Niobium oxide influence in the phosphate glasses triply doped with Er3+/Yb3+/Eu3+ prepared by the melting process - Faleiro, José Henrique; Dantas, Noelio Oliveira; Silva, Anielle Christine Almeida; Barbosa, Helliomar Pereira; Silva, Bruno Henrique Sacoman Torquato da; Lima, Karmel de Oliveira; Gonçalves, Rogéria Rocha; Ferrari, Jefferson Luis (Journal of Non-Crystalline Solids, 2021)