Citation: Guanghui Wang, Zifei Wang, Bingbing Ding, Xiang Ma. pH-Responsive amorphous room-temperature phosphorescence polymer featuring delayed fluorescence based on fluorescein[J]. Chinese Chemical Letters, ;2021, 32(10): 3039-3042. doi: 10.1016/j.cclet.2021.03.054 shu

pH-Responsive amorphous room-temperature phosphorescence polymer featuring delayed fluorescence based on fluorescein

Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China

bbding@ecust.edu.cn

maxiang@ecust.edu.cn

Received Date: 8 February 2021
Revised Date: 22 March 2021
Accepted Date: 23 March 2021
Available Online: 23 March 2021

Figures(6)

Numerous researchers have paid attention to achieve metal-free phosphorescence by exploring new structures or new mechanisms. Herein, a facile way is introduced to endow a common fluorescence dye, tetrabromofluorescein (4Br-Flu), some fabulous optical characteristics such as dual emission including thermally activated delayed fluorescence, room-temperature phosphorescence (RTP), and the excellent pH-sensitivity. Shortly, 4Br-Flu with good light-emitting properties is composed into the polymer system. The multiple bromine atoms promote the spin-orbit coupling effect and facilitate triplet excitation. Especially, the hydrogen bonding network of the polymer restricts the molecular motion of 4Br-Flu so that the system can emit long-wavelength RTP when 4Br-Flu is doped into polyvinyl alcohol or co-polymerized with acrylamide. Due to the reversible transformation of protonation and deprotonation, the 4Br-Flu based polymer responded to acid and alkali like a phosphorescent switch which makes it an excellent hydrogen chloride/ammonia gas leak detector in dry environment.
- Room temperature phosphorescence,
- pH-Response,
- Amorphous,
- Fluorescein,
- Thermally activated delayed fluorescence
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