Amino‐Mediated Anchoring Perovskite Quantum Dots for Stable and Low‐Threshold Random Lasing

TLDR

Halide perovskite quantum dots are promising for photodetectors, LEDs, and lasers, but their practical use is limited by severe chemical and optical degradation. The study aims to anchor Pe‑QDs onto silica surfaces via amino mediation to suppress photoluminescence and random‑lasing degradation, achieving highly stable, low‑threshold lasing and enabling multifunctional perovskite systems. A rapid, one‑pot amination‑mediated nucleation and growth process deposits Pe‑QDs onto silica spheres, allowing scalable production within minutes. The anchored Pe‑QDs exhibit negligible PL loss after 40 days in ambient conditions, retain 80 % intensity after 108 h UV exposure, and maintain stable random lasing for 2 months or 8 h continuous pumping, owing to isolation‑induced suppression of photo‑induced regrowth.

Abstract

Halide perovskite quantum dots (Pe‐QDs) have been considered as outstanding candidates for photodetector, light‐emitting diode, and lasing applications, but these perspectives are being impeded by the severe stability, including both chemical and optical degradations. This study reports on amino‐mediated anchoring Pe‐QDs onto the surfaces of monodisperse silica to effectively depress the optical degradation of their photoluminescence (PL) and random lasing stabilities, hence achieving highly stable and low‐threshold lasing. An amination‐mediated nucleation and growth process is designed for the general and one‐pot synthesis of Pe‐QDs on the surfaces of silica spheres. The facile synthetic process, which can be finished within several minutes, insures scalable production. Surprisingly, almost no PL degradation is observed after 40 d storage under ambient conditions, even 80% PL intensity can be maintained after persistently illuminated by UV lamps for 108 h. Subsequently, extremely stable random lasing is achieved after storage for 2 months or over continuously optical pumping for 8 h. Such high PL and lasing stabilities originate from the isolation effects due to the effective anchoring, which separate the Pe‐QDs from each other and inhibit the photoinduced regrowth and deterioration. This work will also open the window of perovskite‐based multifunctional systems.