Near-infrared (NIR) solid-state lasers (SSLs) have advanced telecommunication, spectroscopy, and medical diagnosis. However, the development of organic NIR SSLs still faces severe challenges due to the low stimulated emission of narrow-band-gap molecules and the lack of the effective four-level energy system for population inversion. Here, we fabricated organic single-crystal nanowire arrays based on an excited-state intramolecular proton transfer (ESIPT)-active organic small molecule. The dynamic intramolecular proton transfer within ∼2.5 ps verified the establishment of the four-level energy system. Consequently, room-temperature single-mode 775-nm lasing with a low lasing threshold P_th of 9.9 μJ cm⁻² is achieved from the nanowire arrays with the length of L = 10 μm. Our work gives the unambiguous demonstration of the mechanism of ESIPT lasers and the first realization of organic nanolaser arrays over 760 nm, which will boost the practical application of integrated organic coherent light sources at near-infrared wavelength.

近红外（NIR）固态激光器（SSL）具有先进的电信，光谱学和医学诊断能力。然而，由于窄带隙分子的低受激发射和缺乏有效的四能级能量反演系统，有机NIR SSLs的开发仍面临严峻挑战。在这里，我们基于激发态分子内质子转移（ESIPT）活性有机小分子制造了有机单晶纳米线阵列。约2.5 ps内的动态分子内质子转移证明了四能级能量系统的建立。因此，从纳米线阵列获得了室温单模775nm激光，激光阈值P _th为9.9μJcm ^-2。L  ＝10μm。我们的工作清楚地展示了ESIPT激光器的机理，并首次实现了760 nm以上的有机纳米激光阵列，这将促进集成有机相干光源在近红外波长的实际应用。