Oriented Growth of Highly Emissive Manganese Halide Microrods for Dual-Mode Low-Loss Optical Waveguides

• Published in: Angewandte Chemie International Edition 2024-11, p.e202419085
• Main Authors: Liao, Jin-Feng, Zhang, Zhipeng, Wang, Gang, Zhou, Lei, Yi, Ningbo, Tang, Zikang, Xing, Guichuan
• Format: Article
• Language: English
• ISSN: 1433-7851; 1521-3773; 1521-3773
• DOI: 10.1002/anie.202419085

Zero-dimensional (0D) structured lead-free metal halides have recently attracted widespread attention due to their high photoluminescence quantum yield (PLQY) and negligible self-absorption, showing enormous potential as optical waveguides towards miniaturized photonic devices. However, due to the great difficulty in growth of rod-like nano/micro-sized morphologies, such applications have been less explored. Herein, a new-type emissive organic-inorganic manganese (II) halide crystal (TPS MnCl , TPS=C H S, triphenylsulfonium) in the form of microrods is synthesized via a facile chloride ion (Cl ) induced oriented growth method. Due to a combination of attractive features such as a high PLQY of 86 %, negligible self-absorption and smooth crystal surface, TPS MnCl microrods are well suited for use in optical waveguide with an ultra-low optical loss coefficient of 1.20 ⋅ 10  dB μm , superior to that of most organic-inorganic metal halide hybrids, organic materials, polymers and metal nanoclusters to the best of our knowledge. Importantly, TPS MnCl microrods can further work as dual-mode optical waveguides, combining active and passive light transmission functionalities in one single crystal. In addition, TPS MnCl microrods also display remarkable performance in lighting and anti-counterfeiting due to their distinct optical properties and commendable stability.