含噻二唑聚芴类白光聚合物的合成与发光性能研究

Synthesis and Luminescent Properties of Polyfluorene Containing Thiadiazole as White Light-emitting Polymer

通过Suzuki偶联反应将2,7-二溴-9,9-二辛基芴(Br-DOF)、2,7-二硼酸-9,9-二辛基芴(B-DOF)和4-(8-(2,7-二溴-9-辛基芴)辛氧基)-N-4-(7-(4-(二苯胺基)苯基)苯并噻二唑)苯基-二苯胺(Br-TAF)共聚,合成了白光聚合物PDOF-TAF。以PDOF-TAF为发光层,溶液旋涂制备了非掺杂型单层白光有机电致发光二极管,色坐标为(0.23,0.18)。通过插入电子传输层TPBI和空穴传输层PVK得到的白光器件发射光谱覆盖了410～700 nm区域,色坐标从(0.23,0.18)调整到(0.24,0.32),亮度达到2 020 cd/m2,电流效率达到1.4 cd/A。实验结果表明,PDOF-TAF是一种很好的白光聚合物发光材料,在WOLED中将有很好的应用前景。

Polyfluorene containing thiadiazole( PDOF-TAF) was synthesized by palladium-catalyzed Suzuki cross coupling reaction of 2,7-dibromo-9,9-dioctyl-9Hfluorene( Br-DOF),9,9-dioctyl9H-fluorene-2,7-diyldiboronic acid( B-DOF) and 4-( 8-( 2,7-dibromo-9-octyl-9H-fluoren-9-yl) octyloxy)-N-(4-(7-(4-(diphenylamino) phenyl) benzo [c][1,2,5]thiadiazol-4-yl) phenyl)-N-phenylaniline( Br-TAF). The synthesized polymer was applied as white light-emitting polymer and was used as the emitting layer to prepare the non-doped white organic light-emitting diodes( WOLED) by spin-coating. The color coordinates locate at( 0. 23,0. 18). By inserting 1,3,5-tris(1-phenyl1H-benzimidazol-2-yl) benzene( TPBI) as electron transport layer and Poly( N-vinylcarbazole)( PVK) as hole transport layer,the emission spectra of the diode cover 410 ～700 nm visible region, and the color coordinates shift to( 0. 24,0. 32),locating close to the white point. In addition,the luminescence and current efficiency can reach up to 2 020 cd / m2and 1. 4 cd / A,respectively,indicating that the synthesized polymer has highly potential application as the material of white lightemitting layer in WOLED.