عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
TLpq230794640
انگلیسی
Photoluminescence characterization of zinc(1-x) manganese(x) sulfur under different excitation sources
[Thesis]
Y. Ye
F. D. Medina
Florida Atlantic University
1993
128
M.S.
Florida Atlantic University
1993
A study of the temperature dependence of the photoluminescence spectra from Zn1-xMnxS (x = 0.01, 0.03, 0.05, 0.10, 0.20, 0.25, 0.30, 0.35 and 0.50) with different excitation energies (514.5, 488.0, 457.9, 405.5 and 365.9 nm) is given. A new band is reported in addition to the four usual emission bands. The unusual shift of the 2.1 eV (YEL) band energy is first observed in our experiments. Models for YEL, ORG (2.0 eV) and RED (1.7 eV) emission bands have been proposed. The quenching with concentration and temperature and the influence of excitation energy on the photoluminescence are discussed. The spin-spin exchange interaction between the nearest neighbor Mn ions (d-d electrons), and the exchange interaction between 3d electrons of Mn ions and the conduction or valence band electrons (d-s or d-p electrons) are introduced to interpret the shift of the bands. The strong electron-phonon interaction is also analyzed, and an effective phonon energy and a Huang-Rhys factor are obtained.
Applied sciences
Condensation
Materials science
Optics
Optics
Pure sciences
F. D. Medina
Y. Ye
مطالعه متن کتاب p
[Thesis]
276903
a
Y
