Opposite size dependences of the red/green upconversion intensity ratio in sub-20 nm Yb3+,Er3+-doped β-NaGdF4 nanophosphors

Author: Li AiHua   Guan Tengpeng   Sun Zhijun  

Publisher: Edp Sciences

E-ISSN: 1286-4854|106|4|48001-48001

ISSN: 0295-5075

Source: EPL (EUROPHYSICS LETTERS), Vol.106, Iss.4, 2014-05, pp. : 48001-48001

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Abstract