The CsPbBr3 nanocrystal
is a highly attractive
light
emitter with outstanding monochromaticity and good thermal stability
and has garnered tremendous interest in its application in luminescent
materials and devices. Here, we propose a novel strategy to improve
the luminescence intensity of CsPbBr3 nanocrystals by doping
with Nd3+ ions and introducing pressure. Under high pressure,
the CsPbBr3:Nd nanocrystals show an abnormal enhancement
of the photoluminescence intensity from 0.19 to 0.34 GPa. The time-resolved
photoluminescence measurements reveal that pressure facilitates the
recombination of self-trapped excitons and suppresses the recombination
of the Nd energy levels. This discovery shows that pressure can modulate
the photoluminescence kinetics of CsPbBr3:Nd nanocrystals.
This work deepens the understanding of the influence of high pressure
on rare-earth-doped luminescent materials and provides insight to
improve the capabilities of optical devices.
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