ORGANIC EL ELEMENT, DISPLAY DEVICE, AND LIGHT-EMITTING DEVICE

An organic EL element comprising: an anode; a cathode; banks; a functional layer between the anode and the cathode, the functional layer including one or more sublayers including a light-emitting sublayer, the light-emitting sublayer defined by the banks and containing an organic material; and a hol...

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Main Authors FUJIMURA SHINYA, NISHIYAMA SEIJI, KOMATSU TAKAHIRO, TAKEUCHI TAKAYUKI, FUJITA HIROFUMI, HARADA KENJI, OHUCHI SATORU
Format Patent
LanguageEnglish
Published 23.05.2013
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
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Summary:An organic EL element comprising: an anode; a cathode; banks; a functional layer between the anode and the cathode, the functional layer including one or more sublayers including a light-emitting sublayer, the light-emitting sublayer defined by the banks and containing an organic material; and a hole injection layer between the anode and the functional layer, wherein the hole injection layer comprises tungsten oxide. An Ultraviolet Photoelectron Spectroscopy (UPS) spectrum, obtained from a UPS measurement, has a protrusion appearing near a Fermi surface and within a region corresponding to a binding energy range lower than a top of a valence band. The tungsten oxide contained in the hole injection layer satisfies a condition, determined from an X-ray Photoelectron Spectroscopy (XPS) measurement, that a ratio in a number density of atoms other than tungsten atoms and oxygen atoms to the tungsten atoms does not exceed approximately 0.83.
Bibliography:Application Number: US201313742575