Materials with two or more fluorescence under different excitation sources have great potential in optical applications, but luminous materials with three emission characteristics have been largely undeveloped. Here, we report a novel zero-dimensional (0D) organic-inorganic hybrid ((C2H5)4N)2ZrCl6 perovskite with multiple emission. The zirconium-based perovskite exhibits a red emission around 620 nm, a green emission at 527 nm, and a blue emission around 500 nm. The red and green emissions come from self-trapped excitons (STEs) and d-d transition of Zr(IV), respectively, which are caused by distortion of [ZrCl6]2- octahedrons. The blue emission is caused by thermal activation delayed fluorescence (TADF) which is similar to that of Cs2ZrCl6. The absolute photoluminescence quantum yield (PLQY) of the red and blue double emission is to 83% and PLQY of green emission is 27%. With different combinations of ((C2H5)4N)2ZrCl6 samples, we achieve a variety of applications including a two-color luminescent anti-counterfeiting device, a white light-emitting diode (WLED) with color rendering index (CRI) of 95 and information encryption under different excitation. We also synthesize other hybrid zirconium perovskite with tri-luminescence through similar method. Our work provides a potential set of excitation-dependent luminescent materials and is expected to expand the basic research and practical applications of multi-luminescent materials.

This article is Open Access

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