Abstract: A thin film electroluminescence display element composed of a soda-lime glass substrate having provided thereon a barrier layer including tantalum (V) oxide, a transparent indium-tin oxide (ITO) electrode as a first electrode, a first insulating layer, a luminescent layer, a second insulating layer, and a second electrode is disclosed. The tantalum (V) oxide barrier layer effectively prevents sodium in the soda-lime glass substrate from diffusing into the ITO transparent electrode.

Abstract: A photosensitive member for electrophotography has a conductive substrate provided thereon with, in order, a charge transport layer, a charge generation layer, an interference control layer and an overcoating layer. The interference control layer has a refractive index substantially equal to the geometrical mean of the refractive indexes of the charge generation layer and the overcoating layer and a thickness such that the optical phase difference is substantially equal to .pi./2 radian or 3.pi./2 radian.

Abstract: The present invention relates to a method for producing a photoreceptor for electrophotography. An aluminum base substrate is worked so that the R.sub.max is between 1.3 and 1.8 microns, with a filtered maximum waviness not exceeding 0.5 microns. The substrate is etched with an aqueous solution of alkali, and then etched with an aqueous solution of nitric acid to form an oxide thin film. A Se-As alloy is vacuum deposited thereon to form a light sensitive layer. This photoreceptor is flat and smooth so that the images obtained by electrophotography are substantially free from white point defects.