Low energy gap small molecule material and organic optoelectronic device using the same

A low energy gap small molecule material, comprising a structure of Formula I:

• wherein o and p are 1, and m, n, x and y are independently selected from any integer from 0 to 2;
• Ar0, Ar1 and Ar2 are electron-donating groups;
• A0 is a tricyclic structure with or without substituents, the tricyclic structure containing heteroatom, and the heteroatom comprises at least one of S, N, Si and Se, wherein each A0 in the structure of Formula 1 is independently selected from the group consisting of:
• wherein z is any integer from 1 to 8;
• Ar3 and Ar4 are independently selected from the group consisting of:
• aromatic ring with one or more R2 or without substituent, heterocyclic ring with one or more R2 or without substituent, fused ring with one or more R2 or without substituent, fused heterocyclic ring with one or more R2 or without substituent;
• and
• Ar5 is independently selected from the group consisting of:
• C1-C30 alkyl, C3-C30 branched alkyl, C1-C30 silyl, C2-C30 ester, C1-C30 alkoxy, C1-C30 alkylthio, C1-C30 haloalkyl, C2-C30 olefin, C2-C30 alkyne, C2-C30 cyano-containing carbon chain, C1-C30 nitro-containing carbon chain, C1-C30 hydroxy-containing carbon chain, C3-C30 keto-containing carbon chain, halogen, cyano and hydrogen, aromatic ring with one or more R3 or without substituent, heterocyclic ring with one or more R3 or without substituent, fused ring with one or more R3 or without substituent, fused heterocyclic ring with one or more R3 or without substituent;
• wherein each of R2 and R3 is independently selected from the group consisting of:
• C1-C30 alkyl, C3-C30 branched alkyl, C1-C30 silyl, C2-C30 ester, C1-C30 alkoxy, C1-C30 alkylthio, C1-C30 haloalkyl, C2-C30 olefin, C2-C30 alkyne, C2-C30 cyano-containing carbon chain, C1-C30 nitro-containing carbon chain, C1-C30 hydroxy-containing carbon chain, C3-C30 keto-containing carbon chain, halogen, cyano and hydrogen;
• and
• A1 is an electron-withdrawing group with or without substituents, and the structure of the electron-withdrawing group comprises at least one of S, N, Si, Se, C═O, —CN and SO2.