Document Type

Article

Publication Date

6-2020

Abstract

Investigations of structural defects and their associated impact on the optical properties of optical materials are essential expediencies because different methods are involved in the preparation of those materials for display applications. Lanthanide ion doping is a simple structural probing strategy that facilitates the challenges of identifying the structural defects. Pure and terbium (Tb3+) doped Ca2SiO4 (C2S) particles were prepared using Pechini (C2SP) and hydrothermal methods (C2SH). From SEM images, it is observed that the Tb3+ doped C2SP particles were highly agglomerated, more than the C2SH particles. The TEM study confirmed that the particle size decreased for C2SH prepared at the high hydrothermal temperatures of 180 and 200 °C (C2S:180H and C2S:200H). Fluorescence emission quenching occurred for Tb3+ doped C2S:180H and C2S:200H. The emission intensity was high for Tb3+ doped C2SH prepared at 140 °C compared to Tb3+ doped C2SP, C2S:180H and C2S:200H. The changes in the O2p orbitals, associated with the upper-level valence band spectra of the tetrahedral silicate of pure C2SP and C2S:180H, were experimentally evaluated in the X-ray photoelectron spectroscopy (XPS)-valence band spectra. The symmetry lowering owing to the distortion in the silicate unit quenched the emission, which was confirmed by XPS-valence band spectra and Tb3+ emission lines. This study suggests that the Pechini method is more suitable to prepare the Tb3+ doped C2S phosphors compared to the hydrothermal method, particularly at high temperature for solid state display and scintillator applications.

Comments

Original published version available at https://doi.org/10.1016/j.jsamd.2020.03.001

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

First Page

250

Last Page

255

Publication Title

Journal of Science: Advanced Materials and Devices

DOI

10.1016/j.jsamd.2020.03.001

Included in

Chemistry Commons

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.