Issue 2, 2023

Perylene dye@SiO2 core–shell nanoparticles with intense fluorescence

Abstract

PD/CC@SiO2 core–shell nanoparticles (PD: perylene dye, CC: cholecalciferol/vitamin D3) were prepared using a water-based injection method. Specifically, a solution of the PD (fluorescent red (FR), fluorescent orange (FO), fluorescent yellow (FY)), CC, and octyltriethoxysilane (OTES) as a silica precursor in ethanol was injected in water at 70 °C and pH 5. The core–shell nanoparticles exhibited an outer particle diameter of 29 ± 11 nm and an inner core of 12 ± 4 nm. Suspensions (up to 10 mg mL−1) were colloidally highly stable due to the negative surface charging (−40 to −50 mV). CC efficiently allowed disturbing of the π-stacking of the PD, such that, e.g., FR/CC@SiO2 nanoparticles with 10 wt% FR showed intense emission with quantum yields near unity (98%) and without any concentration quenching. In contrast to the freely-dissolved dyes, PD in the nanoparticle core did not show any photobleaching even after 20 hours of continuous UV illumination (280 nm). As proof-of-the-concept, suspensions and thin films were realised showing intense emission from red to yellow. Exemplarily, FR/CC@SiO2 core–shell nanoparticles were examined in detail, including electron microscopy, element mapping, dynamic light scattering, infrared spectroscopy, elemental analysis, UV-Vis spectroscopy, and photoluminescence spectroscopy.

Graphical abstract: Perylene dye@SiO2 core–shell nanoparticles with intense fluorescence

Supplementary files

Article information

Article type
Paper
Submitted
21 Sep 2022
Accepted
02 Dec 2022
First published
03 Dec 2022
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2023,11, 616-621

Perylene dye@SiO2 core–shell nanoparticles with intense fluorescence

M. Rutschmann and C. Feldmann, J. Mater. Chem. C, 2023, 11, 616 DOI: 10.1039/D2TC03981H

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