Novel CsPbBr1.5I1.5@SrHAp single-phase white-light emitting phosphors: Facile synthesis, formation process, enhanced stability, and color-tunable luminescence.

[Display omitted] • A series of CsPbBr 1.5 I 1.5 @SrHAp composites were obtained by a hot injection method. • The formation mechanism of the nanocomposites was investigated in detail. • The color-tunable luminescence can be realized from blue through white and to yellow. • The thermal stability and emission intensity are improved by integrating SrHAp matrix. • The WLED device can exhibit bright white light with good CIE coordinate, CCT, and CRI. A variety of novel CsPbBr 1.5 I 1.5 @SrHAp nanocomposites have been fabricated by a facile one-pot hot injection method for the first time. An electrostatic interaction mechanism has been proposed to realize the in-situ growth of CsPbBr 1.5 I 1.5 perovskite quantum dots (PQDs) on SrHAp [strontium hydroxyphosphate, Sr 5 (PO 4) 3 OH] nanorods with negatively charged surfaces, which have been proved by the XRD, XPS, TEM, FT-IR, and density functional theory (DFT). The incorporation of SrHAp matrix for CsPbBr 1.5 I 1.5 not only greatly enhances the thermal and spectral stability but also increases the emission intensity of the CsPbBr 1.5 I 1.5 PQDs. More importantly, the fascinating color-tunable luminescence performance from blue through white and eventually toward yellow light can be realized in a single phase by simply changing the amounts of SrHAp matrix or excitation wavelengths. Thus, the CsPbBr 1.5 I 1.5 @SrHAp single-phase white light emitting phosphor can be obtained with excellent chromaticity coordinate (x, y) and CCT in the warm white region [(0.328, 0.340), 5698 K], which is close to the daily use of pure white light. The as-prepared LED device can exhibit dazzling white light emission by integrating CsPbBr 1.5 I 1.5 @SrHAp nanocomposite into a 365 nm UV LED chip, which indicates that the as-obtained CsPbBr 1.5 I 1.5 @SrHAp single-phase white emitting phosphor could be regarded as potential candidates for WLEDs. [ABSTRACT FROM AUTHOR]