A promising Sr5 (PO4)3Br:RE3+ (RE3+= Dy3+, Eu3+, and Tb3+) Phosphors for Near UV Excited White LED and Display Devices

Abstract

Single phase Sr5 (PO4 )3Br:RE3+ (RE3+= Dy3+, Eu3+ or Tb3+) phosphors were prepared by solid state reaction method and optical properties were investigated for the possible applications in white light emitting diodes (LED) and display devices. Prepared phosphors are characterized by X-ray diffraction, scanning electron microscopy, photoluminescence (PL) and FT-IR spectroscopy. The PL properties of Sr5 (PO4 )3Br:Dy3+ phosphor shows the characteristic emission of blue (479 nm) and yellow (575 nm) light under near UV excitation of 387nm, Sr5 (PO4 )3Br:Eu3+ shows characteristic orange (590 nm) and red (613 nm) under near UV excitation of 396 nm and Sr5 (PO4 )3Br:Tb3+ shows green (545 nm) emission under 379 nm excitation. The results indicate that the RE3+ activated bromoapatite phosphor could be promising candidate for near UV-based white LEDs and display devices.