Starting materials: lead oxide (10 mmol), hydriodic acid (10 mL), hypophosphorous acid (1.7 mL ), C4H9NH3I, I2
Product: (BA)2PbI4:I2
Description: Single crystals of (BA)2PbI4 were synthesized in a method called acid precipitation. Through constant stirring and heating, lead oxide (10 mmol) was dissolved in a solution that contained hydriodic acid (10 mL) and hypophosphorous acid (1.7 mL). After, C4H9NH3I was added to the mixture, causing the bright yellow solution to change to an orange color precipitate. Continuous heating of the mixture followed until the precipitate was fully dissolved, forming orange crystals at room temperature. The crystals were obtained via filtration and bathed in diethyl ether. Dried (BA)2PbI4 crystals were placed in an open plastic tube which was kept in a closed glass vial containing molecular I2 for 2-3 hours at room temperature.
Comment: See supporting information page S3 for more information
Method: UV-vis absorption
Description: Optical diffuse-reflectance spectra were collected at room temperature using a Shimadzu UV-3600 plus UV-VIS-NIR spectrophotometer. The reflectance spectra were converted to absorbance by using Kubelka-Munk transformation: (α/S = (1 − R)^2/2R); α is the absorption coefficient, and S is the scattering coefficient R is the reflectance.
Starting materials: lead oxide (10 mmol), hydriodic acid (10 mL), hypophosphorous acid (1.7 mL ), C4H9NH3I, I2
Product: (BA)2PbI4:I2
Description: Single crystals of (BA)2PbI4 were synthesized in a method called acid precipitation. Through constant stirring and heating, lead oxide (10 mmol) was dissolved in a solution that contained hydriodic acid (10 mL) and hypophosphorous acid (1.7 mL). After, C4H9NH3I was added to the mixture, causing the bright yellow solution to change to an orange color precipitate. Continuous heating of the mixture followed until the precipitate was fully dissolved, forming orange crystals at room temperature. The crystals were obtained via filtration and bathed in diethyl ether. Dried (BA)2PbI4 crystals were placed in an open plastic tube which was kept in a closed glass vial containing molecular I2 for 2-3 hours at room temperature.
Comment: See supporting information page S3 for more information
Method: Photoluminescence
Description: Recorded on FLS 980 (Edinburgh Instruments).