Dual-emitting CsPbX3@ZJU-28 (X = Cl, Br, I) composites with enhanced stability and unique optical properties for multifunctional applications

Currently, all-inorganic CsPbX3 (X = Cl, Br, and I) perovskite quantum dots (QDs) receive great attention due to their spectacular characteristics and optical properties. However, the stability problem greatly restricts the applicability of CsPbX3 QDs. Herein, a novel protection strategy is reported by in-situ growth of CsPbX3 QDs in the mesoporous blue-emitting indium-based metal organic frameworks (ZJU-28). Accordingly, the CsPbX3@ZJU-28 composites possess dual-emission with broad band blue light emission ascribed to pi-pi* transitions of organic ligands in ZJU-28 and a distinctive narrow peak attributed to the excitonic emission of CsPbX3 QDs. Intriguingly, the CsPbX3@ZJU-28 exhibited both excitation-wavelength dependent and temperature dependent luminescence properties, which make the composites promising for potential application in anti-counterfeiting and temperature sensing. In addition, the ZJU-28 matrix encapsulation give CsPbX3 QDs greatly improved stability, which makes them attractive in LED applications. Therefore, this work will broaden the applicability of CsPbX3 QDs in multifunctional applications, such as anti-counterfeiting, temperature sensing and LEDs.