PURPOSE: To lower current density and obtain a dispersion-type EL luminescent body with high luminance efficiency and improved luminance irregularity by allowing a surfactant to exist on a luminescent layer formed with a mixture consisting of an organic binder and a phosphor substance.
CONSTITUTION: In the case of dispersing a phosphor substance in an organic binder and forming a film, a surfactant is allowed to exist in the phosphor substance and the organic binder and/or a surfactant is allowed to exist in a highly dielectric substance such as a barium titanate power, etc., and the organic binder. The surfactant-containing mixture is applied to a back side electrode 1, or an insulating layer 2, or a substrate film with a desired thickness to give an insulating layer 2 and a luminescent layer 3 and then a transparent electrode layer 4 of ITO, etc., is formed. If necessary, a humidity absorbing film 5 is formed further to cover them and the whole body is sealed with a humidity proof film 6. In this way, irregularity of luminance is eliminated and high luminance, high efficiency, low driving voltage, etc., are achieved.
WO/2004/098242 | LIGHT-EMITTING DEVICE |
WO/2013/096918 | CROSSLINKING TRISCARBAZOLE HOLE TRANSPORT POLYMERS |
JP2003059668 | ORGANIC LIGHT-EMITTING DEVICE |
NAKATSUKA KIYOHARU