Effect of BaO Content on the Photoluminescence Properties of Mn<sup>2+</sup> and Eu<sup>2+</sup>-Codoped Sr<sub>3−<i>x</i></sub>Ba<i><sub>x</sub></i>MgSi<sub>2</sub>O<sub>8</sub> Phosphors
In this study, Mn<sup>2+</sup> and Eu<sup>2+</sup>-codoped Sr<sub>3−<i>x</i></sub>Ba<i><sub>x</sub></i>MgSi<sub>2</sub>O<sub>8</sub> (<i>x</i> = 0–1.5) phosphors were synthesized at 1400 °C un...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
|
| Series: | Inorganics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6740/13/6/187 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | In this study, Mn<sup>2+</sup> and Eu<sup>2+</sup>-codoped Sr<sub>3−<i>x</i></sub>Ba<i><sub>x</sub></i>MgSi<sub>2</sub>O<sub>8</sub> (<i>x</i> = 0–1.5) phosphors were synthesized at 1400 °C under a reducing atmosphere composed of 5% H<sub>2</sub> and 95% N<sub>2</sub> to produce materials with blue light emission. The resulting powders were characterized using several analytical techniques: X-ray diffraction (XRD) was employed to identify the crystalline phases, scanning electron microscopy (SEM) was used to observe the microstructure, and photoluminescence excitation (PLE) and emission (PL) spectra were measured using a fluorescence spectrophotometer. The results revealed several key findings. XRD analysis showed that the Sr<sub>3</sub>MgSi<sub>2</sub>O<sub>8</sub> (Sr<sub>3−<i>x</i></sub>Ba<i><sub>x</sub></i>MgSi<sub>2</sub>O<sub>8</sub>) phase coexisted with secondary phases of Sr<sub>2</sub>SiO<sub>4</sub> and Sr<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub>. SEM observations indicated that the synthesized powders exhibited a distinctive needle-like structure anchored on the surfaces of the particles. The PL and PLE intensities increased sharply as the BaO content increased from <i>x</i> = 0 to <i>x</i> = 0.6, followed by a more gradual increase, reaching a peak at <i>x</i> = 1.2. Additionally, as the value of <i>x</i> increased, the wavelengths corresponding to maximum PL and PLE intensities exhibited a blue shift, moving to shorter wavelengths. Further investigation focused on the excitation behavior by replotting the PLE spectra using energy (eV) as the x-axis. A Gaussian fitting function was applied to deconvolute the excitation bands, enabling an in-depth analysis of how compositional variations influenced the Stokes shift. |
|---|---|
| ISSN: | 2304-6740 |