Development of full-color display combined with ultraviolet-electroluminescence/photoluminescence multilayered thin films

A series of systematic investigations have been carried out on a new type o f full-color display devices combining ultraviolet (UV) thin film electrolu minescence (EL) with red, green and blue (RGB) visible-light phosphors. The device structure is composed of phosphor/Indium Tin Oxide (ITO)/a-SiNx/ZnF 2:Gd/a-SiNx/Al/glass. UV emission from a ZnF2:Gd active layer is employed a s an excitation source for the phosphors. For the UV-EL/photoluminecsence ( PL) hybrid device using blue light-emitting phosphors, a maximum luminance of 10 cd/m(2) and a maximum efficiency of 0.015 1m/W has been achieved whil e the luminance of red and green light-emitting devices were 50 and 30 cd/m (2), respectively, under an applied voltage of 250 V0-p (5 kHz sinusoidal v oltage). Technical data on the fabrication of the thin film UV-EL device to gether with RGB visible-light PL layers are presented. Research and develop ment efforts on the optimum design and optoelectronic performance and relat ed characterizations are also described and discussed. It is believed that there will be a tremendous demand fur the developed device which has a much higher picture element resolution and the possibility of a higher brightne ss as compared with recently introduced plasma display panels (PDPs).