Light extraction substrate for organic light emitting device, fabrication method therefor and organic light emitting device including same

Patent metadata

Field	Value
Publication number	US-2016164045-A1
Application number	US-201414903438-A
Country	US
Kind code	A1
Filing date	Jul 8, 2014
Priority date	Jul 8, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

The present invention relates to a light extraction substrate for an organic light emitting device, a fabrication method therefor and an organic light emitting device including the same and, more specifically, to a light extraction substrate for an organic light emitting device, a fabrication method therefor and an organic light emitting device including the same, wherein the light extraction substrate has aperiodic photonic crystal patterns formed on the front side thereof, through which light emitted from an organic light emitting element is emitted to the outside, thereby avoiding the dependency of light extraction on a specific wavelength band which occurs in existing periodic photonic crystal patterns, and inducing light extraction from a wider wavelength band. To this end, the present invention provides the light extraction substrate for the organic light emitting device, the fabrication method therefor and the organic light emitting device including the same, wherein the light extraction substrate, which is arranged on one surface through which the light emitted from the organic light emitting element is emitted to the outside, comprises: a base substrate; a matrix layer formed between the organic light emitting element and the base substrate; and the photonic crystal patterns formed on the base substrate, arranged inside the matrix layer and formed to have an aperiodic structure, wherein the matrix layer and the photonic crystal patterns form an internal light extraction layer of the organic light emitting device.

First claim

1 - 9 . (canceled)

10 . A method of fabricating a light extraction substrate for an organic light-emitting device, the method comprising:
forming a photonic crystal pattern having a non-periodic structure on a base substrate by bar coating while controlling a rolling speed of a rolling bar for the bar coating; and forming a matrix layer such that a surface of the matrix layer adjoining an organic light-emitting diode portion of an organic light-emitting device forms a flat surface and the photonic crystal pattern is positioned inside the matrix layer, wherein the light extraction substrate is disposed on one surface of the organic light-emitting diode portion through which light from the organic light-emitting diode portion is emitted.

11 . The method according to claim 10 , wherein forming the photonic crystal pattern comprises
forming a first photonic crystal pattern on the base substrate and forming a second photonic crystal pattern after rotating the base substrate such that the first and second photonic crystal patterns are arranged in different directions, whereby the photonic crystal pattern has a multilayer structure.

12 . The method according to claim 11 , wherein the base substrate is rotated at an angle ranging from 10° to 90°.

13 . The method according to claim 11 , wherein the first photonic crystal pattern, the second photonic crystal pattern and the matrix layer are formed from materials having different refractive indices, a refractive index of the first photonic crystal pattern being lowest among the different refractive indices, and a refractive index of the second photonic crystal pattern being highest among the different refractive indices.

14 . The method according to claim 10 , wherein the rolling bar has a coil which is non-periodically wound on an outer circumference thereof.

15 . The method according to claim 10 , wherein forming the photonic crystal pattern comprises mixing scattering particles into a material that is to form the photonic crystal pattern before the bar coating.

16 . (canceled)

17 . The method according to claim 14 , wherein the photonic crystal pattern has a non-periodic protrusion-depression pattern on an upper surface thereof.

18 . The method according to claim 10 , wherein the photonic crystal pattern is formed in a striped pattern on the base substrate.

19 . The method according to claim 17 , wherein the photonic crystal pattern comprises a plurality of bars which are arranged in one direction on the base substrate, wherein widths of the plurality of bars, distances between the plurality of bars and pitches of the plurality of bars are non-periodic.

20 . The method according to claim 18 , wherein thicknesses of the plurality of bars are equal or different.

Assignees

• Corning Prec Materials Co Ltd

Inventors

• Kwon Yoon Young
• Lee Joo Young
• Park Kyoung Wook
• Park Jeong Woo
• Choi Eun Ho

Classifications

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K77/10 Primary

  Substrates, e.g. flexible substrates · CPC title

• H01L51/56 Primary

  Electricity · mapped topic

• H01L51/5275

  Electricity · mapped topic

• H01L51/0096

  Electricity · mapped topic