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A series of single-phase white-light-emitting phosphors, Eu2+-activated Ba3GdNa(PO4)3F phosphors were synthesized by solid-state reactions. The crystal structure of Ba3GdNa(PO4)3F was been identified by Rietveld refinement of X-ray diffraction pattern. The Eu2+-activated Ba3GdNa(PO4)3F phosphors exhibit broad excitation spectra from 250 to 420nm, which matched well with the n-UV LED chips. Under the...
Bluish-green Ba3Si6O9N4:Eu2+ phosphors were synthesized by two-step synthesis processes using BaSiO3 as a precursor. The samples were prepared by high-temperature solid-state reaction, and investigated by X-ray diffraction (XRD) and fluorescence spectrometer photometer (PL) respec-tively. The results of XRD illustrated that two-step method was beneficial to improve phases of Ba3Si6O9N4:Eu2+ phosphor...
This paper systematically analyzes first the effect of phosphor geometry on luminous flux of phosphor-converted LED. Five phosphor geometries are investigated based on Mie-theory calculations. Results show that phosphor geometry has impact on luminous flux, and pcLED with a phosphor layer of spherically top surface achieve an improvement of 12%.
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