Wavelength converting member and method of producing the same

Abstract

Provided is a wavelength converting member which can reduce change in the light emission intensity over time as compared with conventional members and a method of producing the wavelength converting member. A wavelength converting member ( 1 ) includes a quantum dot layer ( 2 ) having quantum dots, barrier layers ( 3, 4 ) formed on at least both sides of the quantum dot layer ( 2 ). The moisture vapor transmission rate of the barrier layer is lower than 9 g/(m 2 ·d). Thus, change in the light emission intensity over time can be effectively inhibited.

1 . A wavelength converting member comprising:
 a quantum dot layer having quantum dots; and   at least one organic layer formed on an outer side of the quantum dot layer,   wherein a moisture vapor transmission rate of the organic layer is lower than 9 g/(m 2 ·d).   
     
     
         2 . The wavelength converting member according to  claim 1 , wherein the moisture vapor transmission rate is 0.1 g/(m 2 ·d) or less. 
     
     
         3 . The wavelength converting member according to  claim 1 , wherein the organic layer is formed around the entire periphery of the quantum dot layer. 
     
     
         4 . The wavelength converting member according to  claim 3 , wherein a wrap starting end and a wrap finishing end of the organic layer are joined at an edge on one side of the quantum dot layer. 
     
     
         5 . The wavelength converting member according to  claim 3 , wherein the organic layers are placed on both the top and bottom of the quantum dot layer and are joined at edges on sides of the quantum dot layer. 
     
     
         6 . The wavelength converting member according to  claim 1 , wherein the quantum dot layer is formed from a molding or formed by inkjet printing. 
     
     
         7 . The wavelength converting member according to  claim 1 , wherein a layered structure, having a moisture vapor transmission rate that is less than 9 g/(m 2 ·d), is formed on the outer side of the quantum dot layer, and
 wherein, out of the layered structure, the organic layer is formed at the innermost layer facing the quantum dot layer. 
 
     
     
         8 . (canceled) 
     
     
         9 . The wavelength converting member according to  claim 7 , wherein in the layered structure, an inorganic layer is provided on, an outer side of the innermost layer. 
     
     
         10 . The wavelength converting member according to  claim 7 , wherein the layered structure comprises a plurality of the organic layers, and an inorganic layer is sandwiched between the organic layers. 
     
     
         11 . The wavelength converting member according to  claim 9 , wherein the inorganic layer is formed from a SiO 2  layer. 
     
     
         12 . The wavelength converting member according to  claim 7 , wherein the organic layer is formed in contact with the quantum dot layer. 
     
     
         13 . The wavelength converting member according to  claim 7 , wherein the organic layer is formed from a PET film. 
     
     
         14 . The wavelength converting member according to  claim 1 , wherein the quantum dot layer contains a thickening agent. 
     
     
         15 . The wavelength converting member according to  claim 1 , wherein the quantum dot layer contains a light-scattering agent. 
     
     
         16 . The wavelength converting member according to  claim 1 , wherein a surface of the organic layer is matted. 
     
     
         17 . A method of producing a wavelength converting member, comprising:
 forming an organic layer, having a moisture vapor transmission rate of less than 9 g/(m 2 ·d), on an outer side of a quantum dot layer having quantum dots.   
     
     
         18 . The method of producing a wavelength converting member, according to  claim 17 , wherein the entire periphery of the quantum dot layer is covered by the organic layer. 
     
     
         19 . The method of producing a wavelength converting member, according to  claim 18 , further comprising:
 forming a plurality of the quantum dot layers at intervals on a lower organic layer;   forming an upper organic layer over a surface of the lower organic layer and surfaces of the plurality of the quantum dot layers; and   isolating the quantum dot layers by cutting the lower organic layer and the upper organic layer between the quantum dot layers.   
     
     
         20 . The method of producing a wavelength converting member, according to  claim 17 , further comprising forming the quantum dot layer from a molding or forming by inkjet printing. 
     
     
         21 . The method of producing a wavelength converting member, according to  claim 17 , further comprising:
 forming a layered structure, having a moisture vapor transmission rate that is less than 9 g/(m 2 ·d), on the outer side of the quantum dot layer, and   forming, out of the layered structure, the organic layer at an innermost side facing the quantum dot layer.   
     
     
         22 . The method of producing a wavelength converting member, according to  claim 17 , further comprising:
 forming the layered structure to have a plurality of organic layers and an inorganic layer sandwiched between the organic layers,   wherein the innermost layer, of the layered structure, that faces the quantum dot layer and the outermost layer, of the layered structure, are constituted by the organic layers.   
     
     
         23 . The method of producing a wavelength converting member, according to  claim 17 , wherein the quantum dot layer includes a thickening agent.