Synthesis and photoluminescence properties of high-Ba3P4O13:Eu2+-A broadband yellow-emitting phosphor for near ultraviolet white light-emitting diodes

We have synthesized and investigated a series of yellow-emitting high-Ba3P4O13:Eu2+ phosphors, showing an extreme broad band at around 587 nm, with a full width at half maximum of about 175 nm, which is attributed to the 5d-4f transition of Eu2+ under near ultraviolet excitation. This phosphor shows good absorption in the near ultraviolet range and nearly no absorption in the blue region. The concentration quenching and the fluorescence lifetime of Eu2+, as well as the temperature-dependent photoluminescence have also been studied. Moreover, a white light with chromaticity coordinates of (0.364, 0.357) and color temperature of 4354K was obtained by blending the yellow-emitting high-Ba3P4O13:Eu2+ and the commercial blue-emitting BaMgAl10O17:Eu2+ phosphor. These results indicate that high-Ba3P4O13:Eu2+ has potential applications in the dual-color-phosphor-converted white light emitting diodes. (C) 2016 Elsevier Ltd. All rights reserved.