Using mesoporous
SiO
2
to encapsulate CsPbBr
3
nanocrystals is
one of the best strategies to exploit such materials
in devices. However, the CsPbBr
3
/SiO
2
composites
produced so far do not exhibit strong photoluminescence emission and,
simultaneously, high stability against heat and water. We demonstrate
a molten-salts-based approach delivering CsPbBr
3
/mesoporous-SiO
2
composites with high PLQY (89 ± 10%) and high stability
against heat, water, and aqua regia. The molten salts enable the formation
of perovskite nanocrystals and other inorganic salts (KNO
3
–NaNO
3
–KBr) inside silica and the sealing
of SiO
2
pores at temperatures as low as 350 °C, representing
an important technological advancement (analogous sealing was observed
only above 700 °C in previous reports). Our CsPbBr
3
/mesoporous-SiO
2
composites are attractive for different
applications: as a proof-of-concept, we prepared a white-light emitting
diode exhibiting a correlated color temperature of 7692K. Our composites
are also stable after immersion in saline water at high temperatures
(a typical underground environment of oil wells), therefore holding
promise as oil tracers.
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.