Low-dimensional perovskite materials and their derivatives with excellent optical performance are promising candidates for light-emission applications. Herein, centimeter lead-halide Cs4PbBr6 single crystals (SCs), which have been used for radiation detection with the indirect conversion method, were synthesized by a facile solution process. The Cs4PbBr6 scintillator exhibits bright green emission peaking at 525 nm and a high photoluminescence quantum yield (up to 86.7%) under 375 nm laser excitation. The Cs4PbBr6 SCs exhibit high sensitivity to 40 keV X-rays, with a favorable linearity with the X-ray exposure dose rate, and the detection limit is as low as 64.4 nGyair/s. The scintillation time-response performance of the Cs4PbBr6 SCs was acquired by a time-correlated single-photon counting system under alpha-particle excitation. The Cs4PbBr6 SCs exhibit a very fast time response (τav = 1.46 ns) to alpha particles from a 241Am radiation source. This value is comparable to that of the commercial plastic scintillator EJ-228 (τav = 1.31 ns) and much faster than that of the LYSO(Ce) scintillator (τav = 36.17 ns). Conceptual X-ray imaging and alpha-particle pulse height spectroscopy experiments were also performed. These results demonstrated the potential of Cs4PbBr6 SCs for radiation detection applications, including X-ray imaging and charged particle detection with fast scintillation decay time and high sensitivity.

Low-cost solution-processed scintillation radiation detection materials are pursued urgently in ionization applications. Scintillators are key conversion materials that absorb high-energy X(γ) photons and convert them into UV−visible photons. Bulk mix organic−inorganic hybrid perovskites (CH 3 NH 3 PbCl 3−X Br X ) have been employed to detect X(γ) photons using a photon−photon conversion method. Optical properties were carefully investigated by photoluminescence (PL) spectra, PL lifetime, and X-ray excited luminescence (XEL) spectra at room temperature, which can be tuned with dopant Br concentration. Two XEL peaks centered at around 456 and 479 nm have been observed for the CH 3 NH 3 PbCl 2.85 Br 0.15 single crystal scintillator. These two peaks originated from the near band-to-band emission and selfabsorption-induced re-emission. Thick crystals are able to enhance the self-absorption induced re-emission, while suppressing the near band-to-band emission.

The lithium-oxygen batteries (LOBs) have been suffering from the large charge overpotential for the sluggish oxygen evolution reaction (OER). Here, the strategy used in photo-electrochemical (PEC) water oxidation area is...