Solution composition and polymer light-emitting device

Abstract

To provide a solution composition having a significantly high viscosity comprising one or more solvent(s) and one or more polymer(s) having a polystyrene-reduced Z-average molecular weight of 5.0×10 4 to 5.0×10 6 , and the solution composition allows to easily obtain a film having a favorable film formability and high uniformity.

1 . A solution composition comprising one or more solvent(s) and one or more conjugated aromatic polymer(s) having a polystyrene-reduced Z-average molecular weight of 1.0×10 5  to 5.0×10 6 , and having at least one repeating unit selected from the group consisting of formulas (1-1) and (1-2), and an amount of a repeating unit other than the formulas (1-1) and (1-2) is 30% by moles or less based on the sum of total repeating units: 
       
         
           
           
               
               
           
         
       
       wherein A ring, B ring, C ring, and D ring each independently represent an aromatic ring; and X represents —O—, —N(R)—, —Si(R) 2 , —Se—, B(R)—, —S—, —S(═O)—, —SO 2 —, —P(═O)(R)— or —P(R)—, wherein R represents an alkyl group, an alkoxy group, an alkylthio group, an alkylsilyl group, an alkyl amino group, a hydroxyl group, an amino group, a carboxyl group, an aldehyde group, a cyano group, an aryl group, an aryloxy group, an arylthio group, or an arylalkyl group. 
     
     
         2 . The solution composition according to  claim 1 , wherein the one or more conjugated aromatic polymer(s) has at least one repeating unit represented by formula (1-1). 
     
     
         3 . The solution composition according to  claim 1 , wherein X is —S— or —O—. 
     
     
         4 . The solution composition according to  claim 3 , wherein X is —S—. 
     
     
         5 . The solution composition according to  claim 1 , wherein the polymer has a polystyrene-reduced number-average molecular weight of 5.0×10 4  to 3.0×10 5 , polystyrene-reduced weight-average molecular weight of 1.0×10 5  to 1.0×10 6 , and polystyrene-reduced Z-average molecular weight of 3.0×10 5  to 3.0×10 6 . 
     
     
         6 . The solution composition according to  claim 1 , wherein the polymer content is 0.5 to 1.5% by weight when the total weight of the solution composition is defined as 100% by weight. 
     
     
         7 . The solution composition according to  claim 1 , comprising two or more kinds of solvents. 
     
     
         8 . A thin film produced with using the solution composition according to  claim 1 . 
     
     
         9 . A polymer light-emitting device having a light-emitting layer between electrodes comprising an anode and a cathode, wherein the light-emitting layer is formed with using the solution composition according to  claim 1 . 
     
     
         10 . The polymer light-emitting device according to  claim 9 , wherein the light-emitting layer is formed by inkjet method. 
     
     
         11 . A flat light source comprising the polymer light-emitting device according to  claim 9 . 
     
     
         12 . A segment display comprising the polymer light-emitting device according to  claim 9 . 
     
     
         13 . A dot-matrix display comprising the polymer light-emitting device according to  claim 9 . 
     
     
         14 . A liquid crystal display comprising the polymer light-emitting device according to  claim 9 , as a backlight.