Concentration- and temperature-dependent photoluminescence of CsPbBr3 perovskite quantum dots

The concentration and temperature dependence of photoluminescence (PL) performance was investigated, which indicated that the main emission in CsPbBr 3 perovskite quantum dots was related to the band-edge mechanism. As the concentration increased from 0.1 to 10.0   mol/L at 293   K, the center of emission band exhibited a regular redshift, as well as the peak intensity increased initially and then declined, which could be attributed to the self-absorption processes. Along with the variation of temperature (273–353   K), peak wavelength, full width of half maximum (FWHM), and peak intensity of PL spectra presented a corresponding linear changes. In addition, the temperature reversibility revealed that CsPbBr 3 QDs were reliable candidates for temperature sensor and optoelectronic devices .