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Dy3+ activated Na2Zn5(PO4)4 novel phosphor for white LED

K. N.SHINDE1, S.J.DHOBLE2,*

Affiliation

  1. Department of Physics, N.S. Science and Arts College, Bhadrawati-442902, India
  2. Department of Physics, RTM Nagpur University, Nagpur - 440033, India

Abstract

This paper describes the synthesis and photoluminescence (PL) characteristics of Na2Zn5(PO4)4:Dy3+ phosphor . A novel Dy3+ activated Na2Zn5(PO4)4 phosphors was synthesized by conventional solid state diffusion techniques and confirmed by X-ray diffraction (XRD). In the photoluminescence spectra, the Na2Zn5(PO4)4:Dy3+ phosphor emits two distinctive colors: a blue band centered at 433 nm and a yellow band at 573 nm originating from Dy3+ under the 387 nm excitation. The 300– 400 nm is Hg-free excitation (Hg excitation is 85% 254 nm wavelength of light and 15% other wavelengths), which is characteristic of solid state lighting phosphors. Surface morphology also has been studied by scanning electron microscope (SEM). The phosphor showed intense blue and yellow emission with good Commission International (CIE) chromaticity coordinates, which can efficiently excited at 387 nm and emit blue-yellow light. Therefore, Na2Zn5(PO4)4:Dy3+ may find application for near UV chip-based white LEDs..

Keywords

:Phosphor, White LED, Na2Zn5 ,(PO4 )4.

Submitted at: April 1, 2011
Accepted at: May 25, 2011

Citation

K. N.SHINDE, S.J.DHOBLE, Dy3+ activated Na2Zn5(PO4)4 novel phosphor for white LED, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 5, pp. 519-522 (2011)