软硬段交替型蓝绿色发光共聚物及其电致发光性能研究

Electroluminescence Properties of an Alternating Blue-green light-emitting Copolymer Consisting of Soft and Rigid Segments

合成了一种分子主链由发光链段-1,5 二(3,5 二甲氧基苯乙烯基)萘与柔性隔离链段—三缩二乙二醇组成的交替型蓝绿色发光聚合物(TEO VN)。该聚合物能溶于氯仿、甲苯、二氯甲烷等有机溶剂中,旋涂制成的薄膜高度透明、均匀、无针孔。其Tg为42℃。TEO VN具有优异的耐热稳定性,在氮气中的最低分解温度高达409℃。对其发光性能的研究表明,TEO VN是一种典型的蓝绿色发光聚合物,其最大发射峰处于499nm。以TEO VN装配的发光二极管(LED)的起亮电压为5V,在正向偏压为20V时,最大发光亮度为275cd/m2。

A bluegreen lightemitting copolymer (TEONV) containing alternating 1,5(3,5dimethyloxy styrene) naphthalene as chromophore and tri(ethylene oxide) as functional spacer, was synthesized. Its chemical structure were characterized and luminescent properties was investigated. Thermal properties were measured with DSC and TGA under nitrogen atmosphere. The results show that TEONV has excellent thermal stability and the decomposition temperature is high up to 409 ℃ with Tg = 42 ℃. TEONV can be soluble in many organic solvents, such as chloroform, methylene dichloride and toluene, and the polymer solution can be spincoated onto various substrates giving highly transparent and homogeneous thin film. TEONV is a typical bluegreen lightemitting copolymer with a maximum EL emitting peaks at 499 nm. A lightemitting diode (LED) based on TEONV was successfully fabricated. Its threshold voltage was ca. 5 V for light emission, and the maximum brightness was 295 cd/m2 at forward bias 20 V. 