Abstract
Currently, the poor stability of inorganic perovskite CsPbX3([Formula: see text], Br, I) nanocrystals restricts their practical application in optoelectronic devices. Therefore, improving the stability of this material remains an urgent task for most researchers. In this study, incorporation of CsPbBr3nanocrystals into porous AlO(OH) matrices through simple in situ synthesis was demonstrated to be an efficient approach for improving the nanocrystal stability. X-ray diffraction (XRD) revealed that the as-obtained product was composed of cubic CsPbBr3nanocrystals and orthorhombic AlO(OH) compounds. In addition, transmission electron microscopy (TEM) revealed that the CsPbBr3nanocrystals were successfully encapsulated by AlO(OH) matrices. The Brunauer–Emmett–Teller (BET) specific surface area was 234.96[Formula: see text]m2g[Formula: see text] for AlO(OH) and 60.08[Formula: see text]m2g[Formula: see text] for the CsPbBr3@AlO(OH) composites. The decrease in surface area could be attributed to the filling of the AlO(OH) pores by the CsPbBr3nanocrystals. Further, the as-prepared composites showed red-shifted emission at 522[Formula: see text]nm and a larger full width at half-maximum (FWHM) as 26[Formula: see text]nm, compared with those of the CsPbBr3nanocrystals with the emission at 517[Formula: see text]nm and FWHM as 17[Formula: see text]nm. More importantly, the emission intensity preserved 67% of the original value after a storage time of 120[Formula: see text]h, but bare CsPbBr3nanocrystals rapidly degraded within only 1[Formula: see text]h in the polar ethanol solution. Finally, a light-emitting diode (LED) device was fabricated by coating the CsPbBr3@AlO(OH) composites and red commercial K2SiF6:Mn[Formula: see text] phosphors on the surface of a blue InGaN chip, covering 96% of National Television Standards Committee. The results indicate that the obtained composites could be promising luminescent materials for backlit displays.
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