Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 8, Issue 17, Pages 4191-4196Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b01796
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Funding
- National Natural Science Foundation of China [21673100, 91227202]
- Chang Jiang Scholars Program [T2016051]
- Changbai Mountain Scholars Program [2013007]
- Jilin Provincial Science & Technology Development Program [20150520087JH]
- Chinese Academy of Sciences [KJCX2-SW-N20, KJCX2-SW-N03]
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Pressure-induced emission enhancement (PIEE), a novel phenomenon in the enhancement of the solid-state emission efficiency of fluorophores, has been arousing wide attention in recent years. However, research on PIEE is still in the early stage. To further pursue more enhanced efficiency, discovering and designing more PIEE systems would be urgently desirable and of great importance. In this Letter, we found that carbazole presented a conspicuous emission enhancement under high pressure up to 1.0 GPa. In situ high-pressure infrared spectroscopy and angle-dispersive X-ray diffraction analysis combined with Hirshfeld surface theory calculation indicated that the PIEE of carbazole was attributed to the decrease of the nonradiation vibration process. This phenomenon mainly resulted from restriction of the N-H stretching vibration by increased N-H center dot center dot center dot pi interactions under high pressure. Our study puts forward a mechanism of PIEE related to the restriction of intramolecular vibration, which provided deep insight into the essential role of intermolecular interaction in fluorescence emission properties.
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