Abstract：
Emissive covalent organic frameworks (COFs) are a promising class of crystalline materials that have demonstrated applications for sensing and light-emitting diodes. However, white light emission from a single COF has not been achieved yet as it requires multicomponent organic chromophores that simultaneously emit blue, green, and red light. In this work, we report the successful synthesis of a single COF with efficient white light emission by utilizing tunable emission properties of 2,1,3-benzothiadazole after incorporating different functional groups on its core structure, which results in the formation of three ligands, i.e., 4\',4-(benzothiadiazole-4,7-diyl)-dibenzaldehyde (BTD), 4,4\'-(benzoselenadiazole-4,7-diyl)-dibenzaldehyde (BSD), and 4,4\'-(naphtho[2,3-c][1,2,3] selenadiazole-4,9-diyl)-dibenzaldehyde (NSD), that emit in the blue, green, and red regions of the visible light spectrum. We show that white light emission can only occur when BTD, BSD, and NSD are assembled in a single COF structure due to the facilitated energy transfer process from BTD to BSD/NSD. This work demonstrates a unique approach to developing new white light-emitting materials based on the COF structure.
摘要：
发光共价有机骨架（COF）是一类有前途的晶体材料，已证明可用于传感和发光二极管。然而,单一COF发出的白光尚未实现，因为它需要同时发出蓝色的多组分有机发色团，绿色,和红灯。在这项工作中,我们报道了在其核心结构上掺入不同官能团后，利用2,1,3-苯并噻二唑的可调发射性能，成功合成了具有有效白光发射的单一COF，这导致三个配体的形成，即，4\',4-(苯并噻二唑-4,7-二基)-二苯甲醛(BTD)，4,4'-(苯并硒二唑-4,7-二基)-二苯甲醛(BSD)，和4,4'-(萘并[2,3-c][1,2,3]硒二唑-4,9-二基)-二苯甲醛(NSD)，发出蓝色，绿色,和可见光谱的红色区域。我们表明，只有当BTD，BSD,和NSD由于从BTD到BSD/NSD的促进的能量转移过程而组装在单个COF结构中。这项工作展示了一种独特的方法来开发基于COF结构的新型白色发光材料。
