基于并环螺芴氧杂蒽类单体的链柔性化蓝光聚合物及其柔性有机发光二极管

Chain Flexible of Blue Light-emitting Polymer Based on Parallel Spiro-Fluorenexanthene Monomers and Flexible Organic Light-emitting Diodes

螺芴氧杂蒽作为一类重要的宽带隙蓝光材料功能砌块,常被用于构筑具有优异光电性能和器件稳定性的聚合物半导体,但螺芴氧杂蒽类聚合物柔性化的构筑却很少被报道.基于此,本文报道了高效合成单螺环/并环螺芴氧杂蒽类单体及其蓝光聚合物,包括均聚物PC8SFX-Homo、PDSFX-Homo和共聚物PC8SFX-Co、PDSFX-Co,其中并环聚合物(PLQYsol=88.2%,EQEmax=0.52%)无论是发光效率还是柔性器件性能均明显优于单螺环体系(PLQYsol=11.1%,EQEmax=0.17%).且并环聚合物表现出更低的内部应力.同时通过主链柔性化策略引入柔性链段共聚在获得更优柔性的同时能够获得更优异的发光性能和更好的柔性发光二极管器件性能.该工作为构建柔性电子应用的宽带隙深蓝光聚合物及其柔性发光显示器件应用提供了新的思路.

Polymer semiconductor has been widely concerned because of its advantages such as easy to adjust structure and large area solution processing,which can meet the needs of light,thin,soft and transparent flexible electrons.Spiro-fluorenexanthene,as an important functional block of wide-band gap blue light materials,which is often used to construct polymer semiconductors with excellent photoelectric properties and device stability.However,the construction of flexible spiro-fluorenexanthene polymers has rarely been reported.Based on this,this paper reports the efficient synthesis of single/parallel spiro-fluorenexanthene monomers and their blue light-emitting polymers,which include homopolymer PC8SFX-Homo,PDSFX-Homo and copolymers PC8SFX-Co and PDSFX-Co.The parallel spiro-fluorenexanthene polymer(PLQYsol=88.2%,EQEmax=0.52%)is significantly superior to the single spiro-fluorenexanthene system(PLQYsol=11.1%EQEmax=0.17%)in terms of luminous efficiency and flexible device performance.Moreover,the parallel spiro-fluorenexanthene polymer exhibit lower internal stresses.At the same time,introducing the flexible chain segment copolymerization through the main chain flexibility strategy can obtain better flexibility and performance of flexible LED devices.This work provides a new idea for the construction of wide-band gap deep blue light-emitting polymer for the application of flexible electronic and flexible light-emitting display devices.