Abstract
An improved nonclosed hydrothermal synthetic processing is used to synthesize Tm3+ and Nd3+ doped β-NaYbF4 nanophosphors at 85°C in the air without any high-temperature and high-pressure treatments as a final step. The particles have average crystallite size around 40 nm as obtained by TEM and calculation in terms of the XRD data. Intense 475 nm blue upconversion emission originated from the 1G4→3H6 transition of Tm3+ is observed under 808 nm excitation, and its intensity can be enhanced onefold by introducing Nd3+ ion. The dominant populating mechanisms for the β-NaYbF4:Tm3+ and β-NaYbF4:Tm3+/Nd3+ are thought as Tm3+→Yb3+→Tm3+ and Nd3+→Yb3+→Tm3+ energy transfer processes, respectively. The concentration quenching processes for blue and red emissions are discussed.
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