MULTI-LAYERED WHITE FLUORESCENT FILM HAVING SAME BASE MATERIAL AND AC DRIVE TYPE TFELD USING THE SAME

摘要

PURPOSE: A multi-layered white fluorescent film having same base material and an AC drive type TFELD(thin film electroluminescent device) using the same are provided to be capable of easily adjusting voltage required to lighten the electroluminescent device and of improving blue color purity and brightness portions to realize white color having wide color gamut. CONSTITUTION: The white fluorescent film has a laminated structure of a CaS:Pb blue fluorescent film(4), a CaS:Pb green fluorescent film(5) and a CaS:Eu red fluorescent film(6). The AC drive type TFELD has a laminated structure in which a transparent electrode(2), a lower insulator(3), the white fluorescent film(4,5,6) of multi-layered structure, an upper insulator(7) and a metal electrode(8) are sequentially stacked on a transparent substrate(1). An ITO(Indium tin oxide) or ZnO:Al(aluminum-doped zinc oxide) is used as the transparent electrode(2), and Au or Al having an excellent reflective factor can be as the metal electrode(8).