Tuning color output and enhancing upconversion emission of Er3+ ions in transparent sodium lutetium fluoride glassceramics in bulk and optical fibers, by adjusting the Yb3+ doping level and the excitation power, has been demonstrated. The addition of Yb3+ enhances the UC emission and tunes the color from green to yellow due to an increase of the red-to-green intensity ratio. Moreover, the relative emission intensities of blue, green, and red emissions can be changed by controlling the excitation power which tunes the color from yellow to green.
In this work, we report the influence of the excitation power density on the upconversion emission of Er3+ ions in novel glass-ceramic optical fibers containing NaLuF4 nanocrystals codoped with 0.5ErF3 and 2YbF3 (mol%) prepared by the rod-in-tube method and controlled crystallization. Intense upconverted green and red emissions due to (2H11/2,4S3/2)→4I15/2 and 4F9/2→4I15/2 transitions, respectively, together with a blue emission due to 2H9/2→4I15/2 transition has been observed under excitation at 980 nm. The upconversion emission color changes from yellow to green by increasing the excitation power density which allows to manipulate the color output of the Er3+ emission in the glass ceramic fibers. The tunable emission color is easily detected with the naked eye. This interesting characteristic makes these glass-ceramic fibers promising materials for photonic applications.
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