Intense 2.0 μ m emission properties and energy transfer of Ho3+/Tm3+/Yb3+ doped fluorophosphate glasses

et al. 2014

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Er3+- doped fluorozirconate (ZrF4-BaF2-YF3-AlF3) and oxyfluoroaluminate glasses are successfully prepared here. These glasses exhibit significant superiority compared with traditional fluorozirconate glass (ZrF4-BaF2-LaF3-AlF3-NaF) because of their higher temperature of glass transition and better resistance to water corrosion. Judd-Ofelt (J-O) intensity parameters are evaluated and used to compute the radiative properties based on the VIS-NIR absorption spectra. Broad emission bands located at 1535 and 2708 nm are observed, and large calculated emission sections are obtained. The intensity of 2708 nm emission closely relates to the phonon energy of host glass. A lower phonon energy leads to a more intensive 2708 nm emission. The energy transfer processes of Er3+ ions are discussed and lifetime of Er3+: 4I13/2 is measured. It is the first time to observe that a longer lifetime of the 4I13/2 level leads to a less intensive 1535 nm emission, because the lifetime is long enough to generate excited state absorption (ESA) and energy transfer (ET) processes. These results indicate that the novel glasses possess better chemical and thermal properties as well as excellent optical properties compared with ZBLAN glass. These Er3+- doped ZBYA and oxyfluoroaluminate glasses have potential applications as laser materials.

Section: Resultsmentioning

confidence: 99%

Spectroscopic properties and energy transfer parameters of Er3+- doped fluorozirconate and oxyfluoroaluminate glasses

et al. 2014

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“…If energy of the emission transition of one RE 3+ ion (called the donor) is equal or close to the energy of the absorption transition of the other RE 3+ ion (called the acceptor). Energy transfer between rare earth ions can occur according to the Forster and Dexter theory424344. The absorption cross section of the Er 3+ : 4 I 11/2 → 4 I 15/2 and Yb 3+ : 4 F 7/2 → 4 F 5/2 transitions can be deduced by the Beer-Lambert equation43where is the absorptivity from absorption spectrum, l is the thickness of the glass and N is the ion density.…”

Section: Discussionmentioning

confidence: 99%

Origin of near to middle infrared luminescence and energy transfer process of Er3+/Yb3+co-doped fluorotellurite glasses under different excitations

et al. 2015

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We report the near to middle infrared luminescence and energy transfer process of Er3+/Yb3+ co-doped fluorotellurite glasses under 980, 1550 and 800 nm excitations, respectively. Using a 980 nm laser diode pump, enhanced 1.5 and 2.7 μm emissions from Er3+:I13/2→4I15/2 and I11/2→4I13/2 transitions are observed, in which Yb3+ ions can increase pumping efficiency and be used as energy transfer donors. Meanwhile, Yb3+ can also be used as an acceptor and intensive upconversion luminescence of around 1000 nm is achieved from Er3+:I11/2→4I15/2 and Yb3+: F5/2→4F7/2 transitions using 1550 nm excitation. In addition, the luminescence properties and variation trendency by 800 nm excitation is similar to that using 1550 nm excitation. The optimum Er3+ and Yb3+ ion ratio is 1:1.5 and excess Yb3+ ions decrease energy transfer efficiency under the two pumpings. These results indicate that Er3+/Yb3+ co-doped fluorotellurite glasses are potential middle- infrared laser materials and may be used to increase the efficiency of the silicon solar cells.

“…J-O theory [24][25][26] determines the important spectroscopic and laser parameters of the RE-doped glasses. From the absorption spectrum, the experimental oscillator strength (f exp ) of the transitions is calculated as…”

Section: A Absorption Spectra and J-o Analysismentioning

confidence: 99%

Optical properties and energy transfer processes of Ho3+/Er3+- codoped fluorotellurite glass under 1550 nm excitation for 2.0 μm applications

Journal of Applied Physics

et al. 2014

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Articles you may be interested inEnergy transfer characteristics of silicate glass doped with Er3+, Tm3+, and Ho3+ for 2μm emission Fluorescence properties and energy transfer study of Er3+/Nd3+ doped fluorophosphate glass pumped at 800 and 980 nm for mid-infrared laser applications J. Appl. Phys. 111, 073503 (2012); 10.1063/1.3699059 Enhanced effect of Ce3+ ions on 2 μm emission and energy transfer properties in Yb3+/Ho3+ doped fluorophosphate glasses J. Appl. Phys. 109, 083535 (2011); 10.1063/1.3569855 2.05 µm emission properties and energy transfer mechanism of germanate glass doped with Ho3+, Tm3+, and Er3+ J. Appl. Phys. 109, 053503 (2011); 10.1063/1.3553877 2.0 μ m emission properties and energy transfer processes of Yb 3 + / Ho 3 + codoped germanate glassThis paper investigates 2.0 lm emission properties and energy transfer processes in the Er 3þ /Ho 3þ codoped fluorotellurite glass. The measured absorption spectra demonstrate that the codoped sample can be pumped by 1550 nm excitation efficiently. Judd-Ofelt and radiative parameters are calculated and discussed. Intensive 2.0 lm emission originating from Ho 3þ : 5 I 7 ! 5 I 8 transition is observed and a long lifetime (11 ms) of the 5 I 7 level is measured when Ho 3þ ions are sensitized by Er 3þ ions. Meanwhile, the upconversion spectra of the Er 3þ singly and codoped samples are obtained and the energy transfer processes of the two ions is discussed based on the change of the upconversion emissions. The microscopic interaction parameters of the phonon-assisted (Er 3þ : 4 I 13/2 !Ho 3þ : 5 I 7 ) process are calculated and the microparameter reaches as high as 10.1 Â 10 À41 cm 6 /s. Hence, these results indicate that this Ho 3þ /Er 3þ codoped fluorotellurite glass will be a suitable material for developing solid state laser around 2.0 lm. V C 2014 AIP Publishing LLC.