发蓝光聚醚醚酮材料的合成及其光电特性

通过4-羟基苯甲醛与2,6-二(4-氯甲基苯基)苯并1-2,4-5′]二唑之间的Wittig反应,制备了具有蓝色荧光特性的小分子单体2,6-二{4-2-(4-羟基苯基)乙烯基]苯基}苯并1-2,4-5′]二唑,在碳酸钾的催化作用下,通过其与4,4′-二氟二苯甲酮的缩聚反应,设计并合成了以均二苯乙烯为共轭母核的可发射蓝光的聚醚醚酮材料(BOE-PEEK),并对其结构进行了表征.测定结果表明,该聚合物的平均分子量(-Mw)为1.38×10⁵,均分散系数(PDI)为4.35,玻璃化温度(T_g)为195℃,热分解温度(T_d)为440℃,BOE-PEEK在二甲基乙酰胺(DMA)溶剂中的UV-Vis吸收光谱(λ_max)为372 nm,荧光光谱(λ_max)为455nm,由导电玻璃/发光层/金属铝电极(ITO/BOE-PEEK/Al)组成的单层器件在电压15 V时,发光亮度达530 cd·cm^-2,发光效率为0.36 cd/A.

Synthesis and Photo-luminescent Properties of PEEK with Blue Light-Emitting

Novel BOE-PEEK with blue light-emitting had been designed and synthesized by direct nucleophilic substitution reaction of difluoromonomer and 2,6-bis｛4-2-(4-hydroxylphenyl)ethylene]phenylene｝benzo1-2,4-5′]dioxazole as blue light-emitting core,which was prepared through Wittig reaction of 4-hydroxylbenzaldehyde with 2,6-bis(4-chloromethylphenylene)benzo1-2,4-5′]dioxazole.The chemical structures of BOE-PEEK have been determined by the spectra,GPC,DSC and TGA.The analytic results showed the weight average molecular weight(w) was 1.38×105,poly-dispersity index(PDI) was 4.35,glass transition temperature(Tg) was 195 ℃,beginning to decompose(Td) at 440 ℃.The spectra data of BOE-PEEK gave that UV-Vis absorption λmax was 372 nm and photoluminescent λmax was 455 nm.When driving voltage was up to 15 V,the device brightness reached 530 cd/cm2 and EL efficiency was 0.36 cd/A,which was consisted of substrate glass/indium-tin-oxide anode/BOE-PPV(single light-emitting layer)/aluminum cathode.