聚芴主链含D-A型萘并噻二唑和苯并硒二唑衍生物的红光高分子发光材料

Red Electroluminescent Polyfluorenes Containing D-A Type Naphthothiadiazole and Benzoselenadiazole Derivatives in the Main Chain

设计合成了新型的含萘并噻二唑(NT)或苯并硒二唑(BS)电子受体单元的D-A型红光掺杂剂,将它们引入到聚芴(PFO)的主链,调节掺杂剂含量,合成了一系列具有"掺杂剂/主体"特性的红光高分子材料含萘并噻二唑衍生物的聚芴(PFR-xNT)和含苯并硒二唑衍生物的取芴(PFR-xBS)。这些红光高分子的吸收光谱主要表现为聚芴主体的吸收,荧光光谱既有主体聚芴的蓝光峰,也有掺杂剂的红光峰,并且红光峰的相对强度随着掺杂剂含量的增加而增强。与光致发光光谱不同,这些高分子的电致发光光谱主要表现为掺杂剂的红光发射,并在掺杂的摩尔分数达到1%时实现了主体聚芴向红光掺杂剂的完全能量转移。其中PFR-10NT和PFR-10BS的单层器件(ITO/PEDOT:PSS/Polymer/Ca/Al)(PEDOT:聚3,4-乙烯二氧噻吩;PSS:聚苯乙烯磺酸)分别实现了电流效率1.61 cd/A,最大发射波长632 nm,CIE色坐标(0.63,0.35)以及电流效率1.10 cd/A,最大发射波长620 nm,CIE色坐标(0.63,0.36)的高效红光发射。

Two novel D-A type red dopants containing naphthothiadiazole（NT） or benzoselenadiazole（BS） electron withdrawing unit were synthesized.Through covalently attaching red dopants to polyfluorene（PFO） backbones and tuning the doping concentration,we obtained a series of red polymers.All these red polymers exhibit similar absorption spectra as PFO.Their photoluminescent（PL） spectra show not only blue emission from the PFO backbone but also red emission from the dopant.The relative intensity of the red emission increases successively with doping concentration.Unlike the PL spectra,the electroluminescent（EL） spectra of all the polymers predominantly exhibit red emission,which is attributed to the red dopants,with a weak blue emission from PFO backbone.It realizes completely energy transfer from PFO host to red dopants at 1% molar fraction doping level.The single-layer devices with the configuration of ITO / PEDOT： PSS / polymer / Ca / Al（PEDOT： poly（3,4-ethylenedioxythiophene）;PSS： poly（styrenesulfonate）） show saturated red emission at 632 nm with a luminous efficiency of 1.61 cd / A and CIE of（0.63,0.35） for PFR-10NT,and pure red emission at 620 nm with a luminous efficiency of 1.10 cd / A and CIE of（0.63,0.36） for PFR-10BS,respectively.