HKUEMS :: Event Details

Seminar: Mechanochromic Luminescent Materials for Multicolor Fluorescence Drawing and Sensing
posted by Department of Chemistry for HKU and Public
Event Type: Public Lecture/Forum/Seminar/Workshop/Conference/Symposium
Event Nature: Science & Technology

Event Details

Speaker: Prof. Jye-Shane Yang
Department of Chemistry, National Taiwan University

Mechanochromic luminescent (MCL) materials display fluorescence color change in response to mechanical forces, such as grinding, pressing, and shearing. Potential applications of MCL materials include sensors, rewritable optical displays, security printing, and data-storage devices. While many dichromatic MCL systems have been developed, multicolor counterparts that allow multicolor luminescence drawings or patterning are rare. Exciplexes are excited heterodimeric charge-transfer complexes that emit longer wavelength light than the individual components. In the solid state, exciplexes play an important role in contemporary development of white, blue, and infrared organic light-emitting devices (OLEDs). Regarding vapochromic luminescent (VCL) materials, which change the luminescence color in response to vapor stimuli, exciplex formation could be an effective strategy toward multicolor responses. However, examples of exciplexes formed between a solid host and a vapor guest are very limited. In this presentation, materials of combined MCL and exciplex-based VCL properties created by derivatization of the rigid bulky H-shaped pentiptycene scaffold will be illustrated by multicolor fluorescence drawings (one example is shown below) and differential sensing of a series of aniline vapors with a single chromophore on thin solid films.[1,2] The feature of force-induced fluorescence-color memory (MFM) and the opposite anti-MFM observed for these materials plays an important role in both performance of drawing and sensing. The structure-property relationship will be elucidated.

References
1. Matsunaga, Y.; Yang, J.-S. Angew. Chem. Int. Ed., 2015, 54, 7985-7989.
2. Yang, J.-S.; Yan, J.-L. Chem. Commun. 2008, 1501-1512.
3. Lin, C.-J.; Liu, Y.-H.; Peng, S.-M.; Shinmyozu, T.; Yang, J.-S. Inorg. Chem. 2017, 56, 4978-4989.

All are Welcome


Tea will be served at 5:45 p.m. in the Departmental Lobby on the G/F.,Chong Yuet Ming Chemistry Building

Date/Time14/09/2017 18:30-20:00
VenueLecture Theatre P1, CYM Chemistry Building
LanguageEnglish

Registration Instruction

Registration is not required.

Contact Information

Should you have any enquiries, please feel free to contact Lam Chak Fung Daniel by email at chdaniel@hku.hk