Enhancement of upconversion intensity in Er3+ doped tellurite glass in presence of Yb3+

Applied Physics B (Impact Factor: 1.86). 07/2011; 104(1):233-236. DOI: 10.1007/s00340-011-4422-6


TeO2-PbO glasses doped/codoped with Er3+/Er 3+-Yb3+ ions have been fabricated by melting and quenching method. Efficient frequency upconversion emissions spanning from blue to red regions corresponding to the 2H11/2, 4S 3/2→4I15/2 and 4F 9/2→4I15/2 transitions, respectively, upon excitation with 976 nm diode laser radiation have been observed. The variations observed in the intensity of whole upconversion emission spectra due to the presence of the Yb3+ ions are reported and discussed in detail.

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    • "Herein, we focus upon the blue to visible-NIR downshifting and visible to NIR quantum cutting in the Er 3þ /Er 3þ eYb 3þ doped/ codoped tungsten tellurite glasses. TeO 2 /WO 3 was elected as a glass former/modifier due to its favourable characteristics such as the low phonon frequency, high refractive index, low glass transition and melting temperature, high thermal and chemical stability [17] [18]. The melt quenching method was adopted for glass synthesis because of its easier synthesis process and less instrumentation requirements. "
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    ABSTRACT: Downshifting/quantum cutting behaviour of the Er3+-Yb3+ doped tungsten tellurite glasses, synthesized by a conventional melt-quenching route is discussed. The non-crystalline nature and thermal stability of the prepared glasses were confirmed by X-ray diffraction, scanning electron microscopy and thermo-gravimetric analysis/differential thermal analysis whereas the optical spectroscopy was obtained via optical absorption and photoluminescence excitation/emission spectra. The results displayed a markable reduction in visible emissions observed through the 2H11/2 → 4I15/2, 4S3/2 → 4I15/2, 4F9/2 → 4I15/2 and 4I9/2 → 4I15/2 transitions of the Er3+ ion and a huge enhancement of about 14.2 times in the near-infrared (∼977 nm upon 490 nm and 325 nm excitations) emission range on incorporation of the Yb3+ ions. A cross relaxation from 4F7/2 → 4I11/2 (Er3+) to 2F7/2 → 2F5/2 (Yb3+) and energy transfer from 4I11/2 (Er3+) to 2F5/2 (Yb3+) states were found to be responsible to cut the blue photon (∼490 nm) into two near infrared (∼977 nm) photons, which put forward the convenience of the present glass as a possible luminescent layer to enhance the efficiency of silicon solar cells.
    Journal of Alloys and Compounds 10/2015; 657. DOI:10.1016/j.jallcom.2015.10.081 · 3.00 Impact Factor
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    • "9/2 → 4 I 15/2 , 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 , 4 F 9/2 → 4 I 15/2 and 4 I 9/2 → 4 I 15/2 transitions from the Er 3+ ion whereas the emission band around 489 nm is due to the 2 F 5/2 → 2 F 7/2 transition of the Yb 3+ ion, respectively [27] [28] [29] "
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    ABSTRACT: The present paper covers a detail explanation about the laser induced optical heating and temperature sensing ability of intense green upconversion emitting Er3+–Yb3+ codoped SrWO4 phosphor. The structural studies based on X-ray diffraction and Fourier transform infrared analysis confirmed the phase formation, crystallinity and the presence of vibrational bands of the corresponding host lattice. The optical investigation was performed by recording the diffuse reflectance and upconversion emission spectra upon a 980 nm excitation. Multiphoton upconversion processes were confirmed by pump power dependence study for the various emission bands throughout the visible region. Optical thermometry has been performed using the fluorescence intensity ratio technique in which two thermally coupled levels of the green emission bands were used. A relatively low temperature (518 K) sensor with very high sensor sensitivity (14.98 × 10−3 K−1) is determined from the observed results. The optical heating ability of the synthesized phosphor is also determined by using the results of the optical thermometry and found the heat generation up to ∼417 K. The results obtained may possibly be used in cancer therapy.
    Sensors and Actuators B Chemical 01/2015; 209:352. DOI:10.1016/j.snb.2014.11.126 · 4.10 Impact Factor
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    ABSTRACT: Using the combustion synthesis, CaYAl3O7:Er3+ phosphor powders co-doped with Yb3+ have been prepared at low temperatures (550°C) in a few minutes. Formation of the compound was confirmed by X-ray powder diffraction. Near-infrared to visible upconversion fluorescence emission in the Er3+ doped CaYAl3O7 phosphor powder has been observed. The effect of co-doping with triply ionized ytterbium in the CaYAl3O7:Er3+ phosphor has been studied and the process involved is discussed.
    Journal of Luminescence 12/2011; 131(12):2679-2682. DOI:10.1016/j.jlumin.2011.06.055 · 2.72 Impact Factor
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