Phase transformation and morphology tuning of β-NaYF4:Yb3+,Er3+ nanocrystals through K+ ions codoping<xref ref-type="fn" rid="cpb141850fn1">*</xref>

Phase transformation and morphology tuning of β-NaYF₄:Yb³⁺,Er³⁺ nanocrystals through K⁺ ions codoping*

Liang Zhi-Qin^a),^b), Zhao Su-Ling^a),^b)†, Cui Yue^a),^b), Tian Li-Jiao^a),^b), Zhang Jun-Jie^a),^b), Xu Zheng^a),^b)

TEM images of the as-precipitated nanocrystals: (a) K⁺=0 mol%, (b) K⁺=20 mol%, (c) K⁺=40 mol%, (d) K⁺=60 mol%, (e) K⁺=80 mol%, (f) K⁺=100 mol%. The inset in panel (f) shows the HRTEM images of the products in panel (f).