Recently, Professor Xiang Ma's team from the School of Chemistry and Molecular Engineering at East China University of Science and Technology has made new advances in the research of tunable-lifetime room-temperature phosphorescent materials, providing a simple strategy for developing wide-range tunable-lifetime and highly efficient deep blue room-temperature phosphorescent materials. The relevant findings have been published in "Applied Chemistry Germany".
Efficient room-temperature phosphorescence is widely used in bioimaging, optoelectronic information displays, sensors, and anti-counterfeiting applications due to its large Stokes shift and high signal-to-noise ratio effect. Currently, achieving tunable-lifetime and highly efficient deep blue room-temperature phosphorescent materials still presents certain challenges.
The research team achieved wide-range tunable-lifetime and highly efficient deep blue room-temperature phosphorescent materials by doping derivatives of methyl benzoate into a polyvinyl alcohol matrix. Experimental results show that as the electron-donating ability of the para-substituents of methyl benzoate increases, the phosphorescence lifetime of the doped film can be increased from 32.8 ms to 1925.8 ms. Phosphorescent emissions of 4-hydroxy methyl benzoate, 4-amino methyl benzoate, and 4-aminomethyl methyl benzoate doped films are in the deep blue region, with a highest phosphorescence quantum yield of up to 15.4%.
The construction strategy for efficient and tunable-lifetime deep-blue room-temperature phosphorescent materials is depicted. Image source: German Applied Chemistry.
In another study published in Nature Communications, the team led by Xiang Ma (East China University of Science and Technology as the third completion unit) and collaborators made progress in the field of organic phosphorescence. The research team selected the rigid molecule 9H-dibenzo[a,c]cycloocta[1,2-b:5,6-b']di[1,4]oxazepine (BCZ) with an almost completely planar structure as the guest molecule. Polyvinylpyrrolidone (PVP) with a rigid structure and a high glass transition temperature was chosen as the host matrix to obtain the dual-rigid-doping material BCZ/PVP. This material exhibits a 40-second afterglow at 293 K and a clear afterglow of 1 second at 433 K.
Synthetic Strategy for Organic High-Temperature Phosphorescent Materials. Image source: Nature Communications.
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