Abstract

Special attention has been paid to the organic afterglow materials (OAM) for their fascinating properties. However, poor stability at air and complicated structure design hinder the development of OAM. Herein, sol-gel, a facile and simple technique, is employed to synthesize a series of organic/inorganic hybrid nanocomposites (N1/SiO₂, N2/SiO₂, and N3/SiO₂) by covalently linking three common aryl imides with crosslinked silica skeleton. These nanomaterials show excitation wavelength-dependent and colorful (yellow, red and green) afterglow of organic imides with long lifetime up to 1.1 s at air. Interestingly, the ultralong phosphorescence is ultrastable under various conditions: water, high temperature, UV irradiation and in vivo, due to the protection of inorganic silica. In particularly, heating to 500 °C does not quench the afterglow of organic luminophore in nanocomposites, but forms new ultralong phosphorescence originated from space-conjugation of silica and carbonyl. The afterglow nanomaterials display huge advantages in the applications of advanced anti-counterfeiting and bioimaging.

中文翻译：

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非晶态纳米复合材料中有机发光体产生的超稳定和彩色的余辉：先进的防伪和体内成像应用

摘要

由于有机余辉材料（OAM）的引人入胜的性能而受到特别关注。但是，空气稳定性差和结构设计复杂会阻碍OAM的发展。在本文中，溶胶-凝胶是一种简便易行的技术，它通过将三个常见的芳基酰亚胺与交联键共价连接来合成一系列有机/无机杂化纳米复合材料（N1 / SiO ₂，N2 / SiO ₂和N3 / SiO ₂）二氧化硅骨架。这些纳米材料显示出与激发波长相关的彩色有机亚胺余辉，并具有彩色（黄色，红色和绿色）余辉，在空气中的寿命长达1.1 s。有趣的是，超长磷光在各种条件下都是超稳定的：水，高温，紫外线照射和体内，由于保护了无机二氧化硅。特别地，加热到500°C不会淬灭纳米复合材料中有机发光体的余辉，但是会形成新的超长磷光，其起源于二氧化硅和羰基的空间共轭。余辉纳米材料在先进的防伪和生物成像应用中显示出巨大的优势。