Glass composition and excitation wavelength dependence of the luminescence of Eu3+ doped lead borate glass

Abstract

Articles you may be interested inEnergy transfer characteristics of silicate glass doped with Er3+, Tm3+, and Ho3+ for ∼2 μm emission This work explores the relationship between the bandwidth of luminescence spectral features and their relative intensities, using glasses doped with europium, Eu 3þ , over a wide composition range. Glasses of composition (B 2 O 3 ) 70 (PbO) 29 (0.5Eu 2 O 3 ) 1 and (B 2 O 3 ) z (PbO) 99.6-z (0.5Eu 2 O 3 ) 0.4 , (z ¼ 20, 30, 40, 60, 70), were prepared by the melting-quenching technique. Variable-wavelength measurements by the prism-coupling method enabled interpolation of refractive index at selected wavelengths. Diffuse reflectance spectra confirmed the incorporation of Eu 3þ into the glass, and scanning electron microscopy displayed that this was in a homogeneous manner. Vibrational spectra showed a change in boron coordination from BO 3 to BO 4 units with increase of PbO content in the glass. Multi-wavelength excited luminescence spectra were recorded for the glasses at temperatures down to 10 K and qualitative interpretations of spectral differences with change of B 2 O 3 content are given. The quantitative analysis of 5 D 0 luminescence intensity-bandwidth relations showed that although samples with higher boron content closely exhibit a simple proportional relationship with band intensity ratios, as expected from theory, the expression needs to be slightly modified for those with low boron content. The Judd-Ofelt intensity analysis of the 5 D 0 emission spectra under laser excitations at low temperature gives X 2 values within the range from (3.9-6.5) Â 10 À20 cm 2 , and X 4 in the range from (4.1-7.0) Â 10 À20 cm 2 , for different values of z. However, no clear monotonic relation was found between the parameter values and composition. The Judd-Ofelt parameters are compared with those from other systems doped with Eu 3þ and are found to lie in the normal ranges for Eu 3þ -doped glasses. The comparison of parameter values derived from the 10 K spectra with those from room temperature spectra for our glasses, which are fairly constant for different compositions, shows that site selection occurs at low temperature.

Structural and emission properties of Eu3+‐doped alkaline earth zinc‐phosphate glasses for white LED applications

“…Eu 3+ has also been preferred as a structural probe in determining the site occupancy and local symmetry in the host lattice . The luminescent properties and potential applications of Eu 3+ ions have been reported in many types of glassy host materials, eg, silicates, borates, phosphate, tungstate, and tellurite . Glasses are preferred over crystalline materials due to certain unique advantages such as high durability, simpler manufacturing technique, lower production cost, and excellent thermal and mechanical stabilities.…”

Phenomenon of Eu3+ self-reduction induced by B2O3 configuration structure in sodiumborate glasses

“…15 The researchers concluded that addition of a network modifier in borate glasses could produce the conversion of the triangular [BO 3 ] structure units to negative charged [BO 4 ] tetrahedral units. 16,17 However, most reports believed that Eu 3þ can be reduced by inequivalence substitution and importantly, can be shield by [BO 4 ] tetrahedral avoiding oxidation. [18][19][20] In our studies, oppositely, the Eu 3þ reduction effect can be formed in the structure environment consisted with plenty of [BO 3 ] units in borate glasses.…”

The effects of the increasing number of the same chromophore on photosensitization of water-soluble cyclen-based europium complexes with potential for biological applications

“…This should be induced by the presence in solution of a mixture of two distinct coordination environments associated with the square antiprismic and twisted square antiprismic isomers. 19 From Fig. 7, a clear distinction of isomers Eu-o-2L and Eu-p-2L from their emission spectra could be achieved.…”