ORGANIC EL DEVICE - NITTO DENKO CORP

Title:

ORGANIC EL DEVICE

Document Type and Number:

WIPO Patent Application WO/2012/039319

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide: an organic EL device which has improved light extraction efficiency and improved viewing angle dependence of luminance and color change; and a lighting device which uses the organic EL device. This organic EL device comprises an organic EL element and a light diffusion element that is arranged on the light emitting surface side of the organic EL element. The light diffusion element comprises: a matrix that contains a resin component and an ultrafine particle component; and light diffusing fine particles that are dispersed in the matrix. The resin component, the ultrafine particle component and the light diffusing fine particles have refractive indexes satisfying formula (1). The light diffusion element has concentration modulated regions, which are formed outside the light diffusing fine particles in the vicinity of the surfaces thereof, and wherein the weight concentration of the resin component becomes lower and the weight concentration of the ultrafine particle component becomes higher with distance from the light diffusing fine particles. |nP - nA| < |nP - nB| (1) In formula (1), nA represents the refractive index of the resin component of the matrix; nB represents the refractive index of the ultrafine particle component of the matrix; and nP represents the refractive index of the light diffusing fine particles.

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Inventors:

NAGASE JUNICHI (JP)
NISHIMURA AKINORI (JP)
TAKEMOTO HIROYUKI (JP)

Application Number:

PCT/JP2011/070818

Publication Date:

March 29, 2012

Filing Date:

September 13, 2011

Export Citation:

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Assignee:

NITTO DENKO CORP (JP)
NAGASE JUNICHI (JP)
NISHIMURA AKINORI (JP)
TAKEMOTO HIROYUKI (JP)

International Classes:

H05B33/02; H01L51/50

Foreign References:

JP2005215461A	2005-08-11
JP2009187804A	2009-08-20
JP2009259802A	2009-11-05
JP2010049210A	2010-03-04
JP2010205650A	2010-09-16

Attorney, Agent or Firm:

MOMII, Takafumi (JP)
Takafumi Momii (JP)

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Claims:

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