Preparation and photoluminescence properties of LaBMoO6:Dy3+ yellow-emitting phosphor for LEDs
Tóm tắt
LaBMoO6:Dy3+ phosphor is successfully synthesized in the air by the solid-state reaction method. The luminescence properties and crystal structures are researched. LaBMoO6:Dy3+ phosphor with excitation at 388, 398, 426, and 451 nm emits yellow light. The emission spectrum of LaBMoO6:Dy3+ phosphor in the range of 450–780 nm contains four emission bands peaking at ~ 480, 570, 658, and 750 nm because of the 4F9/2 → 6H15/2, 6H13/2, 6H11/2, and 6H9/2 transitions of Dy3+ ion, respectively. The optimal Dy3+ ion concentration is ~ 6 mol% in LaBMoO6:Dy3+ phosphor. The lifetime of LaBMoO6:Dy3+ phosphor decreases from 0.467 to 0.279 ms with increasing Dy3+ ion concentration from 2 to 10 mol%. The energy-level diagram of Dy3+ ion is used to explain the luminous mechanism of LaBMoO6:Dy3+ phosphor. The experimental results indicate a potential application of LaBMoO6:Dy3+ phosphor as yellow phosphor for light-emitting diode based on near ultraviolet and blue chips.
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