Tandem OLED device with intermediate connector
View Patent ↗A tandem OLED device including an anode; a cathode; at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-transporting layer and one organic light-emitting layer; and an intermediate connector of at least two layers disposed between adjacent electroluminescent units, wherein the intermediate connector includes an organic alkali metal complex layer and an organic electron-accepting layer, the organic electron-accepting layer being disposed closer to the cathode than the organic alkali metal complex layer, and there is present metallic aluminum in the organic alkali metal complex layer.
1. A tandem OLED device comprising:
(a) an anode;
(b) a cathode;
(c) at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-transporting layer and one organic light-emitting layer; and
(d) an intermediate connector of at least two layers disposed between adjacent electroluminescent units, wherein the intermediate connector includes an organic alkali metal complex layer and an organic electron-accepting layer, the organic electron-accepting layer being disposed closer to the cathode than the organic alkali metal complex layer, and there is present metallic aluminum in the range of from 0.2 to 5% in the organic alkali metal complex layer.
2. The tandem OLED device of claim 1 wherein the metallic aluminum is present in the range of from 0.5 to 2%.
3. The tandem OLED device of claim 1 wherein the organic alkali metal complex layer includes an organic alkali metal complex and an aromatic hydrocarbon compound.
4. The tandem OLED device of claim 3 wherein the organic alkali metal complex is a salt of hydroxyquinoline.
5. The tandem OLED device of claim 3 wherein the hydrocarbon compound is a rubrene derivative.
6. The tandem OLED of claim 1 wherein the organic electron-accepting layer includes a hexaazatriphenylene derivative.
7. A tandem OLED device comprising:
(a) an anode;
(b) a cathode;
(c) at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-transporting layer and one organic light-emitting layer; and
(d) an intermediate connector of at least two layers disposed between adjacent electroluminescent units, wherein the intermediate connector includes an organic alkali metal complex layer and an organic electron-accepting layer, the organic electron-accepting layer being disposed closer to the cathode than the organic alkali metal complex layer, and there is present metallic aluminum in a layer of from 0.1 to 2 nm thickness between the organic alkali metal complex layer and the organic electron-accepting layer.
8. The tandem OLED device of claim 7 wherein the metallic aluminum forms a layer of from 0.2 to 2 nm thickness.
9. The tandem OLED device of claim 7 wherein the organic alkali metal complex layer includes an organic alkali metal complex and an aromatic hydrocarbon compound.
10. The tandem OLED device of claim 9 wherein the organic alkali metal complex is a salt of hydroxyquinoline.
11. The tandem OLED device of claim 9 wherein the hydrocarbon compound is a rubrene derivative.
12. The tandem OLED of claim 7 wherein the organic electron-accepting layer includes a hexaazatriphenylene derivative.
13. The tandem OLED of claim 7 wherein there is further present metallic aluminum in the range of from 0.2 to 5% in the organic alkali metal complex layer.