Geoscience Reference
In-Depth Information
Figure 10.44 TEM images of CdS
x
Se
1
2
x
products with different reaction time: (a) 1 h,
(b) 2 h, (c) 3 h, and (d) 4 h.
Source: Photographs courtesy of Prof. Yong Liu.
10.6.10 Synthesis of Phosphor Nanoparticles
This is one of the most attractive topics in nanotechnology owing to the device fabri-
cation and bioimaging (medical use) capabilities of phosphor nanoparticles. There
are several phosphor nanoparticles prepared under near-critical to supercritical
hydrothermal conditions. Among them, the most common ones are rare earth vana-
dates (RVO
4
:Nd
3
1
, RVO
4
:Eu
3
1
), rare earth phosphates (LaPO
4
:Nd
3
1
,LaPO
4
:Eu
3
1
,
LaPO
4
:Er
3
1
), rare earth
doped garnets (YAG:Eu
3
1
, YAG:Nd
3
1
, YAG:Ce
3
1
), rare
doped perovskite-based compounds (YAlO
3
:Eu
3
1
, YAlO
3
:Er
3
1
), and rare
earth oxides (Lu
2
O
3
:Eu
3
1
,Y
2
O
3
:Eu
3
1
,Y
2
O
3
:Er
3
1
,R
x
Lu
2
2
x
O
3
:Eu
3
1
, where R
5
Y,
Gd)
[206
earth
209]
. Depending upon the active rare earth ion dopant, the color of the
light-emitting diode varies. Here we discuss the synthesis of only some selected
