Electrogenerated Chemiluminescence and Spectroelectrochemistry Characteristics of Blue Photoluminescence Perovskite Quantum Dots

Jeetika Yadav; Qiaoli Liang; Shanlin Pan

doi:10.1021/acsami.0c01050

Electrogenerated Chemiluminescence and Spectroelectrochemistry Characteristics of Blue Photoluminescence Perovskite Quantum Dots

ACS Appl Mater Interfaces. 2020 Jun 17;12(24):27443-27452. doi: 10.1021/acsami.0c01050. Epub 2020 Jun 3.

Authors

Jeetika Yadav¹, Qiaoli Liang¹, Shanlin Pan¹

Affiliation

¹ Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States.

PMID: 32407071
DOI: 10.1021/acsami.0c01050

Abstract

Lead-based perovskite MAPbX₃ (MA = CH₃NH₃, X = Cl and Br) has shown great potential benefits to advance modern optoelectronics and clean energy harvesting devices. Poor structural stability is one of the major challenges of MAPbX₃ perovskite materials to overcome to achieve desired device performance. Here, we present the electrochemical stability study of CH₃NH₃PbCl_1.08Br_1.92 quantum dots (QDs) by electrogenerated chemiluminescence (ECL) and photoluminescence (PL) spectroelectrochemistry methods. Electrochemical anodization of pristine MAPbX₃ QD film results in the disproportionate loss of methylammonium and halide ions (X = Cl and Br). ECL efficiency and stability of perovskite QDs in the presence of coreactant tripropyl amine (TPrA) can be greatly improved after being incorporated into a polystyrene (PS) matrix. Mass spectrum and X-ray photoelectron spectroscopy (XPS) measurements were used to provide chemical composition variation details of QDs, which are responsible for the ECL and PL characteristics (e.g., wavelength redshift) of perovskite QDs in an electrochemical cell.

Keywords: Blue light emission; electrogenerated chemiluminescence (ECL); nanocrystals; perovskite; photoluminescence (PL); polystyrene (PS); quantum dots (QDs).