Synthesis And Properties Of Rare Earth Activated Lu₃Al₅O₁₂ Phosphors

In recent years, white LED technology and ALPD?advanced laser phosphor display? technology are revolutionizing the field of lighting and display technology respectively, both of which technology are based on the blue light excited phosphor method to achieve. Aiming at issues of current blue light excited green phosphors have low thermal quenching temperature and are difficult to prepare etc, this paper has researched a Lu₃Al₅O₁₂: Ce³⁺ phosphor which not only has simple preparation process but also can be excited by 460 nm blue light and emission green light effectively, thermal quenching temperature of this phosphor is high, so it is the best choice of blue light excited green phosphor.In this paper, the sol-gel combustion method and high temperature solid phase method were used to prepare Lu₃Al₅O₁₂:Ce³⁺ phosphor. Experimental results showed that:Sol-gel method when using citric acid as a chelating agent and in an amount of 1.5 times of metal cation molar amount, doping 3.6% Ce³⁺ ion, sintering at 1300 ? and incubated for 2h, luminous intensity of the synthesised sample was the highest; high temperature solid phase method when doping 4wt% BaF2 as a flux, heating 3h at 1550?, doping 3.6% Ce³⁺ ion, the synthesised phosphor had the best luminescence properties.Lu₃Al₅O₁₂:Ce³⁺ phosphor emission green light peaked at 505 nm under 460 nm blue light excitation, the emission spectrum is a broadband spectrum formed by the superposition of two emission peaks, one emission peak located at 495 nm is attributed to 2D5/2 ? 4f?2F5/2 and 2F7/2? of Ce³⁺, the other emission peak located at 535 nm correspond to 2D3/2 ? 4f?2F5/2 and 2F7/2? of Ce³⁺; excitation peaks at 350 nm and 450 nm are attributed to 4f ? 2D5/2 and 2D3/2 of Ce³⁺, respectively; Lu₃Al₅O₁₂: Ce³⁺, Sm³⁺ phosphor exists energy transfer between Sm³⁺/Ce³⁺ and the energy is transmitted from Ce³⁺ to Sm³⁺.