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Graphical abstract Broadband NIR emission spectra of SG-0Er0Nd2Bi, SG-0.4Er0Nd0Bi, SG-0Er0.5Nd0Bi and SG-0.4Er0.5Nd2Bi transparent glass-ceramics samples. Highlights • Broadband NIR emission of Nd–Bi–Er co-doped transparent glass-ceramics was investigated. • A NIR broadband with an FWHM of 600 nm which covered the whole O, E, S, C and L bands was observed. • Mechanism of energy transfer between Bi-related and Er3+, Nd3+ was proposed. • The studied material could provide potential EDFA application in a WDM system. Abstract Super broadband NIR (near-infrared) emission and energy transfer of Nd–Bi–Er co-doped transparent silicate glass-ceramics under excitation 808 nm laser diode were investigated. Super broadband NIR emission in Nd–Bi–Er co-doped extending from 1000 to 1600 nm with a full-width at half-maximum (FWHM) of 600 nm were observed. This result is due to the overlapping NIR emission band centered at 1275 nm (ES 1 → GS) of Bi-related and NIR emission band centered at 1063 nm (4F 3/2 → 4I 11/2) of Nd3+ as well as NIR emission spectral band centered at 1546 nm (4I 13/2 → 4I 15/2) of Er3+. At the same time, the energy transfer processes between Bi-related, Nd3+ and Er3+ were also discussed and proposed. [ABSTRACT FROM AUTHOR]

• Influence of F− on the reduction process of Eu3+ to Eu2+were investigated. • Direct/indirect optical bandgaps of Eu3+/Eu2+–Er3+–Yb3+ co-doped were calculated. • CIE for VIS emissions of Eu3+/Eu2+–Er3+–Yb3+ co-doped was identified. • Energy transfer process between Eu3+/Eu2+ and Er3+ was also discussed. In this paper, we report the influences of F− ions on the reduction process of Eu3+ to Eu2+, and the optical properties of Eu3+/Eu2+–Er3+–Yb3+ co-doped niobate silicate glasses. The visible (VIS), upconversion (UC) emissions, and energy transfer (ET) of Eu3+/Eu2+–Er3+–Yb3+ co-doped niobate silicate glasses under the excitations of 295, 335 nm, and 980 nm laser diode (LD) were investigated. The direct/indirect optical bandgaps and CIE 1931 (x; y) chromaticity coordinates for luminescence of Eu3+/Eu2+–Er3+–Yb3+ co-doped niobate silicate glasses under the excitations of 295, 335 nm were also been calculated and identified. Remarkably, the influences of F− ions and experimental conditions platinum crucibles with the lid on enhancing the reduction process of Eu3+ to Eu2+were also investigated and discussed. [ABSTRACT FROM AUTHOR]