1 research outputs found
Blue-Green Color Tunable Solution Processable Organolead Chloride–Bromide Mixed Halide Perovskites for Optoelectronic Applications
Solution-processed organo-lead halide
perovskites are produced with sharp, color-pure electroluminescence
that can be tuned from blue to green region of visible spectrum (425–570
nm). This was accomplished by controlling the halide composition of
CH<sub>3</sub>NH<sub>3</sub>PbÂ(Br<sub><i>x</i></sub>Cl<sub>1–<i>x</i></sub>)<sub>3</sub> [0 ≤ <i>x</i> ≤ 1] perovskites. The bandgap and lattice parameters
change monotonically with composition. The films possess remarkably
sharp band edges and a clean bandgap, with a single optically active
phase. These chloride–bromide perovskites can potentially be
used in optoelectronic devices like solar cells and light emitting
diodes (LEDs). Here we demonstrate high color-purity, tunable LEDs
with narrow emission full width at half maxima (FWHM) and low turn
on voltages using thin-films of these perovskite materials, including
a blue CH<sub>3</sub>NH<sub>3</sub>PbCl<sub>3</sub> perovskite LED
with a narrow emission FWHM of 5 nm