Organic light emitting display with organic capping layer having a specific refractive index
An organic light emitting diode (OLED) display and a method for fabricating the same. The OLED display includes: a substrate; a first electrode formed on the substrate and including a reflecting layer; an organic layer formed on the first electrode and including at least an organic emission layer; a second electrode formed on the organic layer; and an organic capping layer formed on the second electrode. The organic capping layer is formed by stacking an organic material having a refractive index of 1.7 or more, thereby providing a high-efficiency and long-life top-emitting OLED display.
1. An organic light emitting diode (OLED) display comprising:
a substrate;
a first electrode formed on the substrate, the first electrode including a reflecting layer and a transparent layer;
an organic layer formed on the first electrode, the organic layer including a hole blocking layer, an electron injection layer, a hole injection layer, a hole transport layer, an electron transport layer, and an organic emission layer, wherein the transparent layer is between the organic layer and the reflecting layer;
a second electrode formed on the organic layer; and
an organic capping layer having a thickness of 600 Å formed on the second electrode, the organic capping layer having a refractive index of at least 1.7 and configured to transmit light from the organic layer.
2. The OLED display of claim 1 , wherein the organic capping layer has a refractive index of 1.7 to 2.4.
3. An organic light emitting diode (OLED) display comprising:
a substrate;
a first electrode formed on the substrate, the first electrode including a reflecting layer;
an organic layer formed on the first electrode, the organic layer including an organic emission layer;
a second electrode formed on the organic layer; and
an organic capping layer formed on the second electrode, the organic capping layer having a refractive index of at least 1.7,
wherein the organic capping layer is formed of an arylenediamine derivative and/or CBP.
4. The OLED display of claim 1 , wherein the organic capping layer is formed by a vacuum deposition method.
5. The OLED display of claim 1 , wherein the first electrode is an anode and the second electrode is a cathode.
6. The OLED display of claim 5 , wherein the transparent layer is a transparent electrode formed of Indium Tin Oxide or Indium Zinc Oxide.
7. The OLED display of claim 5 , wherein the reflecting layer is aluminum or an aluminum alloy.
8. The OLED display of claim 5 , wherein the second electrode is formed of Mg, Ag, Al, Ca and/or an alloy of Mg, Ag or Ca, the second electrode being a transmissive electrode having a small thickness.
9. A method for fabricating an organic light emitting diode (OLED) display, comprising:
preparing a substrate;
forming a first electrode including a reflecting layer and a transparent layer on the substrate;
forming an organic layer including a hole blocking layer, an electron injection layer, a hole injection layer, a hole transport layer, an electron transport layer, and an organic emission layer, over the first electrode, wherein the transparent layer is between the organic layer and the reflecting layer;
forming a second electrode on the organic layer; and
forming an organic capping layer having a refractive index of at least 1.7 and a thickness of 600 Å on the second electrode and configured to transmit light from the organic layer.
10. The method of claim 9 , wherein the organic capping layer has a refractive index of 1.7 to 2.4.
11. A method for fabricating an organic light emitting diode (OLED) display, comprising:
preparing a substrate;
forming a first electrode including a reflecting layer on the substrate;
forming an organic layer including an organic emission layer over the first electrode;
forming a second electrode on the organic layer; and
forming an organic capping layer having a refractive index of at least 1.7 on the second electrode,
wherein the organic capping layer comprises an arylenediamine derivative and/or CBP.
12. The method of claim 9 , wherein the organic capping layer is formed by a vacuum deposition method.
13. The method of claim 9 , wherein the first electrode is an anode and the second electrode is a cathode.
14. The method of claim 13 , wherein the transparent layer is a transparent electrode formed of Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO).
15. The method of claim 14 , wherein the reflecting layer comprises aluminum and/or an aluminum alloy.
16. The method of claim 13 , wherein the second electrode comprises Mg, Ag, Al, Ca and/or an alloy of Mg, Ag, Al or Ca, the second electrode being a transmissive electrode having a small thickness.
17. The OLED display of claim 3 , wherein the organic capping layer has a thickness of 600 Å.
18. The OLED display of claim 1 , wherein the organic capping layer is formed of a triamine derivative, an arylenediamine derivative, CBP, and/or Alq3.
19. The OLED display of claim 1 , wherein the second electrode comprises MgAg.
20. The method of claim 9 , wherein the second electrode comprises MgAg.
21. The OLED display of claim 1 , wherein the organic capping layer is formed of a metal-free organic compound.
22. The OLED display of claim 21 , wherein the organic capping layer has a refractive index of 1.7 to 2.4.
23. The method of claim 9 , wherein the organic capping layer is formed of a metal-free organic compound.
24. The method of claim 23 , wherein the organic capping layer has a refractive index of 1.7 to 2.4.