Semiconducting light emitting material

Abstract

Suggested is a semiconductor nano-sized light emitting material having a ligand.

1 - 16 . (canceled) 
     
     
         17 . A compound of formula (I) 
       
         
           
           
               
               
           
         
         in which 
         M stands for a bivalent metal, 
         X stands for —O— or —S— or —NR 2 —; 
         Y 1  stands for —O— or —S—; 
         R 1 , R 2  stand independently from each other for an alkyl, alkenyl, alkenyl, aryl and/or aralkyl chain having 12-18 carbon atoms, optionally substituted by a functional group; or a group according to formula (II) and/or (III)
   —(CHR 5 ) x (O(CHR 5 ) y2 —NR 3 R 4   (II)
 
   —CH 2 CHR 5 O) z R 6   (III)
 
 
         R 3 , R 4  stand independently from each other linear or branched alkyl chains having 1 to 6 carbon atoms; 
         R 5  stands for hydrogen or methyl; 
         R 6  stands for an alkyl chain having 1 to 4 carbon atoms, optionally substituted by a functional group; 
         x, y2 stand independently from each other for integers of from 1 to 5; and 
         z stands for an integer of from 1 to 30. 
       
     
     
         18 . The compound of  claim 17  having the structure 
       
         
           
           
               
               
           
         
         wherein M is a bivalent metal, 
         R1 and R2 are each independently an alkyl, alkenyl, aryl and/or aralkyl chain having 13-18 carbon atoms. 
       
     
     
         19 . The compound of  claim 17 , which is (C18)Xanthate when the compound is a xanthate and is (C18)dialkyl thiocarbamate when the compound is a thiocarbamate. 
     
     
         20 . The compound of  claim 17 , wherein M is zinc, magnesium, copper, or a mixture thereof. 
     
     
         21 . The compound of  claim 18 , wherein M is zinc, magnesium, copper, or a mixture thereof. 
     
     
         22 . A method of forming a quantum dot, comprising
 i) coating a quantum dot after ligand purification by bringing it into contact with a source of the compound of  claim 17 , and optionally   ii) subjecting said coated quantum dot to illumination with light with a peak light wavelength of about 300 to about 650 nm to increase QY of resulting nano-sized material.