Luminescence Properties of an Orange-Reddish Emitting Phosphor KCaBi(PO4)2:Sm3 + with Excellent Thermal Stability
A series of Sm3+ activated KCaBi(PO4)2 with orange-reddish (0.571, 0.424) (CCT = 1847 K) light emitting phosphors were prepared by the solid state method. Their crystal structure and phase composite were analyzed by X-ray diffraction patterns (XRD) and X-ray photoelectron spectroscopy (XPS). Upon excitation at 405 nm, the emission spectra ranged from 500 nm to 750 nm wavelength, corresponding to 4G2-6H J (J = 5/2, 7/2, 9/2 and 11/2) transitions of Sm3+ ions. The optimum doping concentration of Sm3+ ions was turned out to be 0.04, and the concentration quenching mechanism was verified as dipole–dipole interaction using Dexter's theory. The critical distance R c for energy transfer among Sm3+ ions were calculated to be 20.53 Å. In addition, the detailed investigation of decay time and thermal stability revealed that the PL intensity of representative sample KCaBi(PO4)2:0.04Sm3+ at 150 °C only dropped 9.1% of its primitive intensity recorded at room temperature with an activation energy of 0.4099 eV. Besides this, the color purity of the representative sample KCaBi(PO4)2:0.04Sm3+ was 94.5%. These findings proved the potential application of KCaBi(PO4)2:0.04Sm3 phosphors in w-LEDs.
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Document Type: Short Communication
Publication date: September 1, 2017
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