Starting materials: BABr (synthesized), CsBr, PbBr2, HBr
Product: Yellow single crystals
Description: (BA)2Cs2Pb3Br10 crystals were synthesized by mixing BABr, CsBr, and PbBr2 into a saturated HBr solution at a molar ratio of 3.5:2:3. Complete dissolution was achieved by heating to 100°C with constant stirring for ~30 minutes. Upon slowly cooling, at a rate of 20°C/min to room temperature, the crystals precipitated. The crystals were removed by suction filtration and were dried in a vacuum.
Method: Photoluminescence microscopy
Description: PL spectra were recorded in a PL microscope. A Janish Research Company ST-500 microscope cryostat using a Coherent OBIS 375LX laser was used for the measurements.
Crystal system: orthorhombic
| Photoluminescence peak position, nm |
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Starting materials: BABr, CsBr, PbBr2, HBr
Product: Yellow single crystals
Description: (BA)2Csn-1PbBr3n+1 crystals were synthesized by mixing BABr, CsBr, and PbBr2 into a saturated HBr solution in an appropriate stoichiometry. Complete dissolution was achieved by heating to boiling with constant stirring for ~30 minutes. Upon slowly cooling to room temperature colorless (n = 1) and yellow (n = 2 and 3) precipitated in their respective solutions. The crystals were removed by suctio9n filtration and were dried in a vacuum. Pure-phase single crystals were obtained via the following BA:Cs:Pb ratios: n = 1, 2:0:1; n = 2, 3:1:2, n = 3, 3.5:2:3.
Method: Photoluminescence Spectra
Description: A Janish Research Company ST-500 microscope cryostat using a Coherent OBIS 375LX laser was used to measure low-temperature PL. An excitation wavelength of 375 nm was used. PL spectra at high temperature was performed in the same system with a HCP422G gas-tight hot plate.