A series of new linear π-conjugated oligomers consisting of five conjugated rings based on 2,1,3-benzothiadiazole (BTD) electron-withdrawing group and various combinations of 2,5-thiophene and 1,4-phenylene electron-donating units with terminal trimethylsilyl groups has been synthesized and characterized. Investigation of their absorption-luminescent properties revealed that all of them possess high photoluminescence (PL) quantum yield and large Stokes shift both in diluted solutions and polymer matrix, while in the solid state their PL efficiency decreases. It was found that the main factor influencing the optical properties of the molecules obtained is the type of aromatic fragment directly attached to the central BTD moiety. Changing the chemical structure of the donor aromatic fragments from 1,1′-biphenyl to 2,2′-bithiophene allows tuning the PL spectral maximum of the luminophores in wide range from 510 to 660 nm. It was shown that the presence of trimethylsilyl groups in these luminophores is responsible for their increased solubility, enhanced molar extinction coefficients and shortening the excited state lifetime without decreasing the PL efficiency.

一系列新的线性π共轭低聚物，由五个基于2,1,3-苯并噻二唑（BTD）吸电子基团的共轭环以及2,5-噻吩和1,4-亚苯基给电子单元的各种组合组成已经合成并表征了末端三甲基甲硅烷基。对它们的吸收发光性质的研究表明，它们在稀释溶液和聚合物基质中均具有高的光致发光（PL）量子产率和大的斯托克斯位移，而在固态时它们的PL效率下降。发现影响获得的分子的光学性质的主要因素是直接附接到中央BTD部分的芳族片段的类型。将供体芳香族片段的化学结构从1,1'-联苯改变为2，2'-联噻吩可在510至660 nm的宽范围内调节发光体的PL光谱最大值。结果表明，在这些发光体中三甲基甲硅烷基的存在是它们增加的溶解度，增加的摩尔消光系数和缩短激发态寿命而不降低PL效率的原因。