Upconversion luminescence and Visible-Infrared Properties of β-NaLuF₄:Er³⁺ Microcrystals Synthesized by the Surfactant-Assisted Hydrothermal Method

Table 2

Unit cell lattice constants and crystallite sizes for hexagonal phase of NaLuF₄ and orthorhombic phase of LuF₃ prepared using different surfactants, respectively.

Samples	a (Å)	c (Å)	Cell volume (Å^3)
JCPDS 27-0726	5.9010	3.4530	104.13
S1	5.9291	3.4597	105.33
S2	5.9278	3.4583	105.24
S3	5.9354	3.4595	105.54
S4	5.9341	3.4509	105.23
S5	5.9341	3.4545	105.06
S6	5.9341	3.4509	105.23
S8	5.9661	3.4191	105.39
S9	5.9284	3.4597	105.30
JCPDS 17-0796	6.1810	4.4460	184.97
S7	6.1019	4.5715	188.75