Rational Molecular Design for Achieving Persistent and Efficient Pure Organic Room-Temperature Phosphorescence
Rational Molecular Design for Achieving Persistent and Efficient Pure Organic Room-Temperature Phosphorescence
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合理的分子设计实现持久高效的纯有机室温磷光
DOI：
10.1016/j.chempr.2016.08.010
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发表时间：
2016-10-13
期刊：
影响因子：
23.5
通讯作者：
Tang, Ben Zhong
中科院分区：
文献类型：
--
作者：
Zhao, Weijun;He, Zikai;Tang, Ben Zhong
通过分子设计来操纵纯有机室温荧光粉的发射性能是有吸引力的，但也是具有挑战性的。人们已经做出了巨大的努力来调节它们的聚集行为，以抑制非辐射衰减，从而实现高效的发光和长寿命。然而，成功是有限的。为了达到这一目标，我们提出了一种基于内在分子结构工程的合理设计原则。对分子轨道的综合研究表明，(n，pi*)和(pi，pi*)杂化构型的激发态是理想的。通过对芳基苯酮中芳香族亚基的剪裁，可以有效地调节三重态激子的能级和轨道特征。我们的实验数据表明，在环境条件下可以实现一系列全彩色纯有机荧光粉，其寿命(高达0.23 S)和效率(高达36.0%)都是平衡的，证明了我们的指导性设计原则的有效性。
Manipulation of the emission properties of pure organic room-temperature phosphors through molecular design is attractive but challenging. Tremendous efforts have been made to modulate their aggregation behaviors to suppress nonradiative decay in order to achieve efficient light emission and long lifetimes. However, success has been limited. To attain such a goal, here we present a rational design principle based on intrinsic molecular-structure engineering. Comprehensive investigations on the molecular orbitals revealed that an excited state with hybrid (n,pi*) and (pi,pi*) configurations in appreciable proportion is desired. Tailoring the aromatic subunits in arylphenones can effectively tune the energy level and the orbital feature of the triplet exciton. Our experimental data reveal that a series of full-color pure organic phosphors with a balanced lifetime (up to 0.23 s) and efficiency (up to 36.0%) can be realized under ambient conditions, demonstrating the validity of our instructive design principle.