Light-extraction film for EL, method for manufacturing light-extraction film for EL, and planar light-emitting body

Patent metadata

Field	Value
Publication number	US-9891354-B2
Application number	US-201414896448-A
Country	US
Kind code	B2
Filing date	Jun 6, 2014
Priority date	Jun 12, 2013
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

This light-extraction film for EL includes a diffusion layer and an uneven-structure layer, the diffusion layer including first light-diffusion fine particles, and the uneven-structure layer including second light-diffusion fine particles as desired, and satisfying the expression Px−Py≧5 mass %. (Px represents the content ratio of the first light-diffusion fine particles to the total mass of the diffusion layer. Py represents the content ratio of the second light-diffusion fine particles to the total mass of the uneven structure layer.)

First claim

The invention claimed is:

1. A light extraction film for EL, comprising a diffusion layer and a recessed and projected structure layer, wherein
the diffusion layer includes first light-diffusion fine particles,
the recessed and projected structure layer includes substantially no second light-diffusion fine particles,
the following Expression (1) is satisfied,
Px−Py≧ 5% by mass  (1)

(Px represents a content ratio of the first light-diffusion fine particles to the total mass of the diffusion layer; and Py represents a content ratio of the second light-diffusion fine particles to the total mass of the recessed and projected structure layer),
the diffusion layer has a thickness of 40 μm or less, and
the first light-diffusion fine particles have a volume average particle diameter ranging from 1 μm to 10 μm.

2. The light extraction film for EL according to claim 1 , further comprising a base material, wherein
the diffusion layer and the recessed and projected structure layer are sequentially provided on the base material.

3. The light extraction film for EL according to claim 1 , wherein the content ratio Px of the first light-diffusion fine particles to the total mass of the diffusion layer is 10% by mass or more.

4. The light extraction film for EL according to claim 1 , wherein a thickness of the diffusion layer is 1 μm to 50 μm.

5. The light extraction film for EL according to claim 1 , wherein the content ratio Py of the second light-diffusion fine particles to the total mass of the recessed and projected structure layer is 20% by mass or less.

6. The light extraction film for EL according to claim 1 , wherein the diffusion layer has a thickness ranging from 1 μm to 40 μm.

7. The light extraction film for EL according to claim 1 , wherein the diffusion layer has a thickness ranging from 2 μm to 40 μm.

8. The light extraction film for EL according to claim 1 , wherein the first light-diffusion fine particles have an average particle diameter of 2 μm.

9. The light extraction film for EL according to claim 1 , wherein the diffusion layer includes a first resin, and the first light-diffusion fine particles included in the diffusion layer are evenly dispersed in the first resin.

10. The light extraction film for EL according to claim 9 , wherein a difference between a refractive index Rxm of the first resin and a refractive index Rxp of the first light-diffusion fine particles included in the diffusion layer is 0.05 to 0.30.

11. The light extraction film for EL according to claim 9 , wherein a difference between the refractive index Rxm of the first resin and the refractive index Rxp of the first light-diffusion fine particles included in the diffusion layer is 0.15 to 0.30.

12. The light extraction film for EL according to claim 9 , wherein the recessed and projected structure layer includes a second resin, and a refractive index Rym of the second resin is 1.40 to 1.80.

13. The light extraction film for EL according to claim 12 , wherein the refractive index Rym of the second resin is 1.55 to 1.80.

14. A surface light-emitting body comprising the light extraction film for EL according to claim 1 and an EL light-emitting element.

15. The surface light-emitting body according to claim 14 , wherein an amount of chromatic variation Δu′v′ of the surface light-emitting body is 0.01 or less.

16. A method for producing a light extraction film for EL, the method comprising:
supplying an active energy ray curable resin composition to a space between a diffusion sheet and a mold having a transferring portion of a recessed and projected structure; and
irradiating the active energy ray curable resin composition with an active energy ray,
wherein the diffusion sheet includes first light-diffusion fine particles and has a thickness of 40 μm or less, and
the first light-diffusion fine particles have a volume average particle diameter ranging from 1 μm to 10 μm.

17. The method for producing a light extraction film for EL according to claim 16 , wherein the first light-diffusion fine particles have an average particle diameter of 2 μm.

Assignees

• Mitsubishi Rayon Co
• Mitsubishi Chem Corp

Inventors

• Koshitouge Haruki

Classifications

• G02B3/0056

  arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses (G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085) · CPC title

• H01L51/5268

  Electricity · mapped topic

• H01L2251/558

  Electricity · mapped topic

• B29K2233/04

  Polymers of esters · CPC title

• H01L2251/5369

  Electricity · mapped topic