A team of researchers from Lithuania has developed organic dyes
showing a particularly long afterglow after being excited by light.

Doping a polymer with newly synthesized diboraanthracene dyes resulted in an intense red or blue–green dual afterglow, which was composed of persistent thermally activated delayed fluorescence and long phosphorescence at room temperature, the team reports in the journal Angewandte Chemie.

Such organic materials can find important optoelectronic
applications, such as in data encryption, information recording, and

“When you try to develop materials with a more efficient
phosphorescence, the problem is that a more intensive phosphorescence
often results in the decrease of phosphorescence lifetime and vice
versa,” says Justina Jovaišaitė from Vilnius University (Lithuania), the
corresponding author of the study. To overcome this problem, the team
developed diboraanthracene dyes, for which the efficiency of
long-lasting phosphorescence was supplemented by the efficiency of persistent thermally activated delayed fluorescence.

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