One-step preparation of blue-emitting (La,Ca)Si3(O,N) 5:Ce3+ phosphors for high-color rendering white light-emitting diodes

Atsuro Yaguchi, Takayuki Suehiro, Tsugio Sato, Naoto Hirosaki

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9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number022101
JournalApplied Physics Express
Volume4
Issue number2
DOIs
Publication statusPublished - 2011 Feb 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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