Molecules capable of producing zero-field circularly polarized phosphorescence (CPP) are highly valuable for chiroptoelectronic applications that rely on triplet exciton. However, the paucity of tractable molecular design rules for obtaining CPP emission has inhibited full utilization. We report amplification of CPP by the formation of helical co-assemblies consisting of achiral square planar cycloplatinated complexes and small fractions of homochiral cycloplatinated complexes. The latter has a unique Pfeiffer effect during the formation of superhelical co-assemblies, enabling versatile chiroptical control. Large dissymmetry factors in electronic absorption (g_abs, 0.020) and phosphorescence emission (g_lum, 0.064) are observed from the co-assemblies. These values are two orders of magnitude improved relative to those of individual molecules. In addition, photoluminescence quantum yields (PLQY) also increase by a factor of ten. Our structural, photophysical, and quantum chemical investigations reveal that the chiroptical amplification is attributable to utilization of both the magnetically allowed electronic transition and asymmetric coupling of excitons. The strategy overcomes the trade-off between g_lum and PLQY which has frequently been found for previous molecular emitters of circularly polarized luminescence. It is anticipated that our study will provide new insight into the future research for the exploitation of the full potential of CPP.

中文翻译：

---

铂（ii）配合物的组装体的放大的圆偏振磷光†

能够产生零场圆偏振磷光（CPP）的分子对于依赖三重态激子的人体电子学应用非常有价值。但是，缺乏获得CPP排放的易于处理的分子设计规则，已抑制了其充分利用。我们报告通过由非手性方形平面环铂络合物和小部分的同手性环铂络合物组成的螺旋共聚体的形成，对CPP进行扩增。后者在超螺旋共同装配的形成过程中具有独特的菲佛效应，可实现多功能的按摩控制。电子吸收（g _abs，0.020）和磷光发射（g _lum（0.064），则可从协同装配中观察到。相对于单个分子，这些值提高了两个数量级。另外，光致发光量子产率（PLQY）也增加了十倍。我们的结构，光物理和量子化学研究表明，手性放大可归因于利用磁允许的电子跃迁和激子的不对称耦合。该战略克服之间的权衡摹_LUM和PLQY它经常被发现圆偏振发光的分子以前的排放。可以预期，我们的研究将为开发CPP的全部潜力提供对未来研究的新见解。