Wavelength-tunable photoluminescence of CsPbBr3 microcrystal via in situ halogen doping.

Lead halide perovskite semiconductors have received significant attention in recent years as promising candidates for optoelectronic applications. Their controllable bandgap in nanostructures (nanocrystals, nanowires) has been widely and successfully investigated. Intentionally manipulating the atomic behavior with dopants in their macroscopic structure with high quality and stability is still challenging. We studied the crystal structure and photoluminescence (PL) behavior of the anion (Cl) doped CsPbBr 3 microcrystals. The doped microcrystal with a low doping concentration has shown a large wavelength-tunable PL emission from 535 nm to 457 nm. Two separate emission peaks (blue and green) are carefully studied in the excitation power dependent PL spectra. The doping and excitation endow the perovskite microcrystal adjustable PL emission band and peak intensities, which may serve as a new degree of manipulation freedom in the color-tunable display and functional optoelectronics. • The Cl doped CsPbBr 3 microcrystals with good stability have been synthesized by the hydrothermal antisolvent method. • The wavelength-tunable PL from green to blue emission bands was achieved by controlling the dopant concentration. • Excitation power dependent PL spectra indicate that the intensities of two emission have inhomogeneous trends. [ABSTRACT FROM AUTHOR]