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)

Pump power dependence of the green and red emissions of (a) NaYF₄:Yb³⁺,Er³⁺, (b) KYF₄:Yb³⁺,Er³⁺ nanocrystals.