A novel metal-free amorphous room-temperature phosphorescent polymer without conjugation
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Room-temperature phosphorescence (RTP) has attracted much attention due to its potential applications in the fields of biological imaging, chemical sensors and so forth. Particularly, amorphous metal-free RTP materials show special advantages of low cost and good processability. In addition, non-conjugated polymers have seldom been reported as phosphorescent materials. In this work, a novel non-conjugated amorphous metal-free copolymer composed of brominated olefins and acrylamide was prepared in a facile way, which could engender blue-purple RTP emission. Polymers with different kinds of brominated olefins and different ratios of two monomers have been investigated with the purpose of researching the composition/property relationship that may affect the RTP properties. This unique phenomenon could be due to the clustering of carbonyl and amino units caused molecular interaction, and the heavy-atom effect enhanced intersystem crossing. Meantime, the hydrogen bonding in the system enhanced the conformation rigidification to reduce the non-radiative decay. This work provided a delicate way to construct non-conjugated metal-free RTP materials and supplied a new insight into the development of RTP materials.
Keywordsroom-temperature phosphorescence non-conjugation amorphous metal-free system
This work was supported by the National Natural Science Foundation of China (21788102, 21722603, 21476075), Programme of Introducing Talents of Discipline to Universities (B1607), and the Innovation Program of Shanghai Municipal Education Commission and the Fundamental Research Funds for the Central Universities. Prof. Yujian Zhang from Huzhou University was also be grateful for helping test the quantum yields.
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