Light emitting device including semiconductor nanocrystals

Abstract

A light emitting device includes a semiconductor nanocrystal in a layer. The layer can be a non-polymeric layer.

1 - 86 . (canceled) 
     
     
         87 . A composition comprising a nanocrystal and a coordinating ligand, wherein the coordinating ligand has the formula 
       
         
           
           
               
               
           
         
         wherein k is 2, 3 or 5, and n is 1, 2, 3, 4 or 5, such that k-n is not less than zero; and each of Y and L, independently, is aryl, heteroaryl, or a straight or branched C 2-12  hydrocarbon chain optionally containing at least one double bond, at least one triple bond, or at least one double bond and one triple bond, the hydrocarbon chain being optionally substituted with one or more C 1-4  alkyl, C 2-4  alkenyl, C 2-4  alkynyl, C 1-4  alkoxy, hydroxyl, halo, amine, nitro, cyano, C 3-5  cycloalkyl, 3-5 membered heterocycloalkyl, aryl, heteroaryl, C 1-4  alkylcarbonyloxy, C 1-4  alkyloxycarbonyl, C 1-4  alkylcarbonyl, or formyl; and the hydrocarbon chain being optionally interrupted by —O—, —S—, —N(R a )—, —N(R b )—C(O)—O—, —O—C(O)—N(R a )—, —N(R a )—C(O)—N(R b )—, —O—C(O)—O—, —P(R a )—, or —P(O)(R a )—, wherein each of R a  and R b , independently, is hydrogen, alkyl, alkenyl, alkynyl, alkoxy, hydroxylalkyl, hydroxyl, or haloalkyl. 
       
     
     
         88 . The composition of  claim 87 , wherein X is O, S, S═O, SO 2 , Se, Se═O, N, N═O, P, P═O, As, or As═O. 
     
     
         89 . The composition of  claim 87 , wherein the nanocrystals comprise at least one semiconductor material selected from the group consisting of Zns, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, HgTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, GaSe, InN, InP, InAs, InSb, TlN, TlP, TlAs, TlSb, PbS, PbSe, and PbTe. 
     
     
         90 . The composition of  claim 89 , wherein the nanocrystals further comprise an overcoating, the overcoating comprising at least one semiconductor material selected from the group consisting of ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, HgTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, GaSe, InN, InP, InAs, InSb, TlN, TlP, TlAs, TlSb, PbS, PbSe, and PbTe. 
     
     
         91 . The composition of  claim 87 , wherein the nanocrystal comprises a CdSe core and a ZnS shell. 
     
     
         92 . The composition of  claim 87 , wherein at least a portion of the coordinating ligand has an affinity for the surface of the nanocrystal. 
     
     
         93 . The composition of  claim 87 , wherein at least a portion of the coordinating ligand has an affinity for a dispersion medium. 
     
     
         94 . The composition of  claim 87 , wherein each of Y or L, independently, comprises a straight or branched C 2-12  hydrocarbon chain substituted with one or more amines. 
     
     
         95 . The composition of  claim 87 , wherein each of Y or L, independently, comprises a straight or branched C 2-12  hydrocarbon chain substituted with multiple amines. 
     
     
         96 . The composition of  claim 95 , wherein the one or more amine is attached to the surface of the nanocrystal. 
     
     
         97 . The composition of  claim 87 , wherein each of Y or L, independently, comprises a straight or branched C 2-12  hydrocarbon chain substituted with one or more hydroxyl. 
     
     
         98 . The composition of  claim 87 , wherein the coordinating ligand is attached to the surface of the nanocrystal. 
     
     
         99 . The composition of  claim 87 , wherein the coordinating ligand is covalently bonded to the surface of the nanocrystal. 
     
     
         100 . The composition of  claim 87 , wherein the coordinating ligand forms a passivation layer on the surface of the nanocrystal. 
     
     
         101 . A light emitting device comprising the composition of  claim 87 . 
     
     
         102 . A method of stabilizing one or more nanocrystals, comprising:
 coating the one or more nanocrystals with a coordinating ligand, wherein the coordinating ligand has the formula   
       
         
           
           
               
               
           
         
       
       wherein k is 2, 3 or 5, and n is 1, 2, 3, 4 or 5, such that k-n is not less than zero; and each of Y and L, independently, is aryl, heteroaryl, or a straight or branched C 2-12  hydrocarbon chain optionally containing at least one double bond, at least one triple bond, or at least one double bond and one triple bond, the hydrocarbon chain being optionally substituted with one or more C 1-4  alkyl, C 2-4  alkenyl, C 2-4  alkynyl, C 1-4  alkoxy, hydroxyl, halo, amine, nitro, cyano, C 3-5  cycloalkyl, 3-5 membered heterocycloalkyl, aryl, heteroaryl, C 1-4  alkylcarbonyloxy, C 1-4  alkyloxycarbonyl, C 1-4  alkylcarbonyl, or formyl; and the hydrocarbon chain being optionally interrupted by —O—, —S—, —N(R a )—, —N(R b )—C(O)—O—, —O—C(O)—N(R a )—, —N(R a )—C(O)—N(R b )—, —O—C(O)—O—, —P(R a )—, or —P(O)(R a )—, wherein each of R a  and R b , independently, is hydrogen, alkyl, alkenyl, alkynyl, alkoxy, hydroxylalkyl, hydroxyl, or haloalkyl. 
     
     
         103 . The method of  claim 102 , wherein X is O, S, S═O, SO 2 , Se, Se═O, N, N═O, P, P═O, As, or As═O. 
     
     
         104 . The method of  claim 102 , wherein each of Y or L, independently, comprises a straight or branched C 2-12  hydrocarbon chain substituted with one or more amines. 
     
     
         105 . The method of  claim 102 , wherein each of Y or L, independently, comprises a straight or branched C 2-12  hydrocarbon chain substituted with multiple amines. 
     
     
         106 . The method of  claim 104 , wherein the one or more amine is attached to the surface of the nanocrystal. 
     
     
         107 . The method of  claim 102 , wherein each of Y or L, independently, comprises a straight or branched C 2-12  hydrocarbon chain substituted with one or more hydroxyl.