Flexible crystals with plasticity and elasticity that exhibit phosphorescent emission are quite rare yet highly significant for their potential applications. In our study, we present an example of such flexible (both elastic and plastic) organic crystals based on 1,2-bis(3-bromophenyl)-ethane-1,2-dione (BBPED), which demonstrates a lifetime of 0.504 ms (517 nm) and a quantum efficiency of 26.12 % at room temperature. These crystals exhibit reversible elastic properties in both their original and twisted states, and possess optical waveguide properties with minimal optical loss coefficients in the range of 0.26–0.48 dB/mm. In addition, the above crystals exhibit phosphorescence to phosphorescence blueshift under hydrostatic pressure, whereas mechanical grinding produces a phosphorescence to phosphorescence redshift phenomenon. Theoretical calculations indicate that the alterations in molecular conformation and intermolecular interactions both contribute to the piezochromic phenomenon. In conclusion, this work provides a new approach to the design of multifunctional phosphorescent molecular crystals with flexible characteristics.

具有可塑性和弹性且表现出磷光发射的柔性晶体非常罕见，但对其潜在应用非常重要。在我们的研究中，我们展示了基于 1,2-双(3-溴苯基)-乙烷-1,2-二酮 ( BBPED )的此类柔性（弹性和塑性）有机晶体的示例，其寿命为 0.504 毫秒（517 nm），室温下量子效率为 26.12%。这些晶体在原始状态和扭曲状态下均表现出可逆弹性特性，并具有光波导特性，最小光损耗系数在 0.26–0.48 dB/mm 范围内。另外，上述晶体在静水压力下表现出磷光到磷光蓝移，而机械研磨则产生磷光到磷光红移现象。理论计算表明，分子构象的改变和分子间相互作用都有助于压致变色现象。总之，这项工作为设计具有灵活特性的多功能磷光分子晶体提供了一种新方法。