ORGANIC ELECTROLUMINESCENT ELEMENT, LIGHTING DEVICE AND DISPLAY DEVICE
申请人:Naito Mitsuyoshi
公开号:US20090200925A1
公开(公告)日:2009-08-13
Provided is a means to obtain long lifetime of an organic EL element, and a long lifetime lighting device and a long lifetime display device utilizing the means are further provided. Disclosed is an organic electroluminescent element comprising an emission layer containing a host material and a dopant material, and a hole transport layer, provided between cathode and anode facing each other, wherein an intermediate layer is provided on an anode side of the emission layer so as to be brought into contact with the emission layer, and the hole transport layer is provided on the anode side of the intermediate layer, satisfying the following Formulae E1E4, where E1 represents an ionization potential of a hole transport material, E2 represents an ionization potential of an intermediate material, E3 represents an ionization potential of the host material, and E4 represents an ionization potential of the dopant material.
ORGANIC ELECTROLUMINESCENT ELEMENT, DISPLAY DEVICE AND ILLUMINATING DEVICE
申请人:Otsu Shinya
公开号:US20100231123A1
公开(公告)日:2010-09-16
Disclosed is an organic electroluminescent element having high luminous efficiency and long life. Also disclosed are a display device and an illuminating device respectively using such an organic electroluminescent element. Specifically disclosed is an organic electroluminescent element comprising an electrode and at least one or more organic layers on a substrate. This organic electroluminescent element is characterized in that at least one of the organic layers is a light-emitting layer containing a phosphorescent compound and a host compound, the phosphorescent compound has a HOMO of −5.15 to −3.50 eV and a LUMO of from −1.25 to +1.00 eV, and the host compound has a 0-0 band of the phosphorescence spectrum at not more than 460 nm and a glass transition temperature of not less than 60° C.