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Influence of WO3 content on the optical properties of Eu3+-doped Bi2O3-B2O3-WO3 glasses

Wang Z., Tong R., Lin H., Yang D.

Materials Science Poland

2009

Vol. 27, No. 2

493--499

Eu3+-doped bismuth borate based glasses with various contents of WO3 were fabricated by melt quenching. Optical properties of Eu3+ ions in these ternary systems and their dependence on the WO3 content were investigated: absorption and emission spectra were studied as the WO3 molar ratio was adjusted from 1 to 5 mol %. The Judd-Ofelt parameters were calculated from the emission spectra and expressed in terms of reduced matrix U t (t = 2, 4, 6) characters for optical transitions. The influence of WO3 content on the Judd-Ofelt intensity parameter ?2 was also investigated. Experimental results lead us to conclude that the optimum luminescence of Eu3+-doped bismuth borate based glasses is achieved if the WO3 content is 3 mol %.

Functions of Eu3+ ions in materials with CdS nanoparticles and oxide matrices

Kłonkowski A.M., Szałkowska I.

Materials Science Poland

2005

Vol. 23, No. 1

253--260

CdS semiconductor nanoparticles are used to improve the luminescence properties of europium(III) -doped matrices such as silica xerogel and silica nanoparticles, both prepared by a sol-gel method as well as zeolite NaY. The impregnation of CdS nanosized clusters on an Eu3+-doped matrix enhances the luminescence of both dopants. Additionally, the luminescence of the materials can be improved by thermal treatment and by changing the Eu3+/CdS molar ratio. Eu3+ emission spectra show changes in the intensities of the bands at 595 and 612 nm, depending on the structural order of the oxide matrices.