Bright and Stable Perovskite Nanocrystals Lighted Up Remotely by Means of Wireless Power Transfer

Halide perovskite nanocrystals (NCs) are an emerging family of low‐cost and high‐efficiency luminescent nanomaterials. They offer a broad gamut of emitted light colors owing to the broad bandgap tunability of the perovskite via anion variation. Previously, to lighten up perovskite NCs, they were placed between two electrodes to inject charge carriers or were integrated with commercial blue light‐emitting diodes powered by electric contacts. However, the opportunities for remote lighting of perovskite NCs have not been explored yet. In this work, the principles of wireless power transfer of electromagnetic energy are applied to light up perovskite NCs encapsulated into a polymer matrix. The photoluminescence and absorption spectra of the CsPbBr 3 NCs in a polymer matrix on incident laser power density are experimentally studied. As a proof of concept, chess pieces are created consisting of the perovskite NCs and charge from a chessboard with an integrated metasurface‐based resonator that provides quasi‐homogeneous power distribution. The efficient lighting of the chess pieces with encapsulated NCs is demonstrated over the whole area of the chessboard at various heights up to ≈10 cm. The results of the study open the door for potential applications of perovskite NCs with remote lighting capability.