Crystal system: monoclinic
| Photoluminescence peak position, nm |
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Starting materials: HI, HA (C6H13NH3), Et2O, PbI2
Product: Thin film of (C6H13NH3)2PbI4
Description: Prepare hexylammonium iodide salts via neutralization of HI with HA. Remove unreacted species by evaporation. Purify product by recrystallization in minimal diethyl ether/excess hexane and isolate via vacuum filtration. Prepare films by spin-coating or drop-casting solutions (prepared by dissolving HAI and PbI2 powders at a 2.5:1 molar ratio in a 1:0.34 volume ratio mixture of THF and methanol). Spin-coat films from solutions of 20 mg/mL at 2000 rpm for 30 s and anneal for 15 min at 70 °C.
Method: Photoluminescence spectra
Description: Steady-state photoluminescence emission spectra of spin-coated films on glass were measured at room temperature with a step size of 1 nm in an Edinburgh Instruments FLS980 fluorimeter by exciting with monochromated light with a 2 nm bandwidth at 480 nm.
Comment: Refer to Figure 1 for PL spectra
Crystal system: orthorhombic
| Photoluminescence peak position, eV |
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Starting materials: Lead(II) oxide (PbO, <10 μm, ReagentPlus®, ≥99.9% trace metals basis ), HI (57 wt. % in H2O), hexylamine 99%, H3PO2 (50 wt. % in H2O)
Product: orange plate-like crystals
Description: PbO powder (2232 mg, 10 mmol) was dissolved in 57% w/w aqueous HI solution (16 mL) in a 50 mL glass flask by heating to boiling under stirring. A bright yellow solution resulted. 1000 μL (7.52 mmol) of hexylamine in 50% aqueous H3PO2 (2 mL) was slowly added. The solution was slowly cooled to room temperature.
Method: Photoluminescence microscopy
Description: Data was collected with a Horiba LabRam Evolution high-resolution confocal Raman microscope spectrometer (600g/mm diffraction grating, with a diode continuous wave laser (473 nm, 25 mW) and a Synapse charge-coupled device camera. PL energy was calculated by the PL peak position of the optical emission spectra.