Tunable upconversion emission in NaLuF4–glass-ceramic fibers doped with Er3+ and Yb3+
Giulio Gorni , Jose J. Velázquez , Marcin Kochanowicz , Dominik Dorosz , R. Balda , J. Fernández , A. Durán , M. J. Pascual
AbstractNovel glass-ceramic optical fibers containing NaLuF4 nanocrystals doped with 0.5ErF3 and 2YbF3 (mol%) have been prepared by the rod-in-tube method and controlled crystallization. NaLuF4 nanocrystals with a size around 20 nm are obtained after heat treatment at 600 °C. 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 have been observed under excitation at 980 nm. The intensity of the green and red upconversion bands shows a nearly linear dependence on the excitation power which can be explained by saturation effects in the intermediate energy states and proves that a sensitized energy transfer upconversion process is responsible for the population of the emitting levels of Er³⁺ ions. 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.
|Journal series||RSC Advances, ISSN 2046-2069, (N/A 100 pkt)|
|Publication size in sheets||0.5|
|Internal identifier||ROC 19-20|
|Score||= 100.0, 17-02-2020, ArticleFromJournal|
|Publication indicators||: 2017 = 0.736; : 2018 = 3.049 (2) - 2018=3.168 (5)|
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