Development of Dy3+ activated K2MgP2O7 pyrophosphate phosphor for energy saving lamp

Abstract

Present work reports, synthesis of Dy3+ activated K2MgP2O7 pyrophosphate phosphor by using modified solid state diffusion that has been studied for its X-ray diffraction pattern (XRD). Furthermore, the chromaticity coordinate values were estimated from emission spectra of K2MgP2O7. The photoluminescence emission spectra of the phosphors having an excitation at around 351nm (mercury free) showed two distinguishing bands centered at around 485nm (blue) and 575nm (yellow) corresponding to 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions of Dy3+, respectively. These phosphors have strong absorption in the near UV region. K2MgP2O7 pyrophosphate phosphor is suitable for color converter using UV light as the primary light source, which can be used as a blue/yellow phosphor excited by n-UV LED chip and mixed with other color emission phosphors to obtain white light. The 300–400nm is Hg-free excitation (mercury excitation is 85% 254nm wavelength of light and 15% other wavelengths), which is characteristic of solid-state lighting phosphors. Hence PL emission in trivalent dysprosium may be efficient photoluminescent materials for solid-state lighting phosphors. The intact study reveals that the present phosphor have promising applications in the lamp industry especially for solid state lighting (mercury-free excited lamp phosphor) and white light LED.