Improving Quantum Efficiency and Thermal Stability in Blue-Emitting Ba_2–xSr_xSiO₄:Ce³⁺ Phosphor via Solid Solution

Abstract

Ba 1.8−x Sr x SiO 4 :0.1Ce 3+ ,0.1Na + (x = 0−1.8) phosphors were prepared by a high-temperature solid-state reaction. The emission peaks of Ba 1.8−x Sr x SiO 4 :0.1Ce 3+ ,0.1Na + shift from 391 to 411 nm with increasing Sr 2+ content under excitation by a UV light at around 360 nm. Ba 0.4 Sr 1.4 SiO 4 :0.1Ce 3+ ,0.1Na + phosphor exhibits the best performance of luminescence, whose absolute quantum efficiency is 97.2%, and the emission intensity at 150 °C remains 90% of that at room temperature. The effect of replacing Ba 2+ by Sr 2+ on the red shift of the emission band and the increase of quantum efficiency (QE) and thermal stability (TS) was investigated in detail based on the Rietveld refinements, Raman spectra, thermoluminescence, and decay curves, etc. The performance of UV chip-based pc-LEDs indicates that Ba 0.4 Sr 1.4 SiO 4 :0.1Ce 3+ ,0.1Na + can be a promising blue phosphor for white-emitting pc-LEDs.

Pyrophosphate Phosphor Solid Solution with High Quantum Efficiency and Thermal Stability for Efficient LED Lighting

“…For a long time, solid solution design has been considered as an efficient strategy to obtain outstanding phosphors with color tunability, high QE, as well as good thermal stability (Hermus et al, 2017;Bai et al, 2015;Wang et al, 2016;Im et al, 2011). The most widely used approach involves the substitution among Ca, Sr, and Ba because of their similar alkaline earth properties (Ji et al, 2018;Lin et al, 2017). Pyrophosphate phosphor (a-Sr 2 P 2 O 7 :Eu 2+ ) has been recognized as an excellent blue-emitting phosphor.…”

Enhanced photoluminescence and energy transfer performance of Y3Al4GaO12:Mn4+,Dy3+ phosphors for plant growth LED lights

“…Therefore, solid solution treatment can improve the luminescence performance and thermal stability. [28][29][30] There are many conditions for solid solution formation, such as similar ion radius size, alike crystal structure or chemical formula, similarity of ion electronegativity, and the same of ion value. For example, Ca 14 Al 10 Zn 6 O 35 31 and Ca 14 Ga 10 Zn 6 O 35 32 has the similar structure, Mn 4+ -doped Ca 14 Al 10 Zn 6 O 35 phosphors show far-red emitting, and the luminescence properties can be improved by substituting Ga 3+ for Al 3+ ion.…”

Tunable lanthanide/transition metal ion‐doped novel phosphors for possible application in w‐LEDs: a review

“…A series of Ba 1.8– x Sr x SiO 4 :0.1Ce 3+ ,0.1Na + ( x = 0–1.8) was synthesized by Ji et al . Interestingly, the emission peaks of these phosphors could be tuned by varying the Sr 2+ concentration under 360 nm UV excitation.…”