取代三苯胺对三苯胺-芴-苯并噻二唑共聚物光致发光性能的影响  

Effects of Substituted Triphenylamines on Photoluminescent Properties of Triphenylamine-Fluorene-Benzothiadiazole Copolymers

作　　者：陈彬彬[1] 米衡[1] 高山[1] 李坚[1] 任强[1] 汪称意[1] 

机构地区：[1]常州大学材料科学与工程学院材料化学系,江苏省太阳能电池及材料重点实验室,江苏常州213164

出　　处：《高校化学工程学报》2015年第4期1010-1015,共6页Journal of Chemical Engineering of Chinese Universities

摘　　要：采用Suzuki偶合反应合成了取代基团分别为三氟甲基（P1），甲基（P2），叔丁基（P3）的三苯胺-芴-苯并噻二唑类聚合物。并通过核磁共振法，凝胶渗透色谱法，热重分析法，紫外-可见光光谱法，荧光光谱法等研究了三苯胺上不同取代基对共聚物性能的影响，并对这三者的光学性能及电化学性能进行了比较。这些聚合物的分子量在13300～22000，并且均能溶于常见溶剂中如四氢呋喃、甲苯、氯仿等。P1，P2，P3在薄膜状态下荧光发射波长分别为535、539和545nm。聚合物的光学性质受三苯胺基团上取代基的空间体积及推拉电子能力的大小共同影响，当取代基团的空间位阻及吸电子能力由P3到P2到P1逐渐变大时，聚合物的能带隙宽也逐渐变大，同时使聚合物的紫外-可见光吸收峰及荧光发射峰的波长蓝移。利用这种性质可以对三苯胺-芴-苯并噻二唑聚合物的光致发光性能进行精细调节，从而得到发出纯正绿光的材料。其中的带有三氟甲基（P1）的聚合物表现出相对较纯正的绿色荧光。使得P1成为一种非常有前景的光致发光器件用聚合物。Three triphenylamine-fluorene-benzothiadiazole （TFB） copolymers with substituents of trifluoromethyl （P1）, methyl （P2） and tert-butyl （P3）, respectively, were synthesized via Suzuki reaction. The influence of substitutional radical on the properties of triphenylamine-fluorene-benzothiadiazole copolymers was investigated respectively with ^1H-NMR, GPC, TGA, UV-visible absorption spectroscopy, photoluminescence （PL） spectroscopy and cyclic voltammetry （CV）. These copolymers have molecular weights of 13300-22000 with good solubility in solvents such as THF, chloroform and toluene.The emission spectra of P1, P2 and P3 under film state are 535 nm, 539 nm and 545 nm, respectively. The luminance property of the copolymers is affected both by the spacial volume and electron-withdrawing ability of the substitutional radical on the TFB. When the spacial resistance and electron-withdrawing ability gradually enlarge in the sequance of P3〈P2〈P1, the emission and ultra-violet absorption wavelengths will blue-shift, and the band gaps of the copolymers in film state will broaden. These results indicate that it can be applied to precisely adjust the photoluminescence properties of triphenylamine-fluorene-benzothiadiazole copolymers to obtain relatively pure green light-emitting materials. The triphenylamine-ftuorene-benzothiadiazole copolymer with the trifluoromethyl substituent （P1） emits a relatively pure green light, which makes P 1 a very promising copolymer for polymer light emitting devices.

关 键 词：聚合物电致发光器件 三苯胺-芴-苯并噻二唑共聚物 绿光 荧光 

分 类 号：O631.2[理学—高分子化学]