银表面等离子体对掺铒铋化物发光玻璃中978和1 539 nm激光所致上转换发光的增强作用

doi:10.3964/j.issn.1000-0593(2020)09-2721-06

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Abstract Upconversion luminescence of trivalent rare-earth ions has some valuable application technologies: Waveguide upconversion and amplification and laser, Up-conversion three-dimensional display, Femtosecond spectral applications, Laser temperature control, Three-dimensional imaging and storage, Optical temperature sensing system, Dental and other biophysical applications, Up-conversion fluorescence anti-counterfeiting, Up-conversion broadband light source, and Up-conversion infrared display, etc.Promoted by the demand for solar cells, up-conversion research has once again shown a surging upsurge of research. Current, using the near field enhancement effect of metal surface Plasmon resonance can effectively enhance the luminescent properties of fluorescent substances near its surface. It is possible to increase the intensity of upconversion luminescence by a considerable margin. Thus, it is possible to promote up-conversion luminescence to practical use further. We use the ion introduction method to introduce silver particles into bismuth luminescent glass. Experimental results show that the surface Plasmon resonance absorption peak of silver surface Plasmon is positioned at about 580～600 nm. Moreover, the prolongation of heating time leads to a sharp enhancement and a slight blue shift of the surface Plasmon absorption peak. Subsequently, we find that three groups two-photon upconversion fluorescence of 531.0 nm ²H_11/2→⁴I_15/2, 546.0 nm ⁴S_3/2→⁴I_15/2, and 657.5 nm ⁴F_9/2→⁴I_15/2of Er³⁺ ions can be induced by the 978 nm laser. Upconversion luminescence mechanism, when erbium doped bismuth luminescent glass excited by 978 nm laser, is the first step ⁴I_15/2→⁴I_11/2resonance ground state absorption and the second step ⁴I_11/2→⁴F_7/2 resonance excited state absorption. The introduction of silver nano surface Plasmon facilitates that the maximum enhancement of upconversion luminescence is 272.0% times bigger in bismuth glass, when excited by 978 nm laser. Finally, the 1 539 nm laser can induce four groups upconversion fluorescence of 528.0 nm ²H_11/2→⁴I_15/2, 547.0 nm ⁴S_3/2→⁴I_15/2, 657.0 nm ⁴F_9/2→⁴I_15/2, and 795.0 nm ⁴I_9/2→⁴I_15/2 of Er³⁺ ion. The mechanism of 528.0 nm ²H_11/2→⁴I_15/2 and 547.0 nm ⁴S_3/2→⁴I_15/2 upconversion luminescence is mainly ⁴I_15/2→⁴I_13/2, ⁴I_13/2→⁴I_9/2, and ⁴I_9/2→²H_11/2three-step photo-excited absorption transition process of 1539 nm laser. The mechanism of 657.0 nm ⁴F_9/2→⁴I_15/2 upconversion fluorescence is mainly the ⁴I_15/2→⁴I_13/2, ⁴I_13/2→⁴I_9/2, and ⁴I_11/2→⁴F_9/2 three-step photo-excited absorption transition process of 1 539 nm laser. Furthermore, the introduction of silver nano surface Plasmon induces that the maximum enhancement of up-conversion luminescenceof Er³⁺ ionstimulated by 1 539 nm laser is 160.3% times bigger in bismuth glass. Obviously, the enhancement effect of 978 nm laser upconversion, which is near the resonance absorption peak of silver surface Plasmon, is better than that of 1 539 nm laser upconversion.

Key words：Upconversion luminescence enhancement; Silver nanoparticles; Er³⁺ ion; Surface plasmon; Bismuth glass

Received: 2019-08-26 Accepted: 2019-12-27

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2020)09-2721-06 OR https://www.gpxygpfx.com/EN/Y2020/V40/I09/2721