KBaPO4:Ln (Ln=Eu, Tb, Sm) phosphors for UV excitable white light-emitting diodes |
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Authors: | CC Lin SF Hu RS Liu |
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Institution: | a Department of Chemistry, National Taiwan University, Taipei 106, Taiwan b Institute of Electro-optical Science and Technology, National Taiwan Normal University, Taipei 116, Taiwan c Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan |
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Abstract: | This letter reports the novel three emission bands based on phosphate host matrix, KBaPO4 doped with Eu2+, Tb3+, and Sm3+ for white light-emitting diodes (LEDs). The phosphors were synthesized by solid-state reaction and thermal stability was elucidated by measuring photoluminescence at higher temperatures. Eu2+-doped KBaPO4 phosphor emits blue luminescence with a peak wavelength at 420 nm under maximum near-ultraviolet excitation of 360 nm. Tb3+-doped KBaPO4 phosphor emits green luminescence with a peak wavelength at 540 nm under maximum near-ultraviolet excitation of 370 nm. Sm3+-doped KBaPO4 phosphor emits orange-red luminescence with a peak wavelength at 594 nm under maximum near-ultraviolet excitation of 400 nm. The thermal stabilities of KBaPO4:Ln (Ln=Eu2+, Tb3+, Sm3+), in comparison to commercially available YAG:Ce3+ phosphor were found to be higher in a wide temperature range of 25-300 °C. |
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Keywords: | Phosphor KBaPO4 Light-emitting diodes |
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