Dibenzofurane polymers for electroluminiscent devices

Electroluminescent material comprising a homopolymer based on recurring structural units of the formula I

• wherein
• R9, R9′, R11, R13, R14, R11′, R13′, R14, independently are H or an organic substituent selected from halogen;
• OH;
• C1-C24alkoxy;
• C2-C24alkoxy which is substituted by E and/or interrupted by D;
• C1-C24alkyl;
• C1-C24alkyl which is substituted by E and/or interrupted by D;
• C1-C24haloalkyl;
• C2-C24alkenyl;
• C2-C24alkynyl;
• C1-C24alkylthio;
• C1-C24acyl;
• C5-C24aryl;
• C6-C24aryl which is substituted by G;
• C7-C25aralkyl;
• C3-C12cycloalkyl;
• C1-C24acyloxy;
• C5-C10aryloxy;
• C3-C12cycloalkyloxy;
• COR;
• CH═NR;
• CH═N—OH;
• CH═N—OR;
• COOR;
• OCOR;
• CONHR;
• NHCOR;
• CONRR′;
• CONH—NHR;
• CONH—NRR;
• SR;
• SO2R;
• SO3R;
• SO2NHR;
• SO2NRR′;
• SO2NH—NHR;
• SO2NH—NRR′;
• S(O)R;
• S(O)OR;
• S(O)NHR;
• S(O)NRR′;
• S(O)NH—NHR;
• S(O)NH—NRR′;
• SiRR′R″;
• GeRR′R″;
• PRR′;
• PORR′;
• PO(OR)R′;
• PO(OR)2;
• PO(NHR)2;
• PO(NRR′)2;
• CN;
• NO2;
• NHR;
• NRR′;
• NH—NHR;
• NH—NRR′, CONROH;
• where R, R′ and R″ independently are selected from C1-C12alkyl, C1-C12haloalkyl, C5-C10aryl, C3-C12cycloalkyl;
• and R may also be hydrogen;
• or two substituents R9, R11, R13, R14, R9′, R11′, R13′ and R14′, which are adjacent to each other, together form a group
• R105, R106, R107, R108, R105′, R106′, R107′ and R108′ are independently of each other H, C1-C18alkyl, C1-C18alkyl which is substituted by E and/or interrupted by D, C1-C18alkoxy, or C1-C18alkoxy which is substituted by E and/or interrupted by D;
• D is —CO—;
• —COO—;
• —S—;
• —SO—;
• —SO2—;
• —O—;
• —NR25—;
• —SiR30R31—;
• —POR32—;
• —CR23═CR24—;
• or —C≡C—;
• and
• E is —OR29;
• —SR29;
• —NR25R26;
• —COR28;
• —COOR27;
• —CONR25R26;
• —CN;
• or halogen;
• G is E, C1-C18alkyl, C3-C12cycloalkyl, C2-C18alkyl which is interrupted by D, C1-C18perfluoroalkyl, or C1-C18alkoxy which is substituted by E and/or interrupted by D, wherein
• R23, R24, R25 and R26 are independently of each other H;
• C6-C18aryl;
• C6-C18arylalkyl;
• C3-C12cycloalkyl;
• C6-C18aryl or C6-C18arylalkyl which is substituted by C1-C18alkyl and/or C1-C18alkoxy;
• C1-C18alkyl;
• or C2-C18alkyl which is interrupted by —O—;
• or
• R25 and R26 together form a five or six membered ring;
• R27 and R28 are independently of each other H;
• C6-C18aryl;
• C6-C18arylalkyl;
• C6-C18aryl or C6-C18arylalkyl which is substituted by C1-C18alkyl and/or C1-C18alkoxy;
• C1-C18alkyl;
• C3-C12cycloalkyl;
• or C2-C18alkyl which is interrupted by —O—;
• R29 is H;
• C6-C18aryl;
• C6-C18arylalkyl;
• C6-C18aryl or C6-C18arylalkyl which is substituted by C1-C18alkyl and/or C1-C18alkoxy;
• C1-C18alkyl;
• C2-C18alkylcarbonyl;
• C3-C12cycloalkyl;
• or C2-C18alkyl or C2-C18alkylcarbonyl which is interrupted by —O—;
• R30 and R31 are independently of each other C1-C18alkyl, C3-C12cycloalkyl, C6-C18aryl, or C6-C18aryl, which is substituted by C1-C18alkyl, and
• R32 is C1-C18alkyl, C6-C18aryl, or C6-C18aryl, which is substituted by C1-C18alkyl,
• R, R′ and R″ independently are selected from C1-C12alkyl, C1-C12haloalkyl, C5-C10aryl, C3-C12cycloalkyl;
• and
• Ar independently is selected from C5-C10aryl, or C5-C10aryl which is substituted by C1-C18alkyl;
• and one of R9, R9′, R11, R13, R14, R11′, R13′, R14,, R105, R106, R107, R108, R105′, R106′, R107′, R108′ is a group R10 of the formula
• —(SP)x10-[PG′]<
• wherein Sp is a divalent organic spacer, PG′ is a group derived from a polymerisable group, and x10 is 0 or 1;
• and Sp is of the formula
• (X3-Ds)x11-X2,
• wherein x11 is 0 or 1;
• X3, X2 independently are O, C1-C4alkylene-O, S, C1-C4alkylene-S, NR22, C1-C4alkylene-NR22, COO, C1-C4alkylene-COO or C1-C4alkylene-OCO, CONR22, C1-C4alkylene-CONR22 or C1-C4alkylene-NR22CO, NR22CONR22, C1-C4alkylene-NR22CONR22, C1-C4alkylene, or a direct bond;
• R22 is H, C1-C12alkyl, C3-C12cycloalkyl, phenyl;
• Ds is C1-C24alkylene, interrupted C3-C24alkylene, C2-C24alkenylene, C2-C24alkynylene, C6-C10arylene;
• and
• PG′ is derived from an ethylenically unsaturated group or a strained oxygen ring system, selected from those of the formulae
• where the asterisk indicates its bonding position to Sp or the moiety of formula I and R is as defined above, while the 2 further open bonds provide integration into the copolymer chain.