Bromopropane as a novel bromine precursor for the completely amine free colloidal synthesis of ultrastable and highly luminescent green-emitting cesium lead bromide (CsPbBr₃) perovskite nanocrystals

Abstract

Recently lead halide perovskite nanocrystals (PNCs) have attracted intense interest as promising active materials for optoelectronic devices. However, their extensive applications are still hampered by poor stability in ambient conditions....

Surface-State-Mediated Interfacial Hole Transfer Dynamics between CsPbBr3 Perovskite Nanocrystals and Phenothiazine Redox Couple

“…Herein we have synthesized three different types of surface chemistry based CsPbBr 3 PNCs using the hot injection method with slight modifications. , In brief, amine CsPbBr 3 PNCs were synthesized using the two-precursor approach route where oleic acid (OA) and oleylamine (OAm) act as surface capping ligands. Amine + TOP capped CsPbBr 3 PNCs were synthesized by slight modification using the above conventional amine synthesis in the presence of trioctylphosphine (TOP) with the addition of OA and OAm as surface capping ligands.…”

“…But in the past few years, researchers have been expanding the library of suitable surface ligands for PNCs. To stabilize the CsPbBr 3 PNCs, several efforts have been made such as the use of quaternary amines, − zwitterionic ligands, , and alkyl phosphine ligands − as surface capping ligands. Most often these new ligands are selected to maximize the stability of PNCs from exposure to moisture, polar environments, and light-induced degradation. , Therefore, when choosing the ligand system, the amount, the ligand chain length, and, the ligand branching have also demonstrated an impact on the dimensionality and, in some cases, the stoichiometry of PNCs may give raise to CsPbBr 5 and Cs 4 PbBr 6 …”

Inner Filter Effect as a Boon in Perovskite Sensing Systems to Achieve Higher Sensitivity Levels

“…A-ABA ligands bind firmly to the Pb 2+ -rich surface through dual functional groups, thus passivating the uncoordinated sites. Enhanced passivation of surface defects and core confinement leads to reduced surface trap-assisted quenching, which could otherwise result in nonradiative recombination of excitons and degradation of PL emission …”

“…Enhanced passivation of surface defects and core confinement leads to reduced surface trap-assisted quenching, which could otherwise result in nonradiative recombination of excitons and degradation of PL emission. 46 The detection of Co 2+ was done in organic medium. Obtaining water stable and compatible PQDs for these applications is quite challenging.…”

Enhanced Stability and Luminous Performance for Structured Mn‐Doped CsPbCl3 Quantum Dots

“…[11][12][13] As the QDs are undergoing continuous degradation when subjected to moisture, oxygen and polar solvents, those surface defects gradually quench the PL emissions. [14] To solve the above drawbacks, many achievements have been made on the stability of the "green" CsPbBr 3 , [15][16][17][18][19][20][21] however, the progress on the red gamut from IOHP QDs is inferior to the "green" counterparts. Typically, the PL QY of CsPbCl 3 is lower than 15 %, [11,22,23] while the intrinsic "red" CsPbI 3 suffers severe degradation.…”