Abstract
A series of Yb3+, Ho3+, Tm3+ doped NaLuF4-based nanostructures and microstructures with controllable crystalline phases and morphologies were designed via adjusting the parameters of the oleic acid-assisted hydrothermal method. It is found that increasing the NH4F content and prolonging the reaction time to conduce the formation of β-NaLuF4 and the possible evolution process was proposed. Besides, the dependence of upconversion emission on sensitizer (Yb3+) concentration and pump power in Yb3+-Ho3+ and Yb3+-Tm3+ codoped β-NaLuF4 was investigated. On this basis, a tunable multicolor was achieved in NaLuF4:Yb3+/Ho3+/Tm3+ microrods. It is worth mentioning that white-light output with the calculated CIE color coordinate of (0.333, 0.330) was realized in the microrods, and the triply doped samples presented an outstanding capacity for color controlling and satisfactory color stability in the white region as well as lower threshold pump power density and lower optimal excitation pump power density for white-emission, which present great potential applications in the field of color display and white light-emitting diodes.
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