Abstract
Er3+/Yb3+ codoped niobium pentoxide glasses were fabricated by the aerodynamic levitation (ADL) method with rapid cooling rate. All samples with various doping concentrations showed good upconversion luminescence properties under 980 nm laser excitation. The structure, transmittance spectrum, and luminescence properties of the samples were systemically investigated by XRD, UV–Vis–NIR spectrophotometer, and upconversion spectra. All transparent samples exhibited green and red upconversion emissions centered at 532, 547, and 670 nm. Experimental results showed that the sample codoped with 1 mol% Er3+/Yb3+ has the strongest upconversion emissions, and the increase of the doped Yb3+ concentration results in the increased red emission and reduced green emission. The logI–logP plot of green emission indicated that the green emissions reach the saturation at high pump power excitation, deviating from the low-power regime. After one-photon energy transfer (ET) process, 4I11/2+4I11/2→4F7/2+4I15/2 process between the two neighboring Er3+ ions was responsible for the population of the 4S3/2/4H11/2 states. The niobium pentoxide codoped with Er3+/Yb3+ bulk glasses could be used in the dye sensitized solar cell (DSSC) to improve the efficiency.
Highlights
IntroductionUpconversion luminescence materials have been extensively investigated for their promising
Upconversion luminescence materials have been extensively investigated for their promisingJ Adv Ceram 2017, 6(4): 312–319 upcoversion nanoparticles to detect of primary gastric tumor and lymphatic metastasis
The transmittance of the pure matrix NLZ glass is below 70% and decreases rapidly in the visible region
Summary
Upconversion luminescence materials have been extensively investigated for their promising. Lahoz et al [19] reported the application of Ho3+ doped glass–ceramic materials via direct melting glass to further improve the conversion efficiency of the Si solar cells. Aerodynamic levitation (ADL) method is a promising technique to vitrify materials with low glass-forming ability into bulk form under the containerless condition. It could suppress the inhomogeneous nucleation and container wall’s contact-pollution. Niobium pentoxide is a candidate matrix material for efficient conversion of luminescence materials because the high valence of Nb2O5 is in favor of the upconversion of the rare earth elements. Taking into account its good machinability and chemical stability, Nb2O5 materials may have more promising future than fluorides on the application of the dye sensitized solar cell (DSSC). The results indicate that bulk upconversion luminescence glass with good mechanical property can be used in solar cell
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