https://www.sintef.no/en/publications/publication/233859/
Optical Up-Conversion in Er3+ and Yb3+ Codoped Y2O3 Films Prepared by Pulsed Laser Deposition for...
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https://experts.illinois.edu/en/publications/composite-photocatalyst-of-nitrogen-and-fluorine-codoped-titanium/fingerprints/?sortBy=alphabetically
Composite photocatalyst of nitrogen and fluorine codoped titanium oxide nanotube arrays with...
https://pubs.rsc.org/en/content/articlelanding/2019/tc/c9tc02776a
Temperature dependent energy transfer in Bi/Er codoped barium gallogermanate glasses for tunable...
Bi-Doped glasses and fibers show tremendous potential for application in broadband optical amplifiers and tunable fiber lasers due to their intriguing...
https://www.nist.gov/publications/erbiumytterbium-codoped-glass-waveguide-laser-producing-170-mw-or-output-power-1540-nm
Erbium/Ytterbium-Codoped Glass Waveguide Laser Producing 170 mW or Output Power at 1540 nm | NIST