Control of oleylamine to perovskite ratio in synthesis of MAPbBr3 nanoparticles

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

“…[ 126,170 ] In contradiction to this proposed growth model, MAPbBr 3 nanomaterials synthesized using the LARP method with OA and OAm resulted in nanoplatelets at lower concentrations of OAm and nanospheres at higher concentrations of OAm. [ 171 ] Initially, upon increase of OAm concentration, a blue shift in emission was observed, indicative of a decrease in nanoplatelet thickness and an increase in quantum confinement. [ 171 ] This was followed by a redshift due to a morphology transition to nanospheres.…”

“…[ 171 ] Initially, upon increase of OAm concentration, a blue shift in emission was observed, indicative of a decrease in nanoplatelet thickness and an increase in quantum confinement. [ 171 ] This was followed by a redshift due to a morphology transition to nanospheres. [ 171 ] In this case, it was argued that at excessively high concentrations of OAm, the platelet structure could no longer accommodate all of the ligands, preferring instead to break apart and form spherical‐shaped particles with newly exposed surfaces for ligation.…”

“…[ 171 ] This was followed by a redshift due to a morphology transition to nanospheres. [ 171 ] In this case, it was argued that at excessively high concentrations of OAm, the platelet structure could no longer accommodate all of the ligands, preferring instead to break apart and form spherical‐shaped particles with newly exposed surfaces for ligation. [ 171,172 ]…”

LEDs using halide perovskite nanocrystal emitters

“…[20][21][22][23][24]35 Normally, LHPs NCs have a 3D structure, which is similar to the bulky counterpart. By decreasing the dimension of the LHP NCs to a size comparable to the exciton Bohr radius, the quantum confinement effect emerges, and with strong quantum confinement the emission from LHP NCs exhibits a significant blueshift, 21,88 even to the blue range. 35,82 However, as the size of the exciton Bohr radius is comparable to the [PbX 6 ] 4− cell, it is difficult to precisely control the particle size in 3D structure LHP QDs, which may lead to a broadening of the emissive spectrum.…”

“…35,82 However, as the size of the exciton Bohr radius is comparable to the [PbX 6 ] 4− cell, it is difficult to precisely control the particle size in 3D structure LHP QDs, which may lead to a broadening of the emissive spectrum. 21,88 Due to the small size and light weight of LHP QDs, post-treatments, e.g., purification and concentration, of the primary colloidal solution becomes difficult.…”