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The complete transformation from narrow peak emission of Eu3+to broadband emission of Eu2+was first realized in La1–xSr2+xAl1–xSixO5:Eu series solutions relying on crystal field engineering and adjustment of synthesis parameters. The original red phosphor La0.97Sr2AlO5:0.03Eu3+peaks at 703 nm originated from 5D0→7F4transition of Eu3+under 395 nm excitation. As the xvalue regularly increased, Sr2SiO4-type green phosphor La0.17Sr2.8Al0.2Si0.8O5:0.03Eu2+was synthesized at x= 0.8, which can be efficiently excited by UV/blue light chips. Moreover, when x> 0.975, Sr3SiO5:Eu2+type broadband orange phosphor Sr2.945Al0.025Si0.975O5:0.03Eu2+with excellent thermal stability (91.3% peak intensity at 150 °C) was obtained. Variations in the crystal structure, phase, and luminescence properties were studied in detail. We hope this work can provide a reference that solid solution between distinct but structurally related systems is a strategy to explore the possible phosphors for phosphor-converted light-emitting diodes.

Ba3-xSi6O9N4:xEu2+ (0.03 [?] x [?] 0.10) phosphors were successfully synthesized by a solid state reaction method. Under electron beam excitation, the cathodoluminescence intensity reached a maximum at x = 0.07. The corresponding emission spectrum peaked at [?]493 nm (full-width at half maximum [?]46 nm) with CIE coordinate of (0.101, 0.418). The results show that Ba2.93Si6O9N4: 0.07Eu2+ phosphor exhibits high brightness, high color purity, and a higher thermal stability compared to the commercial green Topstar, LMS520B phosphor, which indicates that it could be a candidate for field-emission displays (FEDs).

Ba3-xSi6O9N4:xEu2+(0.03 ≤ x≤ 0.10) phosphors were successfully synthesized by a solid state reaction method. Under electron beam excitation, the cathodoluminescence intensity reached a maximum at x= 0.07. The corresponding emission spectrum peaked at ∼493 nm (full-width at half maximum ≈46 nm) with CIE coordinate of (0.101, 0.418). The results show that Ba2.93Si6O9N4: 0.07Eu2+phosphor exhibits high brightness, high color purity, and a higher thermal stability compared to the commercial green Topstar, LMS520B phosphor, which indicates that it could be a candidate for field-emission displays (FEDs).