Perovskite nanocrystals (PNCs) are a promising material with both display and environmental applications. In this project, the compounds synthesized were methyl ammonium lead bromide—octylammonium bromide (CH3NH3PbBr3—OABr), methyl ammonium lead bromide—octadecylammonium bromide (CH3NH3PbBr3—ODABr), methyl ammonium lead chloride—octylammonium chloride (CH3NH3PbCl3—OACl), and methyl ammonium lead chloride—octadecylammonium chloride (CH3NH3PbCl3—ODACl). The capped compounds —OABr and —ODABr possess green photoluminescence while the —OACl and —ODACl compounds possess blue photoluminescence. Studies on photoluminescence (PL) and absorbance spectra present sharp peaks: with -OABr fluorescing λ maximum at 529 nm; -ODABr fluorescing λ maximum at 532 nm; -OACl fluorescing λ maximum at 433 nm; -ODACl fluorescing λ maximum at 392 nm. Studies on electrogenerated chemiluminescence (ECL) analyzed the PNCs both in solution and immobilized on the electrode surface, as well as coreactant and ion annihilation studies. The strongest peaks were seen with coreactant ECL with the PNCs immobilized on the electrode surface. This optimized condition was used to collect the ECL spectrum of the nanocrystals using a charged coupling device (CCD) camera based ECL instrumentation, and these spectra were compared with their corresponding PL spectrum. The ECL spectrum collected for —OABr correlated very closely with the PL spectrum.

Electrochemical and electrogenerated chemiluminescence study of organolead halide perovskite nanocrystals

255th National Meeting (2018)

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