1. Crystal Field Engineering Inducing Transformation from Narrow Band of Eu 3+ to Broadband of Eu 2 .
- Author
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Mao A, Guo Y, Zhou W, Lv P, Wang X, and Lai L
- Abstract
The complete transformation from narrow peak emission of Eu
3+ to broadband emission of Eu2+ was first realized in La1- x Sr2+ x Al1- x Six O5 :Eu series solutions relying on crystal field engineering and adjustment of synthesis parameters. The original red phosphor La0.97 Sr2 AlO5 :0.03Eu3+ peaks at 703 nm originated from5 D0 →7 F4 transition of Eu3+ under 395 nm excitation. As the x value regularly increased, Sr2 SiO4 -type green phosphor La0.17 Sr2.8 Al0.2 Si0.8 O5 :0.03Eu2+ was synthesized at x = 0.8, which can be efficiently excited by UV/blue light chips. Moreover, when x > 0.975, Sr3 SiO5 :Eu2+ type broadband orange phosphor Sr2.945 Al0.025 Si0.975 O5 :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.- Published
- 2024
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