Preparation and Characterization of Gd 2 O 3 : Er 3+ Nanosphere Particles Combinated with Chitosan Gd 2 O 3 : Er 3+ @CS

• Published in: ECS journal of solid state science and technology Vol. 11; no. 12; p. 126001
• Main Authors: Chau, Pham Thi Minh, Thai, Dang Van, Ha, Vu Thi Thai, Loc, Dinh Xuan, Nguyen, Tien Dai, Van, Bui Hong, Anh, Tran Kim
• Format: Journal Article
• Language: English
• Published: 01.12.2022
• ISSN: 2162-8769; 2162-8777
• DOI: 10.1149/2162-8777/acae03

Nanospherical upconversion luminescence particles (UCLPs) Gd 2 O 3 :Er 3+ and Gd 2 O 3 :Er 3+ @ chitosan (CS) were prepared by step-by-step precipitation and calcination of the available nitrate rare Earth sales and chitosan. The morphology and composition of as-prepared samples were characterized by field emission electron spectroscopy (FESEM) and Fourier transform infrared (FT-IR) spectroscopy. The synthesized UCLPs were non-agglomerate spheres in uniform nanoscale. The quantitative amount of chitosan was well coated with the gain surface of the UCLPs Gd 2 O 3 :Er 3+ to obtain Gd 2 O 3 :Er 3+ @CS nanocomposite. The down-conversion luminescent intensity of Gd 2 O 3 :Er 3+ NSP is lower than Gd 2 O 3 :Er 3+ @CS NSP samples, but luminescent characterizations were non-change. The photoluminescence (PL) of the green emission range of all UCLPs samples with chitosan-coated and -uncoated took the leading position. By using a diode laser excitation with 975 nm of wavelength, the detected intensity of red emission is more remarkably detected than green emissions. The two-photon mechanism for both green and red emissions of nanophosphor was observed. As a result, these might be promising opportunities to conjugate with various bio subjects that could be used in medical applications.