Cathodoluminescence properties of phase pure low-dimensional Cs4PbBr6 perovskite and its stability under high-energy electron beams

We report on the facile emulsion approach to synthesize zero-dimensional inorganic Cs<inf>4</inf>PbBr<inf>6</inf> samples and explore their structural and luminescence properties. Crystallinity and morphological characterizations are performed, and the band gap is evaluated to be around 2.29 eV. The photoluminescence spectra of Cs<inf>4</inf>PbBr<inf>6</inf> perovskite exhibit peaks in the green region. Cathodoluminescence (CL) spectroscopy was executed to investigate the emission properties of the sample as well as its structural integrity under exposure to high-energy electron beams. The time-dependent CL study under exposure to electron beam reveals no apparent degradation even after 60 min and establishes the stability of the material. Graphical Abstract: [Figure not available: see fulltext.].