Biomaterials, Biodegradables and Biomimetics Research Group

Papers in Scientific Journals

Time resolved emission spectra and electron paramagnetic resonance studies of Gd3+ doped calcium phosphate glasses.

Abstract

Gadolinium, Gd3+ (4f7 ), containing glasses are particularly interesting owing to their magnetic and optical properties. Gd3+ has an electron paramagnetic resonance (EPR) centre, which is often used as the EPR probe in different matrices. Another important feature of Gd3+ is that emits ultraviolet radiation (UVR) at around 310 – 313 nm from the 6 P7/2 8 S7/2 transition and is suitable for the treatment of skin disease. Here, we report on Gd3+ doped calcium phosphate host glasses with four different concentrations; 0.5 - 4 mol % and labelled as 0.5Gd, 1Gd, 2Gd and 4Gd. A strong emission peak at 310 nm was observed in the reported glasses with excitation at 274 nm. The emission spectra can also be obtained at specific times during the decay. The time resolved emission data was analyzed with three different approaches namely, simple exponential, NED distribution and stretched exponential. The other approaches confirm the single exponential behaviour for all samples with deviation for the 0.5 Gd. The decay associated spectra (DAS) for the 0.5 Gd indicate that both decays have the same origin. The EPR spectrum exhibits several resonance signals characteristic of Gd3+ ions. The stimulated emission cross sections (σ P E×10−21 cm2 ) of the UV emission transition 6 P7/2 8 S7/2 were also reported in the above three approaches.

Journal
Advanced Material Letters
Volume
7
Issue
4
Pagination
277-281
Publisher
VBRI Press
ISSN
0976-3961
URL
http://www.vbripress.com/aml/uploads/56dd2b6ad97631457335146_fullabstratct.pdf
Keywords
calcium phosphate material, EPR studies, Gd3+ glass, time resolved emission spectra
Rights
Open Access
Peer Reviewed
Yes
Status
published
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