Preparation and luminescence performance of Ba3Y2B6O15:Dy3+phosphor
Developing novel single-phase phosphors and exploring their applications in light emitting diode devices is a current research focus.In this study,Ba3Y2B6O15:Dy3+(BYB:Dy)phosphors were synthesized via the high-temperature solid-state method with multiple-step firings,and their structural characteristics and luminescence properties were investigated.The results of X-ray diffraction and ion doping radius ratio calculations demonstrate that Dy3+ions can successfully incorporate into the main lattice of Ba3Y2B6O15 without generating impurity phases,and substitute the sites of Y3+,which leads to larger cell parameters due to the fact that the radius of Dy3+is larger than that of Y3+.The fluorescence spectroscopy results indicate that the BYB:Dy phosphors can be effectively excited by ultraviolet light.When excited by the optimal wavelength(351 nm),broad peaks at 409 nm and sharp peaks at 481,580,and 678 nm are respectively generated;the broad peaks originated from the oxygen interstitial(Oi)defects during the synthesis of the BYB matrix belong to the blue emission band,while the sharp ones from the 4F9/2→6HJ/2(J=15,13,11)energy level transitions of Dy3+correspond to the blue and yellow emission bands.The chromaticity coordinates show that the luminescence of the phosphors belongs to the blue-white light region.Due to the highly symmetric crystal field environment and close-packing polyhedra of the BYB matrix,the BYB:Dy phosphors exhibit excellent luminescence performance and stability,supplement the blue emission and enhance the color purity of the phosphors,thereby having a promising application prospect in the field of white light emitting diodes.
BYB:Dy phosphorhigh temperature solid-state methodstructural featuresluminescence performancelight emitting diode
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