US2009284141A1PendingUtilityA1

Organic electroluminescence element and manufacturing method thereof

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Assignee: PANASONIC CORPPriority: May 13, 2008Filed: May 13, 2009Published: Nov 19, 2009
Est. expiryMay 13, 2028(~1.8 yrs left)· nominal 20-yr term from priority
Inventors:Kei SakanoueTakahiro KomatsuTakayuki TakeuchiKenji Harada
H10K 50/181H10K 85/1135H10K 50/18H10K 2102/103H10K 85/115H10K 59/12H10K 85/151H10K 50/17
57
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Claims

Abstract

To improve the light emission characteristics of a device when a transition metal oxide is used for the hole injection layer, in particular, to enhance the electron blocking characteristics of a transition metal oxide. An organic electroluminescence element comprising an anode, a cathode and a plurality of functional layers formed between the anode and the cathode, the functional layer containing a layer with a light-emitting function composed of at least one kind of an organic semiconductor and, between the anode and the layer with a light-emitting function, a charge injection layer composed of at least one kind of a transition metal oxide, wherein the ratio of the metal to oxygen at the anode side of the transition metal oxide layer is smaller than the stoichiometric ratio and at the same time, the ratio of the metal to oxygen at the layer with a light-emitting function side is greater than that at the anode side.

Claims

exact text as granted — not AI-modified
1 - 15 . (canceled) 
   
   
       16 . An organic electroluminescence element comprising:
 an anode;   a cathode;   a plurality of functional layers formed between the anode and the cathode, the functional layer including a layer with a light-emitting function formed from at least one kind of an organic semiconductor,   a charge injection layer formed between the anode and the layer with a light-emitting function and formed of at least one kind of a transition metal oxide, wherein   a ratio of the transition metal to oxygen at the anode side in the transition metal oxide layer is smaller than a stoichiometric ratio and a ratio of the transition metal to oxygen at the layer with a light-emitting function side is greater than that at the anode side.   
   
   
       17 . The organic electroluminescence element according to  claim 16 , wherein the transition metal oxide layer is a transition metal oxide layer formed by performing a surface oxidation treatment after film formation. 
   
   
       18 . The organic electroluminescence element according to  claim 17 , wherein the transition metal oxide layer contains a transition metal oxide layer which surface is oxidized by a heat treatment. 
   
   
       19 . The organic electroluminescence element according to  claim 17 , wherein said transition metal oxide layer contains a transition metal oxide layer which surface is oxidized by an ultraviolet treatment. 
   
   
       20 . The organic electroluminescence element according to  claim 17 , wherein the transition metal oxide layer contains a transition metal oxide layer which surface is oxidized with an oxygen-containing plasma. 
   
   
       21 . The organic electroluminescence element according to  claim 16 , wherein the transition metal oxide layer is formed by a dry process. 
   
   
       22 . The organic electroluminescence element according to  claim 17 , wherein the transition metal oxide layer is formed by a dry process. 
   
   
       23 . The organic electroluminescence element according to  claim 18 , wherein the transition metal oxide layer is formed by a dry process. 
   
   
       24 . The organic electroluminescence element according to  claim 19 , wherein the transition metal oxide layer is formed by a dry process. 
   
   
       25 . The organic electroluminescence element according to  claim 20 , wherein the transition metal oxide layer is formed by a dry process. 
   
   
       26 . The organic electroluminescence element according to  claim 16 , wherein out of the transition metal oxide layer, the transition metal oxide layer positioned on the anode side has a specific resistance of 1×10 exp(5)Ωcm or more. 
   
   
       27 . The organic electroluminescence element according to  claim 17 , wherein out of the transition metal oxide layer, the transition metal oxide layer positioned on the anode side has a specific resistance of 1×10 exp(5)Ωcm or more. 
   
   
       28 . The organic electroluminescence element according to  claim 18 , wherein out of the transition metal oxide layer, the transition metal oxide layer positioned on the anode side has a specific resistance of 1×10 exp(5) Ωcm or more. 
   
   
       29 . The organic electroluminescence element according to  claim 19 , wherein out of the transition metal oxide layer, the transition metal oxide layer positioned on the anode side has a specific resistance of 1×10 exp(5)Ωcm or more. 
   
   
       30 . The organic electroluminescence element according to  claim 20 , wherein out of the transition metal oxide layer, the transition metal oxide layer positioned on the anode side has a specific resistance of 1×10 exp(5)Ωcm or more. 
   
   
       31 . The organic electroluminescence element according to  claim 16 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       32 . The organic electroluminescence element according to  claim 17 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       33 . The organic electroluminescence element according to  claim 18 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       34 . The organic electroluminescence element according to  claim 19 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       35 . The organic electroluminescence element according to  claim 20 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       36 . The organic electroluminescence element according to  claim 21 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       37 . The organic electroluminescence element according to  claim 22 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       38 . The organic electroluminescence element according to  claim 23 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       39 . The organic electroluminescence element according to  claim 24 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       40 . The organic electroluminescence element according to  claim 25 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       41 . The organic electroluminescence element according to  claim 26 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       42 . The organic electroluminescence element according to  claim 27 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       43 . The organic electroluminescence element according to  claim 28 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       44 . The organic electroluminescence element according to  claim 29 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       45 . The organic electroluminescence element according to  claim 30 , wherein the transition metal oxide layer is integrally formed across a plurality of picture elements. 
   
   
       46 . The organic electroluminescence element according to  claim 16 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       47 . The organic electroluminescence element according to  claim 17 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       48 . The organic electroluminescence element according to  claim 18 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       49 . The organic electroluminescence element according to  claim 19 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       50 . The organic electroluminescence element according to  claim 20 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       51 . The organic electroluminescence element according to  claim 21 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       52 . The organic electroluminescence element according to  claim 22 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       53 . The organic electroluminescence element according to  claim 23 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       54 . The organic electroluminescence element according to  claim 24 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       55 . The organic electroluminescence element according to  claim 25 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       56 . The organic electroluminescence element according to  claim 26 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       57 . The organic electroluminescence element according to  claim 27 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       58 . The organic electroluminescence element according to  claim 28 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       59 . The organic electroluminescence element according to  claim 29 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       60 . The organic electroluminescence element according to  claim 30 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       61 . The organic electroluminescence element according to  claim 31 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       62 . The organic electroluminescence element according to  claim 32 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       63 . The organic electroluminescence element according to  claim 33 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       64 . The organic electroluminescence element according to  claim 34 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       65 . The organic electroluminescence element according to  claim 35 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       66 . The organic electroluminescence element according to  claim 36 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       67 . The organic electroluminescence element according to  claim 37 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       68 . The organic electroluminescence element according to  claim 38 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       69 . The organic electroluminescence element according to  claim 39 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       70 . The organic electroluminescence element according to  claim 40 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       71 . The organic electroluminescence element according to  claim 41 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       72 . The organic electroluminescence element according to  claim 42 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       73 . The organic electroluminescence element according to  claim 43 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       74 . The organic electroluminescence element according to  claim 44 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       75 . The organic electroluminescence element according to  claim 45 , wherein the visible light transmittance of the metal oxide layer is 70% or more. 
   
   
       76 . A method for manufacturing an electroluminescence element which comprises an anode; a cathode; a plurality of functional layers formed between the anode and the cathode, the functional layer including a layer with a light-emitting function formed of at least one kind of an organic semiconductor; and a charge injection layer formed between the anode and the layer with a light-emitting function and formed from at least one kind of a transition metal oxide layer, the method comprising:
 the step of forming the transition metal oxide layer is a step of forming the transition metal oxide layer such that the ratio of the metal to oxygen at the anode side in the transition metal oxide layer is smaller than the stoichiometric ratio and the ratio of the metal to oxygen at the layer with a light-emitting function side is greater than that at the anode side.   
   
   
       77 . The method for manufacturing an organic electroluminescence element according to  claim 76 , wherein
 the step of forming said transition metal oxide layer contains a step of film-forming a transition metal oxide layer and a surface oxidation treatment step of oxidizing the surface of said transition metal oxide layer.   
   
   
       78 . The method for manufacturing an organic electroluminescence element according to  claim 77 , wherein
 the surface oxidation treatment step contains a step of oxidatively treating the surface by a heat treatment.   
   
   
       79 . The method for manufacturing an organic electroluminescence element according to  claim 77 , wherein
 the surface oxidation treatment step contains a step of oxidatively treating the surface by an ultraviolet treatment.   
   
   
       80 . The method for manufacturing an organic electroluminescence element according to  claim 77 , wherein
 the surface oxidation treatment step contains a step of oxidatively treating the surface with an oxygen-containing plasma.   
   
   
       81 . The method for manufacturing an organic electroluminescence element according to  claim 76 , wherein
 the step of forming said transition metal oxide layer is a dry process.   
   
   
       82 . The method for manufacturing an organic electroluminescence element according to  claim 77 , wherein
 the step of forming said transition metal oxide layer is a dry process.   
   
   
       83 . The method for manufacturing an organic electroluminescence element according to  claim 78 , wherein
 the step of forming said transition metal oxide layer is a dry process.   
   
   
       84 . The method for manufacturing an organic electroluminescence element according to  claim 79 , wherein
 the step of forming said transition metal oxide layer is a dry process.   
   
   
       85 . The method for manufacturing an organic electroluminescence element according to  claim 80 , wherein
 the step of forming said transition metal oxide layer is a dry process.

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