Organic electroluminescent device including transparent conductive layer and fabricating method thereof
View Patent ↗A method of fabricating an electrode for an organic electroluminescent device includes forming a transparent conductive layer on a substrate, doping the transparent conductive layer with impurities, and annealing the doped transparent conductive layer.
1. An organic electroluminescent device, comprising:
a substrate;
a first electrode of a transparent conductive material including impurities on the substrate;
a plurality of organic electroluminescent layers, the plurality of organic electroluminescent layers includes a first organic electroluminescent layer and a second organic electroluminescent layer, and the first organic electroluminescent layer is coupled to the first electrode; and
a second electrode coupled to the second organic electroluminescent layer.
2. The device according to claim 1 , wherein the first organic electroluminescent layer includes a hole injection layer.
3. The device according to claim 2 , wherein the first electrode includes at least one of indium-tin-oxide and indium-zinc-oxide.
4. The device according to claim 3 , wherein the hole injection layer has a work function between about 5.2 eV and about 5.3 eV, and the first electrode has a work function greater than about 4.84 eV.
5. The device according to claim 3 , wherein the first electrode is formed by doping a transparent conductive layer with impurities between about 5×10 14 ions/cm 2 and about 3×10 15 ions/cm 2 at an acceleration voltage of about 30 kV.
6. The device according to claim 5 , wherein the impurities are positive type (p-type) impurities.
7. The device according to claim 6 , wherein the impurities are compounds including boron impurities.
8. The device according to claim 5 , wherein the impurities are negative type (n-type) impurities.
9. The device according to claim 8 , wherein the impurities are compounds including phosphorous impurities.
10. The device according to claim 3 , wherein the first electrode is formed by annealing a doped transparent conductive layer at a temperature between about 230° C. and about 400° C. for a time period between about 30 minutes to about 2 hours.
11. The device according to claim 3 , wherein the first electrode is formed by annealing a doped transparent conductive layer at a temperature of about 400° C. for about 30 minutes.