A polymer comprising repeat units of formula (I) and one or more co-repeat units:
Ar1 in each occurrence independently represent an aryl or heteroaryl group;
R1 and R2 in each occurrence independently represent a substituent;
p independently in each occurrence is 0 or a positive integer;
Sp represents a spacer group comprising at least one carbon or silicon atom spacing the two groups Ar1 apart; and
each group Ar1 is bound to an aromatic group of a co-repeat unit.
The polymer may form a charge-transporting layer of an OLED or may be a host material used with a luminescent dopant in a light-emitting layer of an OLED.
                            一种聚合物,包括公式(I)的重复单元和一个或多个共重复单元:每次出现的Ar1独立表示芳基或杂环芳基;每次出现的R1和R2独立表示一个取代基;每次出现的p独立表示0或正整数;Sp表示包含至少一个碳或
硅原子的间隔两个Ar1基团的间隔基团;每个Ar1基团与共重复单元的芳香基团相结合。该聚合物可以形成OLED的传输电荷层,也可以作为OLED的发光层中与发光掺杂剂一起使用的宿主材料。