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Luminescence characterization of Eu3+ and Bi3+ co-doped in Y2SiO5 red emitting phosphor by solid state reaction method

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2009, 19(1), pp.15-18
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

문지욱 1 송영현 1 박우정 1 YOON, DAEHO 1

1성균관대학교

Accredited

ABSTRACT

To enhance near UV-visible absorption region and to applied phosphor convert-white LEDs (PC-WLEDs), a red phosphor composed of Y2SiO5: Eu 3+, Bi3+ compounds was prepared by the conventional solid-state reaction. The photoluminescence (PL) shown that samples were excited by near UV light 395 nm for measurement of PL spectra.Emission spectra of samples have shown red emissions at 612 nm (5D0→7F2). The enhanced near UV~ visible excitation spectrum with a broad band centered at 258 nm and 282 nm originated in the transitions toward the charge transfer state (CTS) due to the Eu3+-Bi3+-O2−interaction. The other excitation band at 350 nm~480 nm, corresponding to the transitions 7F0→5L9 (364 nm),7F0→5G3 (381 nm),7F0→ 5L6 (395 nm),7F0→5D3 (415 nm) and 7F0→5D2 (466 nm), occurred due to enhanced the f-f transition increasing Bi3+ and Eu3+ ions. The PL intensity increased with increased as concentration of Bi3+ and the emission intensity becomes with a maximum at 0.125 mol.

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