Novel Perovskite Quantum Dots And Hydroxyapatite Nanocomposites: Enhanced Thermal Stability, Improved Emission Intensity, And Color-Tunable Luminescence

All-inorganic perovskite (CsPbX3, X = Cl, Br, and I) quantum dots (PQDs) are new stars of semiconductor optoelectronic materials with superior optical properties. However, due to the ionic nature of crystal structure, the stability of PQDs is relatively poor, which seriously hinders their practical application. Herein, the strontium hydroxyapatite (SrHAp) with mesoporous structure and defect-luminescence properties has been introduced as inorganic matrix material to modify the surface of CsPbBr3 QDs. A series of novel CsPbBr3@SrHAp nanocomposites have been prepared by a simple room-temperature synthesis approach for the first time. The CsPbBr3@SrHAp nanocomposites not only enhance the green light emission of the CsPbBr3 QDs, but also realize the color-tunable luminescence from blue through cyan and eventually toward green emission by simply adjusting the relative composition of CsPbBr3@SrHAp. Meanwhile, the thermal stability of CsPbBr3 QDs in the nanocomposites is dramatically improved by incorporating the SrHAp matrix. Furthermore, the as-obtained LED device by combining the CsPbBr3@SrHAp nanocomposite and 365 nm LED chip can exhibit dazzling green light emission, which indicates potential prospects and applicability of the nanocomposites for lighting and display devices. (C) 2020 Elsevier B.V. All rights reserved.