Organic electroluminescence element and production method therefor
View Patent ↗The organic electroluminescence element of the present invention includes: a first substrate; a second substrate facing the first substrate; an element member between the first and second substrates; first and second extension electrodes on first and second inner surfaces of the first and second substrates facing the element member; and an insulating member having an electrically insulating property. The element member includes: a functional layer including a light-emitting layer and having first and second surfaces in a thickness direction; and first and second electrode layers on the respective first and second surfaces of the functional layer. The element member is between the first and second extension electrodes such that parts of the first and second electrode layers are in contact with the first and second extension electrodes respectively. The insulating member is between the first and second inner surfaces of the respective first and second substrates.
1. An organic electroluminescence element comprising:
a first substrate;
a second substrate positioned to face the first substrate;
an element member between the first substrate and the second substrate;
a first extension electrode formed on a first inner surface of the first substrate facing the element member;
a second extension electrode formed on a second inner surface of the second substrate facing the element member; and
an insulating member having an electrically insulating property,
wherein:
the element member includes
a functional layer including a light-emitting layer and having a first surface and a second surface in a thickness direction,
a first electrode layer positioned on the first surface of the functional layer, and
a second electrode layer positioned on the second surface of the functional layer;
the element member is between the first extension electrode and the second extension electrode such that a part of the first electrode layer is in contact with the first extension electrode and a part of the second electrode layer is in contact with the second extension electrode;
the insulating member is between the first inner surface of the first substrate and the second inner surface of the second substrate;
the second electrode layer is designed to allow passage of light emitted from the light-emitting layer;
the second substrate is designed to allow passage of light emitted from the light-emitting layer;
the second electrode layer includes
a patterned electrode, and
an electrically conductive layer made of material allowing passage of light emitted from the light-emitting layer;
the patterned electrode includes
an electrode part covering the second surface of the functional layer, and
an opening part formed in the electrode part to expose the second surface of the functional layer;
the electrically conductive layer is between the second surface of the functional layer and the patterned electrode so as to cover the second surface of the functional layer; and
the electrode part of the patterned electrode of the second electrode layer is in direct contact with the second extension electrode.
2. The organic electroluminescence element as set forth in claim 1 , wherein:
a shortest distance between the first extension electrode and the second electrode layer is longer than a shortest distance between the first electrode layer and the second electrode layer; and
a shortest distance between the second extension electrode and the first electrode layer is longer than a shortest distance between the second electrode layer and the first electrode layer.
3. The organic electroluminescence element as set forth in claim 1 , further comprising a hygroscopic member absorbing moisture,
wherein the hygroscopic member is between the first electrode layer and the first substrate.
4. The organic electroluminescence element as set forth in claim 1 , further comprising a resin layer allowing passage of light emitted from the light-emitting layer,
wherein:
the resin layer is between the second electrode layer and the second substrate; and
the resin layer has a refractive index equal to a refractive index of the electrically conductive layer or more.
5. The organic electroluminescence element as set forth in claim 1 , wherein
the first electrode layer is designed to reflect light emitted from the light-emitting layer.
6. The organic electroluminescence element as set forth in claim 1 , wherein
the first extension electrode and the second extension electrode are arranged not to face each other.
7. The organic electroluminescence element as set forth in claim 1 , wherein
the insulating member, the first substrate, and the second substrate are designed to constitute a housing designed to enclose the element member in an air-tight manner.
8. The organic electroluminescence element as set forth in claim 1 , further comprising a first terminal,
wherein:
the first substrate has a first outer surface which is an opposite surface of the first substrate from the first inner surface;
the first terminal is formed on the first outer surface of the first substrate; and
formed in the first substrate is a first through wire electrically connecting the first extension electrode to the first terminal.
9. The organic electroluminescence element as set forth in claim 1 , wherein
the second substrate includes an aperture exposing the first extension electrode.
10. The organic electroluminescence element as set forth in claim 1 , further comprising a first terminal formed on a side surface of the first substrate,
wherein the first extension electrode is electrically connected to the first terminal.
11. The organic electroluminescence element as set forth in claim 1 , further comprising a second terminal,
wherein:
the second substrate has a second outer surface which is an opposite surface of the second substrate from the second inner surface;
the second terminal is formed on the second outer surface of the second substrate; and
formed in the second substrate is a second through wire electrically connecting the second extension electrode to the second terminal.
12. The organic electroluminescence element as set forth in claim 1 , wherein the first substrate includes an aperture exposing the second extension electrode.
13. The organic electroluminescence element as set forth in claim 1 , further comprising a second terminal formed on a side surface of the second substrate,
wherein the second extension electrode is electrically connected to the second terminal.
14. The organic electroluminescence element as set forth in claim 1 , wherein:
the first extension electrode is separated from the second substrate; and
the second extension electrode is separated from the first substrate.
15. The organic electroluminescence element as set forth in claim 1 , wherein a thickness of the insulating member is greater than a width of the insulating member.
16. The organic electroluminescence element as set forth in claim 1 , wherein at least a portion of the insulating member is in direct contact with at least one of the first and second substrates.
17. A production method for an organic electroluminescence element comprising steps of:
preparing an element member which includes: a functional layer including a light-emitting layer and having a first surface and a second surface in a thickness direction; a first electrode layer positioned on the first surface of the functional layer; and a second electrode layer positioned on the second surface of the functional layer;
preparing a first substrate on which a first extension electrode is formed and a second substrate on which a second extension electrode is formed;
subsequent to preparing the element member and preparing the first and second substrates, arranging the element member, the first substrate, and the second substrate in such a manner that the element member is between the first extension electrode and the second extension electrode such that a part of the first electrode layer is in contact with the first extension electrode and a part of the second electrode layer is in contact with the second extension electrode; and
bonding the first substrate to the second substrate with an insulating member having an electrically insulating property
wherein:
the second electrode layer is designed to allow passage of light emitted from the light-emitting layer;
the second substrate is designed to allow passage of light emitted from the light-emitting layer;
the second electrode layer includes
a patterned electrode, and
an electrically conductive layer made of material allowing passage of light emitted from the light-emitting layer;
the patterned electrode includes
an electrode part covering the second surface of the functional layer, and
an opening part formed in the electrode part to expose the second surface of the functional layer;
the electrically conductive layer is between the second surface of the functional layer and the patterned electrode so as to cover the second surface of the functional layer; and
the electrode part of the patterned electrode of the second electrode layer is in direct contact with the second extension electrode.
18. The production method for the organic electroluminescence element as set forth in claim 17 , wherein:
the first extension electrode is separated from the second substrate; and
the second extension electrode is separated from the first substrate.