1996
|
vol. 89
|
issue 5-6
717-726
EN
Time-resolved luminescence spectroscopy and thermal lensing techniques are applied to the study of deep centre photoluminescence and absorption in Al-doped ZnS crystals, which are as-grown or heat treated in different Zn rich or S rich atmospheres. A blue emission band peaking at 2.89 eV has been identified as IB band in all the mentioned crystals. Parameters of the IB band at 300 K, 77 K and 10 K such as peak energy, half width of spectrum, radiative lifetime have been determined. The IB band exhibits some special properties such as a shift neither with increasing delay time nor with excitation intensity nor with sample temperatures as well as a superlinearly excitation intensity dependence of the luminescence. An energy diagram and electronic transitions in the IB centre are presented to explain the experimental results.
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