Massive red-shifting of Ce3+ emission by Mg2+ and Si4+ doping of YAG:Ce transparent ceramic phosphors

Abstract

Y₃Mg_xAl_5−2xSi_xO₁₂:Ce (YAMSG:Ce) transparent ceramics were successfully prepared for the first time by a vacuum sintering technique. Regulation of a wide range of spectra from 533 nm to 598 nm was accomplished in YAMSG:Ce transparent ceramics. The transmittance of the as-prepared YAMSG:Ce transparent ceramics can reach 78%. Moreover, the internal quantum efficiencies of Y_2.985Mg_0.5Al₄Si_0.5O₁₂:Ce can reach 75%. Both a high luminous efficiency of up to 95 lm W⁻¹ and a low correlated color temperature of 3762 K can be achieved in a Y_2.985Mg_0.5Al₄Si_0.5O₁₂:Ce transparent ceramic as the ceramic was coupled with a commercial blue LED chip. The broad color area from yellow-green to orange-red region in the color coordinates diagram was recorded. YAMSG:Ce transparent ceramics prepared in the present work can offer scientists a new matrix to explore their applications in areas such as luminescent materials, scintillators, solid-state lasers and armor.