PHONON BROADENING OF EMISSION SPECTRA FOR STE AND AUGER-FREE LUMINESCENCE

2001 ◽  
Vol 15 (28n30) ◽  
pp. 4032-4035 ◽  
Author(s):  
V. N. MAKHOV ◽  
V. N. KOLOBANOV ◽  
M. KIRM ◽  
S. VIELHAUER ◽  
G. ZIMMERER
Keyword(s):  
Alkali Halide ◽  
Lattice Structure ◽  
Thermal Quenching ◽  
Emission Spectra ◽  
Luminescence Spectra ◽  
Phonon Modes ◽  
Exciton Emission ◽  
Different Types ◽  
Alkali Halide Crystals ◽  
Typical Temperature

The temperature dependencies of the bandwidths for self-trapped exciton emission spectra in several alkali halide crystals with high temperature of thermal quenching for self-trapped exciton emission (NaBr, KI, CsI) have been studied and compared with a typical temperature behavior of Auger-free luminescence spectra. It was shown that different phonon modes are responsible for broadening of emission band for different types of self-trapped excitons as well as for different bands in the spectrum of Auger-free luminescence. The features found indicate that the lattice structure of emitting state for Auger-free luminescence has most probably the on-center character.

Luminescent Properties of As-Grown and Vacuum Annealed LiNbO3 Single Crystals

2013 ◽  
Vol 200 ◽  
pp. 199-202
Author(s):  
Dmytro Yu. Sugak ◽  
Andriy P. Luchechko
Keyword(s):  
Single Crystals ◽  
Room Temperature ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Annealed Sample ◽  
Luminescence Spectra ◽  
Excitation Spectra ◽  
X Ray ◽  
Grown Sample ◽  
Different Types

This paper reports on the luminescent properties of the congruent as-grown and vacuum annealed LiNbO3 single crystals at the UV and X-ray excitations. The shape of excitation spectra is similar for all emission bands in as-grown sample as well as in vacuum annealed sample. The emission spectra (exc=235 nm) observed in the spectral region 250…800 nm at room temperature consist of five elementary bands. Correlation of the relative intensities bands in luminescence spectra under different types of excitation and their temperature dependencies were determined. The most intensitive maxima in as-grown sample are observed at 295 and 691 nm. The main maximum after vacuum annealing is peaked around 295 nm.

AN EXAMINATION OF VERWEY'S MODEL FOR THE LATTICE STRUCTURE OF THE FREE SURFACE OF ALKALI HALIDE CRYSTALS

1956 ◽  
Vol 34 (3) ◽  
pp. 265-275 ◽  
Author(s):  
G. C. Benson ◽  
H. P. Schreiber ◽  
D. Patterson
Keyword(s):  
Free Surface ◽  
Surface Energy ◽  
Surface Structure ◽  
Alkali Halide ◽  
Mechanical Stability ◽  
Lattice Structure ◽  
Lithium Salts ◽  
Repulsive Potentials ◽  
Alkali Halide Crystals ◽  
Effect Of Surface

The Verwey model for the free surface structure of alkali halide crystals at 0° K. has been used to estimate the effect of surface distortion on the surface energy of these crystals. It appears that the contributions from distortion are considerably larger than previously reported. In the case of some lithium salts the corrected surface energy becomes negative; the mechanical stability of the solid is considered in the light of this. Several aspects of the Verwey model have been examined. These include the effect of various repulsive potentials and forms of distortion.

scholarly journals A digital technology for scanning the luminescent characteristics of alkali halide crystals

2021 ◽  
Vol 80 (2) ◽  
pp. 55-61
Author(s):  
А. G. Мarатоvа ◽  
◽  
Zh. К. Ubayev ◽  
К. Sh. Shunkeyev ◽  
L. N. Myasnikova ◽  
...  
Keyword(s):  
Digital Technology ◽  
Alkali Halide ◽  
Graphical Representation ◽  
Photon Counting ◽  
Scanning Speed ◽  
Luminescence Spectra ◽  
Special Programs ◽  
Mathematical Processing ◽  
Alkali Halide Crystals ◽  
Photon Counting Mode

A digital technology for scanning the X-ray luminescence, tunnel luminescence, and thermostimulated luminescence spectra in the spectral range from 200 nm to 850 nm is experimentally demonstrated using the example of a NaCl crystal, which is part of the group of alkali halide crystals. This is done with the specified spectrum intervals and scanning speed using a high-aperture monochromator MSD-2 and a photoelectronic multiplier type H 8259 of the company “Hamamatsu”, operating in the photon counting mode, controlled by special programs SpectraScan and ThermoScan. The obtained experimental data are digitally converted for further processing of the graphical representation of the results using the OriginPro software package, which allows you to draw up graphical dependencies of the spectra and perform their mathematical processing.

Anion polarizability functions in alkali halide crystals

1997 ◽  
Vol 92 (6) ◽  
pp. 1029-1033
Author(s):  
A. BATANA ◽  
J. BRUNO ◽  
R.W. MUNN
Keyword(s):  
Alkali Halide ◽  
Alkali Halide Crystals
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