Patent ID: 6159679
Filing Date: 2000-12-12
Classification: G03C

Abstract:
A photosensitive image-forming element comprising on a support at least one photosensitive layer containing silver halide crystals internally doped in the center of the crystal volume with a transition metal complex while forming a deep and permanent electron trap providing an incorporated molecular entity having a trapping lifetime whereby the lowest unoccupied molecular orbital of the incorporated molecular entity is at least 0.5 eV below the conduction band of the silver halide crystal, and the trapping lifetime at room temperature is longer than 0.2 seconds and satisfying the equation (I):0<FORM<10.sup.+5 (I)wherein ##EQU3## wherein d.sub.1 represents a spherical equivalent diameter (SED), expressed in .mu.m, corresponding with a central part of said crystal doped with the said transition metal complex, d expressed in .mu.m represents the spherical equivalent diameter of the whole crystal volume, while Q represents the concentration of the transition metal complex, expressed in 10.sup.-9 mole per mole of silver halide and wherein the said transition metal complex has the following general formula (1):[MX.sub.n Y.sub.m L.sub.q ].sup.r- ( 1)wherein:M represents a metal selected from the group consisting of an element from Group 5 up to Group 10 of the Periodic System of the Elements;X and Y, which are different from each other, each represents one of the elements from the group consisting of Cl, Br and I;L represents any anorganic or organic ligand;n and m each equals an integer having a value from 0 to 6, while n+m equals 4, 5 or 6;q equals 0, 1 or 2 so that n+m+q=6 andr equals 1, 2, 3 or 4whereby from about 3 to about 75 volume percent of said transition metal complex is located in the inner region of the crystal volume.