Organic EL element, display device, and light-emitting device

US9012897B2 · kind B2 · utility

Assignee

• PANASONIC HOLDINGS CORPORATION · JP

Inventors

• Kenji Harada · Kasai, JP
• Seiji Nishiyama · Hirakata, JP
• Takahiro Komatsu · Kasai, JP
• Takayuki Takeuchi · Kasai, JP
• Satoru Ohuchi · Osaka, JP
• Hirofumi Fujita · Osaka, JP
• Shinya Fujimura · Susono, JP

Key dates

• Filing date: Jan 22, 2013
• Grant date: Apr 21, 2015
• Expiry date: Jan 22, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K50/856

Abstract

An organic EL element comprises: an anode; a cathode; a functional layer that is disposed between the anode and the cathode and includes at least a light-emitting layer; a hole injection layer disposed between the anode and the functional layer; and a bank. The hole injection layer contains tungsten oxide, and has a recessed portion. A UPS spectrum of the hole injection layer, 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 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.