Organic light-emitting device having homogenous brightness distribution
View Patent ↗An organic light-emitting device comprising an active layer for producing radiation having a first side surface and a second side surface adjoining a corner edge. A first contact strip extends along the first side surface for injecting charge carriers of a first type into the active layer. A second contact strip extends along the second side surface for injecting charge carriers of a second type into the active layer. The first side surface has a recessed region adjoining the corner edge, and the injection of charge carriers from the first contact strip is suppressed in the recessed region.
1. An organic light-emitting device comprising:
an active layer configured to produce radiation having a first side surface and a second side surface adjoining a corner edge;
a first contact strip extending along the first side surface configured to inject charge carriers of a first type into the active layer; and
a second contact strip extending along the second side surface configured to inject charge carriers of a second type into the active layer,
wherein:
the first side surface has a recessed region adjoining the corner edge and configured so the injection of charge carriers from the first contact strip is suppressed in the recessed region,
the active layer comprises a first main surface and a second main surface, and a first contact connection comprising the first contact strip extends over the first main surface and a second contact connection comprising the second contact strip extends over the second main surface, and
the first contact connection has a conductivity profile, the conductivity decreasing from a center of the first side surface toward the recessed region.
2. The organic light-emitting device as claimed in claim 1 , the first contact strip being electrically contacted by the first side surface only outside the recessed region.
3. The organic light-emitting device as claimed in claim 1 , the injection of charge carriers from the first contact strip being completely suppressed in the recessed region.
4. The organic light-emitting device as claimed in claim 1 , a gap being formed along the recessed region between the first contact strip and the active layer.
5. The organic light-emitting device as claimed in claim 1 , the second side surface having a second recessed region adjoining the corner edge and the injection of charge carriers from the second contact strip being completely suppressed in the second recessed region.
6. The organic light-emitting device as claimed in claim 1 , the first contact connection comprising a conductive oxide.
7. The organic light-emitting device as claimed in claim 1 , the first contact connection comprising a metal or a metal alloy.
8. The organic light-emitting device as claimed in claim 1 , the first contact connection having a first surface conductivity and the second contact connection having a second surface conductivity and the first surface conductivity and the second surface conductivity differing by not more than a factor of 10.
9. The organic light-emitting device as claimed in claim 1 , which is configured as a transparent OLED.
10. The organic light-emitting device as claimed in claim 1 , which is configured as a bottom-emitter OLED.
11. The organic light-emitting device as claimed in claim 6 , wherein said conductive oxide is tin oxide.