Dual modulating luminescence in all-inorganic perovskite CsPbBr3 quantum dots

Abstract All-inorganic perovskite quantum dots (AIP QDs) have triggered extensive interest due to their unique optical properties in very recent years. The downconversion (DC) and upconversion (UC) luminescence corresponding to Stokes and anti-Stokes effect are two reverse luminescence phenomena. However, it is seldom to realize these two-reverse luminescence effects in individual QDs simultaneously. Therefore, it is highly desirable to develop comprehensive optical characteristics in order to achieve the multifunction in AIP QDs. Here, colloidal CsPbBr3 perovskite QDs were successfully synthesized by a convenient solution approach. The as-prepared colloidal CsPbBr3 QDs possess highly crystallinity. The DC and UC luminescence properties were studied under ultraviolet (UV) light and infrared (IR) lasers. We have demonstrated that CsPbBr3 QDs exhibited both strong green emission from DC and UC characteristic. In addition, a light-emitting diode device was demonstrated with our CsPbBr3 QDs, showing high-purity green feature. This work reveals the photoluminescence of AIP CsPbBr3 QDs excited by different excitation sources, promoting their multi-functional applications for downconversion and upconversion luminescence.