Eu3+-doped Sr2(Al1−xMgx)(Al1−xSi1+x)O7 phosphors: electronic, crystal structures and photoluminescence properties
- 50 Downloads
The union of chemical compositions substitution and spectral controlling is of importance for the discovery of new materials or the implementation of properties optimization. In this work, we employed an effective strategy to regulate crystal structures by chemical unit co-substitution. We applied this strategy to Eu3+-doped Sr2(Al1−xMgx)(Al1−xSi1+x)O7 (0 ≤ x ≤ 1) solid solution phosphor, which was successfully synthesized by high temperature solid state reaction. The crystal structure remained the same group, P-421m, with controlling chemical compositions. The excitation peaks shifted between 263 and 270 nm and emission peaks shifted between 612 and 614 nm with a decreasing Stocks shift in overall tendency. The shift trend was clarified by Crystal Field Theory. The energy band structure and density of states of Sr2Al2SiO7 and Sr2MgSi2O7 were calculated by Density Functional Theory using the generalized gradient approximation. The band gap was also analyzed by diffuse reflectance spectrum as a contrast. The morphology was characterized by field emission scanning electron microscopy. Furthermore, the photoluminescence color of phosphors could be tuned from yellow to orange.
- 22.A.E. Morales, E.S. Mora, U. Pal, Use of diffuse reflectance spectroscopy for optical characterization of un-supported nanostructures. Revista Mexicana de Física 53(5), 18–22 (2007)Google Scholar
- 23.I.P. Sahu, D.P. Bisen, N. Brahme et al., Luminescent properties of R+ doped Sr2MgSi2O7: Eu3+ (R+=Li+, Na+ and K+) orange-red emitting phosphors. J. Mater. Sci.: Mater. Electron. 27(7), 6721–6734 (2016)Google Scholar
- 24.M. Chang, H. Hu, Y. Zhang et al., Core-shell-core heterostructural engineering of Y2O3: Eu3+/MCM-41/YVO4:Eu3+ for enhanced red emission and tunable, broadened-band response to excitation. J. Mater. Sci.: Mater. Electron. 28(21), 16026–16035 (2017)Google Scholar
- 25.D. Singh, V. Tanwar, A.P. Simantilleke et al., Synthesis and enhanced luminescent characterization of SrAl4O7:Eu2+, RE3+(RE=Nd, Dy) nanophosphors for light emitting applications. J. Mater. Sci.: Mater. Electron. 27(5), 5303–5308 (2016)Google Scholar
- 27.D. Singh, S. Sheoran, V. Tanwar et al., Optical characteristics of Eu(III) doped MSiO3 (M=Mg, Ca, Sr and Ba) nanomaterials for white light emitting applications. J. Mater. Sci.: Mater. Electron. 28(4), 3243–3253 (2017)Google Scholar