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首页> 外文期刊>RSC Advances >Correlation of crystal structure and optical properties of Ba0.97Nd0.0267Ti(1-x)WxO3 perovskite
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Correlation of crystal structure and optical properties of Ba0.97Nd0.0267Ti(1-x)WxO3 perovskite

机译：Ba0.97Nd0.0267Ti（1-x）WxO3钙钛矿的晶体结构与光学性质的相关性

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The Ba _(0.97) Nd _(0.0267) Ti _((1? x )) W _( x ) O _(3) (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 W ~(6+) 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 ( E _(g) ) and Urbach energy ( E _(u) ) values were calculated from the absorption spectra. The emission spectra exhibited three prominent peaks located at 880, 1058 and 1340 nm corresponding to the ~(4) F _(3/2) → ~(4) I _(9/2,11/2,13/2) transition levels, respectively. They also showed a decrease in the intensity of emission spectra following the addition of W ~(6+) ions. This decrease is due to the slight changes in the crystal environment around Nd ~(3+) 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.
机译：在900°C下制备具有单相四方结构的Ba _（0.97）Nd _（0.0267）Ti _（（1？x））W _（x）O _（3）（BNT _（x））钙钛矿使用熔盐法。用拉曼光谱，傅立叶变换红外光谱（FT-IR），吸收光谱（Vis-NIR）和光致发光光谱（PL）在10–300 K的温度范围内研究了晶体结构与光学性质之间的相关性。 BNT _（x）陶瓷。拉曼分析和FT-IR表明，W〜（6+）离子被充分掺入到BNT_（x）晶格中。在400–1000 nm的波长范围内记录了光吸收光谱。由吸收光谱计算出光学带隙（E _（g））和乌尔巴赫能（E _（u））值。发射光谱在880、1058和1340 nm处显示三个显着的峰，对应于〜（4）F _（3/2）→〜（4）I _（9 / 2,11 / 2,13 / 2）跃迁级别。加入W〜（6+）离子后，它们的发射光谱强度也降低了。这种下降是由于Nd〜（3+）附近晶体环境的微小变化和非辐射能量转移引起的。根据PL测量，对功率激励密度的研究证实，需要两个低能量的光子来产生下转换（DC）发射，这意味着它们也可能作为DC材料具有重要的应用。

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