Polarized light emissive device

Patent metadata

Field	Value
Publication number	US-10126475-B2
Application number	US-201515129213-A
Country	US
Kind code	B2
Filing date	Mar 6, 2015
Priority date	Mar 26, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

The present invention relates to a polarized light emissive device comprising a plural of fluorescent semiconductor quantum rods, and to a preparation thereof. The invention further relates to a use of the polarized light emissive device in optical devices, and to an optical device comprising the polarized light emissive device.

First claim

The invention claimed is:

1. A polarized light emissive device ( 100 ), comprising a light reflection layer and a substrate ( 110 ) including a plural of grooves ( 120 ); and a plural of inorganic fluorescent semiconductor quantum rods ( 130 ) aligned on the surface of the plural of grooves of the substrate, in which the plural of inorganic fluorescent semiconductor quantum rods is not a self-assembled colloidal superparticle, wherein the axial pitch of the plural of grooves is from 50 nm to 1 μm and the height is from 20 nm to 500 nm.

2. The polarized light emissive device ( 100 ) according to claim 1 , wherein the substrate ( 110 ) and the plural of grooves ( 120 ) are transparent.

3. The polarized light emissive device ( 100 ) according to claim 1 , wherein the plural of grooves ( 120 ) is a plural of parallel microgrooves.

4. The polarized light emissive device ( 100 ) according to claim 1 , wherein the plural of grooves ( 120 ) is placed on the surface of the substrate ( 110 ) periodically.

5. The polarized light emissive device ( 100 ) according to claim 1 , wherein the plural of inorganic fluorescent semiconductor quantum rods ( 130 ) is selected from the group consisting of II-VI, III-V, or IV-VI semiconductors and combinations of any of these.

6. The polarized light emissive device ( 100 ) according to claim 1 , wherein the plural of inorganic fluorescent semiconductor quantum rods comprises a surface ligand.

7. The polarized light emissive device ( 100 ) according to claim 1 , wherein the polarized light emissive device ( 100 ) further comprising a transparent passivation layer.

8. An optical device, comprising the polarized light emissive device ( 100 ) according to claim 1 .

9. An optical device, wherein the optical device includes a polarized light emissive device ( 100 ), comprising a light reflection layer and a substrate ( 110 ) including a plural of grooves ( 120 ); and a plural of inorganic fluorescent semiconductor quantum rods ( 130 ) aligned on the surface of the plural of grooves of the substrate ( 110 ), in which the plural of inorganic fluorescent semiconductor quantum rods ( 130 ) is not a self-assembled colloidal superparticle, wherein the axial pitch of the plural of grooves is from 50 nm to 1 μm and the height is from 20 nm to 500 nm.

10. A method for preparing the polarized light emissive device ( 100 ) according to claim 1 , comprising the following sequential steps of:
(a) dispersing a plural of inorganic fluorescent semiconductor quantum rods into a solvent;
(b) providing the resulting solution from step (a) onto a plural of grooves; and
(c) evaporating the solvent in the coated solution to provide the polarized light emissive device ( 100 ).

11. The method for preparing the polarized light emissive device ( 100 ) according to claim 10 , wherein the method further comprises the step (d) after the step (b) and before the step(c)
(d) smoothing the resulting solution provided onto the plural of grooves.

12. The method for preparing the polarized light emissive device ( 100 ) according to claim 10 , wherein the solvent is water or an organic solvent.

13. The polarized light emissive device ( 100 ) according to claim 1 , wherein the light reflection layer is present on the plural of grooves, in between the substrate and the plural of grooves or in the substrate.

14. The polarized light emissive device ( 100 ) according to claim 1 , wherein the light reflection layer is a single layer.

15. The polarized light emissive device ( 100 ) according to claim 1 , wherein the light reflection layer contains multiple layers.

16. The polarized light emissive device ( 100 ) according to claim 1 , wherein the light reflection layer is selected from the group consisting of an Al layer, Al+MgF 2 stacked layers, Al+SiO stacked layers, Al+dielectric multiple layer, an Au layer, a dielectric multiple layer, and Cr+Au stacked layers.

17. The polarized light emissive device ( 100 ) according to claim 1 , wherein the axial pitch is from 260 nm to 420 nm and the height is from 50 nm to 100 nm.

18. An optical device according to claim 9 , wherein the axial pitch is from 260 nm to 420 nm and the height is from 50 nm to 100 nm.

19. An optical device according to claim 9 , which is a liquid crystal display, a quantum rod display, a color filter, a polarized backlight unit, a microscope, a metallurgy inspection device or an optical communications device.

20. The polarized light emissive device ( 100 ) according to claim 1 , which is a polarized LCD backlight unit.

Assignees

• Merck Patent Gmbh

Inventors

• Hasegawa Masaki

Classifications

• G02B5/3025 Primary

  Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence) · CPC title

• Y10S977/892

  Liquid phase deposition · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• H05B33/20

  characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded · CPC title

• C09K11/025

  non-luminescent particle coatings or suspension media · CPC title