The impact of Yb3+ concentration on multiband upconversion in single NaYF4:Yb/Er microcrystal determined via nanosecond time-resolved spectroscopy
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Kai Han | Zhongyang Xing | Wenda Cui | Chuan Guo | M. Yuan | Tongcheng Yu | Hanchang Huang | Shuai Hu | Guo-min Zhao