Abstract
The present study reports the synthesis, crystallographic structure and optical properties of manganese (Mn2+) doped zinc silicate (Zn2SiO4) nanoparticle phosphors prepared by sol–gel and combustion methods. For samples prepared by sol–gel method, the X-ray diffraction results showed phase transformation from amorphous to α-phase Zn2SiO4 due to annealing temperatures at 600 °C to 1100 °C, whereas for combustion samples an admixture of highly crystalline β-phase and hexagonal wurtzite structure of ZnO was observed at annealing temperature of 600 °C. Photoluminescence spectra with Mn2+ concentrations ranging from 0.015–0.09 mol% were compared for two methods. Emission band assigned to the 4T1(4G)→6A1(6S) electronic transition of Mn2+ was observed with maximum intensity at ~573 nm for combustion samples and ~532 nm for sol–gel samples upon UV-excitation by a Xenon lamp. Furthermore, the photoluminescence decay curves of annealed Zn2SiO4:Mn2+ samples were observed to be bi-exponential. The fast and slow decay components are due to the pair or cluster formation and isolated ions at higher doping concentration, respectively.
Original language | English |
---|---|
Pages (from-to) | 74-82 |
Number of pages | 9 |
Journal | Journal of Luminescence |
Volume | 179 |
DOIs | |
Publication status | Published - 1 Nov 2016 |
Externally published | Yes |
Keywords
- Amorphous materials
- Combustion
- Luminescence
- Phosphors
- Sol–gel chemistry
- X-ray diffraction
ASJC Scopus subject areas
- Biophysics
- Atomic and Molecular Physics, and Optics
- General Chemistry
- Biochemistry
- Condensed Matter Physics