Tunable upconversion emission in NaLuF4–glass-ceramic fibers doped with Er3+ and Yb3+. Issue 54 (8th October 2019)

• Record Type: Journal Article
• Authors: Gorni, G.; Velázquez, Jose J.; Kochanowicz, M.; Dorosz, D.; Balda, R.; Fernández, J.; Durán, A.; Pascual, M. J.
• Is Part Of: RSC advances. Volume 9:Issue 54(2019)
• Page Start: 31699
• Page End: 31707
• Publication Date: 2019-10-08
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra05182a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Novel 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. Abstract : Novel 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 ( 2 H11/2, 4 S3/2 ) → 4 I15/2 and 4 F9/2 → 4 I15/2 transitions, respectively, together with a blue emission due to 2 H9/2 → 4 I15/2 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 Er 3+ 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 Er 3+ 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.