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Updated: Jul 10, 2026

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
Understanding the pressure-induced emission enhancement for triple fluorescent compound with excited-state
Shayu Li1, Qian Wang, Yan Qian
1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China.
Abstract:
An organic compound, N-salicylidene-3-hydroxy-4-(benzo[d]thiazol-2-yl)phenylamine, with two intramolecular hydrogen bonding and triple fluorescence bands has been synthesized. With increasing pressure, enhanced emission of the triple fluorescence has been observed in succession. Within the pressure region up to 54.2 kbar, the luminescence of the SalHBP solution changed gradually from blue to cyan, until it became almost white. The three bands were assigned to the emission from the enol-enol, keto-enol, and enol-keto excited states of the molecules. The mechanism of the pressure-induced emission enhancement (PIEE) has been investigated with the aid of photophysical measurements and theoretical calculations. The results indicated that the PIEE phenomenon was significantly dependent on factors of hydrogen bond, viscosity, and molecular free volume.
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