Low-dimensional Perovskite

Perovskite has structure in which the octahedral of [BX6]4- shares the corner and the A cation occupies the 12-fold cuboctahedra site. When the halide metal octahedron network is separated by ‘A’ cationic lattices and is present in a plate, rod or cluster form, charge carriers become localized. This improves the exciton binding energy potentially leading to a highly efficient Light-Emitting Diodes.

Colloidal Perovskite NCs

Colloidal perovskite nanocrystals are emerging as a strong candidate for next-generation LED material. Perovskite nanocrystals exhibits high photoluminescence quantum yields (PLQY ~ 80 %, without applying core- shell structure) with high color purity (FWHM~20 nm), which are superior to Ⅱ-Ⅵ or Ⅲ-Ⅴ quantum dots. By modifying the compositions of A sites (MA+, FA+, Cs-) and X sites (I-, Br-, Cl-), they can produce wide color gamut (Covering 150% area of NTSC). Such excellent properties produce colloidal perovskite nanocrystals can be adapted in next generation light emitting applications. However, several issues concerning the toxicity of lead, and colloidal stabilities of nanocrystals after purification need to be resolved.