Spark plasma sintering of MgAl 2 O 4 :Mn 2+ transparent ceramic phosphors with low thermal quenching, narrow-band green emission

Abstract

MgAl 2 O 4 :Mn 2+ transparent ceramics were fabricated by reactive spark plasma sintering (SPS). The ceramic samples show narrow-band green emission under the 450 nm blue light excitation, which is corresponding to 4 T 1 ( 4 G)- 6 A 1 ( 6 S) transition of Mn 2+ in the tetrahedral site. The emission peak of the Mg 0.93 Al 2 O 4 :0.07Mn 2+ ceramic sample was located at 525 nm with the full-width at half-maximum (FWHM) value of 36 nm. The internal quantum yield (IQY) of Mg 0.93 Al 2 O 4 :0.07Mn 2+ reached 63%. The emission intensity remained ∼98% at 150 °C compared to its initial value at room temperature, showing excellent thermal quenching performance. The results indicated that MgAl 2 O 4 :Mn 2+ ceramic phosphor is a promising candidate for high brightness, wide gamut display backlight applications.