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

Radiation-level ¹D₂ 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 ¹D₂ 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 ¹D₂ level in reddish-orange fluorescence of NBFP glasses. Effective broadband 1.47 μm near-infrared (NIR) emission ascribed to ¹D₂ → ¹G₄ 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 × 10⁻²¹cm², suggesting the effectiveness of the NIR emission from the initial level ¹D₂ 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 × 10¹⁴cps 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 ¹D₂ level of Pr³⁺, revealing the forward-looking applications of fluorophosphate glasses as broadband NIR amplifiers and irradiative luminescence sources.