Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41563-020-0797-2
Title: Carbazole isomers induce ultralong organic phosphorescence
Authors: Chen, Chengjian 
Chi, Zhenguo
Chong, Kok Chan 
Batsanov, Andrei S
Yang, Zhan
Mao, Zhu
Yang, Zhiyong 
Liu, Bin 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Materials Science
Physics
ROOM-TEMPERATURE PHOSPHORESCENCE
LIGHT-EMITTING-DIODES
Issue Date: 2020
Publisher: NATURE RESEARCH
Citation: Chen, Chengjian, Chi, Zhenguo, Chong, Kok Chan, Batsanov, Andrei S, Yang, Zhan, Mao, Zhu, Yang, Zhiyong, Liu, Bin (2020). Carbazole isomers induce ultralong organic phosphorescence. NATURE MATERIALS 20 (2) : 175-180. ScholarBank@NUS Repository. https://doi.org/10.1038/s41563-020-0797-2
Abstract: Commercial carbazole has been widely used to synthesize organic functional materials that have led to recent breakthroughs in ultralong organic phosphorescence , thermally activated delayed fluorescence , organic luminescent radicals and organic semiconductor lasers . However, the impact of low-concentration isomeric impurities present within commercial batches on the properties of the synthesized molecules requires further analysis. Here, we have synthesized highly pure carbazole and observed that its fluorescence is blueshifted by 54 nm with respect to commercial samples and its room-temperature ultralong phosphorescence almost disappears . We discover that such differences are due to the presence of a carbazole isomeric impurity in commercial carbazole sources, with concentrations <0.5 mol%. Ten representative carbazole derivatives synthesized from the highly pure carbazole failed to show the ultralong phosphorescence reported in the literature . However, the phosphorescence was recovered by adding 0.1 mol% isomers, which act as charge traps. Investigating the role of the isomers may therefore provide alternative insights into the mechanisms behind ultralong organic phosphorescence . 1 2,3 4 5 6 1,7–15 1,6–18
Source Title: NATURE MATERIALS
URI: https://scholarbank.nus.edu.sg/handle/10635/188540
ISSN: 14761122
14764660
DOI: 10.1038/s41563-020-0797-2
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