ORGANIC EL ELEMENT AND PRODUCTION METHOD FOR SAME
First Claim
1. An organic electroluminescent (EL) element, comprising:
- 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, whereinthe hole injection layer includes a 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, andan upper peripheral edge of the recess is covered with a part of the bank.
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Accused Products
Abstract
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.
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Citations
26 Claims
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1. An organic electroluminescent (EL) element, comprising:
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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 a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of manufacturing an organic EL element, comprising the steps of:
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preparing an anode; forming a tungsten oxide layer on the anode using a sputtering gas including argon gas and oxygen gas and using tungsten as a sputtering target, under film forming conditions such that a total pressure of the sputtering gas is at least 2.3 Pa and at most 7.0 Pa, a partial pressure of the oxygen gas in the sputtering gas is at least 50% and at most 70%, an input power density per unit area of the sputtering target is at least 1.5 W/cm2 and at most 6.0 W/cm2, and a value yielded by dividing the total pressure of the sputtering gas by the input power density is larger than 0.7 Pa·
cm2/W;forming a bank material layer containing material constituting a bank above the tungsten oxide layer; forming a recess by removing a portion of the bank material layer so that the tungsten oxide layer is partially exposed and an upper surface of the tungsten oxide layer in the recess is closer to the anode than an upper peripheral edge of the recess, the recess having an inner bottom surface and an inner side surface that is continuous with the inner bottom surface; heat-treating a remaining portion of the bank material layer, the remaining portion of the bank material layer being made fluid so that the bank material layer extends to cover the upper peripheral edge of the recess; forming functional layer including a light-emitting layer above an exposed surface of the tungsten oxide layer after the heat treatment; and forming a cathode above the functional layer. - View Dependent Claims (25, 26)
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Specification