Enhancing photoluminescence quantum yield and excellent
transport
associated with molecular order are important for advancing organic
laser device performance. However, materials combining excellent quantum
yield and transport are rare. 4,4′-Bis[(N-carbazole)styryl]biphenyl
(BSB-Cz) has been heavily investigated as a promising material for
laser devices. However, research on highly ordered BSB-Cz crystalline
films is lacking, despite the much better transport properties to
be expected. Here, we show that BSB-Cz thin-film crystals can be prepared
using a simple vacuum deposition method, followed by thermal annealing.
The resulting crystalline neat BSB-Cz thin films show a very high
photoluminescence quantum yield of over 85% and superior optical stability
compared to amorphous BSB-Cz films under intense pumping conditions.
We believe that our work provides a route for advancing organic laser
devices through introducing crystallinity in emitter thin films with
a scalable approach.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.