Highly stable and water-soluble monodisperse CsPbX
                    <sub>3</sub>
                    /SiO
                    <sub>2</sub>
                    nanocomposites for white-LED and cells imaging

Nan Ding, Donglei Zhou, Xuke Sun, Wen Xu, Hongwei Xu, Gencai Pan, Dongyu Li, Shuang Zhang, Biao Dong, Hongwei Song

doi:10.1088/1361-6528/aac84d

<jats:title>Abstract</jats:title> <jats:p> In spite of the excellent optical properties of all-inorganic halide perovskite quantum dots (PQDs), they still suffer from inherent poor stability even when exposed to moisture from the atmosphere, restricting their applications, especially in white-light-emitting diodes (LEDs) and cells imaging. Here, we proposed a strategy by encapsulating the CsPbX <jats:sub>3</jats:sub> (X = Cl, Br, I) PQDs into silica nanoplates to prepare highly stable and water-soluble CsPbX <jats:sub>3</jats:sub> /SiO <jats:sub>2</jats:sub> nanocomposites. First, the 120 nm monodisperse CsPbX <jats:sub>3</jats:sub> /SiO <jats:sub>2</jats:sub> nanocomposites inlayed with several CsPbX <jats:sub>3</jats:sub> PQDs were fabricated via the modified Stöber method. After coating, their stability exposed in the air was largely improved for all the CsPbX <jats:sub>3</jats:sub> (X = Cl, Br, I) PQDs without changing their emission peaks and full-width at half-maximum, attributed to the suppression of the anion-exchange and decomposition. Moreover, further experiments demonstrated that the CsPbX <jats:sub>3</jats:sub> /SiO <jats:sub>2</jats:sub> nanocomposites were highly water-soluble and stable in the water. Their applications in LEDs and cell imaging demonstrated their ultrastability and high biocompatibility. Therefore, this study shows the possibility of their use in photoelectric devices and biological applications. </jats:p>

Highly stable and water-soluble monodisperse CsPbX <sub>3</sub> /SiO <sub>2</sub> nanocomposites for white-LED and cells imaging

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