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Table 2 Structure parameters of the (La_0.97RE_0.01Yb_0.02)₂O₂S phosphors obtained in this work and those of La₂O₂S [17]

From: (La_0.97RE_0.01Yb_0.02)₂O₂S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)

Sample	Sp.Gr.	a, Å	b, Å	c, Å	V, Å³
RE=Ho	P-3m1	4.0413	4.0413	6.9355	98.096
RE=Er	P-3m1	4.0410	4.0410	6.9354	98.080
La₂O₂S	P-3m1	4.0520	4.0520	6.9463	98.770

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