Zhou Bo, Xiao Guowei, Yan Dongpeng
Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China.
Adv Mater. 2021 Apr;33(16):e2007571. doi: 10.1002/adma.202007571. Epub 2021 Mar 9.
Molecular afterglow materials with ultralong-lived excited states have attracted considerable interest owing to their promise for light-emitting devices, optical imaging, and anti-counterfeiting applications. However, the realization of ultralong afterglow emission in low-dimensional micro/nanostructures has remained an open challenge, limiting progress toward new-generation photonic applications. In this work, new types of mono/binuclear metal-organic halide micro/nanocrystals with tunable afterglow properties, made possibly by the rational control over both ultralong-lived room-temperature phosphorescence and thermally activated delayed fluorescence, are developed. Interestingly, the mono/binuclear coordination complexes present excitation-dependent luminescence across a wide range (wavelength > 150 nm) with broad emission color differences from blue to yellow owing to the multiple long-lived excited states. The 1D binuclear metal-organic microrods further exhibit excitation-dependent optical waveguide and space/time dual-resolved afterglow emission properties, endowing them with great potential in wavelength-division multiplexing information photonics and logic gates. Therefore, this work not only communicates the first example of wide-range tunable ultralong afterglow of low-dimensional metal-organic micro/nanocrystals under ambient conditions but also provides a new route to achieve optical communications and photonic logic compilation at the micro/nanoscale.
具有超长寿命激发态的分子余辉材料因其在发光器件、光学成像和防伪应用方面的潜力而备受关注。然而，在低维微纳结构中实现超长余辉发射仍然是一个悬而未决的挑战，限制了新一代光子应用的发展。在这项工作中，通过合理控制超长寿命的室温磷光和热激活延迟荧光，开发出了具有可调余辉特性的新型单核/双核金属有机卤化物微纳晶体。有趣的是，单核/双核配位络合物由于具有多个长寿命激发态，在很宽的范围内（波长>150 nm）呈现出依赖于激发的发光，发射颜色从蓝色到黄色有很大差异。一维双核金属有机微棒进一步表现出依赖于激发的光波导和时空双分辨余辉发射特性，使其在波分复用信息光子学和逻辑门方面具有巨大潜力。因此，这项工作不仅展示了在环境条件下低维金属有机微纳晶体实现宽范围可调超长余辉的首个实例，还提供了一条在微纳尺度实现光通信和光子逻辑编译的新途径。
