Two-Dimensional Organic Semiconductor Crystals for Photonics Applications

Two-dimensional (2D) organic crystals with significant advantages, such as high crystallinity, well-defined shape, and dimension-dependent optical properties, have been widely investigated in recent decades. At present, 2D organic crystals have been successfully applied to lasers, optical waveguides, organic light-emitting transistors, and organic light-emitting diodes. However, it is still a challenge for organic crystals to achieve controllable preparation, high charge mobility, and simultaneously efficient light emission because organic molecules mainly rely on noncovalent interactions (such as the van der Waals' force and the hydrogen bonding). To introduce the superior characteristics and summary the huge breakthroughs of 2D organic crystals, we herein briefly review the recent progress in terms of growth strategies and potential applications in high-performance organic photonic devices and optoelectronic devices. In addition, we present our conclusion and expectation for the future development of 2D organic crystals.