Highly phase-pure (La,Ca)Si3(O,N)5:Ce3+ blue-emitting phosphors were successfully synthesized via the one-step solid-state reaction from the system La2O3-CaO-CeO 2-Si3N4. The synthesized (La,Ca)Si 3(O,N)5:Ce3+ exhibits tunable blue broadband emission with the dominant wavelength of 466-479nm and the external quantum efficiency up to ∼45% under 380nm near-UV (NUV) excitation. Spectral simulations of the trichromatic white light-emitting diodes (LEDs) using (La,Ca)Si3(O,N)5:Ce3+ demonstrated markedly higher color rendering index Ra values of 93-95, compared to 76-90 attained by the systems using a conventional BAM:Eu2+ phosphor or InGaN blue LED. The present achievement indicates the promising applicability of (La,Ca)Si 3(O,N)5:Ce3+ as a blue luminescent source for NUV-converting high-color rendering white LEDs.
ASJC Scopus subject areas
- Physics and Astronomy(all)