FLUORESCENT SUBSTANCE AND PROCESS FOR PRODUCING THE SAME, AND PARTICLE DISPERSION-TYPE EL DEVICE US

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A fluorescent substance for EL, which internally contains an electrically conductive phase containing a carbon component such as a carbon nanotube or a carbon nanohorn, is provided. The fluorescent substance internally containing an electrically conductive phase is a sulfide composed mainly of Ag- or Cu-activated ZnS, particularly a fluorescent substance of general formula Zn(1-x)AxS : Ag/Cu, D wherein A represents at least one group 2A element selected from the group consisting of Be, Mg, Ca, Sr and Ba; D represents a coactivator and is at least one element selected from the group consisting of group 3B and 7B elements; and 0 = x < 1, or an amorphous oxynitride-based fluorescent substance of a B-N-O, Si-O-N, Al-O-N, Ga-O-N, Al-Ga-O-N, In-Ga-O-N, or In-Al-O-N system activated with a rare earth ion such as Eu2+, Gd3+, or Yb2+. A surface luminous body prepared by the above fluorescent body can provide a particle dispersion-type EL device which emits high-luminescence intensity ultraviolet light or visible light close thereto by electric field excitation through the internal incorporation of the electrically conductive phase. © KIPO & WIPO 2007