Organic microlasers hold great potentials in fabricating on-chip sensors for integrated photonic circuits due to their chemical versatility and reactivity. However, chemical vapor detection is still challenging for organic microlaser sensors, as it requires not only optical gain and self-assembly capability, but also rapid response to stimuli and long-term stability under high excitation power. In this work, a new laser dye 4,7-bis(9-octyl-7-(4-(octyloxy)phenyl)-9H-carbazol-2-yl)benzo[c][1,2,5]thiadiazole (BPCBT) is designed and synthesized, which self-assembles into microwires showing strong intramolecular charge transfer (ICT) photoluminescence with >80% quantum efficiency. It enables the lasing from BPCBT microwires under a low threshold of 16 μJ·mm⁻²·pulse⁻¹ with significantly improved stability over conventional organic microlasers. The stimulated emission amplifies the fluorescence change in the BPCBT microwires under chemical vapors including various acid, acetone, and ethanol vapors, indicating high sensitivity and high selectivity of organic microlaser sensors desirable for compact sensor arrays in integrated photonics.

由于其化学多功能性和反应性，有机微激光器在制造集成光子电路片上传感器方面具有巨大潜力。然而，化学蒸气检测对于有机微激光传感器仍然具有挑战性，因为它不仅需要光学增益和自组装能力，还需要对刺激的快速响应和高激发功率下的长期稳定性。在这项工作中，一种新的激光染料4,7-双(9-辛基-7-(4-(辛氧基)苯基)-9H-咔唑-2-基)苯并[c][1,2,5]噻二唑( BPCBT）经过设计和合成，可自组装成微线，表现出强分子内电荷转移（ICT）光致发光，量子效率为>80%。它能够在 16 μJ·mm ^-2 ·pulse ^-1的低阈值下从 BPCBT 微线发射激光，并且与传统有机微激光器相比，稳定性显着提高。受激发射放大了 BPCBT 微线在化学蒸汽（包括各种酸、丙酮和乙醇蒸汽）下的荧光变化，表明有机微激光传感器具有高灵敏度和高选择性，是集成光子学中紧凑传感器阵列所需要的。