研究目的
Investigating the mechanism of excited-state intramolecular proton transfer lasers and achieving near-infrared lasing at a record wavelength of 775 nm based on organic 1D single-crystal arrays.
研究成果
Room-temperature single-mode 775-nm lasing with a low lasing threshold is achieved from the nanowire arrays. The high-quality factor Q of ～2,340 demonstrates efficient optical feedback in the nanowires. Mode-tunable NIR lasing emission can be achieved by designing different sizes of organic nanowire arrays.
研究不足
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 an effective four-level energy system for population inversion.
1：Experimental Design and Method Selection:
The study involved the fabrication of organic single-crystal nanowire arrays based on an ESIPT-active organic small molecule. The dynamic intramolecular proton transfer process was verified using time-resolved femtosecond fluorescence upconversion transients and transient absorption techniques.
2：Sample Selection and Data Sources:
The organic molecule DMHC was synthesized via the Claisen-Schmidt condensation reaction. Organic nanowire arrays were prepared by a capillary-bridge confined assembly method.
3：List of Experimental Equipment and Materials:
A Pharos femtosecond laser system, Orpheus-HP optical parameter amplifier, HARPIA-TF system, and a grating spectrometer (Princeton Instruments; ARC-SP-2356) were used.
4：Experimental Procedures and Operational Workflow:
The DMHC solution was dropped onto a substrate and covered by an asymmetric-wettability micropillar template. The liquid film ruptured as organic solvents evaporated, leading to the formation of capillary bridges and subsequently organic single-crystal nanowire arrays.
5：Data Analysis Methods:
The PL spectra were tested by a homemade micro-photoluminescence system. The intensity and full-width-half-maximum of the emission peaks were analyzed to determine the lasing threshold and quality factor.
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