Abstract
Titania particles doped with various concentrations of Erbium were synthesized by the sol-gel method followed by different heat treatments. The shape and the grain growth of the particles were noticeably affected by the concentration of Erbium and the heat treatment conditions. An infrared emission at 1530 nm, as well as green and red up-conversion emissions at 550 and 670 nm, were observed under excitation at 976 nm from all of the synthesized particles. The emission spectra and lifetime values appeared to be strongly influenced by the presence of the different crystalline phases. This work presents important guidelines for the synthesis of functional Er3+-doped titania particles with controlled and tailored spectroscopic properties for photonic applications.
Highlights
Titania (TiO2 ) is one of the most intensively studied materials owing to a series of interesting properties, such as its semiconducting behavior, low toxicity, biocompatibility, high chemical stability, and simple and economic production [1,2,3]
The thermogravimetric analysis (TGA) curve highlights the different stages of the water removal, showing that almost no weight losses occur at temperatures higher than 850 ◦ C
The samples used for both the emission and lifetime measurements were pressed to form flat disks and placed between two transparent pure silica glasses. Both undoped and Er2 O3 -doped TiO2 particles were successfully synthesized by the sol-gel technique and their morphological, structural, and luminescence properties were thoroughly investigated as a function of the calcination temperature and the Er2 O3 concentration
Summary
Titania (TiO2 ) is one of the most intensively studied materials owing to a series of interesting properties, such as its semiconducting behavior, low toxicity, biocompatibility, high chemical stability, and simple and economic production [1,2,3]. Red and green up-conversion emissions [12,13]
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