Dinesh P Sai, Ratnakaram Y C, Seshadri M, Kumar M, Rajesh D
Department of Physics, Sri Venkateswara University, Tirupati, Andhra Pradesh, India.
Department of Physics, Koneru Lakshmaiah Education Foundation, Hyderabad, Telangana, India.
Luminescence. 2025 May;40(5):e70191. doi: 10.1002/bio.70191.
The spectroscopic analysis of singly doped Eu and codoped Dy/Eu lithium tetraborate (LiTeBo) glasses has been carried out to explore the effects of various alkaline earth and alkali components. The analysis involved techniques such as XRD, SEM, FTIR, optical absorption, photoluminescence, and decay spectral profiles. From the optical absorption spectra of Eu doped glasses, the bonding properties, optical energy band gaps, nephlauxetic ratios, and Urbach energies were obtained. From the emission spectra, color coordinates, correlated color temperatures, and color purities were obtained. The occurrence of energy transfer from Dy to Eu is confirmed across all glass samples by analyzing the emission spectra, assessing the overlap in the spectral regions between the Eu excitation and Dy emission, and evaluating the fluorescence decay curves. The emission spectra of glasses codoped with Dy/Eu ions provided excitation wavelengths, 350, 364, 387 and 394 nm. From the emission transitions, the transitions originated from F to H, H of Dy ion, and from D to F of Eu ion indicate the creation of reddish-orange light. The CIE chromaticity coordinates shift from reddish to reddish-orange color along with the excitation wavelengths 350, 364, 387 and 394 nm.
对单掺杂铕（Eu）以及共掺杂镝（Dy）/铕的四硼酸锂（LiTeBo）玻璃进行了光谱分析，以探究各种碱土金属和碱成分的影响。该分析涉及X射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、光吸收、光致发光以及衰减光谱等技术。从铕掺杂玻璃的光吸收光谱中，获得了键合特性、光学能带隙、光谱加宽比以及乌尔巴赫能量。从发射光谱中，获得了色坐标、相关色温以及色纯度。通过分析发射光谱、评估铕激发和镝发射光谱区域的重叠情况以及评估荧光衰减曲线，证实了在所有玻璃样品中都发生了从镝到铕的能量转移。镝/铕离子共掺杂玻璃的发射光谱提供了350、364、387和394nm的激发波长。从发射跃迁来看，源自镝离子的F到H、H的跃迁以及源自铕离子的D到F的跃迁表明产生了红橙色光。随着激发波长350、364、387和394nm的变化，国际照明委员会（CIE）色度坐标从红色向红橙色转变。
