Organic light-emitting component having a layer with a low absorption coefficient
View Patent ↗An organic light-emitting component includes a substrate, on which are applied an optical coupling-out layer, a translucent electrode on the coupling-out layer, an organic hole-conducting layer or an organic electron-conducting layer on the translucent electrode, an organic light-emitting layer thereon, an organic electron-conducting layer or an organic hole-conducting layer on the organic light-emitting layer, and a reflective electrode. The organic light-emitting layer is at a distance of greater than or equal to 150 nm from the reflective electrode.
1. An organic light-emitting component comprising:
a translucent substrate;
an optical coupling-out layer overlying the translucent substrate;
a translucent electrode overlying the coupling-out layer;
an organic functional layer stack having organic functional layers, the organic functional layer stack comprising:
an organic hole-conducting layer or an organic electron-conducting layer overlying the translucent electrode,
an organic light-emitting layer overlying the hole-conducting layer or overlying the organic electron-conducting layer, and
an organic electron-conducting layer or an organic hole-conducting layer; and
a reflective electrode,
wherein the organic light-emitting layer is at a distance of greater than or equal to 150 nm from the reflective electrode, and
wherein the electron-conducting layer or the hole-conducting layer is arranged between the reflective electrode and the light-emitting layer, is thicker than 5 nm, has an absorption coefficient k of less than or equal to 0.005 for wavelengths of greater than 450 nm, and is doped.
2. The component according to claim 1 , wherein the organic hole-conducting layer or the organic electron-conducting layer comprises an organic hole-conducting layer, and wherein the organic electron-conducting layer or the organic hole-conducting layer comprises an organic electron-conducting layer.
3. The component according to claim 1 , wherein, at a wavelength of 600 nm, an optical length between the light-emitting layer and the reflective electrode is greater than or equal to 1.6×150 nm and less than or equal to 1.8×225 nm.
4. The component according to claim 1 , wherein a distance between the light-emitting layer and the reflective electrode is greater than or equal to 180 nm and less than or equal to 225 nm.
5. The component according to claim 1 , wherein a distance between the light-emitting layer and the reflective electrode is chosen such that a relative proportion of radiation power generated in the light-emitting layer is coupled into the reflective electrode in the form of plasmons, the relative proportion being less than or equal to 10%.
6. The component according to claim 1 , wherein the electron-conducting layer or the hole-conducting layer, is the hole-conducting layer, which comprises a hole transport layer with a thickness of up to 350 nm.
7. The component according to claim 1 , wherein the translucent electrode has an absorption coefficient k of less than or equal to 0.005 for wavelengths of greater than 450 nm and a total transmission in a visible spectral range of greater than or equal to 80%.
8. The component according to claim 1 , wherein the reflective electrode has a reflectivity of greater than or equal to 80% in a visible spectral range.
9. The component according to claim 1 , wherein the optical coupling-out layer has a refractive index that is greater than or equal to a layer-thickness-weighted average refractive index of the organic functional layer stack and the translucent electrode.
10. The component according to claim 1 , wherein the optical coupling-out layer is light-scattering.
11. The component according to claim 1 , wherein the optical coupling-out layer comprises a material having a refractive index of greater than or equal to 1.8, in which scattering centers are arranged in a distributed fashion.
12. The component according to claim 1 , wherein the organic functional layer stack also comprises a further organic layer selected from:
a hole-blocking layer between the electron-conducting layer and the light-emitting layer; and
an electron-blocking layer between the hole-conducting layer and the light-emitting layer.
13. The component according to claim 1 , further comprising a plurality of light-emitting layers arranged between the hole-conducting layer and the electron-conducting layer.
14. The component according to claim 1 , wherein the translucent electrode has a resistivity of greater than or equal to 150 μΩ·cm and less than or equal to 500 μΩ·cm.
15. The component according to claim 1 , wherein the electron-conducting layer or the hole-conducting layer is a hole transport layer, which is a part of the hole-conducting layer and has a thickness of up to 350 nm.
16. An organic light-emitting component, comprising:
a translucent substrate;
an optical coupling-out layer overlying the translucent substrate;
a translucent electrode overlying the coupling-out layer;
an organic functional layer stack having organic functional layers, comprising:
an organic hole-conducting layer or an organic electron-conducting layer overlying the translucent electrode,
the organic light-emitting layer overlying the hole-conducting layer or overlying the organic electron-conducting layer, and
an organic electron-conducting layer or an organic hole-conducting layer; and
a reflective electrode,
wherein the organic light-emitting layer is at a distance of greater than or equal to 150 nm from the reflective electrode, and
wherein the translucent electrode has an absorption coefficient k of less than or equal to 0.005 for wavelengths of greater than 450 nm and a total transmission in a visible spectral range of greater than or equal to 80%.