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1

The Effect of Synthesis Parameters on Luminescence Properties of Ca-α-Sialon:Eu2+

100%

Pawlik T., Sopicka-Lizer M., Michalik D., Lisiecki R.

Archives of Metallurgy and Materials

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2013

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issue 4

2

Czochralski Growth and Optical Properties οf (Lu_{x}Gd_{1-x})_2SiO_5 Solid Solution Crystals Single Doped with Sm^{3+} and~Dy^{3+}

76%

Ryba-Romanowski W., Strzęp A., Głowacki M., Lisiecki R., Solarz P., Domagala J.

Acta Physica Polonica A

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2013

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vol. 124

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issue 2

321-328

EN

Solid solution crystals (Lu_{x}Gd_{1-x})_2SiO_5 single doped with Sm^{3+} and Dy^{3+} were grown by the Czochralski method. Segregation coefficients Lu/Gd, melting temperatures and structures of solid solution crystals were determined for 0.15 ≤ x ≤ 0.8. It was found that for x ≥ 0.17 the crystals belong to the monoclinic system within a space group C2/c and their melting temperature diminishes monotonously from 1990C to 1780C when x decreases from 0.8 to 0.15. Disparity of ionic radii of Lu^{3+} and Gd^{3+} induces structural disorder that brings about an inhomogeneous broadening of spectral lines in absorption and emission spectra of incorporated luminescent Sm^{3+} and Dy^{3+} ions. Optical properties of obtained crystals were determined based on results of measurement of absorption and emission spectra and luminescence decay curves. Spectroscopic investigation revealed that Sm^{3+} doped crystals show intense emission distributed in the visible-near infrared region with the most intense band centred at 605 nm and characterized by a branching ratio of 0.43. Emission spectrum of Dy^{3+} doped crystals is dominated by a band centred at 575 nm and characterized by a branching ratio of 0.58. It has been concluded that the systems under study are potential laser materials able to generate visible emission upon GaN/InGaN laser diode pumping.

3

Optical Spectroscopy of the Nd^{3+} Luminescence Centres in the Sr_{4}B_{14}O_{25}:Nd Crystal

76%

Padlyak B., Ryba-Romanowski W., Lisiecki R., Oseledchik Y., Prosvirnin A., Kudryavtcev D., Svitanko N.

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issue 1

104-110

EN

Optical absorption, emission and luminescence kinetics of Nd^{3+} centres in the new borate crystal with Sr_{4}B_{14}O_{25}:Nd (Nd content 0.2 wt.%) composition are investigated and analysed. The oscillator strengths (P_{theor} and P_{exp}) for observed absorption transitions and phenomenological intensity parameters Ω_t (Ω_2=1.59×10^{-20} cm^{-1}, Ω_{4} = 2.06 × 10^{-20} cm^{-1}, and Ω_{6} = 2.28 × 10^{-20} cm^{-1} were calculated based on the standard Judd-Ofelt theory. Using Ω_t parameters the radiative transitions rates (W_{r}), branching ratios (β) and radiative lifetime (τ_{rad}) for Nd^{3+} centres in the Sr_{4}B_{14}O_{25}:Nd crystal were calculated and analysed. Measured lifetime (τ_{exp} = 105 and 93 μs at T = 10 and 300 K, respectively) is compared with this calculated (τ_{rad} = 331 μs) and quantum efficiency for Nd^{3+} centres from ^{4}F_{3/2} emitting level in the Sr_{4}B_{14}O_{25}:Nd crystal is estimated (η ≅ 30%). Incorporation peculiarities and local structure of Nd^{3+} luminescence centres in the Sr_{4}B_{14}O_{25} crystal and corresponding glass with 4SrO-7B_{2}O_{3} composition are discussed on the basis of referenced X-ray diffraction data and presented results.

4

Spectroscopic Properties of Pr^{3+} Ion in Various Tellurite Glasses

76%

Burtan B., Cisowski J., Wasylak J., Lisiecki R., Ryba-Rymanowski W., Jarząbek J., Reben M.

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vol. 126

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issue 6

1269-1271

EN

The goal of this work was to investigate the spectroscopic properties of Pr^{3+} ions (of a comparable concentration of the order of 0.2 mol/dm^3) embedded in the tellurite glass matrix, i.e. TeO_2-WO_3-PbO modified with lanthanum and lutetium oxides. The difference is that the last components of both glasses provide ions which are optically inactive within the 4f shell, since this shell is completely empty for La^{3+} ion and completely filled for Lu^{3+} ion. The absorption and fluorescence spectra of Pr^{3+} doped in tellurite glass has been recorded and analyzed in terms of the Judd-Ofelt theory. The studies of the glasses comprised ellipsometric, spectrophotometric and photoluminescence measurements. The ellipsometric studies yield the refraction index dispersion which appears to be quite similar for all the studied glasses. From the spectrophotometric measurements, the absorption spectra have been obtained which, for Pr^{3+}-doped samples, have been analyzed in terms of the Judd-Ofelt theory. Finally, the photoluminescence studies demonstrate a clear visible emission from ^3P_0 level to lower-lying states of Pr^{3+} ion.

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3 Acta Physica Polonica A

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1 Michalik D.

1 Oseledchik Y.

1 Padlyak B.

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1 Prosvirnin A.

1 Reben M.

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1 Solarz P.

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1 Strzęp A.

1 Svitanko N.

1 Wasylak J.

The Effect of Synthesis Parameters on Luminescence Properties of Ca-α-Sialon:Eu2+

Czochralski Growth and Optical Properties οf (Lu_{x}Gd_{1-x})_2SiO_5 Solid Solution Crystals Single Doped with Sm^{3+} and~Dy^{3+}

Optical Spectroscopy of the Nd^{3+} Luminescence Centres in the Sr_{4}B_{14}O_{25}:Nd Crystal

Spectroscopic Properties of Pr^{3+} Ion in Various Tellurite Glasses