Micronano\nLasers\nBased on Aggregation-Induced Emission\nMolecules: Diverse Resonant Cavities Investigation

Aggregation-induced\nemission (AIE) molecules have great\npotential\nto enhance the performance of micronano lasers due to their excellent\naggregated luminescence properties, so it is valuable to expand their\napplications in micronano lasers. In this work, a typical AIE active\nfluorescent dye motif 9,10-bis(2,2-diphenylvinyl) anthracene (BDPVA)\nwas selected as the gain medium. First, drop-casting was used to fabricate\nBDPVA single-crystal nanowires, which can be used as Fabry–Perot\n(FP)-type resonators with a lasing threshold of 49.4 μJ/cm<sup>2</sup>. Furthermore, we innovatively doped BDPVA molecules as gain\nmediums into external polymer Whispering-Gallery-Mode (WGM)-type resonators\nvia the emulsion self-assembly method. Fabricated BDPVA-doped polystyrene\n(PS) microspheres exhibit a much lower lasing threshold of 9.04 μJ/cm<sup>2</sup>. These results prove that the BDPVA molecules, in addition\nto realizing the reported AIE single-crystal lasers, can also be used\nas a guest-doped gain medium in the resonant cavity for obtaining\nbetter fluorescence gain. In addition, multimode tunability of two\ntypes of lasers has been successfully achieved by tuning the structure\nof the resonant cavity. This work further expands the application\npotential of AIE materials and will provide a useful reference for\nthe rational design and fabrication of photonic micronano laser components\nusing AIE materials.