UV-Stable Inorganic Perovskite Quantum Dots/Cellulose Nanocrystals Hybrid Structures

Abstract

In recent year, colloidal lead halide perovskite quantum dots (PQDs) play a vital role in the development of various optoelectronic devices including solar cells, light emitting diodes, or displays due to their intriguing properties such as narrow emission peaks, tunable bandgap, and ultrahigh (>90%) photoluminescence quantum yield. However, the poor stability of PQDs either under ambient condition or under ultraviolet (UV) illumination significantly limits PQDs for practical applications. Herein, we developed a novel oleylamine and oleic acid-free strategy to effectively stabilize inorganic CsPbX3 (X = Cl, Br, or I) PQDs by synthesizing PQDs with cellulose nanocrystals (CNC) at room temperature. The as-prepared PQDs/CNC hybrid structures are highly stable and the photoluminescence (PL) intensity can be maintained at 88% of its original value under ambient environment for 2 months, at 90% of its original value under UV light illumination for 600 hours and at 86% of its original value under high temperature (100 °C) for a week, respectively. In addition, by controlling the halide concentration, the hybrid structure can be successfully tuned for light emission throughout the visible spectrum. The high stability, narrow emission peaks, and wavelength tunable characteristics reported here for PQDs/CNC hybrid structures can provide the possibility for practical applications in the future development of PQDs related devices.