Department of Chemistry , Indian Institute of Engineering Science and Technology , Shibpur, Howrah 711103 , India.
Department of Chemistry , Jadavpur University , Kolkata 700032 , India.
ACS Appl Mater Interfaces. 2018 May 23;10(20):17409-17418. doi: 10.1021/acsami.8b00165. Epub 2018 May 9.
Luminescent materials possessing both the mechanoluminescence (MCL) and electroluminescence (EL) properties are the quest for sensing and optoelectronic applications. We report on the synthesis of a new tailor-made luminogen, 1,2-bis(4-(1-([1,1'-biphenyl]-4-yl)-2,2-diphenylvinyl)phenyl)-1,2-diphenylethene (TPE 5), using Suzuki coupling reaction with high yield. An aggregation-induced emission (AIE) active complex TPE 5 forms supramolecular spherical aggregates at the air-water interface of a Langmuir trough. As a consequence, a large enhancement of luminescence is obtained from the mono- and multilayer Langmuir-Blodgett films of TPE 5 owing to the AIE effect. The luminogen TPE 5 exhibits a reversible MCL response, displaying photoluminescence switching due to change in the crystalline states under external stimuli. The unique feature of luminescence enhancement upon aggregate formation is utilized for the fabrication of light-emitting diodes with low threshold voltage using supramolecular aggregates as the active layer. This work demonstrates an efficient strategy for obtaining controlled supramolecular aggregates of AIEgen with a potential in the dual applications of MCL and EL.
具有力致发光 (MCL) 和电致发光 (EL) 性能的发光材料是传感和光电应用的追求。我们报告了一种新的定制发光体，1,2-双(4-(1-([1,1'-联苯]-4-基)-2,2-二苯基乙烯基)苯基)-1,2-二苯基乙烯(TPE 5)，通过 Suzuki 偶联反应高产率合成。聚集诱导发射(AIE)活性配合物 TPE 5 在Langmuir 槽的气-水界面上形成超分子球形聚集体。结果，由于 AIE 效应，TPE 5 的单层和多层 Langmuir-Blodgett 薄膜获得了发光的大幅增强。发光体 TPE 5 表现出可逆的 MCL 响应，由于外部刺激下晶体状态的变化，显示出光致发光的开关。在聚集态下形成发光增强的独特特性被用于制造使用超分子聚集体作为有源层的具有低阈值电压的发光二极管。这项工作展示了一种获得具有 MCL 和 EL 双重应用潜力的 AIEgen 可控超分子聚集体的有效策略。
