Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 41, Pages 38226-38231Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10189
Keywords
NIR microlaser; spiropyrane; tetraphenylethylene twisted conformation; enhanced quantum yield; self-assembled microsphercial cap
Funding
- National Natural Science Foundation of China [21774007, 21574009, 21790364]
- Fundamental Research Funds for the Central Universities [ZY1906]
- Research projects on biomedical transformation of China-Japan Friendship Hospital [PYBZ1822]
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Near-infrared (NIR) microlasers play a significant role in telecommunication and biomedical tissue imaging. However, it remains a big challenge to realize NIR microlasers because of the difficulty in preparing highly efficient NIR luminescent materials and perfect optical resonators. Here, we propose a molecular design strategy to creatively realize the first spiropyrane (SP)-based NIR microlasers with low threshold from self-assembled microsphercial caps. The tetraphenylethylene (TPE) moiety with a highly twisted conformation provides a large free volume to facilitate the photoisomerization process of SP and enhance NIR emission of merocyanine in the solid state. Moreover, self-assembled TPE SP microsphercial caps simultaneously serve as gain media and resonant microcavities, providing optical gain and feedback for NIR laser oscillations with a low threshold (3.68 mu J/cm(2)). These results are beneficial for deeply understanding the SP microstructures-lasing emission characteristic relationship and provide a useful guideline for the rational molecular design of NIR microlasers with special functionalities.
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