Europium-activated barium/strontium silicates for near-UV light emitting diode applications

Red, Green, and Blue Photoluminescence of Ba2SiO4:M (M = Eu3+, Eu2+, Sr2+) Nanophosphors

“…However, the emission spectra recorded for these two excitation energies are both centered at 19,706 cm −1 and present similar values of full width at half maximum (FWHM) of 2403 cm −1 and 2413 cm −1 for the spectra excited at, respectively, 27,855 cm −1 and 37,037 cm −1 (Figure 6a). The maximum of the emission spectrum at 19,706 cm −1 is comparable to the value of 19,531 cm −1 , described in the literature for Ba 2 SiO 4 :Eu 2+ particles [8]. In this case, the minor deviation of approximately 200 cm −1 may be explained by the different doping concentrations [4] of 1% in our work and of 3% in the work of Han et al [8].…”

“…The maximum of the emission spectrum at 19,706 cm −1 is comparable to the value of 19,531 cm −1 , described in the literature for Ba 2 SiO 4 :Eu 2+ particles [8]. In this case, the minor deviation of approximately 200 cm −1 may be explained by the different doping concentrations [4] of 1% in our work and of 3% in the work of Han et al [8]. …”

“…This is remarkable in view of the importance of that phosphor. In these works, the crystal sizes are generally larger than 0.5 μm, prepared by applying laborious and time-consuming methods as sol-gel synthesis, spray pyrolysis and vapor phase techniques [8,9]. Due to the low starting temperature and the short calcination time, combustion synthesis is an energy-saving method, usually applied for preparation of highly crystalline nano-compounds, e.g., complex oxide ceramics such as aluminates, ferrites and chromites [10,11,12].…”

“…In addition, the size of the Ba 2 SiO 4 NPs produced applying the combustion synthesis is smaller than the size of the ones prepared with the aid of other synthesis methods [8,9]. Undoped barium orthosilicate nanoparticles as well as those doped with Eu 3+ and Sr 2+ have never been produced or investigated before.…”

Synthesis and luminescence characterization of Pr3+ doped Sr1.5Ca0.5SiO4 phosphor

“…Xi Chen et al discussed about the characterization and application of Eu 3+ and Tb 3+ doped Sr 1.5 Ca 0.5 SiO 4 matrices [4]. But the singly doped host matrices with high luminescence efficiency are of great importance as we can get very intense, highly accurate primary colors as well as white light, which found application in phosphor conversion Light Emitting Diodes [5][6][7][8][9]. Among the alkaline earth orthosilicate hosts Sr 1 .…”