Acta Photonica Sinica, Volume. 40, Issue 11, 1646(2011)
Emission Properties of Eudoped NanoLu3Al5O12 Powders by Ultrasonic Atomization and Coprecipitation Method
Eu3+ doped nanoLu3Al5O12 powders were prepared by ultrasonic atomization and coprecipitation method with Lu2O3, Eu2O3 and Al(NO3)3·9H2O as raw materials, and the obtained powders were sintered at various temperature. Xray diffraction and scanning electron microscopy were employed to characterize the particle size and phase composition of the nanopowder. The emission, excitation and phononside band spectra of Eu3+∶Lu3Al5O12 were measured. The result indicated when the sintering temperature was higher than 900℃, the luminous intensity was significantly enhanced and the optimum doping concentration of Eu3+ was 5~7 mol%. The Ω2 and Ω4 parameters of Eu3+ for optical transition were calculated from their emission spectra in terms of reduced matrix U(t) (λ=2,4,6) character for optical transitions. The results indicated that the intensity parameters Ω2 reached to minimum and electronphonon coupling to the maximum when the doping concentration of Eu3+ was ~5 mol%. With the increase of Eu3+ content, the optical parameter increased slightly and the electronphonon coupling became weaker. It suggests that the symmetry becomes weaker, the bands of Eu and O atoms become higher and the covalence of Eu and O atoms increases. The Ω2 of the powder shows an obvious lower value by comparing with those of Eu3+ in glass and crystal matrix, which is result from the symmetrical decreasing of the nanoparticles induced by a large number of defects and structural aberrations.
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HU Yuan, XIA Haiping, ZHANG Li. Emission Properties of Eudoped NanoLu3Al5O12 Powders by Ultrasonic Atomization and Coprecipitation Method[J]. Acta Photonica Sinica, 2011, 40(11): 1646
Received: Jul. 6, 2011
Accepted: --
Published Online: Dec. 12, 2011
The Author Email: Yuan HU (huyuangood@gmail.com)