In the organic−inorganic perovskites family, the 〈100〉-oriented type has been extensively investigated
as a result of its unique magnetic, optical, and electrical properties, and only one type of 〈110〉-oriented
hybrid perovskite stabilized by methylammonium and iodoformamidinium cations or the latter themselves
has been known so far. In this paper, another novel 〈110〉-oriented organic−inorganic perovskite (C6H13N3)PbBr4 (compound 1) has been prepared by reacting N-(3-aminopropyl)imidazole (API) with PbBr2 in
hydrobromic acid. The crystal structure is determined, which indicates that the perovskite is stabilized
by API. The introduction of the optically active organic ligand API into the hybrid perovskite results in
a red shift and a great enhancement of photoluminescence in the perovskite with respect to organic
ligand API itself. These results have been explained according to calculation based on density-functional
theory. Moreover, the excellent film processing ability for the perovskite (C6H13N3)PbBr4 together with
the improved optical properties makes it have potential application in optoelectronic devices.
Precise high-resolution x-ray-di8'raction measurements of the lattice parameters as a function of temperature are reported for the mixed system KMn& "Ca"F3 in the concentration range x (0.05. From the splitting of the cubic (0,0,4) Bragg reAection it is possible to determine the transition temperatures of the structural phase transitions which occur in this system and to establish the phase diagram in the concentration range x (0.05. Three structural phase transitions are observed in this system and the transition temperatures at which they occur are enhanced when Mn + ions are substituted by Ca'+ ions. The enhancement rates are, respectively, 5.8, 18, and 14 K/at. % Ca + ions. This shows that a crossover between the T, j and the T,2 transitions should occur at the extrapolated critical concentration x =0.075.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.