Singh Harpreet, Singh Devinder, Singh Supreet Pal
Department of Physics, Punjabi University Patiala, (147002), Punjab, India.
Department of Physics, Sri Guru Teg Bahadur Khalsa College, Anandpur Sahib, (140118), Punjab, India.
J Fluoresc. 2024 Aug 21. doi: 10.1007/s10895-024-03865-9.
To investigate the role of PbO as a former or a modifier and effect of its compositional variation on the physical, structural and optical properties, lithium lead borophosphate glasses were synthesized by melt quenching technique. For the physical properties of the prepared glasses, density was measured using the Archimedes principle, which showed an increasing trend from 3.13 to 4.51 with increasing concentrations of lead oxide. Additionally, other physical parameters were calculated based on the measured density values. The structural analysis were performed through X-ray diffraction and Fourier transform infrared spectroscopy. Lack of sharp and characteristic peaks in the XRD spectra confirmed the non crystalline nature of the prepared glasses. Structural units due to PbO, and were identified from the FTIR spectra. Ultraviolet-visible absorption spectroscopy was performed for optical properties and increase in the indirect band gap from 4.80 eV to 4.90 eV was observed. One glass sample was chosen for doping of erbium, neodymium, thulium and ytterbium, for study of their up-conversion properties. The UV-Vis-NIR absorption spectra of erbium, neodymium, and thulium samples were recorded, and wavelength of 980 nm was chosen for excitation. Ytterbium, acting as a sensitizer, facilitated the conversion of the excitation infrared light into visible light. Upon excitation at 980 nm, the erbium-doped sample emitted light at 520 nm, 547 nm, and 665 nm, utilizing excited state up-conversion (ESA) and energy transfer up-conversion (ETU) mechanisms. Similarly, the neodymium-doped sample emitted at 542 nm, 602 nm, and 660 nm, while the thulium-doped sample emitted at 488 nm, 521 nm, and 649 nm. The results of up-conversion indicate that rare earth-doped lithium lead borophosphate glasses are excellent hosts for up-conversion processes.
为了研究氧化铅作为前驱体或改性剂的作用及其成分变化对物理、结构和光学性能的影响，采用熔体淬火技术合成了锂铅硼磷酸盐玻璃。对于制备的玻璃的物理性能，使用阿基米德原理测量密度，结果表明随着氧化铅浓度的增加，密度从3.13增加到4.51呈现上升趋势。此外，基于测量的密度值计算了其他物理参数。通过X射线衍射和傅里叶变换红外光谱进行结构分析。XRD光谱中缺乏尖锐的特征峰证实了所制备玻璃的非晶态性质。从FTIR光谱中识别出了由于氧化铅导致的结构单元。对光学性能进行了紫外-可见吸收光谱分析，观察到间接带隙从4.80 eV增加到4.90 eV。选择一个玻璃样品进行铒、钕、铥和镱的掺杂，以研究它们的上转换性能。记录了铒、钕和铥样品的紫外-可见-近红外吸收光谱，并选择980 nm波长进行激发。镱作为敏化剂，促进了激发红外光向可见光的转换。在980 nm激发下，掺铒样品利用激发态上转换（ESA）和能量转移上转换（ETU）机制在520 nm、547 nm和665 nm处发射光。同样，掺钕样品在542 nm、602 nm和660 nm处发射光，而掺铥样品在488 nm、521 nm和649 nm处发射光。上转换结果表明，稀土掺杂的锂铅硼磷酸盐玻璃是上转换过程的优良基质。
