Luminescence properties of Tb~(3+) doped Gd2(WO4)3 phosphor prepared by hydrothermal method

摘要

The Gd2(WO4)3:Tb~(3+) phosphors have been successfully prepared using the hydrothermal method calcined at 900°C in this work. The crystal structure, PLE/PL and fluorescence decay behavior of samples were investigated in detail. Under the 270 ran excitation (4f~8→4f~75d~1 transition of Tb~(3+)), the (Gd_(2-x)Tb_x)(WO4)3 (x=0.01-0.15) phosphors emit the strong green emission at 547 nm (~5D4→~7F5 transition of Tb~(3+)). The quenching concentration was found to be ～10% owing to the exchange reaction between Tb~(3+). The Tb~(3+) addition did not influence the CIE chromaticity coordinates (~0.33±0.02, ~0.60±0.02) and color temperatures (～5542 K) of the (Gd_(2-x)Tb_x)(WO4)3 phosphors. However, due to the energy transfer between Tb~(3+), the fluorescence lifetime for 547 nm emission decreased with the Tb~(3+) content increasing. The Gd2(WO4)3:Tb~(3+) phosphors with strong green emission are expected to be widely used in white light LED and display areas.