In this work, we demonstrate a room-temperature chiral liquid crystal which shows remarkable photon upconverted circularly polarized luminescence (UC-CPL). Circularly polarized luminescent materials with higher dissymmetry factor (g_lum) underpin the basis for future applications. Since most chiral organic molecules have only a small g_lum, it is vital to explore a new pathway to amplify the g_lum of organic compounds. Here, by dispersing a chiral emitter and a triplet donor into a room-temperature nematic liquid crystal, highly efficient triplet–triplet annihilation-based photon upconversion (TTA-UC) and UC-CPL were observed in the induced chiral nematic liquid crystal (N*LC). Moreover, this system could simultaneously amplify the promoted circularly polarized luminescence (CPL) and the upconverted circularly polarized luminescence. The dissymmetry factors g_lum of CPL and UC-CPL have been amplified by three orders of magnitude and one order of magnitude, respectively.

中文翻译：

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光子上转换手性液晶：显着放大的上转换圆偏振发光†

在这项工作中，我们演示了一种室温手性液晶，该液晶显示出显着的光子上转换的圆偏振发光（UC-CPL）。具有更高不对称系数（g _lum）的圆偏振发光材料为将来的应用奠定了基础。由于大多数手性有机分子仅具有小克_LUM，它是探索一种新的途径至关重要的扩增克_LUM有机化合物。在这里，通过将手性发射体和三重态供体分散到室温向列液晶中，在诱导的手性向列液晶中观察到了高效的三重态-三重态an灭基于光子的上转换（TTA-UC）和UC-CPL（N * LC）。此外，该系统可以同时放大增强的圆偏振发光（CPL）和上转换的圆偏振发光。CPL和UC-CPL的不对称因子g _lum分别放大了三个数量级和一个数量级。