A stimuli-responsive and chemically tunable organic microcrystal laser switch
2019
Cai, Xin | Xu, Zhenzhen | Zheng, Xiaolin | Ran, Chenhui | Liu, Peng | He, Xianxiong | Jin, Xue | Liao, Qing | Fu, Hongbing
We demonstrated a stimuli-responsive and chemically switchable organic microbelt laser through reversible protonation–deprotonation reactions. The parent microbelt cavity together with the optically allowed 0–1 transition of H-aggregates enables a microlaser to operate at 585 nm. Upon HCl vapor treatment, the protonation of surface molecules shifts the lasing wavelength to 560 nm, generating an intensity contrast ratio >10⁵, accompanied by a sharp color change from orange (deprotonated) to green (protonated). When treated with HCl–NH₃ vapor, the protonation–deprotonation reactions lead to a reversible microlaser switch between 585 nm and 560 nm with good reproducibility and photostablity, making them attractive in high-throughput chemical and biological sensing applications.
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