Epitaxial Growth of\nTwo-Dimensional Organic Crystals\nwith In-Plane Heterostructured Domain Regulation

Complex\norganic lateral heterostructures (OLHs) with\nspatial distribution\nof two or more chemical components are crucial for designing and realizing\nunique structure-dependent optoelectronic applications. However, the\nprecise design of well-defined OLHs with flexible domain regulation\nremains a considerable challenge. Herein, we present a stepwise solution\nself-assembly method to synthesize two-dimensional (2D) OLHs with\na central rhombus domain and a lateral region featuring tunable blue\nand green emission based on the sequential nucleation and growth of\n2D crystals. By controlling the initial crystallization time of 2,6-diphenylanthracene,\nthe rhombic length ratio (α) of the multicolor-emissive part\nof the 2D OLHs is precisely modified. Furthermore, a third lateral\nlayer is constructed on the resulting OLHs, demonstrating scalable\nlateral regulation. Significantly, these prepared 2D OLHs exhibit\ngreat excitation position-dependent waveguide characteristics and\nenable a 0.06 dB/μm low-loss waveguiding, which are conducive\nto photon transport and conversion for photonic integrated circuits.\nThis work provides a stepwise strategy for the accurate fabrication\nof 2D OLHs, fabricating the developments of next-generation optoelectronics\ndevices.