Organic Nanocrystals with Bright Red Persistent Room-Temperature Phosphorescence for Biological Applications
Organic Nanocrystals with Bright Red Persistent Room-Temperature Phosphorescence for Biological Applications
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用于生物应用的具有亮红色持久室温磷光的有机纳米晶体
DOI：
10.1002/anie.201705945
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发表时间：
2017-09-25
影响因子：
16.6
通讯作者：
Liu, Bin
中科院分区：
文献类型：
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作者：
Fateminia, S. M. Ali;Mao, Zhu;Liu, Bin
纯有机材料的持久室温磷光（RTP）因其独特的光学性质而引起人们的极大关注。具有亮红色持久RTP的有机材料的设计仍然具有挑战性。在这里，我们报告了一种新的设计策略，实现高亮度和长寿命的红色发射RTP分子，这是基于在分子中的混合单元之间引入烷氧基间隔基。间隔物在结晶期间提供容易的Br-H键形成，这也促进分子间电子耦合以有利于持久的RTP。由于大多数RTP化合物必须被限制在刚性环境中以淬灭用于明亮磷光发射的非辐射弛豫途径，因此纳米晶化不仅用于使分子刚性化，而且还为生物医学应用提供所需的尺寸和水分散性。
Persistent room-temperature phosphorescence (RTP) in pure organic materials has attracted great attention because of their unique optical properties. The design of organic materials with bright red persistent RTP remains challenging. Herein, we report a new design strategy for realizing high brightness and long lifetime of red-emissive RTP molecules, which is based on introducing an alkoxy spacer between the hybrid units in the molecule. The spacer offers easy Br-H bond formation during crystallization, which also facilitates intermolecular electron coupling to favor persistent RTP. As the majority of RTP compounds have to be confined in a rigid environment to quench nonradiative relaxation pathways for bright phosphorescence emission, nanocrystallization is used to not only rigidify the molecules but also offer the desirable size and water-dispersity for biomedical applications.