Non-conventional luminescent π-organogels with a rigid chemical structure

Low-molecular-weight organogels (LMWGs) with π-conjugated structures typically exhibit excellent photoluminescent properties and have significant potential in optoelectronic materials, sensing, and detection applications due to their large specific surface areas and high sensitivity. Conventional organogelators usually contain multiple amide bonds and long flexible chains to facilitate gelation. In contrast, non-conventional π-conjugated organogelators lack flexible chains, offering enhanced atomic economy. Furthermore, the suppression of non-radiative decay caused by the motion of flexible units could lead to higher emission efficiency. Notably, recent research has indicated that rigid chemical structures are essential for achieving ultra-long room-temperature phosphorescence (RTP) in organogels. This review highlights the structures, photoluminescent properties, and applications of non-conventional LMWGs, and discusses future perspectives and challenges in this emerging field.