Organic electroluminescent device using optical resonance effect
View Patent ↗An organic electroluminescent device induces optical resonance with a simple structure, the organic electroluminescent device including: a transparent substrate; a semi-transparent layer formed on the transparent substrate; a first anode layer formed on the semi-transparent layer as a predetermined pattern; a cathode layer formed of a metallic total reflection layer on the first anode layer; and an organic layer formed between the first anode layer and the cathode layer, which includes at least an emitting layer, wherein an optical distance between a top surface of the semi-transparent layer and a bottom of the cathode layer is determined to be a least integer multiple of half the peak wavelengths of light of a predetermined set of colors. Due to a resonance effect of the organic electroluminescent device, the emission efficiency of wavelengths of light of different colors is improved, and high-purity quality pictures may be displayed on the organic electroluminescent device.
1. An organic electroluminescent device comprising:
a transparent substrate;
a semi-transparent layer formed on the transparent substrate;
a first anode layer formed on the semi-transparent layer as a predetermined pattern;
a cathode layer formed of a metallic total reflection layer on the first anode layer; and
an organic layer formed between the first anode layer and the cathode layer, which includes at least an emitting layer,
wherein an optical distance between a top surface of the semi-transparent layer and a bottom of the cathode layer is determined to be a least integer multiple of half the peak wavelengths of light of a predetermined set of colors.
2. The organic electroluminescent device of claim 1 , wherein the optical distance between the top surface of the semi-transparent layer and the bottom of the cathode layer is a sum of products of refractive indices and thicknesses of the respective first anode layer and the organic layer.
3. The organic electroluminescent device of claim 1 , further comprising a transparent spacer layer between the semi-transparent layer and the first anode layer.
4. The organic electroluminescent device of claim 3 , wherein the optical distance between the top surface of the semi-transparent layer and the bottom of the cathode layer is a sum of products of refractive indices and thicknesses of the respective transparent spacer layer, the first anode layer, and the organic layer.
5. The organic electroluminescent device of claim 1 , further comprising a second anode layer between the transparent substrate and the semi-transparent layer.
6. The organic electroluminescent device of claim 5 , wherein the optical distance between the top surface of the semi-transparent layer and the bottom of the cathode layer is a sum of products of refractive indices and thicknesses of the respective first anode layer and the organic layer.
7. The organic electroluminescent device of claim 1 , further comprising a metal oxide layer deposited on the top surface of the transparent substrate.
8. The organic electroluminescent device of claim 3 , further comprising a metal oxide layer deposited on the top surface of the transparent substrate.
9. The organic electroluminescent device of claim 5 , further comprising a metal oxide layer deposited on the top surface of the transparent substrate.
10. The organic electroluminescent device of claim 7 , wherein the metal oxide layer is one selected from the group consisting of a SiO 2 layer, a TiO 2 layer, a Y 2 O 3 layer, and a Nb 2 O 5 layer.
11. The organic electroluminescent device of claim 8 , wherein the metal oxide layer is one selected from the group consisting of a SiO 2 layer, a TiO 2 layer, a Y 2 O 3 layer, and a Nb 2 O 5 layer.
12. The organic electroluminescent device of claim 9 , wherein the metal oxide layer is one selected from the group consisting of a SiO 2 layer, a TiO 2 layer, a Y 2O 3 layer, and a Nb 2 O 5 layer.
13. The organic electroluminescent device of claim 1 , wherein the transparent substrate is a glass substrate.
14. The organic electroluminescent device of claim 1 , wherein the semi-transparent layer is a thin metal layer.
15. The organic electroluminescent device of claim 14 , wherein the thin metal layer is formed of one of silver and aluminum.
16. The organic electroluminescent device of claim 14 , wherein the thin metal layer is formed of one of a silver-copper-gold alloy and a silver-palladium-copper alloy.
17. The organic electroluminescent device of claim 1 , wherein the first anode layer and the organic layer are formed as a stripe pattern, and the cathode layer is formed as a stripe pattern perpendicular to the stripe pattern of the first anode layer and the organic layer.
18. The organic electroluminescent device of claim 1 , wherein the first anode layer is formed as a stripe pattern, and the organic layer and the cathode layer are formed as a stripe pattern perpendicular to the stripe pattern of the first anode layer.
19. The organic electroluminescent device of claim 1 , wherein the semi-transparent layer, the first anode layer, and the organic layer are formed as a stripe pattern, and the cathode layer is formed as a stripe pattern perpendicular to the stripe pattern of the semi-transparent layer, the first anode layer, and the organic layer.
20. The organic electroluminescent device of claim 1 , wherein the semi-transparent layer and the first anode layer are formed as a stripe pattern, and the organic layer and the cathode layer are formed as a stripe pattern perpendicular to the stripe pattern of the semi-transparent layer and the first anode layer.
21. The organic electroluminescent device of claim 3 , wherein the semi-transparent layer, the transparent spacer layer, the first anode layer, and the organic layer are formed as a stripe pattern, and the cathode layer is formed as a stripe pattern perpendicular to the stripe pattern of the semi-transparent layer, the transparent spacer layer, the first anode layer, and the organic layer.
22. The organic electroluminescent device of claim 3 , wherein the semi-transparent layer, the transparent spacer layer, and the first anode layer are formed as a stripe pattern, and the organic layer and the cathode layer are formed as a stripe pattern perpendicular to the stripe pattern of the semi-transparent layer, the transparent spacer layer, and the first anode layer.
23. The organic electroluminescent device of claim 5 , wherein the second anode layer, the semi-transparent layer, the first anode layer, and the organic layer are formed as a stripe pattern, and the cathode layer is formed as a stripe pattern perpendicular to the stripe pattern of the second anode layer, the semi-transparent layer, the first anode layer, and the organic layer.
24. The organic electroluminescent device of claim 5 , wherein the second anode layer, the semi-transparent layer, and the first anode layer are formed as a stripe pattern, and the organic layer and the cathode layer are formed as a stripe pattern perpendicular to the stripe pattern of the second anode layer, the semi-transparent layer, and the first anode layer.