Near UV excited photoluminescence studies of oxyfluoride-phosphosilicate glasses doped with various Dy3+ amounts for natural white light generation

초록

In this work, Dy3+-doped oxyfluoride-phosphosilicate glasses with (40-x)P<inf>2</inf>O<inf>5</inf> + 10SiO<inf>2</inf> + 10AlF<inf>3</inf> + 20LiF + 10ZnO + 10ZnF<inf>2</inf> + xDy<inf>2</inf>O<inf>3</inf> (0.1 ≤ x ≤ 4.0 mol%) compositions were fabricated by melt quenching. These glasses were studied by the optical band gap (3.51˗3.28 eV) and Urbach (0.182–0.263 eV) energies. The changes in the JO parameters from Ω<inf>2</inf> > Ω<inf>4</inf> > Ω<inf>6</inf> to Ω<inf>2</inf> > Ω<inf>6</inf> > Ω<inf>4</inf> and Y/B ratios from 1.968 to 2.006 were observed with the addition of Dy3+. Dipole-dipole interaction and cross-relaxation channels were confirmed a reduction in decay times (437˗117 μs) and PL quenching. Emission cross-section (32.25 × 10−21 cm2), gain bandwidth (44.09 × 10−27 cm3), optical gain (19.64 × 10−24 cm2 s), and quantum efficiency (68 %) values of the optimal Dy0.5 glass are superior relative to other reports for the 4F<inf>9/2</inf> → 6H<inf>13/2</inf> transition, implying its potential use in yellow lasers and amplifier design. Moreover, the intense yellow emission relative to the blue band in the current glasses leads to the generation of natural white light (CCT: 4200–4400 K) upon 350 nm excitation. © 2025 Elsevier B.V.

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