Indeno[2,1-b] carbazole-based Hole transport material based on indeno[2,1-b] carbazole as well as preparation method and application of hole transport material

The invention discloses an indeno[2,1-b] carbazole-based hole transport material and a preparation method and application thereof; the chemical structural formula of the hole transport material is represented by a formula Y1 or Y2. The preparation method comprises the following steps: carrying out alkylation reaction on a compound (4) to generate an intermediate (5); reducing nitro in the intermediate (5) into amino to generate an intermediate (6); carrying out cyclization reaction on the intermediate (6) and 3,3'-dibromo-2,2'-bithiophene to generate an intermediate (7); carrying out substitution reaction on the intermediate (7) to generate an intermediate (8); carrying out bromination reaction on the compound (9) to generate an intermediate (10); carrying out alkylation reaction on the intermediate (10) to generate an intermediate (11); carrying out coupling reaction on the intermediate (11) and 2-tributyltin alkyl thiophene to generate an intermediate (12); carrying out bromination reaction on the intermedi