Nanocomposites of CsPbBr3 perovskite quantum dots embedded in Gd2O3:Eu3+hollow spheres for LEDs application

Gd2O3:Eu3+@CsPbBr3 quantum dots (QDs) mesoporous hollow nanocomposites with good luminescent properties and high stability were built. Among which, the hollow Gd2O3:Eu3+ spheres and CsPbBr3 QDs were prepared by urea homogeneous precipitation and hot-injection method, respectively. Finally, the Gd2O3:Eu3+@CsPbBr3 QDs shell-core compounds were constructed through mechanical stirring. The structure, morphology, stability and luminescent properties were studied by Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry/thermogravity (DSC/TG), X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), pho-toluminescence excitation/photoluminescence (PLE/PL) and life decay tools. Compared to the original CsPbBr3 QDs, Gd2O3:Eu3+@CsPbBr3 QDs display better photostability, thermal stability and current sta-bility. The resulting Gd2O3:Eu3+@CsPbBr3 QDs composite exhibits good yellow emission. The Gd2O3:Eu3+@CsPbBr3 QDs mixed silicone resin was directly coated on the blue LED chip, then the w-LED device with the color coordinate of (0.31, 0.32) was successfully assembled. The Gd2O3:Eu3+@CsPbBr3 QDs compounds with excellent luminescent properties and stability are expected to be widely used in lighting and display areas.(c) 2021 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.

Automated summary

Gd2O3:Eu3+@CsPbBr3 quantum dots (QDs) mesoporous hollow nanocomposites with good luminescent properties and high stability were fabricated. The composite consisted of hollow Gd2O3:Eu3+ spheres and CsPbBr3 QDs, and the shell-core structure was formed through mechanical stirring. The resulting composite demonstrated better photostability, thermal stability, and current stability compared to the original CsPbBr3 QDs. Moreover, it exhibited excellent yellow emission. The Gd2O3:Eu3+@CsPbBr3 QDs were directly coated on a blue LED chip, leading to the successful assembly of a w-LED device with desirable color coordinates. These promising luminescent and stable Gd2O3:Eu3+@CsPbBr3 QDs compounds are expected to find wide applications in lighting and display areas.