Strong violet emission from ultra-stable strontium-doped CsPbCl₃ superlattices

Abstract

Among the lead halide perovskites, photoluminescence quantum yields (PLQYs) of perovskite quantum dots (PQDs) in the violet are very lowest. This is an obstacle to the optical application of the...

Stable and Intense Violet-Emitting CsPbCl3 Nanocrystals for Light-Emitting Diodes: Directly Obtained by L-Type Surface Passivation

“…However, in the case of CsPbCl 3 NCs, this is reported to form nonemissive CsPb 2 Cl 5 NCs. 31 Interestingly, unlike earlier reports, 31,32 our NCs exhibit fairly strong emission even after multiple cycles of washing by polar (MeOAc) and nonpolar (hexane) solvents (details in the Supporting Information), monitored by the periodic removal of the ligand by FTIR measurements (Figure S6). For example, these NCs exhibit a PLQY of >67 and >71%, respectively, after five cycles of washing with MeOAc (Figure 2A) and hexane (Figure 2B) without any shift in the absorption or PL maximum (Figure S7).…”

“…A few lowintensity diffraction peaks observed between 10 and 20°after 10 cycles of washing with MeOAc indicate the formation of a small amount of nonemitting CsPb 2 Cl 5 in the sample (Figure 2C). 31,32 This becomes more clear from the TEM and PXRD data (Figure S9) of the samples recorded after 14 cycles of washing. The size of the NCs increases slightly due to removal of the surface ligands 21,33 beyond 10 cycles of washing.…”

“…After 10 cycles of washing with MeOAc and hexane, the NCs exhibit a PLQY of ∼43 and ∼52%, respectively (Figure A,B), with very little change in crystal structure and morphology (Figures C,E,F and S8). A few low-intensity diffraction peaks observed between 10 and 20° after 10 cycles of washing with MeOAc indicate the formation of a small amount of nonemitting CsPb 2 Cl 5 in the sample (Figure C). , This becomes more clear from the TEM and PXRD data (Figure S9) of the samples recorded after 14 cycles of washing. The size of the NCs increases slightly due to removal of the surface ligands , beyond 10 cycles of washing.…”

Sonochemical construction of hierarchical strontium doped lanthanum trisulfide electrocatalyst: An efficient electrode for highly sensitive detection of ecological pollutant in food and water

“…2 B. Two resolved peaks at 133.3 eV and 135.1 eV belonging to Sr 2+ 3d 5/2 and 3d 3/2 , respectively are detected [33] . Fig.…”

One-Pot Synthesis and Characterization of CuCrS2/ZnS Core/Shell Quantum Dots as New Blue-Emitting Sources

“…In addition, Gao et al prepared bulk-like ZnSe QDs as blue LEDs with a maximum PL peak at 446 nm, and PL quantum yield (PLQY) of ~100%, and external quantum efficiency (EQE) of 12.2% [ 15 ]. Additionally, Ji et al fabricated strontium-doped CsPbCl 3 superlattices for ultra-stable violet-emissive perovskite QDs (PQDs) with high PLQY of 82.4% [ 16 ]. However, their work required a significantly complex preparation process, such as various state precursors (solid and gas states), or an extremely careful step-by-step protocol for uniform and high-quality colloidal QDs.…”