Superiority of shortwave transparent glasses with moderate phonon energy in achieving effective radiations from 1D2 level of Pr3+

Radiation-level D-1(2) adaptive fluorophosphate glasses (NBFP) have been exhibited and relevant transition emissions of Pr3+ have been quantitatively characterized. Intense visible fluorescence is proved to generate from D-1(2) level principally and the quantum yield (QY) of emissions originating from this level is as high as 7.94% in 500-900 nm, indicating the decisive significance of the D-1(2) level in reddish-orange fluorescence of NBFP glasses. Effective broadband 1.47 mu m near-infrared (NIR) emission ascribed to D-1(2)->(1)G(4) transition has been observed, meanwhile, the full-width at half-maximum is obtained to be 141 nm and the maximum stimulated emission cross-section is derived to be 5.75 x 10(-21)cm(2), suggesting the effectiveness of the NIR emission from the initial level D-1(2) in the specific NBFP glasses. In view of absolute radiation parameters and fluorescence branch ratios, net emission photon number of the attractive NIR emission is expected to be 4.5 x 10(14) cps under 453 nm laser pumping with 82.05 mW power, and corresponding QY is anticipated to be 2.0%. High shortwave transparency and moderate phonon energy are confirmed to be two important indicators for exploring suitable host materials in achieving effective radiations from D-1(2) level of Pr3+, revealing the forward-looking applications of fluorophosphate glasses as broadband NIR amplifiers and irradiative luminescence sources.