Solvent‐Dependent Growth of Rigid Styrylstilbene Dicarboxylic Acid Microcrystals as Bent Waveguides and Microlasers

Organic single‐crystalline structures can effectively generate and confine photons, which be potential building blocks for the optical circuits. While designing of organic molecules tune photoluminescence (PL) property, it is challenging to achieve efficient laser emission light resonance in different forms molecular aggregates. Herein, a dicarboxylated carbon‐bridged oligophenylenevinylene (COPV2‐(COOH) 2 ) newly synthesized. The THF/water solution COPV2‐(COOH) exhibits green‐color PL with quantum yield >0.90 over range = 100/0–40/60. either bent microrods (MR) or microsheets (MS) depending on crystallization solvents. Significantly, lasing are only observed MS, indicating that MS has better confinement property than MR. features Q‐factor as high 1.8 × 10 3 threshold 222 μJ cm −2 . Finite‐difference time‐domain (FDTD)‐simulated electric field distributions MR validate experimental observations.