Department of Physics, Rajeev Gandhi Memorial College of Engineering and Technology, Nandyal, India.
Glass and Glass-Ceramics Laboratory, Department of Physics, Rajeev Gandhi Memorial College of Engineering and Technology, Nandyal, India.
Luminescence. 2024 Jul;39(7):e4822. doi: 10.1002/bio.4822.
Holmium (Ho)-doped boro-bismuth-germanate glasses having the chemical composition (30-x)BO + 20GeO + 20BiO + 20NaO + 10YO + xHoO, where x = 0.1, 0.5, 1.0, and 2.0 mol% were prepared by melt-quenching technique. The prepared glasses were examined for thermal, optical, vibrational, and photoluminescent properties. The prepared glasses were found to be thermally very stable. The optical bandgap and Urbach energies of 0.1 mol% HoO-doped boro-bismuth-germanate glass were calculated to be 3.3 eV and 377 MeV, respectively, using the absorption spectrum. The Judd-Ofelt analysis was performed on the 0.1 mol% HoO-doped glass and compared the obtained parameters with literature. The branching ratio (β) and emission cross-section (σ) of the green band were determined to be 0.7 and 0.24 × 10 cm, respectively. Under 450 nm excitation, a strong green emission around 550 nm was observed and assigned to the (S + F) → I (Ho) transition. Upon an increase of HoO content from 0.1 to 2.0 mol%, the intensities of all observed emission bands as well as decay time of the (S + F) → I transition have been decreased gradually. The reasons behind the decrease in emission intensity and decay time were discussed. The strong green emission suggests that these glasses may be a better option for display devices and green emission applications.
掺钬硼铋锗酸盐玻璃具有化学组成（30-x）BO + 20GeO + 20BiO + 20NaO + 10YO + xHoO，其中 x = 0.1、0.5、1.0 和 2.0 mol%，采用熔融淬火技术制备。研究了制备玻璃的热、光、振动和光致发光性能。结果表明，所制备的玻璃具有非常好的热稳定性。通过吸收光谱计算出 0.1 mol% HoO 掺杂硼铋锗酸盐玻璃的光学带隙和 Urbach 能分别为 3.3 eV 和 377 MeV。对 0.1 mol% HoO 掺杂玻璃进行了 Judd-Ofelt 分析，并将得到的参数与文献进行了比较。确定了绿光带的分支比（β）和发射截面（σ）分别为 0.7 和 0.24 × 10-20 cm2。在 450nm 激发下，观察到强度较大的 550nm 附近的绿光发射，归因于（S + F）→I（Ho）跃迁。随着 HoO 含量从 0.1 增加到 2.0 mol%，所有观察到的发射带的强度以及（S + F）→I 跃迁的衰减时间都逐渐降低。讨论了发射强度和衰减时间降低的原因。强烈的绿光发射表明，这些玻璃可能是显示器件和绿光发射应用的更好选择。
