Protection of light emitting devices
View Patent ↗A light emitting device, includes a light emitting diode unit on a substrate; a gas-generating species; an inert gas; a barrier; and a sealant; wherein: the sealant, barrier, and substrate define a protective chamber; and the light emitting diode unit, the gas generating species, and the inert gas are disposed within the chamber.
1. A light emitting device, comprising:
a light emitting diode unit deposited on to a substrate, the light emitting diode unit comprising a cathode comprising 40 K or an alloy of 40 K;
a gas-generating species;
a barrier; and
a sealant;
wherein:
the sealant, barrier, and substrate define a protective chamber;
the light emitting diode unit, the gas generating species, and an inert gas are disposed within the protective chamber; and
the gas generating species comprises 40 K, a carbodiimide, an azo-compound, a cyanamide, a trizaole, an isocyanate or a combination of any two or more thereof.
2. The light emitting device of claim 1 , wherein a water-reactive material, an oxygen-reactive material, or both a water-reactive material and an oxygen-reactive material are disposed within the sealant or the protective chamber.
3. The light emitting device of claim 1 , wherein the inert gas comprises N 2 , Ar or a combination thereof.
4. The light emitting device of claim 1 , wherein a pressure within the protective chamber is from about 1 bar to about 1.2 bar.
5. The light emitting device of claim 1 , wherein the sealant comprises an epoxy polymer, an acrylic polymer, an acrylamide polymer, a polystyrene, a polyurethane, polyurea, polythiophene, polyphenylene, polyphenylene oxide, polyimides, polyamide, polyvinyl acetate, polyvinyl alcohol, polyethylene, polyolefin, polyesters, polyether, polytetrafluoroethylene, or a combination of any two or more thereof.
6. The light emitting device of claim 1 , wherein the gas-generating species is 40 K.
7. The light emitting device of claim 1 , wherein the inert gas comprises 40 Ar.
8. The light emitting device of claim 1 , wherein the gas generating species comprises dicyclohexyl carbodiimide, N,N′-diisopropyl carbodiimide, N-(2-methyliminomethylene-ethyl)acrylamide, a poly-N-(2-methyliminomethylene-ethyl)acrylamide or a combination of any two or more thereof.
9. The light emitting device of claim 1 , wherein the gas generating species is poly-N-(2-methyliminomethylene-ethyl)acrylamide.
10. The light emitting device of claim 1 , wherein the gas generating species is N-(1-H-(1,2,4)-triazol-3-yl)-acrylamide.
11. The light emitting device of claim 1 , wherein the sealant comprises N-(1-H-(1,2,4)-triazol-3-yl)-acrylamide.
12. The light emitting device of claim 1 , wherein the sealant comprises a polyacrylamide comprising a repeat unit represented by Formula I:
13. The light emitting device of claim 1 , wherein the gas generating species or the sealant comprises an isocyanate.
14. The light emitting device of claim 13 , wherein the isocyanate is 2-methyl-acrylic acid-2-isocyanato-ethyl ester.
15. The light emitting device of claim 14 , further comprising a polymerization product of 2-methyl-acrylic acid-2-isocyanato-ethyl ester, the polymerization product comprising repeating units according to Formula II:
16. A light emitting device, comprising:
a light emitting diode unit deposited on to a substrate;
a gas-generating species;
a barrier; and
a sealant;
wherein:
the sealant, barrier, and substrate define a protective chamber;
the light emitting diode unit, the gas generating species, and an inert gas are disposed within the protective chamber;
the gas generating species comprises 40 K, a carbodiimide, an azo-compound, a cyanamide, a trizaole, an isocyanate, or a combination of any two or more thereof; and
the sealant comprises a polyacrylamide comprising repeating units represented by Formula I or an isocyanate comprising repeating units represented by Formula II with proviso that only one of Formula I and Formula II is present as the sealant:
17. The light emitting device of claim 16 , wherein the light emitting diode unit is an organic light emitting diode unit.
18. The light emitting device of claim 16 , wherein a water-reactive material, an oxygen-reactive material, or both a water-reactive material and an oxygen-reactive material are disposed within the sealant or the protective chamber.
19. The light emitting device of claim 16 , wherein the inert gas comprises N 2 , Ar or a combination thereof.
20. The light emitting device of claim 16 , wherein a pressure within the protective chamber is from about 1 bar to about 1.2 bar.
21. The light emitting device of claim 16 , wherein the gas-generating species is 40 K.
22. The light emitting device of claim 16 , wherein the inert gas comprises 40 Ar.
23. The light emitting device of claim 16 , wherein the gas generating species comprises dicyclohexyl carbodiimide, N,N′-diisopropyl carbodiimide, N-(2-methyliminomethylene-ethyl)acrylamide, a poly-N-(2-methyliminomethylene-ethyl)acrylamide, or a combination of any two or more thereof.
24. The light emitting device of claim 16 , wherein the gas generating species is poly-N-(2-methyliminomethylene-ethyl)acrylamide.
25. The light emitting device of claim 16 , wherein the gas generating species is N-(1-H-(1,2,4)-triazol-3-yl)-acrylamide.
26. The light emitting device of claim 16 , wherein the gas generating species comprises an isocyanate.
27. The light emitting device of claim 26 , wherein the isocyanate is 2-methyl-acrylic acid-2-isocyanato-ethyl ester.
28. The light emitting device of claim 27 , further comprising a polymerization product of 2-methyl-acrylic acid-2-isocyanato-ethyl ester represented by Formula II:
29. The light emitting device of claim 16 , wherein the light emitting diode unit comprises a cathode comprising 40 K or an alloy of 40 K.