Combined up conversion, down conversion and down shifting photo-luminescence of low cost erbium-ytterbium co-doped porous silicon produced by stain etching

1. Díaz-Herrera, B.
2. Jiménez-Rodríguez, E.
3. González-Díaz, B.
4. Montesdeoca-Santana, A.
5. Velázquez, J.J.
6. Guerrero-Lemus, R.