Experimentally Observed Reverse Intersystem Crossing‐Boosted Lasing,Angewandte Chemie International Edition

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Experimentally Observed Reverse Intersystem Crossing‐Boosted Lasing
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-08-13 , DOI: 10.1002/anie.202008940
Zhonghao Zhou _{1,

2} , Chan Qiao _{1,

2} , Kang Wang ₁ , Lu Wang ₃ , Jie Liang _{1,

2} , Qian Peng ₄ , Zhiyou Wei _{2,

5} , Haiyun Dong ₁ , Chuang Zhang ₁ , Zhigang Shuai ₃ , Yongli Yan ₁ , Yong Sheng Zhao _{1,

2}

Affiliation

Thermally activated delayed‐fluorescent (TADF) materials are anticipated to overcome triplet‐related losses towards electrically driven organic lasers. Thus far, contributions from triplets to lasing have not yet been experimentally demonstrated owing to the limited knowledge about the excited‐state processes. Herein, we experimentally achieve reverse intersystem crossing (RISC)‐boosted lasing in organic microspheres with uniformly dispersed TADF emitters. In these materials, triplets are continuously converted to radiative singlets through RISC, giving rise to reduced losses in stimulated emission. The involvement of regenerated singlets in population inversion results in a thermally activated lasing; that is, the lasing intensity increases with increasing temperature, accompanied by accelerated depletion of the excited‐state population. Benefiting from the suppression of triplet accumulations by RISC processes, a high‐repetition‐rate microlaser was achieved.

中文翻译：

实验观察到的反向系统间交叉提升激光

热活化延迟荧光（TADF）材料有望克服与三重态相关的电驱动有机激光器损耗。迄今为止，由于对激发态过程的了解有限，三重态对激光的贡献尚未得到实验证明。在这里，我们通过实验来实现在具有均匀分散的TADF发射器的有机微球体中实现反向系统间交叉（RISC）增强的激光发射。在这些材料中，三重态通过RISC连续转换为辐射单重态，从而减少了受激发射的损失。再生单线态参与种群反转会导致热激活激光。也就是说，激光强度随着温度的升高而增加，并伴随着激发态人口的加速消耗。

更新日期：2020-08-13

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