Nd3+/Yb3+ co-doped mid-infrared luminescence fluorobromide glass with energy transfer and zero-thermal-quenching IR emission☆
Graphical abstract
Under the action of Nd3+/Yb3+ co-doping, 3.9 μm mid-infrared light source is obtained pumped with a 793 nm laser.
Introduction
Mid-infrared light has broad application prospects in pollutant detection, laser chemistry, isotope separation, and laser surgery.1, 2, 3, 4, 5, 6 Fiber lasers have attracted much attention due to their high power, small size and good beam quality. Fiber lasers use glass materials, which can be easily used in optical fibers.7 Rare earth ions doped glass fibers as gain media can achieve high efficiency laser and excellent beam quality.8 For rare earth doped laser glasses, the low phonon energy matrix has the advantage of achieving efficient mid-infrared illumination. Fluoride glass has the unique advantage of relatively low phonon energy, which makes many researchers choose fluoride glass as the matrix material for rare earth doping research.9 ZrF4–BaF2–LaF3–AlF3–NaF (ZBLAN) glass has a wide transparent window of about 0.22–8 μm and low-effective acoustic energy below 600 cm−1.10,11 Nd3+ doped fluoride glass is an important mid-infrared material. Many researchers have studied the near-infrared luminescence of Nd3+-doped fluoride glass.12,13 Nd3+ doped fluoride glass has been successfully used in fiber laser and other aspects.14, 15, 16 In our previous reports, anion substitution and rare earth ion doping were usually used to adjust the crystal field to achieve some energy transfer and thus to achieve enhanced mid-infrared luminescence.17, 18, 19, 20 Yb3+ was introduced in rare earth ion co-doping experiments to study the luminescence of Nd3+ at 3.9 μm. There is an effective mutual energy transfer process between Nd3+ and Yb3+, to the best of our knowledge. However, there have been few reports on infrared emission in Nd3+/Yb3+ co-doped and anion-substituted systems in fluorobromide glass.
In this article, an effective 3.9 μm luminescence in Nd3+/Yb3+ co-doped fluorobromide glasses at 793 and 980 nm pumping was reported. It was demonstrated that at 793 nm excitation the luminescence of Nd3+:2H11/2 → 4F7/2 (3.9 μm) was reduced by effective energy transfer from the Nd3+:2H11/2 level to the Yb3+:2F5/2 level. Meanwhile, it was demonstrated that the effective energy transfer from the Yb3+:2F5/2 level to the Nd3+:2H11/2 level enhanced the luminescence of Nd3+:2H11/2 → 4F7/2 (3.9 μm) at 980 nm excitation. Moreover, the Judd–Ofelt intensity parameters, phonon energy, fluorescence lifetime, absorption and emission cross-sectional area in a Nd3+/Yb3+ co-doped fluorobromide glasses were also investigated.
Section snippets
Experimental
The fluorobromide glass of 53ZrF4–20BaF2–4LaF3–3AlF3–15NaF–5NaBr-1NdF3-xYbF3 (x = 0, 0.25, 0.5, 0.75, 1) was prepared by melt quenching. In addition, the matrix glass samples of 53ZrF4–20BaF2–4LaF3–3AlF3–15NaF (named as FZ:0Br) and 53ZrF4–20BaF2–4LaF3–3AlF3–15NaF–5NaBr (named as FZ:5Br) were prepared for Raman test. Firstly we ground the weighed raw materials uniformly and then covered them with ammonium fluoride to create a good gas environment. The samples were then placed in a preheated
Results and discussion
EDS analysis was performed at random locations on the F–Br glass to determine the chemical element content of the glass. Table 1 lists the chemical elemental composition (F, Zr, Ba, La, Al, Na, Nd, Br, Yb) contained in the F–Br glass:Nd,0.5Yb sample and the atomic and weight concentrations of the F–Br glass:Nd,xYb samples. Comparing F–Br glass:Nd,0Yb with other samples, it is known that Yb ions are doped in the ytterbium-doped fluorobromide glass sample, and the Yb ions contents are gradually
Conclusions
In conclusion, Nd3+/Yb3+ co-doped fluorobromide glass was prepared by the melt quenching method. The light emission characteristics of the sample at 3.9 μm under the excitation of 793 and 980 nm were studied in detail. To our knowledge, there is an effective mutual energy transfer process between Nd3+ and Yb3+. It is proved under 793 nm excitation that the luminescence of Nd3+ at 3.9 μm is reduced by effective energy transfer from Nd3+:2H11/2→Yb3+:2F5/2. At the same time, it is proved that the
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Foundation item: Project supported by the National Key Foundation for Exploring Scientific Instrument of China (2014YQ120351) and National Natural Science Foundation of China (11504266, 51702235, 51871167).