Recently,
metal halide perovskite scintillators have
demonstrated
high potential applications in X-ray detection. Notably, perovskite
scintillators usually suffer from serious self-absorption, severely
affecting their scintillation performance and practical application.
Here, we explore the scintillation properties of perovskite CsPbBr3 nanowires (NWs) and further propose an energy transfer (ET)
strategy from perovskite NWs to commercial organic dyes to eliminate
perovskites’ self-absorption. This ET strategy can effectively
improve the perovskite scintillator’s performance: it brings
a 60 nm red-shift radioluminescence (RL) with a faster RL recombination
rate. More importantly, such an ET process also contributes a low
detection limit of 152 nGy/s, a superior spatial resolution of about
11.5 lp mm–1, and an optical yield up to about 4.1
times compared with pure perovskite NWs scintillators. When applying
multiple ET processes, the RL of the perovskite/dyes scintillator
can be further shifted ∼130 nm to the red light region for
achieving a red scintillator screen, overcoming the instability problem
of the present perovskite-based red scintillator. In addition, the
composite scintillator also demonstrated good radiation stability,
excellent flexibility, and resistance to bending damage. Our finding
has proposed an effective ET strategy with scientific and technological
importance for developing reabsorption-free and performance-effective
perovskite scintillators.