적색 Y2SiO5:Eu3+ 분말형 전계발광소자 연구

Abstract

Silicon and Yttrium base Y2SiO5 Powder phosphors are widely well known for their excellent durability and efficiency as powder phosphor itself. For the first time, we applied Y2SiO5:Eu3+ powder phosphor for powder base electroluminescence device. The phosphor was synthesized using solid-state reaction at 1300℃ in air for 2 hours. Our device architecture on ITO glass has 10 µm thick Y2SiO5:Eu3+ phosphor emitting layer, BaTiO3 dielectric layer of 20 µm, and sputtered 5 µm Au electrode . The optical device characteristics confirm various emitting peaks at 580 nm, 610 nm and 700 nm due to the f-f transition of Eu3+ ions. The luminance was linearly increased with increasing AC frequency, and the saturation behavior was achieved over 1,000 Hz at 480 V. The voltage-dependence showed exponential increase from the threshold voltage of 450 V at 400 Hz. The device temperature-dependence showed a maximum luminance at 100℃, the Curie temperature of BaTiO3 dielectric layer.