New SrAl2B2O7:Eu2+, Mn2+ phosphors for white light-emitting diodes

A series of Eu2+ and Mn2+ co-doped SrAl2B2O7 phosphors were prepared by solid-state reaction method. X-ray powder diffraction (XRD) and photoluminescence excitation and emission were employed to characterize the phosphors. The results show that energy transfers between Eu2+and Mn2+ ions. As the content of Ca2+ ions in CaxSr0.92−xAl2B2O7:Eu2+0.06, Mn2+0.02 phosphors increased, the CIE coordinates decreased and close to the white color standard mandated by the National Television Standard Committee (NTSC). Meanwhile, a white LED (light-emitting diode) was fabricated by combining the Ca0.5Sr0.42Al2B2O7:Eu2+0.06, Mn2+0.02 phosphors with a 370 nm InGaN chip. The color coordinate of the fabricated white LED was also close to the white color standard, indicating that the Ca0.5Sr0.42Al2B2O7:Eu2+0.06, Mn2+0.02 phosphor is a promising single-host phosphor that can be used in white LEDs.

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► New SrAl2B2O7:Eu2+, Mn2+ phosphors were prepared at low temperature (900 °C).
► The fabricated white LED exhibits well CIE chromaticity coordinates.
► SrAl2B2O7:Eu2+, Mn2+ phosphor is a promising phosphor for white LED.