DISPERSE STRUCTURE OF ELECTROPHOSPHORS INFLUENCE ON LIGHTING PARAMETERS OF ELECTROLUMINESCENT EMITTERS OF A DIRECT CURRENT.
In processes of aging electroluminescent emitters (ELE) the big role is given to disperse structure of the electrophosphors excited by constant electric field (ELCF). In this connection the purpose of the present work is research of influence of the form, and the size of phosphor particles on density of an electroluminescent layer, reliability, electrophysical and optical characteristics of ELE. The difficult structure of particles of an initial phosphor and its change in process of a technological chain is shown. Special attention is given to the influence of disperse structure ELCF on processes of ELE aging. Fractions of phosphor ZnS:Cu, Mn, Ga were isolated in a cone by an ascending stream method. It is shown that the basic change of brightness occurs within first five hours ("fast" aging). ELE stability made on a large fraction is higher though the initial brightness is slightly lower. The best results regarding stability give ELCF with the size of particles 3-4 microns. A complex character of dependence of stability of ELE work on the sizes of particles ELCF finds a satisfactory explanation within the limits of "the field" theory of aging processes of direct current indicators, the one offered by the authors.