Joled Inc.

Panasonic Corporation

Yoshiaki Tsukamoto

Satoru Ohuchi

Shinya Fujimura

Takahiro Komatsu

Hirofumi Fujita

Seiji Nishiyama

Kenji Harada

Takayuki Takeuchi

Kei Sakanoue

Ryuuta Yamada

Keiko Kurata

An organic EL element includes a hole injection layer that yields excellent hole conduction efficiency. The organic EL element includes an anode, a cathode, and functional layers that include organic material between the anode the cathode. The functional layers include a hole injection layer that injects holes into the functional layers. The hole injection layer is a metal oxide film that includes a metal oxide. The metal atoms constituting the metal oxide include both metal atoms at a maximum valence thereof and metal atoms at a valence less than the maximum valence, and the metal oxide film includes metal oxide crystals having a particle diameter on the order of nanometers.

Organic el element, organic el panel, organic el light-emitting apparatus, organic el display apparatus, and method of manufacturing organic el element

An organic EL element includes: an anode; a cathode; a buffer layer; and a hole injection layer between the anode and the buffer layer, the hole injection layer including a nickel oxide including both nickel atoms with a valence of three and nickel atoms with a valence of two. In the hole injection layer, a ratio of the number of nickel atoms with a valence of three to the number of nickel atoms with a valence of two, expressed in percentage, is equal to or greater than 60%.

Organic EL element, organic EL panel having organic EL element, organic EL light-emitting apparatus, and organic EL display apparatus

An organic EL element comprises: an anode; a cathode; a buffer layer; and a hole injection layer between the anode and the buffer layer. The hole injection layer includes a nickel oxide that includes both nickel atoms with a valence of three and nickel atoms with a valence of two. At least part of the hole injection layer has a crystal structure ANiOthat includes nickel, a metal element A, and oxygen, the nickel including nickel atoms with a valence of three, and the metal element A differing from nickel and including metal A atoms with a valence of three.

An organic EL element comprises: an anode; a cathode; a functional layer including 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. Tungsten atoms constituting the tungsten oxide include both tungsten atoms with a valence of six and tungsten atoms with a valence less than six. The hole injection layer includes a crystal of the tungsten oxide. A particle diameter of the crystal is on an order of nanometers. The hole injection layer has a recessed portion whose inner side surface has an upper edge that is one of (i) aligned with part of a lower edge of the bank, the part being in contact with the light-emitting layer, and (ii) in contact with a bottom surface of the bank.

Organic electroluminescence element and method of manufacturing thereof

An organic light-emitting element comprising: an anode; a cathode; banks; a functional layer between the anode and the cathode; and a hole injection layer between the anode and the functional layer. The functional layer includes one or more sublayers including a light-emitting sublayer defined by the banks and that contains an organic material. The hole injection layer comprises tungsten oxide, includes an occupied energy level that is approximately 1.8 electron volts to approximately 3.6 electron volts lower than a lowest energy level of a valence band of the hole injection layer in terms of a binding energy, has a surface facing the functional layer, and has a recessed structure such that a portion of the surface overlapping with the light-emitting sublayer is located closer to the anode than other portions. The recessed structure has a recessed portion whose inner surface is in contact with the functional layer.

Organic electroluminescence element

An organic light-emitting element comprising: an anode; a cathode; banks; a functional layer between the anode and the cathode; and a hole injection layer between the anode and the functional layer. The functional layer includes at least a light-emitting sublayer defined by the banks and that contains an organic material. The hole injection layer comprises tungsten oxide and includes a crystal of the tungsten oxide, whose particle diameter is on an order of nanometers. Tungsten atoms constituting the tungsten oxide include both tungsten atoms with a valence of six and tungsten atoms with a valence less than six. The hole injection layer has a surface facing the functional layer, and a portion of the surface overlapping with the light-emitting sublayer is located closer to the anode than other portions, thereby forming a recessed structure having a recessed portion whose inner surface is in contact with the functional layer.

In an organic EL element, a bank is formed on a hole injection layer so as to surround light-emitting layer. The hole injection layer is formed with a tungsten oxide thin film, and has, in an electronic state thereof, an occupied energy level 1.8 eV to 3.6 eV lower than the lowest energy level of a valence band of the hole injection layer. The hole injection layer has a recessed portion in an upper surface thereof. An inner surface of the recessed portion is in contact with a functional layer (light-emitting layer). the inner side surface of the recessed portion includes an upper edge that is one of aligned with part of a lower edge of the bank, the part being in contact with the functional layer, and in contact with a bottom surface of the bank.

Organic EL element

An organic electroluminescent (EL) element comprises: an anode; a cathode; a functional layer disposed between the anode and the cathode, and including a light-emitting layer containing an organic material; a hole injection layer disposed between the anode and the functional layer; and a bank that defines an area in which the light-emitting layer is to be formed, wherein the hole injection layer includes tungsten oxide and includes an occupied energy level that is approximately 1.8 electron volts to approximately 3.6 electron volts lower than a lowest energy level of a valence band of the hole injection layer in terms of a binding energy, the hole injection layer has a recess in an upper surface of the area defined by the bank, and an upper peripheral edge of the recess is covered with a part of the bank.

An organic EL panel comprises anodes, a cathode, organic light-emitting layers, and first functional layers each including a hole injection layer and a hole transport layer. The hole injection layer of each of the R, G, and B colors is made of only a metal oxide including tungsten oxide, and has a thickness of 5 nm to 40 nm. At least one of the hole injection layers has a thickness different from the other hole injection layers. The hole transport layers of the R, G, and B colors are equivalent in thickness. The organic light-emitting layers of the R, G, and B colors are equivalent in thickness.

Organic electroluminescence panel, method of manufacturing organic electroluminescence panel, organic light emitting apparatus using organic electroluminescence panel, and organic display apparatus using organic electroluminescence panel

An organic EL element includes a hole injection layer yielding excellent hole conduction efficiency, and comprises: an anode; a cathode; a functional layer disposed between the anode and the cathode, and including a light-emitting layer containing organic material; the hole injection layer disposed between the anode and the functional layer; and a bank defining an area in which the light-emitting layer is to be formed, wherein the hole injection layer includes tungsten oxide, tungsten atoms constituting the tungsten oxide include both tungsten atoms with a valence of six and tungsten atoms with a valence less than six, the hole injection layer includes a crystal of the tungsten oxide, a particle diameter of the crystal being on an order of nanometers, an inner portion of the hole injection layer is depressed to define a recess, and an upper peripheral edge of the recess is covered with a part of the bank.

Organic EL element and production method for same

An organic light-emitting element includes an anode, a functional layer, and a hole injection layer between the anode and the functional layer. The functional layer contains an organic material. The hole injection layer injects holes to the functional layer. The hole injection layer comprises tungsten oxide and includes an occupied energy level that is approximately 1.8 electron volts to approximately 3.6 electron volts lower than a lowest energy level of a valence band of the hole injection layer in terms of binding energy.

Growing community of inventors

Osaka, Japan

Yoshiaki Tsukamoto