Abstract
A series of white-emitting K2CaP2O7:Dy3+ and K2CaP2O7:Dy3+, Eu3+ phosphors were synthesized via a solid-state method, and Eu3+ was co-doped in K2CaP2O7:Dy3+ to improve its white light performance. The influences of preparation temperature and Dy3+/Eu3+ concentration on the crystal structure and photoluminescence characteristics were investigated. XRD results indicate that K2CaP2O7:Dy3+ samples prepared above 700 °C matches the standard K2CaP2O7 phase. Under excitation of 349 nm, K2CaP2O7:Dy3+ phosphor exhibited characteristic emission peaks at 487 nm (blue) and 579 nm (yellow), and white emission was realized through combining these blue and yellow emissions. After co-doping Eu3+ ions, the co-luminescence of Dy3+/Eu3+ with energy transfer between Dy3+and Eu3+ were demonstrated. The chromaticity of white light was controlled by changing the ratio of Dy3+/Eu3+ concentrations, which lead to a warm white light. Therefore, the results indicate that K2CaP2O7:Dy3+, Eu3+ powders have a potential application in w-LEDs as single-component white-emitting phosphor.
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