Highly efficient copper-based halide single crystals with violet emission for visible light communication

Abstract

K₂CuBr₃ single crystals (SCs) are synthesized using a cooling-induced crystallization method with violet emission due to self-trapped excitons (STEs) under photoexcitation. The prepared K₂CuBr₃ SCs exhibit a high photoluminescence quantum yield (PLQY, 79.2%) and excellent stability against moisture, heat and UV light. When the K₂CuBr₃ SCs are used as a light source for visible light communication the data transmission rate reaches a striking 248 Mbps, which is more than 33-fold the −3 dB bandwidth.