Tunable photoluminescence of CsPbBr₃ perovskite quantum dots for light emitting diodes application

All-inorganic cesium lead halide (CsPbBr₃) perovskite quantum dots (QDs), as one kind of promising materials, have attracted considerable attention in optoelectronic applications. Herein, we synthesized the colloidal CsPbBr₃ QDs with tunable photoluminescence (PL) (493–531 nm) by adjusting the reaction temperatures, which revealed narrow emission bandwidths of about 25 nm. The average diameters of the QDs could be adjusted from 7.1 to 12.3 nm as the temperature increased from 100 °C to 180 °C. Moreover, the radiative lifetimes of CsPbBr₃ QDs were measured to be ~ 2 ns, and the single QD fluorescence intensity time trace results demonstrated its suppressed blinking emission. Moreover, green light emitting diodes by using CsPbBr₃ QDs casted on blue LED chips were further fabricated, which provided potential applications in the field of display and lighting technology.