Flexible molecular crystal waveguides based on elastic molecular crystals (EMCs) are essential in flexible and compact optical materials. An increased loss coefficient α due to self-absorption is often a problem in optical waveguides (OWGs) of fluorescent chemical materials waveguiding photons in active mode. Herein, the development of anthracene-based elastic mixed molecular crystals (EMMCs) is reported for Förster Resonance Energy Transfer (FRET)-assisted OWG. To yield a FRET crystal system based on elastic molecular crystals, 1%–5% acceptor doping for fluorescent molecular crystals of 9,10-dibromoanthracene 1 was successful by selecting the same regioisomer having electron-withdrawing group, 9,10-diformylanthracene 2, as a dopant. In addition to conversion to the mixed system, there is a difference in the elastic modulus and hardness in EMC C1 and EMMC C2@1. However, the elastic behaviour was also shown in a few percent doping of the acceptor. The α value of this EMMC, composed of 1 including 1% of 2 (0.0077 dB/μm), is much lower than that of EMC composed of 1 (0.1258 dB/μm) because of reducing self-absorption in the FRET system. An efficient and flexible OWG was successfully developed by selecting an appropriate acceptor molecule and its low doping rate for mixed crystal construction. This method is a practical approach in various functional and flexible crystal systems.

中文翻译：

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基于弹性混合分子晶体的柔性福斯特共振能量转移辅助光波导

基于弹性分子晶体 (EMC) 的柔性分子晶体波导对于柔性和紧凑的光学材料至关重要。由于自吸收而导致的损耗系数α增加通常是荧光化学材料在主动模式下波导光子的光波导（OWG）中的一个问题。在此，报道了用于福斯特共振能量转移（FRET）辅助 OWG 的蒽基弹性混合分子晶体（EMMC）的开发。为了产生基于弹性分子晶体的 FRET 晶体系统，对 9,10-二溴蒽荧光分子晶体进行 1%–5% 受体掺杂1 取得成功选择相同的具有吸电子基团的区域异构体9,10-二甲酰基蒽2作为掺杂剂。除了转换为混合体系外，EMCC1和EMMCC2@1。然而，弹性行为也显示在受主的几个百分比的掺杂中。此 EMMC 的 α 值，由 1 组成，包括 1% 2 (0.0077 dB/μm)，远低于1<组成的EMC a i=16> (0.1258 dB/μm) 因为减少了 FRET 系统中的自吸收。通过选择合适的受体分子及其低掺杂率的混合晶体结构，成功开发了高效灵活的OWG。该方法在各种功能和灵活的晶体系统中是一种实用的方法。