Enhanced stability of CsPbBr3 Quantum Dots by anchoring on the hierarchical three-dimensional layered double hydroxide

Abstract

The poor stability of all-inorganic perovskite quantum dots (QDs) limits its application in the field of optoelectronics although it possesses prominent luminescent properties. Herein, we proposed a selective nucleation-growth strategy through anchoring the CsPbBr3 QDs on the aminated hierarchical three-dimensional layered double hydroxide (A3D-LDH). The strong interaction between the amino group and Pb2+ endows the anchoring effect of A3D-LDH. Coordinated with the isolation effect of flower-like structure, the A3D-LDH/CsPbBr3 composites exhibited high solid photo-luminescence quantum yield (82.35%) and enhanced stability against the adverse environment (humidity air, irradiation, and heat), which is attributed to restricted aggregation and surface passivation of CsPbBr3 QDs. Benefiting from the advantageous properties, an efficient white light-emitting diode (LED) is fabricated by introducing A3D-LDH/CsPbBr3 composites as green phosphors with color coordinates (0.349, 0.349) at a correlated color temperature of 4841 K. We believe that our method offered a promising candidate for solid-state lighting and display.