ORCID Profile
0000-0001-9943-5677
Current Organisation
Harbin Institute of Technology (Shenzhen)
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Publisher: American Chemical Society (ACS)
Date: 16-06-2019
DOI: 10.1021/JACS.9B04426
Abstract: Many aggregation-induced emission (AIE) materials are featured by the diphenylethene (DPE) moiety which exhibits rich photophysical and photochemical activities. The understanding of these activities behind AIE is essential to guide the design of fluorescent materials with improved performance. Herein by fusing a flexible DPE with a rigid spiro scaffold, we report a class of novel deep-blue material with solid-state fluorescent quantum yield (Φ
Publisher: Springer Science and Business Media LLC
Date: 08-04-2019
DOI: 10.1038/S41467-019-09561-8
Abstract: Persistent luminescence is a fascinating phenomenon with exceptional applications. However, the development of organic materials capable of persistent luminescence, such as organic persistent room-temperature phosphorescence, lags behind for their normally low efficiency. Moreover, enhancing the phosphorescence efficiency of organic luminophores often results in short lifetime, which sets an irreconcilable obstacle. Here we report a strategy to boost the efficiency of phosphorescence by intramolecular triplet-triplet energy transfer. Incorpotation of (bromo)dibenzofuran or (bromo)dibenzothiophene to carbazole has boosted the intersystem crossing and provided an intramolecular triplet-state bridge to offer a near quantitative exothermic triplet–triplet energy transfer to repopulate the lowest triplet-state of carbazole. All these factors work together to contribute the efficient phosphorescence. The generation and transfer of triplet excitons within a single molecule is revealed by low-temperature spectra, energy level and lifetime investigations. The strategy developed here will enable the development of efficient phosphorescent materials for potential high-tech applications.
Publisher: Wiley
Date: 22-10-2019
Abstract: Herein the novel tetraphenylethylene (TPE) derivative 1 was designed with an integration of aggregation-induced emission (AIE), multi-state mechanochromism and self-recovery photochromism. The molecule was susceptible to grinding, heating and vapor fuming and showed corresponding transition of its emission colors. The heated powder or single crystal of 1 exhibited reversible photochromism. After a short period of UV irradiation, it showed a bright red color, but recovered to its original white appearance within 1 min. The photochromism is due to the formation of photocyclization intermediates upon UV irradiation, while the eversible mechanochromism is attributed to the weak molecular interactions derived from head-to-tail stacking of the molecules. This reversible multi-state, high-contrasted and rapid responsive mechanochromic and photochromic property cooperatively provide double enhancement of a multimode guarantee in advanced anti-counterfeiting.
Publisher: Wiley
Date: 03-12-2020
Publisher: American Chemical Society (ACS)
Date: 19-03-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7SC01054K
Abstract: For the first time, an AIEgen-conjugated monoclonal antibody is designed for “turn-on” and “wash-free” imaging of EGFR-overexpressed cancer cells.
Publisher: Wiley
Date: 22-04-2020
Publisher: Wiley
Date: 15-07-2019
Publisher: Research Square Platform LLC
Date: 08-08-2023
DOI: 10.21203/RS.3.RS-3198725/V1
Abstract: Anti-Kasha’s emission in organic luminogens has attracted many attentions since its discovery. However, only limited ex les of anti-Kasha rule have been reported and anti-Kasha triplet energy transfer (ET) is even less-touched. This work provided an efficient strategy to realize excitation wavelength dependent (Ex-De) afterglow in a host-guest system benefiting from anti-Kasha rule. Host has almost imperceptible RTP upon 365 nm excitation and guest is totally RTP inactive, while the doping system exhibits Ex-De afterglow with improved quantum yields. Anti-Kasha triplet ET process is demonstrated from the higher excited triplet state T 2 of host to the lowest excited singlet state S 1 of the aggregated/unimolecular state of guest . ET efficiency in the doping system could be tuned by adopting denser or looser intermolecular packing through simply changing processing methods. The strategy of anti-Kasha triplet ET endows doping system with multiple stimuli-responsive properties, including Ex-De afterglow, mechano- and thermal-triggered afterglow behavior. Corresponding applications are also realized in multiple information anti-counterfeiting and display.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 11-01-2023
Abstract: Cells are responsive to the mechanical environment, but the methods to detect simultaneously how different organelles react in mechanobiological processes remain largely unexplored. We herein report a dual organelle-targeting fluorescent probe, ( E )-1-[3-(diethoxyphosphoryl)propyl]-4-[4-(diethylamino)styryl]pyridin-1-ium bromide (ASP-PE), for mechanical mapping in live cells. ASP-PE is aggregation-induced emission active and is sensitive to the local mechanical environment. It targets the plasma membrane (PM) and intracellular mitochondria in cells by its phosphonate moiety and pyridinium. In this work, through ASP-PE staining, changes of membrane tension in the PM and mitochondria in response to varied osmotic pressure and substrate stiffness are visualized using fluorescence lifetime imaging microscopy. The mechanobiological importance of actin filaments and microtubules in the PM and mitochondria is also investigated using this probe. Computational simulations are applied to study the sensing mechanism of the probe. This study introduces a unique tool for mapping the membrane tension in the PM and mitochondria together, providing us great opportunities to study organelle’s interactions in mechanobiology.
Publisher: Springer Science and Business Media LLC
Date: 06-07-2022
DOI: 10.1038/S41467-022-31481-3
Abstract: The development of smart-responsive materials, in particular those with non-invasive, rapid responsive phosphorescence, is highly desirable but has rarely been described. Herein, we designed and prepared a series of molecular rotors containing a triazine core and three bromobiphenyl units: o -Br-TRZ, m -Br-TRZ, and p -Br-TRZ. The bromine and triazine moieties serve as room temperature phosphorescence-active units, and the bromobiphenyl units serve as rotors to drive intramolecular rotation. When irradiated with strong ultraviolet photoirradiation, intramolecular rotations of o -Br-TRZ, m -Br-TRZ, and p -Br-TRZ increase, successively resulting in a photothermal effect via molecular motions. Impressively, the photothermal temperature attained by p -Br-TRZ is as high as 102 °C, and synchronously triggers its phosphorescence due to the ordered molecular arrangement after molecular motion. The thermal effect is expected to be important for triggering efficient phosphorescence, and the photon input for providing a precise and non-invasive stimulus. Such sequential photo-thermo-phosphorescence conversion is anticipated to unlock a new stimulus-responsive phosphorescence material without chemicals invasion.
Publisher: Wiley
Date: 22-10-2019
Publisher: Springer Science and Business Media LLC
Date: 18-08-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CC00122H
Abstract: Star: a pentagonal conjugated radialene macrocycle was one-pot synthesized for the first time. The fantastic pentagonal architecture is revealed by its single crystal structure, and affords the smallest ring strain and the best conjugation.
No related grants have been discovered for Zikai HE.