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Tunable localized surface plasmon resonance in quasi-metallic W18O49 was achieved by morphology control and the urchin-like nanospheres showed blue-shifted extinction as well as enhanced photoreduction properties towards Cr(vi).

Doping cesium lead halide perovskite nanocrystals (NCs) with Mn2+ brings attractive long‐wavelength emission and flexible color tunability. However, due to multiple competing factors, the exciton‐to‐Mn2+ energy transfer efficiency is low. In this work, a simple structure‐optimization strategy is applied to enhance the exciton‐to‐Mn2+ energy transfer by synthesizing Mn2+ activated 3D/0D Cs–Pb–Cl perovskite composition composed of 3D CsPbCl3 and 0D Cs4PbCl6 NCs. The results reveal that the energy transfer efficiency and the photoluminescence quantum efficiency of the Cs–Pb–Cl composite are 65.3% and 77.3%, respectively, which are 1.4 and 3 times the corresponding values of the single‐phase CsPbCl3:Mn2+ NCs. Based on the detailed experimental and calculation results, the performance enhancement is demonstrated to stem from the optimized growth process of 3D CsPbCl3 NCs when co‐generating with 0D Cs4PbCl6 NCs. The strong lattice rigidity of the optimized CsPbCl3 NCs suppresses the nonradiative combination rate of the excitons, thus alleviating the main competing factor of the energy transfer process and improving the energy transfer efficiency. Fabrication of a white light‐emitting diode prototype further illustrates the application potential of the orange‐emitting Cs–Pb–Cl composite NCs for general lighting.

The development of solid-state carbon dots with good photoluminescence performance both at room temperature and high temperature is still challenging. Herein, we apply a facile and rapid anti-solvent-induced in-situ recrystallization...