Chemistry Reference
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from hydrothermally synthesized hydroxide [81, 82]. Hu
et al.
synthesized La(OH)
nanobelts via a simple hydrothermal route and
3
obtained La
O
nanobelts by post annealing at 300-700
°
C [83].
2
3
Interestingly, Devaraju
et al
. reported the solvothermal synthesis
of Y
O
:Tb hollow microspheres without any template [84]. Hollow
2
3
Y(OH)
spheres were obtained first and then converted
to the target product. The hollow structure was presumed to be
formed under supercritical conditions and due to the Ostwald ripening
process. Similar solvothermal-post-annealing synthetic routes were
also reported in Y
and Y(OH)CO
3
3
O
:Eu microspheres and hollow microspheres
2
3
[85, 86]. Chen
. developed a hydrothermal route to synthesize
a series of macroporous lanthanide-organic coordination polymer
foams, which underwent post-annealing to form corresponding
macroporous rare earth oxide monoliths [87]. They also reported
rare earth oxide microspheres and hollow spheres prepared by the
thermolysis of lanthanide coordination compounds [88].
Li
et al
. performed a series of research works on the hydrothermal
synthesis of fluoride nanoparticles of the whole rare earth series,
where oleic acid and corresponding sodium salt (or linoleic acid
and sodium salt) were used as capping reagents [89, 90]. Lin
et al
et
al.
demonstrated a general hydrothermal synthesis method for
REF
nanocrystals with diverse morphologies (elongated particles,
aggregates, and octahedra), where the rare earth nitrates or chlorides,
NaBF
3
, and trisodium citrate were the precursors [91]. They also
reported CeF
4
3+
3+
, CeF
:Tb
, and core-shell structured CeF
:Tb
@
3
3
3
LaF
nanoplates prepared via organic additive and trisodium citrate
3
3
−
(Cit
) assisted hydrothermal method [92]. Chen
et al
. obtained
the multicolor upconversion luminescent LaF
nanocrystals
3
3+
−
3+
3+
−
3+
3+
−
3+
co-doped with Yb
ions via a
solvothermal route by the decomposition of corresponding rare
earth trifluoroacetates [93]. Kumar
Er
, Yb
Tm
, and Yb
Ho
et al.
used a similar solvothermal
3+
method and synthesized LaF
nanocrystals exhibiting infrared
emissions with high efficiencies [94]. Hollow CeF
:Nd
3
nanostructures
3
were obtained by Hu
. with the morphologies of nanocages,
nanorings, nanococoons, and circular hollow disks [95]. The
formation mechanism of hollow nanostructures was also discussed.
et al
Qian
et
al
.
obtained spindle-like lanthanide-doped YF
3
luminescent nanocrystals [96]. The hydrothermal treatment of YCl
,
3
°
NaF, and EDTA at a relatively low temperature of 140
C rendered the
products with good uniformity. Yao
et al.
prepared highly uniform
