Fluorescence properties of polycrystalline Tm3+-activated Y3Al5O12 and Tm3+-Li+ co-activated Y3Al5O12 in the visible and near IR ranges

Abstract The photoemission properties of polycrystalline powder Tm 3+ -activated Y 3 Al 5 O 12 and Tm 3+ - Li + co-activated Y 3 Al 5 O 12 were studied in the visible and near-IR ranges at 300 K. The polycrystalline materials were obtained through a novel combustion synthesis technique that yields chemically homogeneous and small particle size( 3+ -activated Y 3 Al 5 O 12 showed that the intensity of the blue emission is weak compared to the red emission. With the addition of Li + as a coactivator, the intensity of the blue emission increased by as much as 87%; however the red and IR emissions also increased. Efficiency measurements showed that the phosphor reached a maximum of 0.21 Im/W at a voltage of 11.7 kV and current of l μA/cm 2 . The optimal composition for maximum blue emission was found to be Y 2.93 Tm 0.07 Al 5 O 12 doped with 1.0 at% Li.

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