Synthesis of yellow-green phosphor by co-doping

Write purpose, procedure, results and discussion within 200 words. Taking Li2SrSiO4 as host, a series of Eu2+/Ln3+ (Ln is Lanthanide element) singly-doped and co-doped phosphors were synthesized through sol-gel method. The objective is to synthesize broad yellow phosphor and to improve the quality of LED. I investigate luminescence properties of this phosphor. We get the green color emitting at around 510 nm by doping Li2SrSiO4: Eu, Ho. However, sample doped Lu do not emit. And Ho is reduced above 600°C. By co-doping Ho and Eu, we successfully synthesized a yellow phosphor having a broad emission band. As confirmed by the chromaticity diagram, the one doped with Eu and Ho compared with Eu phosphor gave a color closer to white. However, in some synthesis conditions, emission of Ho was not observed.