Influence of chlorine atoms in bay positions of perylene-tetracarboxylic acids on their spectral properties in Langmuir-Blodgett films
作者:Emilia Piosik、Anna Synak、Tomasz Martyński
DOI:10.1016/j.saa.2017.08.043
日期:2018.1
significantly shorter than these obtained for the same emitter types in the Pn monolayers. In the case of the chlorinated dyes, the contribution of the monomer emission dominates over the excimer emission and is almost independent from the alkyl chain length. By contrast, the share of the Pn monomer emission increases strongly with a number of carbon atoms in their hydrocarbon chains. The luminescence
研究了不同烷基链长的per-3,4,9,10-四羧酸的海湾位置中氯原子对其单分子膜光谱性质的影响。使用Langmuir-Blodgett(LB)技术将氯化per(PCln)和非氯化((Pn)ylene衍生物沉积到石英板上。吸收光谱表明,PCln和Pn染料分别在单层中形成I型和J型聚集体。反过来,它们的稳态和时间分辨发射光谱揭示了两种发射体类型的存在,我们将其分配给单体和准分子。与时间相关的单光子计数方法(TCSPC)确定的PCln单体和受激准分子的发光寿命明显短于Pn单层中相同发射体类型的发光寿命。在氯化染料的情况下,单体发射的贡献超过准分子发射,并且几乎与烷基链长无关。相反,Pn单体排放的份额随其烃链中碳原子数的增加而大大增加。在积分球中测得的Pn和PCln单层的发光量子产率(LQY)在0.06-0.11的范围内。呈现的结果表明,PCln染料比非氯化衍生物具有更低的聚集趋势。这可以通过相