Black organic light-emitting diode device

1. A black organic light-emitting diode device, comprising:

a glass substrate;

a first metal layer formed on the glass substrate;

a first electrode formed on the first metal layer;

an organic light-emitting layer formed on the first electrode;

a second electrode formed on the organic light-emitting layer so as to face the first electrode;

a first interlayer formed on the second electrode;

a second metal layer formed on the first interlayer; and

a second interlayer formed on the second metal layer,

wherein thicknesses of the first interlayer and the second interlayer are adjusted so that external light reflected from the first metal layer and the second electrode destructively interferes with light reflected from the second metal layer.

2. The black organic light-emitting diode device of claim 1 , wherein a part of the external light reflected from the first metal layer and the second electrode, which does not destructively interfere with light reflected from the second metal layer, is absorbed by the second metal layer.

3. The black organic light-emitting diode device of claim 2 , wherein the first metal layer improves electrical resistance of the first electrode, and a material of the first metal layer is any one selected from the group consisting of Ag, Al, Mg, Cr, Ti, Ni, W, Au, Ta, Cu, Co, Fe, Mo and Pt, or alloys thereof.

4. The black organic light-emitting diode device of claim 2 , wherein the second metal layer is provided in a form of a thin metal layer, and a material of the second metal layer is any one selected from the group consisting of Cr, Ti, Mo, Co, Ni, W, Al, Ag, Au, Cu, Fe, Mg and Pt, or alloys thereof.

5. The black organic light-emitting diode device of claim 2 , wherein the first electrode is a transparent anode and comprises a transparent conductive oxide (ITO or IZO) or a semi-transmissive metal.

6. The black organic light-emitting diode device of claim 2 , wherein the second electrode is a semi-transparent metal layer and forms a cathode, and a material of the second electrode is any one selected from the group consisting of Ag, Al, Mg, Cr, Ti, Ni, W, Au, Ta, Cu, Co, Fe, Mo and Pt, or alloys thereof.

7. The black organic light-emitting diode device of claim 2 , wherein the first interlayer is a dielectric layer which enables a relative phase between light reflected from the second electrode and light reflected from the second metal layer to be adjusted to 120˜240°, and a material of the first interlayer is any one selected from the group consisting of SiOx (x≧1), SiNx (x≧1), MgF 2 , CaF 2 , Al 2 O 3 , SnO 2 , ITO, IZO, ZnO, Ta 2 O 5 , Nb 2 O 5 , HfO 2 , TiO 2 and In 2 O 3 .

8. The black organic light-emitting diode device of claim 7 , wherein the first interlayer is a dielectric layer which enables the relative phase between light reflected from the second electrode and light reflected from the second metal layer to be adjusted to 150˜210°.

9. The black organic light-emitting diode device of claim 8 , wherein the first interlayer is a dielectric layer which enables the relative phase between light reflected from the second electrode and light reflected from the second metal layer to be adjusted to 180°.

10. The black organic light-emitting diode device of claim 2 , wherein the second interlayer is a dielectric layer which compensates for a case where the relative phase adjusted by the first interlayer falls outside 180°, and a material of the second interlayer is any one selected from the group consisting of SiOx (x≧1), SiNx (x≧1), MgF 2 , CaF 2 , Al 2 O 3 , SnO 2 , ITO, IZO, ZnO, Ta 2 O 5 , Nb 2 O 5 , HfO 2 , TiO 2 and In 2 O 3 .