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Luminescence Spectra of ZnAl_2O_4:Cr^{3+} Spinel Nanopowders

100%

Luc H., Nguyen T., Nguyen V., Suchocki A., Kamińska A., Le V., Nguyen V., Luong T.

Acta Physica Polonica A

2003

vol. 104

issue 6

581-587

The synthetic ZnAl_2O_4 spinels doped with Cr^{3+} ions are prepared from ZnSO_4, Al_2(SO_4)_3, and Cr_2(SO_4)_3. The spinel single phase is detected from X-ray diffraction. Luminescence properties of Cr^{3+} in ZnAl_2O_4 were studied by low temperature luminescence and decay measurements. Four luminescence lines at 14570, 14520, 14460, and 14330 cm^{-1} were found to originate from structure distortion and the line at 14175 cm^{-1} - from chromium pairs. The broad emission band at about 13540 cm^{-1} is considered to arise from a new Cr^{3+} center in ZnCr_2O_4.

Femtosecond Optical Breakdown as a Source of the Extreme States of Matter

85%

Janulewicz K., Rehman Z., Nguyen V., Le N., Tran K., Grigorov Y.

Acta Physica Polonica A

2018

vol. 133

issue 2

292-295

It is well known that from the two fundamental thermodynamic parameters pressure p is much more efficient in transformation of the matter state than temperature T. Optical breakdown in a form of microexplosion proved to be a simple, cheap, and efficient source of transient extreme pressure and temperature. Our interest is focused on the breakdown performed with femstosecond laser pulses both on a surface and in the bulk of material. The paper delivers some examples of the transformation effects observed mostly in the transparent dielectrics under irradiation with femtosecond laser pulses.

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2 Acta Physica Polonica A

1 2018

1 2003

2 Nguyen V.

1 Grigorov Y.

1 Janulewicz K.

1 Kamińska A.

1 Le N.

1 Le V.

1 Luc H.

1 Luong T.

1 Nguyen T.

1 Rehman Z.

1 Suchocki A.

1 Tran K.

Search results

Luminescence Spectra of ZnAl_2O_4:Cr^{3+} Spinel Nanopowders

Femtosecond Optical Breakdown as a Source of the Extreme States of Matter