Open AccessIndication of CsPbBr 3 inclusions in zero dimensional Cs 4 PbBr 6 perovskite single crystals by alkylammonium post‐treatment
Author(s) -
Aharon Sigalit,
Etgar Lioz
Publication year - 2021
Publication title -
nano select
Language(s) - English
Resource type - Journals
ISSN - 2688-4011
DOI - 10.1002/nano.202000119
Subject(s) - photoluminescence , perovskite (structure) , chemistry , band gap , molecule , analytical chemistry (journal) , mineralogy , crystallography , materials science , optoelectronics , organic chemistry , chromatography
The zero‐dimensional Cs 4 PbBr 6 perovskites are highly emissive materials that demonstrated an effective potential in light emitting applications. There is an on‐going debate regarding the origin of its strong and green photoluminescence, which is not in line with the expectedly wide band‐gap energy of the strongly confined material. Herein, using mortar and pestle, we react Cs 4 PbBr 6 single crystals with methanol solutions of ammonium barrier molecules, and affect their optical and compositional properties. The ammonium barrier molecules react with the 0D Cs 4 PbBr 6 crystals, and lead to a structural transformation of the CsPbBr 3 inclusions into two‐dimensional perovskite within the 0D phase of the Cs 4 PbBr 6 . In addition, the photoluminescence quantum yield was increased as a result of the post treatment. This can explain the origin of the strong, green photoluminescence from these crystals. This novel post‐treatment affects the properties of the CsPbBr 3 inclusions in Cs 4 PbBr 6 crystals by a straightforward process, which can be utilized to another 0D perovskite.