Frequency conversion in lanthanide-doped sol-gel derived materials for energy applicationsAlmeida, Rui M.; Sousa, N.; Rojas Hernandez, Rocio Estefania; Santos, Luis F.Journal of Sol-Gel science and technology2020 / p. 520-529 : ill https://doi.org/10.1007/s10971-020-05289-w Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS