Thermostimulated Luminescence Research Articles

Luminescence of multicomponent phosphate glasses with manganese

The emission spectra both of fluorescence at room temperature and at 520 K and of thermostimulated luminescence (TSL) of multicomponent alumino-phosphate glasses with various Mn concentration (0·2–20mol%) has been measured. The colour of fluorescence and TSL changes from orange to yellow with increasing temperature at constant concentration of Mn and from yellow to red with increasing concentration at constant temperature. The colour shift with temperature can be explained by means of decreasing field strength, Dq with increasing distance Mn-O. The intensity of orange fluorescence at R.T. increases with increasing concentration up to about 5% Mn and then decreases in consequence of concentration quenching. On the contrary, the TSL intensity reaches its maximum at concentraction of about one order of magnitude smaller. The different behaviour of fluorescence and TSL intensity in dependence on Mn is probably due to their different elementar mechanisms.

The thermostimulated luminescence of natural zircon

The thermostimulated luminescence of natural zircon

Thermoluminescence of magnesium oxide, excited by oxygen chemisorption

The thermostimulated luminescence of MgO after the adsorption of molecular oxygen was detected. It was shown that an analogy exists between this luminescence and thermoluminescence during photo-excitation. A recombination mechanism is proposed to explain the discovered phenomenon, and also adsorption luminescence.

Z-like-centers in vanadium doped NaCl crystals

The absorption, thermostimulated luminescence (TSL) and electron emission (TSE) of prepared and X-irradiated NaCl crystals doped with vanadium were studied. From the TSE-, TSL- and thermo-optical bleaching (TOB-) curves it is suggested that the new 647 nm absorption band and the new TSE- and TSL-peaks at about 480–490 °K are due to Z-centers, i.e. to the aggregates ofF-centers with dipole complexes (divalent vanadium ions and cation vacancies).

The role of auger effect in thermostimulated phenomena in ionic crystals

Absorption and thermostimulated luminescence simultaneously with electric conductivity in KI crystals irradiated with X-rays at L.N.T. were measured. The kinetics of these and many other similar results obtained in other alkali halides are interpreted on the basis of Auger process occurring in consequence of the recombination of free holes with localized electrons inF-centers.

?340 nm color centers? and thermostimulated luminescence of lif crystals

?340 nm color centers? and thermostimulated luminescence of lif crystals

Thermostimulated luminescence and stimulation of ZnS-Cl phosphors by IR light

Thermostimulated luminescence and stimulation of ZnS-Cl phosphors by IR light

On mechanism of recombination luminescence of alkali-halides doped by Eu2+

It is known that the ions of Eu2+ enter the lattice of alkali-halides together with the cation vacancies. The complex Eu2+Vc- is stable up to 200°C. It, at the same time, is the center of emission. We have found out that there is an electronic recombination mechanism of the luminescence upon the stimulation with light from F- or electronic activator bands in alkali-halides doped by Eu2+. Besides we have stated that there is a mechanism of emission like that mentioned above in X-ray induced and thermostimulated luminescence. The activator emission which is characteristic of Eu2+ is observed in all kinds of luminescence. Special test result is that Eu3+ is not produced under X-ray irradiation, hence the activator must form the hole recombination centers which are needed for the production of the electronic recombination mechanism of the luminescence. The study of the spectral characteristics of the investigated crystals indicates that the hole activator centers are produced under X-ray irradiation. These centers are observed in the induced absorption spectra in KI-Eu. If such centers are not observed in the crystal, photostimulated and thermostimulated luminescence does not take place.

Semiconductor device life and system removal rates : D. S. Peck, Proc. 1968 Ann. Symp. Reliab., Boston, U.S.A. January (1968), p. 593

The radiation-induced defect types in LaB3O6 and Li6Gd(BO3)3:Ce single crystals have been determined taking into account crystal-lattice features, absorption characteristics, photo- and thermostimulated luminescence data. The possible activator center models in Li6Gd(BO3)3:Ce crystals are proposed.

The mechanism of disintegration of color centers and the non-stationary recombination luminescence of NaCl-Ag phosphor crystal. I

A combined method has been used to study the disintegration processes of the 355, 465, and 720 color centers of NaCl-Ag phosphor in the temperature range 100–550 ° K. The emission spectra of thermostimulated and photostimulated recombination luminescence of NaCl-Ag excited by X-rays at various temperatures were also studied. The possibility of ion-electron and ion-hole disintegration mechanisms of the color centers in the phosphor crystal at low temperatures is examined.

Thermoluminiscence and exoelectron emission of KCl phosphors, activated by mercury-like ions

An experimental investigation is made of thermostimulated electronic emission and luminescence in potassium halide crystals activated with “mercury-like ions”. These phosphors were excited with X-rays or ultra-violet light in the activator absorption bands. The transfer of activator excitation to the host lattice, the creation of colour centres by these processes and the mechanism of exoelectron emission are discussed.