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538.9+544+546 (1) |
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SM ISO690:2012 VERLAN, Victor, BORDIAN, Olga, CULEAC, Ion, YOVU, M., BULHAK, Ion, ZUBAREV, Victor. PL properties of the coordination compound Eu(DBM)3(PH3PO)H2O. In: Materials Science and Condensed Matter Physics, Ed. 9, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, Ediția 9, p. 314. |
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Materials Science and Condensed Matter Physics Ediția 9, 2018 |
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Conferința "International Conference on Materials Science and Condensed Matter Physics" 9, Chișinău, Moldova, 25-28 septembrie 2018 | |||||||
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CZU: 538.9+544+546 | |||||||
Pag. 314-314 | |||||||
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A new coordination compound Eu(DBM)3(Ph3PO)H2O was synthesized and charcaterized by photoluminescent (PL) spectroscopy (DBM stands for dibenzoylmethane and Ph3PO for triphenylphosphine oxide). PL spectra have been investigated at room temperature under excitation of light beam 337 and 405 nm. PL relaxation characteristics were registered under excitation of nitrogen pulsed laser, with the time resolution of 50 μs. The PL quantum yield (QY) was measured by the integration sphere. PL emission spectra of Eu(DBM)3(Ph3PO)H2O powder and solution samples show a number of emission bands associated with the 5D0→7Fj (j = 0,1,2,3,4) transitions of Eu3+ ion under the excitation of UV light [1,2]. The emission bands can be observed at 580, 590, 612 - 615, 651, and 700 nm. The dominant PL emission band is registered around ~ 612 nm. These PL bands can be attributed to internal 4f ß> 4f transitions 5D0 → 7 Fj. These transitions can be interpreted from the viewpoint of the surrounding environment of Eu3+ ion and removal of internal interdiction for transitions in electronic shields of Eu3+ ion as a result of ligands interactions [1-3]. Deconvolution of the PL band at 612 nm shows that the FWHM of the main emission band at 611.2 nm is less than 3 nm. The integrated intensity ratio has been calculated both for powder samples as well as for solution samples and represents I2(5D0 → 7F2)/I1(5D0 → 7F1) = 6.9. The splitting of the 5D0 → 7F1 transition appears to have three components with almost the same intensity. This feature suggests that the Eu(DBM)3(Ph3PO)H2O compound belongs to low triclinic symmetry crystal system [2]. The temporal characteristics of PL relaxation were registered under excitation of nitrogen pulsed laser, with the time resolution of 50 μs. The PL decay profile registered at 612 nm exhibits a single exponential behavior with the characteristic time 0.37 ms. The experimental results of PL and its kinetics were analyzed using the Judd-Ofelt method from which PL parameters were obtained: the quantum yield, life time, and the oscillator force of the electrical dipole, etc. The new compound Eu(DBM)3(Ph3PO)H2O is an attractive candidate for various applications in biology, medicine, and optoelectronics. |
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