Crystallization‐Induced Emission Enhancement and Amplified Spontaneous Emission from a CF3‐Containing Excited‐State Intramolecular‐Proton‐Transfer Molecule
Source abstract
Abstract
In this work, a simple but effective molecular design strategy is developed for the generation of intense blue emission in the solid state including single crystals through the multiple secondary intermolecular interactions such as CF…HC hydrogen bonding. The synthesized novel imidazole‐based excited‐state intramolecular proton transfer (ESIPT) molecule, 2‐(1‐(3,5‐bis(trifluoromethyl)phenyl)‐4,5‐diphenyl‐1H‐imidazol‐2‐yl)phenol (HPI‐CF3), shows significantly enhanced blue fluorescence in single crystal (ΦF = 0.67) compared to faint emission in solution (ΦF < 0.05). It is considered that tight but slipped stacking structure of HPI‐CF3 molecules in the single crystal not only effectively suppresses the nonradiative decay pathways such as twist intramolecular charge transfer but also induces highly allowed transition character. Taking advantage of the crystallization‐induced emission enhancement characteristics and four‐level ESIPT photocycle process of HPI‐CF3, an efficient amplified spontaneous emission at 475 nm with a threshold of 13.1 mJ cm−2 is observed from the single crystal by picosecond laser optical pumping.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Luminescence and Fluorescent Materials · Porphyrin and Phthalocyanine Chemistry · Organic Light-Emitting Diodes Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry Kongju National University 56 Gongjudaehak‐ro Gongju Chungnam 32588 Republic of Korea
Center for Supramolecular Optoelectronic Materials (CSOM) Department of Materials Science and Engineering Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of Korea
Center for Soft and Living Matter Institute for Basic Science 50 UNIST‐gil Ulsan 44919 Republic of Korea
Ultrafast Laser Spectroscopy and Nano‐microscopy (ULSaN Lab) Department of Chemistry School of Natural Science Ulsan National Institute of Science and Technology (UNIST) 50 UNIST‐gil Ulsan 44919 Republic of Korea
Nanostructures Fabrication Laboratory Department of Chemistry Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of Korea
Madrid Institute for Advanced Studies IMDEA in Nanoscience C/Faraday, 9, Ciudad Universitaria de Cantoblanco 28049 Madrid Spain
Funding
National Research Foundation of Korea · Ministerio de Economía y Competitividad
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