Abstract
Different concentration of (0.1, 0.2, 0.3, 0.4, 0.5, 1.0 & 1.5) mol% of europium doped lead borate lithium glasses were prepared by melt quenching method. The properties of thermal, photoluminescence & structural were analyzed using DTA, FTIR and emission spectra. Emission spectra was used to evaluate the Judd-Ofelt (JO) parameters. Radiative parameters like stimulated emission cross-sections (σe), effective band width (∆λeff), transition probabilities (A), optical gain bandwidths (σe x ∆λeff), radiative lifetime (τrad) and optical gain (σe x τrad) values were evaluated for the transition 5D0→7Fj (j=1, 2, 3 and 4) of Eu3+ ions. The outcome of transition 5D0→7F4 at its highest value of branching ratios and stimulated emission cross-section are evaluated with the literature. Hence we can could the prepared host glass doped with Eu3+ ions are good fibre amplifiers and it can be used as a red laser.
Highlights
Glasses doped with RE ions are of larger interest due to their use in infrared-to-visible up-converters, solidstate lasers, bulk lasers, waveguide lasers, planar waveguides, temperature sensors, flat panel displays, field emission displays, optical fiber amplifiers, high-density memory devices, high-density frequency domain optical data storage, color display devices and electroluminescent devices [1,2,3]
NA (Numerical aperture) values of the prepared glass samples are between 0.3-0.4, if the NA values are between 0.130.5 such glasses are recommended as primary raw material for creation of optical fibres
The radiative parameters were determined from JO theories like stimulated emission cross-sections, radiative lifetime, total transition probabilities, and effective bandwidth using the equations specified in reference [25, 26] and these values are tabulated in table 4
Summary
Glasses doped with RE ions are of larger interest due to their use in infrared-to-visible up-converters, solidstate lasers, bulk lasers, waveguide lasers, planar waveguides, temperature sensors, flat panel displays, field emission displays, optical fiber amplifiers, high-density memory devices, high-density frequency domain optical data storage, color display devices and electroluminescent devices [1,2,3]. Among all RE ions, europium is a unique component because of the divalent or trivalent valence state. Photonic applications are used Eu3+ ion due to its property of red light emission, which was observed during the transition 5D0 -----7F2 state and it is very sensitivity to minute changes when surrounded by chemicals. The emission from non-degenerate 5D0 to 7Fj (j = 0–6) levels gives site symmetry around active ions and number of sites available for active ions [4,5,6,7]
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