Organic single crystals (OSCs) with uniform morphologies and highly ordered molecular aggregations are promising for high-performance optoelectronic devices, such as organic solid-state lasers (OSSLs), organic light-emitting transistors (OLETs), and organic light-emitting diodes (OLEDs). However, manipulating OSC morphologies and aggregation is challenging. In this study, we synthesized two-dimensional (2D) OSCs of 4,4′-bis[(N-carbazole)styryl]biphenyl (BSBCz) in hexagonal and parallelogram microplate (H-MP and P-MP) forms. Both types exhibit H-aggregation in the 2D plate plane but with different molecular transition dipole moment (TDM) orientations. This leads to different photon coupling modes with H-MP and P-MP microcavities. H-MPs enable isotropic 2D-waveguiding, forming whispering gallery mode (WGM) resonators, while P-MPs create unidirectional waveguiding, forming Fabry-Pérot mode (FP) resonators. These resonators can generate low-threshold laser emissions at 467 and 473 nm, respectively, and exhibit superior lasing stability with a half-life exceeding 2 h. Our BSBCz microplate OSCs are attractive candidates to combine controlled organic microcavities with photon transporting for realizing future integrated optoelectronic devices.

中文翻译：

---

多晶型二维有机单晶的形状相关光波导和低阈值激光器

具有均匀形貌和高度有序分子聚集体的有机单晶（OSC）有望用于高性能光电器件，例如有机固态激光器（OSSL）、有机发光晶体管（OLET）和有机发光二极管（ OLED）。然而，操纵 OSC 形态和聚集具有挑战性。在这项研究中，我们合成了六边形和平行四边形微板（H-MP 和 P-MP）形式的 4,4′-双[(N-咔唑)苯乙烯基]联苯 (BSBCz) 二维 (2D) OSC。两种类型都在二维板平面上表现出 H 聚集，但具有不同的分子跃迁偶极矩 (TDM) 方向。这导致 H-MP 和 P-MP 微腔具有不同的光子耦合模式。 H-MP 可实现各向同性 2D 波导，形成回音壁模式 (WGM) 谐振器，而 P-MP 可实现单向波导，形成法布里-珀罗模式 (FP) 谐振器。这些谐振器可以分别产生 467 和 473 nm 的低阈值激光发射，并表现出卓越的激光稳定性，半衰期超过 2 小时。我们的 BSBCz 微板 OSC 是将受控有机微腔与光子传输相结合以实现未来集成光电器件的有吸引力的候选者。