Abstract
Two optimized glasses were prepared with composition 10ZnO-10Gd(2)O(3)-10BaO-69P(2)O(3)-1Pr(2)O(3) (1ZGPr) and 10ZnO-10GdF(3)-10BaO-69P(2)O(3)-1Pr(2)O(3) (2ZGPr) by melt-quenching technique and study their structural, optical, physical and emission properties. In the absorption spectra seven absorption bands were observed corresponding to transition from 3H4 state at 443 nm (P-3(2)), 467 nm (P-3(1)), 481 nm (P-3(0)), 589 nm (D-1(2)) in visible region and 1438 nm (F-3(4)), 1527 nm (F-3(3)) and 1940 nm (F-3(2)) in NIR-region. The trend observed for JO-parameters for both 1ZGPr and 2ZGPr is omega(4)>omega(6)>omega(2). The 2ZGPr has higher value of omega 2 parameter value than 1ZGPr, showing more covalency and asymmetric environment around Pr3+-ions. Emission in NIR region exhibits three f-f transition located at 870 nm (P-3(1) ->( 1)G(4)), 1040 nm (D-1(2) -> F-3(3), F-3(4)), and 1470 nm (D-1(2) -> (1)G(4)). The P-3(0) -> F-3(2) (in visible) and D-1(2) ->( 1)G(4) (in NIR region) transitions has higher branching ratio and stimulated emission cross section for 2ZGPr glass than 1ZGPr glass. The Full-width-half-maxima (FWHM) is analyzed for transition at 870 nm is 61 nm for 1ZGPr and 58 nm for 2ZGPr glass. The possibility of efficient signal-amplification in E-band, S-band due to affirmative emission of Pr3+-ions within broadband wavelength region in 1ZGPr and 2ZGPr glasses with transition at 1470 nm covering E-, S- C-and L-band. The assessed values of color-coordinates (x, y) are (0.57, 0.36) and (0.54, 0.36) for 1ZGPr and 2ZGPr respectively. Hence 2ZGPr glass has enough potential enough capability to emit bright red-laser at 640 nm.