四方晶系
光致发光
分析化学(期刊)
拉曼光谱
离子
谱线
吸收光谱法
带隙
Crystal(编程语言)
材料科学
吸收(声学)
晶体结构
发射光谱
红外线的
化学
光学
结晶学
光电子学
物理
程序设计语言
计算机科学
有机化学
色谱法
天文
复合材料
作者
Z. Raddaoui,Badreddine Smiri,A. Maaoui,J. Dhahri,Ridha Mghaieth,N. Abdelmoula,K. Khirouni
出处
期刊:RSC Advances
[The Royal Society of Chemistry]
日期:2018-01-01
卷期号:8 (49): 27870-27880
被引量:36
摘要
The Ba0.97Nd0.0267Ti(1-x)W x O3 (BNT x ) pervoskite with a single phase tetragonal structure was prepared at 900 °C using the Molten salt method. Raman spectra, Fourier transform infrared spectra (FT-IR), absorption spectra (Vis-NIR) and photoluminescence spectra (PL) in the temperature range from 10-300 K were used to investigate the correlations between the crystal structure and the optical properties of BNT x ceramics. Raman analyses and FT-IR indicated that the W6+ ions are incorporated sufficiently into into the BNT x lattice. The optical absorption spectra were recorded in the wavelength range of 400-1000 nm. The optical band gap (Eg) and Urbach energy (Eu) values were calculated from the absorption spectra. The emission spectra exhibited three prominent peaks located at 880, 1058 and 1340 nm corresponding to the 4F3/2 → 4I9/2,11/2,13/2 transition levels, respectively. They also showed a decrease in the intensity of emission spectra following the addition of W6+ ions. This decrease is due to the slight changes in the crystal environment around Nd3+ and the non-radiative energy transfer. According to the PL measurements, the study of power-excitation density confirmed that two photons at low energy are required to create the down-conversion (DC) emissions, implying that they may also have important applications as DC materials.
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