Doped-CsPbBr(3)nanoparticles by the hot-injection method: simultaneous introduction of Mn(2+)& Sb(3+)ions for increased stability and their application in LEDs.

CsPbBrnanoparticles were synthesized by hot-injection using the pair of reagents MnBr-SbCland MnBr-SbBras doping precursors. Said nanoparticles were green-luminescent = 515 nm with an average particle size of ∼12 nm and with monoclinic and orthorhombic crystal structure lasting longer than 80 d at ambient conditions. Additionally, a 54% photoluminescence quantum yield was maintained for at least 60 d when using MnBr-SbBras precursors for doping. Transmission electron microscopy and selected area electron diffraction (SAED) revealed a reduced interplanar distance for the (110) planes for such condition = 0.57 nm-0.56 nm, suggesting heterogeneous doping into the analyzed nanoparticles, along with chemical analysis. On the other hand, Cl was detected through energy dispersive x-ray spectroscopy in the CsPbBrnanoparticles synthesized with the MnBrSbCldoping precursor; as a consequence, these nanoparticles displayed a slight blue-shift in their luminescence = 508 nm. Meanwhile, undoped CsPbBrnanoparticles decomposed into non-luminescent CsPbBrwith rhombohedral crystal structure before 80 d at ambient condition, as was evidenced by the SAED analysis. Finally, a green-luminescent LED = 519 nm was fabricated using the doped CsPbBrnanoparticles. The achieved stability points to an improvement in the passivation of CsPbBr's crystal structure through Sband Mndoping.