Filler material for organic electroluminescent element and method of sealing organic electroluminescent element

Patent metadata

Field	Value
Publication number	US-9793511-B2
Application number	US-201615190833-A
Country	US
Kind code	B2
Filing date	Jun 23, 2016
Priority date	Dec 27, 2013
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A filler material for an organic electroluminescent element, formed of a resin composition being liquid at 25° C., and containing a hydrocarbon polymer having a number average molecular weight of 300 or more and less than 32,000 and an organometallic compound represented by M-L n (wherein, M represents a metal atom; L represents an organic group having 9 or more carbon atoms and 1 or more oxygen atoms, and all of L represent the same organic group; and n represents the valence of a metal atom M), wherein a contact angle to silicon nitride is 10 to 40 degrees, and an amount of outgassing other than moisture upon heating at 85° C. for 1 hour is 500 ppm or less in terms of a toluene equivalent, and a method of sealing an organic electroluminescent element using the same.

First claim

The invention claimed is:

1. A filler material for an organic electroluminescent element, formed of a resin composition being liquid at 25° C., and containing a hydrocarbon polymer having a number average molecular weight of 300 or more and less than 32,000 and an organometallic compound represented by Formula 1;
wherein a contact angle to silicon nitride is 10 to 40 degrees, and an amount of outgassing other than moisture upon heating at 85° C. for 1 hour is 500 ppm or less in terms of a toluene equivalent;
M-L n   Formula (1)

wherein, in Formula (1), M represents a metal atom; L represents an organic group having 9 or more carbon atoms and 1 or more oxygen atoms, and all of L represent the same organic group; and n represents the valence of a metal atom M; and
wherein the organic group L is an organic group derived from aliphatic alcohol.

2. The filler material for the organic electroluminescent element according to claim 1 , wherein the metal atom M is a metal atom belonging to any one of group 2 to group 4 and group 11 to group 14 in the long periodic table of elements.

3. The filler material for the organic electroluminescent element according to claim 1 , wherein at least one kind of the hydrocarbon polymer is polyisobutylene.

4. The filler material for the organic electroluminescent element according to claim 1 , wherein at least one kind of the hydrocarbon polymer is a polymer of cyclic unsaturated hydrocarbon or a hydrogenated product thereof, having a number average molecular weight of 300 or more and less than 1,000.

5. The filler material for the organic electroluminescent element according to claim 1 , wherein total luminous transmittance in a wavelength region of 350 to 800 nm is 90% or more at a path length of 25 μm.

6. The filler material for the organic electroluminescent element according to claim 5 , wherein total luminous transmittance in a wavelength region of 350 to 800 nm after storage at 60° C. for 100 hours under an environment of 90% RH is 80% or more at a path length of 25 μm.

7. The filler material for the organic electroluminescent element according to claim 1 , wherein the resin composition contains inorganic particles having a mean particle diameter of 10 to 60 nm in 1 mass % or more and 20 mass % or less.

8. The filler material for the organic electroluminescent element according to claim 7 , wherein a fractal dimension of a contour line of a projected image per one particle of the inorganic particles is larger than 1.

9. The filler material for the organic electroluminescent element according to claim 1 , wherein the resin composition contains alkyl ester of a hydrogenated product of organic acid derived from a pine resin fraction.

10. A method of sealing an organic electroluminescent element, including at least a step of filling the filler material for the organic electroluminescent element according to claim 1 , into an airtight vessel in which a light-emitting part covered with an insulating protective layer is sealed.

11. A filler material for an organic electroluminescent element, formed of a resin composition being liquid at 25° C., and containing a hydrocarbon polymer having a number average molecular weight of 300 or more and less than 32,000 and an organometallic compound represented by Formula 1;
wherein a contact angle to silicon nitride is 10 to 40 degrees, and an amount of outgassing other than moisture upon heating at 85° C. for 1 hour is 500 ppm or less in terms of a toluene equivalent;
M-L n   Formula (1)

wherein, in Formula (1), M represents a metal atom; L represents an organic group having 9 or more carbon atoms and 1 or more oxygen atoms, and all of L represent the same organic group; and n represents the valence of a metal atom M; and
wherein the organic group L is an organic group derived from β-diketone, β-ketoester or malonic diester.

12. The filler material for the organic electroluminescent element according to claim 11 , wherein the metal atom M is a metal atom belonging to any one of group 2 to group 4 and group 11 to group 14 in the long periodic table of elements.

13. The filler material for the organic electroluminescent element according to claim 11 , wherein at least one kind of the hydrocarbon polymer is polyisobutylene.

14. The filler material for the organic electroluminescent element according to claim 11 , wherein at least one kind of the hydrocarbon polymer is a polymer of cyclic unsaturated hydrocarbon or a hydrogenated product thereof, having a number average molecular weight of 300 or more and less than 1,000.

15. The filler material for the organic electroluminescent element according to claim 11 , wherein total luminous transmittance in a wavelength region of 350 to 800 nm is 90% or more at a path length of 25 μm.

16. The filler material for the organic electroluminescent element according to claim 15 , wherein total luminous transmittance in a wavelength region of 350 to 800 nm after storage at 60° C. for 100 hours under an environment of 90% RH is 80% or more at a path length of 25 μm.

17. The filler material for the organic electroluminescent element according to claim 11 , wherein the resin composition contains inorganic particles having a mean particle diameter of 10 to 60 nm in 1 mass % or more and 20 mass % or less.

18. The filler material for the organic electroluminescent element according to claim 17 , wherein a fractal dimension of a contour line of a projected image per one particle of the inorganic particles is larger than 1.

19. The filler material for the organic electroluminescent element according to claim 11 , wherein the resin composition contains alkyl ester of a hydrogenated product of organic acid derived from a pine resin fraction.

20. A method of sealing an organic electroluminescent element, including at least a step of filling the filler material for the organic electroluminescent element according to claim 11 , into an airtight vessel in which a light-emitting part covered with an insulating protective layer is sealed.

Assignees

• Furukawa Electric Co Ltd

Inventors

• Mihara Naoaki
• Ishizaka Yasushi
• Mieda Tetsuya
• Ishiguro Kunihiko

Classifications

• H10K50/846

  comprising getter material or desiccants · CPC title

• C08L23/22

  Copolymers of isobutene; Butyl rubber; Homopolymers or copolymers of other iso-olefins · CPC title

• H01L51/5253 Primary

  Electricity · mapped topic

• H01L2251/5369

  Electricity · mapped topic

• H01L51/004

  Electricity · mapped topic