Ultralong and efficient phosphorescence from silica confined carbon nanodots in aqueous solution. (October 2020)

• Record Type: Journal Article
• Authors: Liang, Ya-Chuan; Gou, Shan-Shan; Liu, Kai-Kai; Wu, Wen-Jie; Guo, Chen-Zi; Lu, Si-Yu; Zang, Jin-Hao; Wu, Xue-Ying; Lou, Qing; Dong, Lin; Gao, Yan-Feng; Shan, Chong-Xin
• Is Part Of: Nano today. Volume 34(2020)
• Publication Date: 2020-10
• Subjects: Water-soluble -- Carbon nanodots -- Phosphorescence -- Afterglow imaging; Nanotechnology -- Periodicals; Nanosciences -- Périodiques; 620.505
• DOI: 10.1016/j.nantod.2020.100900
• Languages: English
• ISSNs: 1748-0132

Abstract

Graphical abstract: Herein, ultralong and efficient phosphorescence has been achieved from silica confined carbon nanodots (CNDs) in acqueous solution, and the lifetime and phosphorescence quantum yield of the CNDs are 1.86 s and 11.6 %, both of which are the best values ever reported for water-soluble phosphorescent nanoparticles. In terms of the efficient phosphorescence, in vivo/vitro afterglow imaging has also been demonstrated, which addresses demonstration of CNDs in afterglow bioimaging. Highlights: Water-soluble phosphorescent CNDs with world-record lifetime and quantum yield of 1.86 s and 11.6% have been achieved. The silica layer increases the stability of the triplet excitons in CNDs. In vivo / vitro afterglow imaging has been demonstrated with our proposed CNDs. Abstract: Water-soluble phosphorescent nanoparticles are highly desirable for biomedical applications. However, the phosphorescence of nanoparticles is usually quenched in aqueous solutions due to the nonradiative deactivation of triplet excitons by the oxygen in water, thus it is a huge challenge to realize water-soluble phosphorescent nanoparticles. Herein, ultralong and efficient phosphorescence has been achieved from water-soluble carbon nanodots (CNDs) by confine CNDs in a nanospace. Silica capsulation layer is used to ensure the solublity of the CNDs, isolate the CNDs from the surrounding oxygen in the aqueous solution. Furthermore, the motion and vibration of covalent bonds in the CNDs are limited. In this way, the nonradiative deactivation rates of triplet excitons has been decreased, and efficient phosphorescence is achieved from water-soluble CNDs. The lifetime and phosphorescence quantum yield of the CNDs are 1.86 s and 11.6 %, both of which are the best values ever reported for water-soluble phosphorescent nanoparticles. In terms of the efficient phosphorescence of the CNDs in aqueous solution, in vivo/vitro afterglow imaging is also been demonstrated.