Abstract
Optical absorption, excitation and emission spectra of Nd<sup>3+</sup> in PLZT ceramics have been studied. Based on the Judd-Ofelt (J-O) theory, the J-O intensity parameters are calculated to be Ω<sub>2</sub>=0.7199x10<sup>-20</sup> cm<sup>2</sup>, Ω<sub>4</sub>=1.045x10<sup>-20</sup> cm<sup>2</sup>, Ω<sub>6</sub>=0.9234x10<sup>-20</sup> cm<sup>2</sup> from the absorption spectrum of Nd<sup>3+</sup>-doped PLZT. The J-O intensity parameters have been used to calculate the radiative lifetime (0.385 ms) of the excited <sup>4</sup>F<sub>3/2</sub> level. The stimulated emission cross-sections and the fluorescence branch ratios for the <sup>4</sup>F<sub>3/2</sub> -> <sup>4</sup>I<sub>J</sub> transitions are also evaluated. We have also measured 1.068 mm fluorescence lifetime (0.168 ms) and calculated its Quantum efficiency (0.44). Under 807 nm excitation, the green and red upconversion luminescence from Nd<sup>3+</sup> centers in the ceramic was observed at room temperature. Analysis reveals that Nd<sup>3+</sup>-doped PLZT is promising for the use as efficient optically amplifying or zero-loss electro-optical devices in telecommunication networks.
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