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Pressure Behavior of Deep Centers in ZnS x Te 1—x Alloys
Author(s) -
Liu N. Z.,
Li G. H.,
Zhang W.,
Zhu Z. M.,
Han H. X.,
Wang Z. P.,
Ge W. K.,
Sou I. K.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199901)211:1<163::aid-pssb163>3.0.co;2-3
Subject(s) - photoluminescence , hydrostatic pressure , emission spectrum , pressure coefficient , excitation , spectral line , alloy , analytical chemistry (journal) , materials science , stokes shift , hydrostatic equilibrium , line (geometry) , emission intensity , atomic physics , band gap , intensity (physics) , chemistry , luminescence , optics , physics , thermodynamics , metallurgy , optoelectronics , geometry , mathematics , chromatography , quantum mechanics , astronomy
We have measured photoluminescence of ZnS x Te 1— x alloys ( x > 0.7) at 300 K and under hydrostatic pressure up to 7 GPa. The spectra contain only a broad emission band under excitation of the 406.7 nm line. Its pressure coefficients are 47, 62 and 45 meV/GPa for x = 0.98, 0.92 and 0.79 samples, which are about 26%, 7% and 38% smaller than that of the band gap in the corresponding alloys. The Stokes shifts between emission and absorption of the bands were calculated by fitting the pressure dependence of the emission intensity, being 0.29, 0.48 and 0.13 eV for the three samples, respectively. The small pressure coefficient and large Stokes shift indicate that the emission band observed in our samples may correspond to the Te isoelectronic center in the ZnS x Te 1— x alloy.