Method and apparatus for directional organic light emitting diodes
The directionality of organic light emitting diodes is improved by the introduction of a patterned metal electrode as either the anode or the cathode.
1 . An organic light emitting diode comprising:
a plurality of organic layers; and
a first and second highly conducting metal electrode sandwiching said plurality of organic layers, said second highly conducting electrode comprising a suitably patterned surface comprising a lattice of holes penetrating through said second highly conducting electrode such that said organic light emitting diode is operable to emit light in a highly directional radiation pattern.
2 . The apparatus of claim 1 wherein said lattice of holes is a triangular lattice of holes.
3 . The apparatus of claim 1 wherein said lattice of holes is a square lattice of holes.
4 . The apparatus of claim 1 wherein holes of said lattice of holes have a square cross-section.
5 . The apparatus of claim 1 wherein holes of said lattice of holes have a circular cross-section.
6 . The apparatus of claim 1 wherein holes of said lattice of holes are filled with a material chosen from SiO 2 , SiN x and air.
7 . The apparatus of claim 1 wherein said second highly conducting electrode is a cathode electrode.
8 . The apparatus of claim 1 wherein one of said plurality of organic layers is an emissive layer.
9 . The apparatus of claim 1 wherein on of said plurality of organic layers is comprised of diamines.
10 . The apparatus of claim 1 wherein said plurality of organic layers are polymeric based.
11 . A method for an organic light emitting diode comprising:
providing a plurality of organic layers; and
providing a first and second highly conducting metal electrode sandwiching said plurality of organic layers, said second highly conducting electrode comprising a suitably patterned surface comprising a lattice of holes penetrating through said second highly conducting electrode such that said organic light emitting diode is operable to emit light in a highly directional radiation pattern.
12 . The method of claim 11 wherein said lattice of holes is a triangular lattice of holes.
13 . The method of claim 11 wherein said lattice of holes is a square lattice of holes.
14 . The method of claim 11 wherein holes of said lattice of holes have a square cross-section.
15 . The method of claim 11 wherein holes of said lattice of holes have a circular cross-section.
16 . The method of claim 11 wherein holes of said lattice of holes are filled with a material chosen from SiO 2 , SiN x and air.
17 . The method of claim 11 wherein said second highly conducting electrode is a cathode electrode.
18 . The method of claim 11 wherein one of said plurality of organic layers is an emissive layer.
19 . The method of claim 11 wherein one of said plurality of organic layers is comprised of diamines.
20 . The method of claim 11 wherein said plurality of organic layers are polymeric based.