Light emitting element, display device, and electronic apparatus

Patent metadata

Field	Value
Publication number	US-10777774-B2
Application number	US-201816497128-A
Country	US
Kind code	B2
Filing date	Feb 13, 2018
Priority date	Mar 31, 2017
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

A light emitting element and corresponding display device with improved light extracting efficiency are disclosed. In one example, a light emitting element includes a first electrode with a first member disposed on both sides to form a recess structure with the first electrode as a bottom. An organic light emitting layer is disposed along the recess structure on the first electrode and the first member, and a second electrode is disposed on the organic light emitting layer. A second member having a higher refractive index than the first member is disposed on the second electrode so as to embed the recess structure. Between the second electrode and the second member, a laminate barrier layer is formed of layers having different refractive indices and having, as the entire laminate, a refractive index between the refractive index of the second electrode and the refractive index of the second member.

First claim

The invention claimed is:

1. A light emitting element comprising:
a first electrode;
a first member disposed on both sides of the first electrode and forming a recess structure having the first electrode as a bottom;
an organic light emitting layer including an organic light emitting material and disposed along the recess structure on the first electrode and the first member;
a second electrode disposed on the organic light emitting layer; and
a second member having a higher refractive index than the first member and disposed on the second electrode so as to embed the recess structure, wherein
between the second electrode and the second member, a barrier layer formed as a laminate of a plurality of layers having different refractive indices and having, as the entire laminate, a refractive index between the refractive index of the second electrode and the refractive index of the second member is disposed.

2. The light emitting element according to claim 1 , wherein the laminate is obtained by laminating two types of layers repeatedly and alternately.

3. The light emitting element according to claim 2 , wherein at least one of the two types of layers has a film thickness of 10 nm or less.

4. The light emitting element according to claim 2 , wherein a total film thickness of a repeating unit including the two types of layers is 24 nm or less.

5. The light emitting element according to claim 2 , wherein a difference in refractive index between the two types of layers is 0.1 or more.

6. The light emitting element according to claim 1 , wherein the laminate is obtained by laminating three or more types of layers.

7. The light emitting element according to claim 1 , wherein the laminate is formed by laminating a plurality of types of inorganic materials containing different types of elements.

8. The light emitting element according to claim 7 , wherein at least one of the inorganic materials is a metal oxide.

9. The light emitting element according to claim 8 , wherein the metal oxide is any one of TiO 2 , ZrO 2 , ZnO, Ta 2 O 5 , HfO 2 , and Nb 2 O 5 .

10. A display device comprising:
a display unit having a plurality of light emitting elements arranged on a plane, each of the light emitting elements including: a first electrode; a first member disposed on both sides of the first electrode and forming a recess structure having the first electrode as a bottom; an organic light emitting layer including an organic light emitting material and disposed along the recess structure on the first electrode and the first member; a second electrode disposed on the organic light emitting layer; and a second member having a higher refractive index than the first member and disposed on the second electrode so as to embed the recess structure, in which between the second electrode and the second member, a barrier layer formed as a laminate of a plurality of layers having different refractive indices and having, as the entire laminate, a refractive index between the refractive index of the second electrode and the refractive index of the second member is disposed; and
a display control unit that controls the display unit.

11. An electronic apparatus comprising:
a display unit having a plurality of light emitting elements arranged on a plane, each of the light emitting elements including: a first electrode; a first member disposed on both sides of the first electrode and forming a recess structure having the first electrode as a bottom; an organic light emitting layer including an organic light emitting material and disposed along the recess structure on the first electrode and the first member; a second electrode disposed on the organic light emitting layer; and a second member having a higher refractive index than the first member and disposed on the second electrode so as to embed the recess structure, in which between the second electrode and the second member, a barrier layer formed as a laminate of a plurality of layers having different refractive indices and having, as the entire laminate, a refractive index between the refractive index of the second electrode and the refractive index of the second member is disposed; and
a control unit that controls the display unit.

Assignees

• Sony Semiconductor Solutions Corp

Inventors

• Ishii Yoshiyuki

Classifications

• H10K59/879

  comprising refractive means, e.g. lenses · CPC title

• H10K59/8731

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K50/858

  comprising refractive means, e.g. lenses · CPC title

• H10K59/122 Primary

  Pixel-defining structures or layers, e.g. banks · CPC title

• G09F9/30

  in which the desired character or characters are formed by combining individual elements (panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00) · CPC title