Webinorganic crystals. In inorganic scintillators, e.g. NaI, CsI the scintillation arises because of the structure of the crystal lattice. The fluorescence mechanism in organic materials arises from transitions in the energy levels of a single molecule and therefore the fluorescence can be observed independently of the physical state. WebNov 27, 2000 · The position of the absorption and luminescence bands of Cu + ions depends significantly on the matrix. Thus, the absorption of Cu + ions in alkali halide crystals such as NaCl, 26 LiCl, 27...
Investigation of the structure of impurity defects in alkali halide ...
WebThe alkali metal halides exist as colourless crystalline solids, although as finely ground powders appear white. They melt at high temperature, usually several hundred … WebWe have investigated excitation spectra of the In+ ion luminescence directly excited by UV-light (6.1 to 6.4 eV) and creation spectra of the photostimulated luminescence, excited by F-band light after a preliminary monochromatic UV irradiation of KBr:In crystals with different In+ concentrations. Careful analysis of the excitation spectra allows us to detect a new D … black cat bone band
Alkali halide chemical compound Britannica
Webexcited state of the center. F center is the simplest trapped-electron center in alkali halide crystals. Absorption wavelength increases (~from 4000 angstrom to 6000 angstrom) with the size of the alkali ion (from Li to Cs) because the electron at the vacant site are less bound to the larger alkali ions. 5. Other centers. WebThe role of the alkali halides is to facilitate the melting process and, above all, to serve as coactivators (fluxes). Only small quantities of the alkali halide are integrated into the phosphor, but this small quantity is highly important for its luminescence efficiency. WebApr 25, 1986 · Pho- toconductivity in alkali halide crystals due to a two- photon process was observed [17]. Two-photon and three-photon absorption coefficients were measured … galley hill primary