Stabilizing CsPbBr3 quantum dots with conjugated aromatic ligands and their regulated optical behaviors

Bright CsPbBr3 Perovskite Nanocrystals with Improved Stability by In-Situ Zn-Doping

“…In Figure 3b of the Pb-4f spectra for both samples, two separated XPS peaks Pb(I) with binding energies of 138.5 eV and 143.2 eV correspond to the Pb 4f7/2 and 4f5/2 levels, which is well consistent with the Pb-Br bonding previously reported [21]. Two additional weak peaks Pb(II) appear at the shoulder should be related to the Pb-oleate [22], the by-product in the NC synthesis according to the following equation: 2Cs-oleate + 3PbBr2 → 2CsPbBr3 + Pb(oleate)2 The slight lower intensity of Pb(II) for CsPbBr 3 :Zn NCs indicates fewer residues of Pb-oleate after efficient antisolvent purification. Finally, it is worth mentioning that no obvious signal was detected in the energy range for metal Pb, which probably indicates that there are only trace amounts of Pb metals and the NCs are totally associated with the stoichiometric CsPbBr 3 .…”

Coordination units of Mn2+ modulation toward tunable emission in zero-dimensional bromides for white light-emitting diodes

“…S2 (ESI †). 47,48 It is observed that (C 5 H 14 N 3 ) 2 MnBr 4 and (CH 6 N 3 ) 2 MnBr 4 both exhibit the absorption peaks at B3300 cm À1 , B1650 cm À1 and B1000 cm À1 , which are ascribed to the stretching vibration, blending vibration of N-H and the C-N stretching vibration, respectively. Compared with (CH 6 N 3 ) 2 MnBr 4 , (C 5 H 14 N 3 ) 2 MnBr 4 possess additional absorption peaks at B2950 cm À1 , B2850 À1 and B1370 cm À1 , which are assigned to the -CH 3 asymmetric, symmetric stretching vibrations and deformation vibrations, respectively.…”

Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals

“…[ 253 ] Other, more complicated ligands like 1‐tetradecyl‐3‐methylimidazolium have been used to passivate CsPbBr 3 NCs utilized in WLEDs through ligand exchange strategies. [ 197 ] These LEDs demonstrated superior luminous efficiency (61.0 Lm W −1 ) compared to the devices fabricated from CsPbBr 3 NCs that had not undergone the ligand exchange ( Figure A). [ 197 ] Furthermore, the saturation current was increased from 80 mA for devices fabricated using native‐ligand CsPbBr 3 NCs to 120 mA for the 1‐tetradecyl‐3‐methylimidazolium‐capped CsPbBr 3 NCs (Figure 13A).…”

“…[ 197 ] These LEDs demonstrated superior luminous efficiency (61.0 Lm W −1 ) compared to the devices fabricated from CsPbBr 3 NCs that had not undergone the ligand exchange ( Figure A). [ 197 ] Furthermore, the saturation current was increased from 80 mA for devices fabricated using native‐ligand CsPbBr 3 NCs to 120 mA for the 1‐tetradecyl‐3‐methylimidazolium‐capped CsPbBr 3 NCs (Figure 13A). [ 197 ] These device performance improvements were attributed to the enhanced phosphor stabilities afforded from the ligand exchange.…”

“…Adapted with permission. [ 197 ] Copyright 2020, Elsevier. B) CIE color coordinates of a WLED device fabricated from a blue LED chip and green and red silica‐coated CsPbBr 3 and CsPb(Br/I) 3 NCs, respectively (white circle) and the color triangle of the WLED device (red dashed line) compared to the NTSC TV standard (black dashed line).…”