Large-scale synthesis of layered double hydroxide nanosheet-stabilized CsPbBr3 perovskite quantum dots for WLEDs

All-inorganic perovskite quantum dots (PQDs) have received great attention in the field of optoelectronics because of their excellent optical properties . However, the application of perovskite is always limited because of its poor stability. Herein, the CsPbBr 3 PQDs were stabilized by two-dimensional (2D) nanosheets of layered double hydroxide (LDH) for the first time using a simple one-pot in-situ growth route. In the as-synthesized LDH/CsPbBr 3 nanocomposite, CsPbBr 3 PQDs are uniformly attached to the surface of the LDH nanosheets . The resulted composite powder showed good green-luminescence, high solid PLQY (∼41%), narrower FWHM (∼20.0 nm), long fluorescence lifetime, excellent humidity stability and photostability. The unique 2D structured LDH nanosheets imparts significantly enhanced stability to LDH/CsPbBr 3 composite. All these advantageous properties make the LDH-based fluorescent composite good candidate for flat-panel displays and lighting devices. Our research proposes a novel method to stabilize PQDs by using inorganic 2D nanosheet materials and provides new opportunities for the applications of perovskite in optoelectronic field such as white light-emitting diode (LED).