Abstract
Abstract Ho 3+ /Yb 3+ /Tm 3+ triple doped CaWO 4 polycrystals are synthesized by a sample high temperature solid state method. The crystal structure of the polycrystals is characterized by means of X-ray diffraction.Under single-wavelength diode laser excitation of 980 nm, the bright white light consists of the blue, green, and red upconversion radiations which correspond to the transitions 1 G 4 → 3 H 6 of Tm 3+ ions, 5 S 2 / 5 F 4 → 5 I 8 and 5 F 5 → 5 I 8 of Ho 3+ ions, respectively. The pump power plays an important role in the blue upconversion emission intensity, and it helps to the adjustment of the white upconversion emission chrominance. The calculated color coordinates display that white light can be achieved by adjusting pump powers. The CIE coordinate close to (0.33, 0.33) is potentially suitable for the widely realistic application in the field of displays, lasers, and lighting technology. The possible upconversion mechanisms are investigated and discussed.
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