]>Synthesis of Luminescent Ink from Europium-Doped Y<sub>2</sub>O<sub>3</sub> Dispersed in Polyvinyl Alcohol Solution : Figure 4
918351.fig.004a
(a)
918351.fig.004b
(b)
918351.fig.004c
(c)
Figure 4: Colloid of Y2O3:Eu prepared at different heating temperatures: (a) without heating (room temperature), (b) heating temperature of 30–40 oC, and (c) heating temperature of 50–60 oC.