Syntheses, crystal structures and photoluminescence properties of Ca9Y(PO4)5(SiO4)F1.5O0.25:Ln3+ (Ln3+ = Eu3+/Tb3+/Dy3+/Sm3+) phosphors for near-UV white LEDs
作者： Man Liu , Wei Lü , Jiansheng Huo , Baiqi Shao , Yang Feng
DOI: 10.1039/C6RA21254A
关键词:
摘要: A series of single-doped Ca9Y(PO4)5(SiO4)F1.5O0.25:Ln3+ (Ln3+ = Eu3+/Tb3+/Dy3+/Sm3+) phosphors have been prepared via conventional high-temperature solid–state reaction. The structural refinement, photoluminescence properties, and decay curves were studied in detail. Under near-UV excitation, the Ca9Y(PO4)5(SiO4)F1.5O0.25:Eu3+/Tb3+/Dy3+/Sm3+ show characteristic emissions Eu3+ (5D0–7F2, red), Tb3+ (5D4–7F5, green), Sm3+ (4G5/2–6H7/2, Dy3+ (4F9/2–6H13/2, yellow). emission intensities Ca9Y(1−x/z)(PO4)5(SiO4)F1.5O0.25:xEu3+/zSm3+ are maximized when x 0.16 z 0.10, concentration quenching mechanisms both dominated by dipole–dipole interactions. excitation spectra Ca9Y(PO4)5(SiO4)F1.5O0.25:Eu3+/Sm3+ strongest absorption at about 400 nm, which matches well with commercially available near-UV-emitting InGaN-based light emitting-diode (LED) chip. Finally, a red LED was fabricated using present (with composition Ca9Y(PO4)5(SiO4)F1.5O0.25:Eu3+/Sm3+) exhibited high color purity. All results indicate that promising for white LEDs.
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