Influence of Gd3+ on the Optical Properties of Dy3+-Activated CaF2 Single Crystal for White LED Application
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The spectroscopic properties of 0.6%Dy:Ca1−xGdxF2+x (x = 0.003, 0.006, 0.012, 0.03) crystals were investigated and compared. The energy transfer process between Gd3+ and Dy3+ was also studied. Increasing the proportions of Gd3+ ions could enhance the visible emission intensity significantly for the blue (478 nm) and yellow (573 nm) emissions; the intensity of the yellow emission was especially increased to be 77 times greater than the 0.6%Dy:CaF2 crystal. Gd3+ ions were not only used to enhance the emission intensity, but also played an important role in regulating the local lattice structure of Dy3+ ions. As a consequence, tunable white-light emission colors could be obtained by adjusting the doping concentration of Gd3+ ions.
KeywordsTunable white-light emissions Dy3+ ions CaF2 single crystals enhanced luminescence
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The work was supported by the National Science Foundation of China (Nos. 61635012 and U183010005), the Strategic Priority Program of the Chinese Academy of Sciences of XDB16030000, and Shanghai Science and Technology Commission (Nos. 16520721300 and 18520744300).
Conflict of interest
There are no conflicts of interest to declare.
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