Extreme γ-ray radiation hardness and high scintillation yield in perovskite nanocrystals

Ultrathin Light-Emitting Diodes with External Efficiency over 26% Based on Resurfaced Perovskite Nanocrystals

“…We highlight that the spectral position of the first excitonic absorption and luminescence peaks are essentially identical in the reference and CsPbBr 3 :NiO X PNCs samples, indicating that the electronic structure of the nanocrystal’s core is unaltered by the treatment, and that the bands alignment at the heterointerface does not cause exciton splitting, which is consistent with ∼1 monolayer thin NiO X coating. We finally notice that the PL spectrum of NiO X -treated PNCs is slightly blue-shifted with respect to the pristine PNCs, which is likely the consequence of the effective passivation of surface defect sites (likely halide vacancies) in agreement with recent literature. , …”

“…We finally notice that the PL spectrum of NiO X -treated PNCs is slightly blue-shifted with respect to the pristine PNCs, which is likely the consequence of the effective passivation of surface defect sites (likely halide vacancies) in agreement with recent literature. 11,90 We then proceeded with experimentally validating the potential of the ultrathin emissive layer approach by fabricating and testing planar devices with the architecture shown in Figure 1a embedding an ultrathin PNC emissive layer (d = 10 nm). The cross-sectional TEM image is reported in Figure 3a, showing a continuous film of CsPbBr 3 :NiO X PNCs with clear interfaces.…”

“…In the past few years, prized for their advantageous optical properties and affordable solution processability, lead halide perovskite nanocrystals (PNCs) have emerged as promising active materials in a wide range of photonic and optoelectronic technologies, spanning from photovoltaic cells, − lasers, , data communication, and radiation detectors − to luminescent solar concentrators , and artificial light sources. − Light-emitting diodes based on PNCs (PNC-LEDs) − have experienced a particularly steep growth, , owing to the efficient, spectrally tunable, narrow luminescence of PNCs and their defect-tolerant electronic structure. ,− Building upon these unique qualities of PNCs, extensive research in material design, morphology/interfacial control, surface chemistry, ,,,,− ,− and energy level engineering (via doping or alloying) ,, has been dedicated to understanding and suppressing detrimental surface defectsacting both as traps for electrically injected carriers and as nonradiative quenching centers for the resulting excitonic luminescenceand to devise suitable molecular ligands and solution-based protocols for fabricating high-quality, low-resistance PNC active layers. ,,,,,− These efforts have enabled researchers to incorporate PNCs with ∼100% photoluminescence (PL) quantum yield (Φ PL ) in devices featuring near-unity carrier mobility ratio (γ),…”

Exploring the Limits: Degradation Behavior of Lead Halide Perovskite Films under Exposure to Ultrahigh Doses of γ Rays of Up to 10 MGy

“…Single crystals of this material were reported to tolerate different doses of γ rays of up to 8 kGy, but their optical and electrical properties change after a cumulative dose of >25 kGy . However, very recently it has been reported that CsPbI 3 nanocrystals could tolerate an “extreme dose” of γ rays approaching 1 MGy …”

Gamma-Ray Irradiation Stability of Zero-Dimensional Cs3Cu2I5 Metal Halide Scintillator Single Crystals

“…25 Zaffalon et al demonstrated an exceptionally stable scintillation efficiency of both CsPbBr 3 and CsPbBr 3 :F nanocrystals under an accumulated dose of 1 MGy. 26 The radioluminescence efficiency of CsPbBr 3 :F nanocrystals could retain their initial value while the photoluminescence quantum yield (PLQY) decreased by ∼30%. They contributed the excellent stability to the self-healing ability of the structural defects created by irradiation which has been observed in different perovskite material systems.…”