Nano-encapsulating polymers with high barrier properties
Polymeric barriers for organic light emitting diodes are formed in-situ by encapsulation or polymerization. Encapsulation with melamine-cyanurate is performed using sublimation reaction technique. An encapsulation technique involves curing a layer of resin made by mixing a polyaza aryl compound, such as melamine, melam, or melem, with a cyanuryl triglycidyl ether. Another encapsulation technique involves curing a layer of resin made by mixing the polyaza aryl aromatic compound in 2,4,6-tricyanatophenyl glycidyl ether or tetracyanatobenzene applied to an organic light emitting diode. Photo catalytic curing of the coating may be achieved in the presence of catalysts such as titanium IV oxide acetylacetonate.
1. A polymer coated semiconductor comprising:
a semiconductor with at least one surface comprising a transparent conducting electrode, and a coating on the at least one surface, the coating comprising a polyaza aryl polymer comprising at least one polyaza aryl compound and at least one of triglycidyl ether cyanurate and 2,4,6-tricyanatophenyl glycidyl ether, wherein the coating has oxygen permeability of less than about 1 nmol of oxygen/square meter per day at 23° C., and moisture permeability of less than 1 nmol water/square meter per day at 23° C.
2. The polymer coated semiconductor of claim 1 , wherein the semiconductor is an organic light emitting diode.
3. The polymer coated semiconductor of claim 1 , wherein the polyaza aryl polymer comprises a network of:
at least one of melam, melem, and melamine; and
at least one of triglycidyl ether cyanurate, and 2,4,6-tricyanatophenyl glycidyl ether.
4. The polymer coated semiconductor of claim 1 , wherein the polyaza aryl polymer comprises melam-triglycidyl cyanurate, melem-triglycidyl cyanurate, or melamine-triglycidyl cyanurate, or any combination thereof.
5. The polymer coated semiconductor of claim 1 , wherein the polyaza aryl polymer comprises melam-2,4,6-tricyanatophenyl glycidyl ether, melem-2,4,6-tricyanatophenyl glycidyl ether, or melamine-2,4,6-tricyanatophenyl glycidyl ether, or any combination thereof.
6. The polymer coated semiconductor of claim 1 , wherein the coating has oxygen permeability of less than about 0.001 nmol of oxygen/square meter per day at 23° C., and moisture permeability of less than 0.001 nmol water/square meter per day at 23° C.
7. The polymer coated semiconductor of claim 1 , wherein the coating has a thickness of about 10 to about 150 microns.
8. The polymer coated semiconductor of claim 1 , wherein the at least one polyaza aryl compound comprises at least one of melam, melem, and melamine.
9. The polymer coated semiconductor of claim 1 , wherein the polyaza aryl polymer further comprises at least one of cyanuric acid and cyanurate.