【摘 要】
：
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 charact
【机 构】
：
Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center,School
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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.
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