芴-苯并噻二唑-苯胺类共聚物的合成与发光性能

用Suzuki缩聚反应分别将窄带隙单元-苯并噻二唑-二苯胺(DPABT)和苯并噻二唑-三苯胺(TPABT)引入聚芴主链,合成了共聚物PF-DPABT和PF-TPABT,并比较了共聚物的发光性能.随着窄带隙单元含量的增加,其特征发射逐渐增强,说明发生了从聚合物主体单元到窄带隙单元有效的能量转移.两种共聚物在低窄带隙单元含量(1mol%)下的电致发光光谱仅出现窄带隙单元的特征发射,PF-DPABT共聚物为650～680nm之间的饱和红光,而PF-TPABT共聚物为590～610nm之间的橙红光,聚芴主体单元的发射被完全淬灭,说明与光致发光过程相比,电致发光过程中的能量转移更完全.基于共聚物PF-DPABT-1及PF-TPABT-5器件的最大外量子效率分别为1.3%和2.0%,器件结构为ITO/PEDOT:PSS/polymer/Ba/Al,是一类有希望的红光材料.

SYNTHESIS AND LUMINESCENT PROPERTIES OF FLUORENE-BENZOTHIADIAZOLES-ANILINE COPOLYMERS

Narrow band-gap(NBG)units DPABT and TPABT were incorporated into polyfluorene backbones by Suzuki polycondensation,respectively.The luminescent properties of two series of copolymers PF-DPABT and PF-TPABT were investigated comparatively.The typical emission of NBG units increased with increasing their content in the copolymers,because to the efficient energy thansfer from the fluorene segment to the NBG unit occurred.The saturated red emission of PF-DPABT was peaked at 650～680 nm,while the orange-red emission of PF-TPABT was peaked at 590～610 nm.The EL emission was exclusively from the NBG unit,even if the NBG content in the copolymers was as low as 1 mol%,which implied the energy thansfer was more efficient during the EL process.The highest external quantum efficiencies were 1.3% for the device of PF-DPABT-1 and 2.0% for the PF-TPABT-1,respectively,with the device configuration of ITO/PEDOT∶PSS/polymer/Ba/Al,indicating that it was a kind of promising candidate of the red light-emitting materials.