Synthesis and Luminescence of Li1.0nb0.6ti0.5o3:Dy3+ as N-Uv Excited High Efficient Ceramics for Wled Packaging Applications

Abstract

A series of Li1.0Nb0.6Ti0.5O3: xDy3+ luminescent ceramics were successfully prepared by sol-gel and solid-state method. The XRD results indicate the substitution of Dy3+ for Li+/Ti4+/Nb5+ has no significant effect on the phase structure of M-phase Li1.0Nb0.6Ti0.5O3 matrix. Li1.0Nb0.6Ti0.5O3: 3wt.%Dy3+ luminescent ceramics with the least pores and the densest sintering state can be obtained at 950ºC by sol-gel method. By contrast, the best sintering temperature for Li1.0Nb0.6Ti0.5O3: 3wt.%Dy3+ ceramics prepared by SSR method is 1075ºC. The excitation and emission spectra of Li1.0Nb0.6Ti0.5O3: xDy3+ ceramics were mainly composed of blue and yellow light caused by 4F9/2→6H15/2 and 4F9/2→6H13/2 of Dy3+ under the UV light of 390 nm excitation. According to CIE chromaticity coordinate diagram, the chromaticity coordinates of Li1.0Nb0.6Ti0.5O3:3wt%Dy3+ luminescent ceramics prepared by the two methods are located in the warm-white light area, closed to the standard white light coordinates. The above results show that Li1.0Nb0.6Ti0.5O3: xDy3+ luminescent ceramics can be sued as n-UV excited white light ceramics for WLED packaging applications.

Keywords: Li1.0Nb0.6Ti0.5O3: Dy3+ Ceramics, WLED package, sol-gel and solid-state method, luminescence properties