Sentences with phrase «triplet exciton»
Researchers from North Carolina State University have demonstrated the transfer of triplet exciton energy from semiconductor nanocrystals to surface - bound molecular acceptors, extending the lifetime...
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«When we looked at triplet exciton transfers from nanomaterials to molecules, we noticed that after the initial transfer the nanomaterial would still luminesce in a delayed fashion, which was unexpected,» says Castellano.
David Lidzey, a professor of physics and astronomy at the University of Sheffield who was not involved in this work, calls the research «a really impressive demonstration of a direct measurement of the diffusion of triplet excitons and their eventual trapping.»
In a new contribution, Castellano and Cédric Mongin, a former postdoctoral researcher currently an assistant professor at École normale supérieure Paris - Saclay in France, have shown that not only does the transfer of triplet excitons extend excited state lifetimes, but also that some of the energy gets returned to the original nanomaterial in the process.
Researchers from North Carolina State University have found that the transfer of triplet excitons from nanomaterials to molecules also creates a feedback mechanism that returns some energy to the nanocrystal, causing it to photoluminesce on long time scales.
In these images, the initial spin - singlet exciton state (left), which features electron - hole pairs, splits into a pair of spin - triplet excitons (right).