Host–guest composite organic microlasers
Organic microlasers are miniaturized coherent light sources with great promise for advancing the field of optoelectronics. Recently, host–guest composite organic microlasers, where the host materials provide spatial confinement for the organic gain materials, have captured much research interest because the host–guest composite material systems endow the organic microlasers with improved lasing performances, such as low threshold, high stability, and excellent tunability. In this Review, we explore the latest advancements in the development of host–guest composite organic microlasers, and offer our perspective on future improvements and trends. Special emphasis is put on the construction strategies and the unique laser properties of the organic microlasers based on host–guest confinement systems. The comprehensive understanding of the relationship between laser performances and the synergistic interactions of the host and guest materials would provide a useful guidance for the design and fabrication of novel organic microlasers.