ORCID Profile
0000-0003-3949-9622
Current Organisation
Hong Kong University of Science and Technology
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Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8SC02810A
Abstract: This work provides a new strategy to design heterocycle-containing AIEgens from non-emissive heteroaromatics and promotes their applications for long-term lysosome imaging.
Publisher: American Chemical Society (ACS)
Date: 20-01-2022
DOI: 10.1021/JACS.1C11480
Abstract: Long-persistent luminescence (LPL), also known as afterglow, is a phenomenon in which the material shows long-lasting luminescence after the cessation of the excitation source. The research of LPL continues to attract much interest due to its fundamental nature and its potential in the development of the next generation of functional materials. However, most of the current LPL materials are multicomponent inorganic systems obtained after harsh synthetic procedures and often use rare-earth metals. Recently, metal free organic long-persistent luminescence (OLPL) has gained much interest because it can bypass many of the disadvantages of inorganic systems. To date, the most successful method to generate OLPL systems is to access charge-separated states through binary donor-acceptor exciplex systems. However, it has been reported that the ratios of the binary systems affect OLPL properties, complicating the reproducibility and large-scale production of OLPL materials. Simpler OLPL systems can overcome these issues for the benefit of the development and adoption of OLPL systems. Here, we report on the rational design and synthesis of a single-component OLPL system with detectable afterglow for at least 12 min under ambient conditions. This work exemplifies an easy design principle for new OLPL materials. The investigation of the material provides valuable insights toward the generation of OLPL from a single-component system.
Publisher: Wiley
Date: 25-09-2017
Abstract: The detection of food spoilage is a major concern in food safety as large amounts of food are transported globally. Direct analysis of food s les is often time-consuming and requires expensive analytical instrumentation. A much simpler and more cost-effective method for monitoring food fermentation is to detect biogenic amines generated as a by-product during food decomposition. In this work, a series of 1,2-dihydroquinoxaline derivatives (DQs) with aggregation-induced emission (AIE) characteristics were synthesised and their protonated forms, that is, H
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6SC05192H
Abstract: Crystallization induced S⋯S interactions leading to an unusual luminescent phenomenon.
Publisher: Wiley
Date: 22-04-2020
Publisher: American Chemical Society (ACS)
Date: 03-11-2017
DOI: 10.1021/JACS.7B08592
Abstract: π-Bonds connected with aromatic rings were generally believed as the standard structures for constructing highly efficient fluorophores. Materials without these typical structures, however, exhibited only low fluorescence quantum yields and emitted in the ultraviolet spectral region. In this work, three molecules, namely bis(2,4,5-trimethylphenyl)methane, 1,1,2,2-tetrakis(2,4,5-trimethylphenyl)ethane, and 1,1,2,2-tetraphenylethane, with nonconjugated structures and isolated phenyl rings were synthesized and their photophysical properties were systematically investigated. Interestingly, the emission spectra of these three molecules could be well extended to 600 nm with high solid-state quantum yields of up to 70%. Experimental and theoretical analyses proved that intramolecular through-space conjugation between the "isolated" phenyl rings played an important role for this abnormal phenomenon.
Publisher: Wiley
Date: 17-01-2018
Publisher: American Chemical Society (ACS)
Date: 09-04-2018
DOI: 10.1021/JACS.8B01991
Abstract: Heterocyclic polymers have gained enormous attention for their unique functionalities and wide applications. In contrast with the well-studied polymer systems with five- or six-membered heterocycles, functional polymers with readily openable small-ring heterocycles have rarely been explored due to their large synthetic difficulty. Herein, a facile one-pot multicomponent polymerization to such polymers is developed. A series of functional polymers with multisubstituted and heteroatom-rich azetidine frameworks are efficiently generated at room temperature in high atom economy from handy monomers. The four-membered azetidine rings in the polymer skeletons can be easily transformed into amide and amidine moieties via a fast and efficient acid-mediated ring-opening reaction, producing brand-new polymeric materials with distinctive properties. All the as-prepared azetidine-containing polymers exhibit intrinsic visible luminescence in the solid state under long-wavelength UV irradiation even without conventionally conjugated structures. Such unconventional luminescence is attributed to the clusteroluminogens formed by through-space electronic interactions of heteroatoms and phenyl rings. All the obtained polymers show excellent optical transparency, high and tunable refractive indices, low optical dispersions and good photopatternability, which make them promising materials in various advanced electronic and optoelectronic devices. The ring-opened polymers can also function as a lysosome-specific fluorescent probe in biological imaging.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4CC07911F
Abstract: Fluorescent probe, TPE-TPP, can differentiate monomeric, oligomeric and fibrillar α-synuclein which was previously difficult to achieve.
No related grants have been discovered for Nelson Leung.