Synthesis of Luminescent Ink from Europium-Doped Y₂O₃ Dispersed in Polyvinyl Alcohol Solution

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.

(a)

(b)

(c)