Starting materials: PbI2, PbBr2, CsI, DMSO
Product: thin film
Description: 235.5 mg PbI2, 187 mg PbBr2, and 272 mg CsI were dissolved in DMSO to a final volume of 1 mL. This was stirred overnight at room temperature.
Method: UV-Vis spectroscopy
Description: UV–Vis spectra were collected using a Cary 500 UV–Vis–NIR spectrophotometer in air ambient environments.
Starting materials: Pb(DDTC)2, PbI2, PbBr2, CsI, DMSO
Product: thin film
Description: Synthesis of Pb(DDTC)2 by addition of 20.0 M NaDDTC·3H2O aqueous solution to Pb(NO3)2 aqueous solution (10.0 M) during constant stirring at room temperature. After 30 minutes, filtering of yellow precipitate and washing four times with water, drying at 60°C in oven. Dissolution of 30.22 mg Pb(DDTC)2 into 2.0 mL DMSO solution to result in Pb(DDTC)2-DMSO solution (0.03 M). 235.5 mg PbI2, 187 mg PbBr2, and 272 mg CsI were dissolved in DMSO and Pb(DDTC)2-DMSO mixed solution to a final volume of 1 mL with desired Pb(DDTC)2 concentration. This was stirred overnight at room temperature. Then thin films were deposited onto glass substrates.
Method: Steady-state photoluminescence
Description: The steady-state PL were acquired by Fluorolog-3-p spectrophotometer in air at room temperature. PL excitation wavelength was 380 nm.