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Energy transfer phenomenon of Gd3+ to excited ground state of Eu3+ ions in Li2O-BaO-Gd2O3-SiO2-Eu2O3 glasses
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.3 ) Pub Date : 2018-11-06 , DOI: 10.1016/j.saa.2018.11.008
I. Khan , G. Rooh , R. Rajaramakrishna , N. Sirsittapokakun , H.J. Kim , J. Kaewkhao , K. Kirdsiri

Li2O-BaO-Gd2O3-SiO2 glasses with different concentration of Eu3+ ions were developed by the traditional melt quenching technique and characterized via FTIR, absorption, excitation, emission and CIE color coordinates analysis for visible red emission application. The FTIR shows strong band at position 740 cm−1 which is attributed to Si-O-Si symmetric stretching mode. Density and molar volume of LBGSEu glasses increases with Eu3+ ions concentration. The covalent nature of bond between the Eu3+ ions and surrounding ligands was confirmed from the bonding parameter (δ). From absorption spectra JO-parameters and oscillator strength are evaluated for LBGSEu6 glass. From JO-parameters, Eu3+ ions have asymmetric coordination environment and stronger covalency. The phonon line PSB (22,522 cm−1) confirm the phonon energy ≈971 cm−1, that corresponds to the energy of one phonon associated with maximum energy of the vibrational mode couple to Eu3+ ions. Under 275 nm and 393 nm excitation, intense red emission was observed at 613 nm, we observe efficient energy transfer phenomena from Gd3+ → Eu3+ in these glasses. Increasing trend of IR with increasing concentration of Eu2O3 indicates the asymmetric environment around Eu3+ ions in LBGS. Moreover, from JO analysis, LBGS glasses have high capability for red laser device with high lasing power and energy extraction ratio. The fluorescence lifetimes show decreasing trend in lifetime with increasing concentration of Eu2O3 is due to radiative transition. From CIE color coordinate, the CIE color coordinates of LBGSEu6 glass fall in reddish region close to orange region and can be useful for optical display devices.



中文翻译:

Li 2 O-BaO-Gd 2 O 3 -SiO 2 -Eu 2 O 3玻璃中Gd 3+向Eu 3+离子激发基态的能量转移现象

通过传统的熔融淬火技术开发了不同浓度的Eu 3+离子的Li 2 O-BaO-Gd 2 O 3 -SiO 2玻璃,并通过FTIR,吸收,激发,发射和CIE色坐标分析对可见红色发射应用进行了表征。 。FTIR在740cm -1处显示出强带,这归因于Si-O-Si对称拉伸模式。LBGSEu玻璃的密度和摩尔体积随Eu 3+离子浓度的增加而增加。Eu 3+之间键的共价性质从结合参数(δ)确认离子和周围的配体。根据吸收光谱,对LBGSEu6玻璃的JO参数和振荡器强度进行了评估。从JO参数来看,Eu 3+离子具有不对称的配位环境和较强的共价性。声子线PSB(22,522 cm -1)确定了声子能量≈971cm -1,该能量对应于一个声子的能量,该声子与耦合到Eu 3+离子的振动模式的最大能量相关。在275 nm和393 nm激发下,在613 nm处观察到强烈的红色发射,我们观察到这些玻璃中Gd 3+  →Eu 3+的有效能量转移现象。I R的增长趋势随着Eu 2 O 3浓度的增加,表明LBGS中Eu 3+离子周围的环境不对称。而且,从JO分析来看,LBGS眼镜具有高激光功率和高能量提取比的用于红色激光装置的能力。随着Eu 2 O 3浓度的增加,荧光寿命显示出寿命降低趋势是由于辐射跃迁。从CIE颜色坐标来看,LBGSEu6玻璃的CIE颜色坐标落在接近橙色区域的红色区域中,可用于光学显示设备。

更新日期:2018-11-06
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