Abstract
Charged-particle induced radioluminescence (RL) of CsPbBr3 (CPB) perovskite quantum dots (QD) in their clustered state was investigated using α-particles from a radiation source. The RL response was analyzed with photomultiplier tubes (PMT) combined with the pulse-digitization technique, which enabled the evaluation of time-resolved waveforms for individual α-radiation events. The rising and decay transition times of electric pulses were found very close to the instrumental limitation, while orders of magnitude shorter than typically measured in conventional inorganic scintillators. Based on the statistical analysis of timing characteristics, our study assessed the potentials of employing perovskite nanomaterials in precise timing applications as demonstrated in a comparative measurement with a CsI(Tl) scintillator. The distribution of pulse charge was converted to luminescence intensities, which were fitted with Monte Carlo simulations giving an estimate of 2.95 photon/keV for the RL yield and 29.2% for detection efficiency (DE), referring to our mean cluster thickness of 5 QD layers.
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