Optical filter and manufacturing method therefor, display substrate, and display apparatus

Abstract

An optical filter and manufacturing method therefor, a display substrate, and a display apparatus. The optical filter includes: a base substrate; an ordered porous film disposed on the base substrate, wherein the ordered porous film is formed with channels each of which having an extension direction at least at an angle to the base substrate and having an opening at a surface of the ordered porous film; and a plurality of quantum dots respectively disposed in at least part of the channels. The optical filter, the display substrate having the optical filter and the display apparatus can significantly improve the display colour gamut of the display apparatus.

1 . An optical filter comprising:
 a base substrate;   an ordered porous film disposed on the base substrate, wherein the ordered porous film is formed with channels each of which having an extension direction at least at an angle to the base substrate and having an opening at a surface of the ordered porous film; and   a plurality of quantum dots respectively disposed in at least part of the channels.   
     
     
         2 . The optical filter according to  claim 1 , wherein the ordered porous film comprises a porous anodic aluminum oxide film or a titanium dioxide nano-tube array film. 
     
     
         3 . The optical filter according to  claim 1 , wherein the angle between the extension direction of each of the channels and the base substrate is ranged from 60° to 90°. 
     
     
         4 . The optical filter according to  claim 3 , wherein the angle is ranged from 80° to 90°. 
     
     
         5 . The optical filter according to  claim 1 , wherein each of the at least part of the channels is provided with one quantum dot or a column of quantum dot. 
     
     
         6 . The optical filter according to  claim 1 , wherein a ratio of an average size of openings of the at least part of the channels to an average size of the quantum dots is greater than 1 and less than 2. 
     
     
         7 . The optical filter according to  claim 1 , wherein an average size of the openings of the at least part of the channels is ranged from 2 nm to 200 nm. 
     
     
         8 . The optical filter according to  claim 7 , wherein the average size of the openings of the at least part of the channels is ranged from 2 nm to 20 nm. 
     
     
         9 . The optical filter according to  claim 1 , wherein
 the ordered porous film is in direct contact with the base substrate; or   the optical filter further comprises a buffer layer disposed between the base substrate and the ordered porous film, and the buffer layer is in direct contact with the base substrate.   
     
     
         10 . The optical filter according to  claim 9 , wherein the buffer layer is a molybdenum metal layer and the base substrate is a glass substrate or a quartz substrate. 
     
     
         11 . The optical filter according to  claim 1 , further comprising a black matrix disposed on a side of the ordered porous film away from the base substrate,
 wherein the channels in the ordered porous film form a plurality of optical filter regions spaced apart from each other by the black matrix.   
     
     
         12 . The optical filter according to  claim 11 , wherein the quantum dots comprise a plurality of first quantum dots and a plurality of second quantum dots, and
 the second quantum dots and the first quantum dots are located in the different optical filter regions and excited to emit light of different colors.   
     
     
         13 . The optical filter according to  claim 12 , wherein the quantum dots further comprise a plurality of third quantum dots, and
 the third quantum dots, the first quantum dots, and the second quantum dots are located in the different optical filter regions and excited to emit light of different colors.   
     
     
         14 . The optical filter according  claim 1 , wherein the ordered porous film is transparent. 
     
     
         15 . A display substrate, comprising the optical filter according to  claim 1 . 
     
     
         16 . A display device, comprising the display substrate according to  claim 15 . 
     
     
         17 . A method of manufacturing an optical filter, comprising:
 forming an ordered porous film on a base substrate, wherein the ordered porous film is formed with channels each of which having an extension direction at least at an angle to the base substrate and having an opening at a surface of the ordered porous film; and   immersing the ordered porous film in a solution containing quantum dots to allow each of at least part of the channels to be filled with at least one quantum dot.   
     
     
         18 . The method according to  claim 17 , wherein
 a metal layer is deposited on the base substrate; and   the ordered porous film is formed from the metal layer.   
     
     
         19 . (canceled) 
     
     
         20 . (canceled) 
     
     
         21 . The method according to  claim 17 , wherein the channels comprise a plurality of first channels and a plurality of second channels, wherein
 after forming the ordered porous film, a first barrier layer is formed on the ordered porous film, the first barrier layer exposing the first channels and covering the second channels;   the ordered porous film with the first barrier layer is immersed in a solution containing first quantum dots to allow each of at least part of the first channels to be filled with at least one of the first quantum dots;   then a second barrier layer is formed on the ordered porous film, the second barrier layer exposing the second channels; and   the ordered porous film with the second barrier layer is immersed in a solution containing second quantum dots to allow each of at least part of the second channels to be filled with at least one of the second quantum dots, wherein the second quantum dots and the first quantum dots are excited to emit light of different colors.   
     
     
         22 . (canceled) 
     
     
         23 . (canceled) 
     
     
         24 . The method according to  claim 21 , wherein the channels further comprise a plurality of third channels, wherein
 after forming the ordered porous film and before immersing the ordered porous film in the solution containing first quantum dots, the first barrier layer formed on the ordered porous film exposes the first channels and covers the second channels and the third channels;   after each of at least part of the first channels is filled with at least one of the first quantum dots, the second barrier layer formed on the ordered porous film exposes the second channels and covers the third channels;   after each of at least part of the second channels is filled with at least one of the second quantum dots, a third barrier layer is formed on the ordered porous film and exposes the third channels; and   the ordered porous film with the third barrier layer is immersed in a solution containing third quantum dots to allow each of at least part of the third channels to be filled with at least one of the third quantum dots, wherein the third quantum dots, the first quantum dots and the second quantum dots are excited to emit color of different colors.   
     
     
         25 . (canceled) 
     
     
         26 . (canceled)