Highly Efficient Persistent Room-Temperature Phosphorescence from Heavy Atom-Free Molecules Triggered by Hidden Long Phosphorescent Antenna.,Advanced Materials

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Highly Efficient Persistent Room-Temperature Phosphorescence from Heavy Atom-Free Molecules Triggered by Hidden Long Phosphorescent Antenna.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-06-28 , DOI: 10.1002/adma.202001348
Indranil Bhattacharjee ₁ , Shuzo Hirata ₁

Affiliation

Persistent (lifetime > 100 ms) room‐temperature phosphorescence (p RTP) is important for state‐of‐the‐art security and bioimaging applications. An unclear relationship between chromophores and physical parameters relating to p RTP has prevented obtaining an RTP yield of over 50% and a lifetime over 1 s. Here highly efficient p RTP is reported under ambient conditions from heavy atom‐free chromophores. A heavy atom‐free aromatic core substituted with a long‐conjugated amino group considerably accelerates the phosphorescence rate independent of the intramolecular vibration‐based nonradiative rate from the lowest excited triplet state. One of the designed heavy atom‐free dopant chromophores presents an RTP yield of 50% with a lifetime of 1 s under ambient conditions. The afterglow brightness under strong excitation is at least 10⁴ times stronger than that of conventional long‐persistent luminescence emitters. Here it is shown that highly efficient p RTP materials allow for high‐resolution gated emission with a size of the diffraction limit using small‐scale and low‐cost photodetectors.

中文翻译：

由隐藏的长磷光天线触发的重无原子分子的高效持久室温磷光。

持久的（生命周期> 100 ms）室温磷光（p RTP）对于最新的安全性和生物成像应用至关重要。发色团和与p RTP有关的物理参数之间的不清楚的关系阻止了获得超过50％的RTP产率和超过1 s的寿命。这里高效p据报道，RTP在环境条件下是由无原子的重发色团形成的。从最低的激发三重态起，长链共轭氨基取代的重原子无芳族核可大大提高磷光速率，而与分子内基于振动的非辐射速率无关。一种设计的无重原子掺杂发色团在室温下的RTP产率为50％，寿命为1 s。在强激发下的余辉亮度至少是传统长持续发光发射器的余辉亮度的10 ⁴倍。此处显示了高效的p RTP材料可以使用小型和低成本光电探测器实现具有衍射极限大小的高分辨率门控发射。

更新日期：2020-08-04

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