Organic electroluminescence device and method of producing organic device
View Patent ↗To provide an organic electroluminescence device that can suppress rise in the driving voltage at the time of constant-current energization and degradation in brightness at the time of energization, and thus excels in its driving lifetime, the organic electroluminescence device comprises: a substrate; an anode and a cathode overlying the substrate; and a plurality of organic layers disposed between the anode and the cathode, and the plurality of organic layers comprise at least: a first layer formed by means of polymerization of a polymerizable compound; and a second layer disposed adjacently to the first layer and containing a polymerization initiator.
1. A method of producing an organic device comprising a plurality of organic layers comprising at least a first layer formed by polymerization of a polymerizable compound, a second layer disposed adjacent to said first layer and comprising a polymerization initiator and an emitting layer; a substrate; and an anode and a cathode overlying said substrate, said method comprising:
forming said second layer through film formation using a composition comprising a polymerization initiator;
forming a layer comprising said polymerizable compound through film formation using a composition comprising said polymerization compound and which is free from a polymerization initiator; and
forming said first layer by polymerization of said polymerizable compound by activating said polymerization initiator,
wherein said emitting layer, said first layer and said second layer are arranged in the listed order,
said plurality of organic layers comprising said first layer, and said second layer are formed between said anode and said cathode and
said polymerization initiator has a molecular weight of 3,000 or less.
2. An organic electroluminescence device produced by the method of claim 1 .
3. The organic electroluminescence device according to claim 2 , wherein said first layer is a hole-transport layer, and said second layer is hole-injection layer.
4. The method of producing an organic device of claim 1 , wherein a content of said polymerization initiator in said second layer is 0.1 weight % or higher.
5. A method of producing an electroluminescence device comprising:
a substrate, an anode and a cathode overlying said substrate; an emitting layer disposed between said anode and said cathode; a polymerized layer formed by polymerization of a polymerizable compound and an adjacent layer at an opposite side to said emitting layer and comprising a polymerization initiator, said method comprising:
forming said adjacent layer through film formation using a composition comprising a polymerization initiator;
forming a layer comprising said polymerizable compound through film formation using a composition comprising said polymerization compound and which is free from a polymerization initiator; and
forming said polymerized layer by polymerization of said polymerizable compound by activating said polymerization initiator,
wherein said emitting layer, said polymerized layer and said adjacent second layer are formed between said anode and said cathode, and said polymerization initiator has a molecular weight of 3,000 or less,
a ratio between QB and QA meets the condition of
QB/QA< 0.5,
where QA (%) is the ratio of the number of molecules of said polymerization initiator contained in the surface part of said adjacent layer at the side of said polymerized layer, measured by means of XPS method, to the number of molecules of the component other than said polymerization initiator, contained in the surface part of said adjacent layer at the side of said polymerized layer, measured by means of XPS method, and
QB (%) is the ratio of the number of molecules of said polymerization initiator contained in the surface part of said polymerized layer at the side of said emitting layer, measured by means of XPS method, to the number of molecules of the component other than said polymerization initiator, contained in the surface part of said polymerized layer at the side of said emitting layer, measured by means of XPS method.
6. An organic electroluminescence device produced by the method of claim 5 .
7. The organic electroluminescence device according to claim 5 , wherein said polymerized layer is a hole-transport layer, and said adjacent layer is hole-injection layer.
8. The method of producing an organic device of claim 5 , wherein a content of said polymerization initiator in said second layer is 0.1 weight % or higher.