Highly efficient silica-coated Eu3+ and Mn2+ doped CsPbCI3 perovskite quantum dots for application in light-emitting diodes

Perovskite quantum dots (PQDs) are potential luminescent materials for display and LED illumination, whereas CsPbCI3 quantum dots (QDs) exhibit low luminescence quantum yields (QYs), limiting their wide application. In this work, Mn2+ and Eu3+ doped all-inorganic CsPbCI3 QDs were prepared, which were encapsulated into SiO2 film to form ultra-stable and highly luminescent CsPbCI3/SiO2 composites. Through silica coating, surface defects of the composites were reduced effectively, the luminescence QYs of the Eu3+ doped CsPbCI3 PQDs increased from 3.52% to 49.00%, and those of the Mn2+ doped CsPbCI3 PQDs increased from 21.01% to 50.84%. Using these composites, LEDs were prepared, exhibiting good stability and high luminescent efficiency for lighting applications. (C) 2019 The Japan Society of Applied Physics