Che Weilong, Gong Yanbin, Tu Liangjing, Han Mengmeng, Li Xiaoning, Xie Yujun, Li Zhen
Institute of Molecular Aggregation Science, Tianjin University, Tianjin, 300110, P. R. China.
Phys Chem Chem Phys. 2020 Sep 30;22(37):21445-21452. doi: 10.1039/d0cp02881a.
The development of organic room-temperature phosphorescence (RTP) is accompanied by opportunities and challenges. RTP from crystal polymorphism has aroused much attention, due to the significant different photophysical characteristics and intermolecular packings found in the same molecule with different crystal phases. Herein, we report three organic molecules BP-o-BO, BP-m-BO, and BP-p-BO, in which two crystal polymorphisms of BP-p-BO are successfully cultivated with different emission properties. BP-p-BO-A exhibits bright cyan photoluminescence (PL) with a quantum yield of 11.3% and a distinct RTP with a lifetime of 17.1 ms, which is much higher than the deep blue PL of BP-p-BO-B (6.9%) and the corresponding RTP lifetime of 3.3 ms. Crystal structure analyses indicate that the different emission properties can be ascribed to the different intermolecular packing, further demonstrating the essential role of molecular packing in the designing of RTP materials.
有机室温磷光（RTP）的发展既伴随着机遇也面临着挑战。来自晶体多晶型的RTP引起了广泛关注，这是因为在具有不同晶相的同一分子中发现了显著不同的光物理特性和分子间堆积方式。在此，我们报道了三种有机分子BP-o-BO、BP-m-BO和BP-p-BO，其中成功培养出了具有不同发光特性的BP-p-BO的两种晶体多晶型。BP-p-BO-A呈现出明亮的青色光致发光（PL），量子产率为11.3%，以及具有17.1 ms寿命的明显RTP，这远高于BP-p-BO-B的深蓝色PL（6.9%）以及相应的3.3 ms的RTP寿命。晶体结构分析表明，不同的发光特性可归因于不同的分子间堆积，进一步证明了分子堆积在RTP材料设计中的关键作用。
