Divalent platinum complex

A bivalent platinum complex, having a structural formula as shown in a formula (I):

• wherein one site of R1-R6 in R1-R24 is connected to one site of R7-R10 by a C—C bond, remaining sites and A0 are independently selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl containing 1-20 carbon atoms, substituted or unsubstituted cycloalkyl containing 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl containing 1-20 carbon atoms, substituted or unsubstituted aralkyl containing 7-30 carbon atoms, substituted or unsubstituted alkoxyl containing 1-20 carbon atoms, substituted or unsubstituted aryloxyl containing 6-30 carbon atoms, substituted or unsubstituted alkenyl containing 2-20 carbon atoms, substituted or unsubstituted aryl containing 6-30 carbon atoms, substituted or unsubstituted heteroaryl containing 3-30 carbon atoms, substituted or unsubstituted alkylsilyl containing 3-20 carbon atoms, substituted or unsubstituted arylsilyl containing 6-20 carbon atoms, substituted or unsubstituted amino containing 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester group, cyano, thio, sulfinyl, sulfonyl, and phosphino, or any adjacent two of the R1-R24 are connected to each other through a covalent bond to form a ring;
• Ar is selected from substituted or unsubstituted alkyl containing 1-20 carbon atoms, substituted or unsubstituted cycloalkyl containing 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl containing 1-20 carbon atoms, substituted or unsubstituted aralkyl containing 7-30 carbon atoms, substituted or unsubstituted alkoxyl containing 1-20 carbon atoms, substituted or unsubstituted aryloxyl containing 6-30 carbon atoms, substituted or unsubstituted alkenyl containing 2-20 carbon atoms, substituted or unsubstituted aryl containing 6-30 carbon atoms, substituted or unsubstituted heteroaryl containing 3-30 carbon atoms, substituted or unsubstituted alkylsilyl containing 3-20 carbon atoms, and substituted or unsubstituted arylsilyl containing 6-20 carbon atoms;
• the heteroalkyl or the heteroaryl comprises an N, S, or O heteroatom;
• and the “substituted” refers to substitution with deuterium, halogen, amino, nitro, cyano, or C1-C4 alkyl.