掺杂 Cr3+ 的二氧化硅纳米磷的结构和光学特性

IF 1.6 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
L. F. Koao, R. A. Phokojoe, R. G. Moji, S. V. Motloung, T. E. Motaung, H. C. Swart
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引用次数: 0

摘要

采用溶胶-凝胶法合成了 SiO2:x% Cr3+(0 ≤ x ≤ 8)纳米粉体样品。研究了 Cr3+ 掺杂浓度对 SiO2 纳米粒子的影响,以探讨其在发光二极管(LED)中的应用。详细研究了未掺杂和掺杂 Cr3+ 的二氧化硅纳米粒子的结构和光学特性。X 射线衍射 (XRD) 结果证实,未掺杂的 SiO2(A-SiO2)纳米粉体为非晶相。然而,当 Cr3+ 含量高于 0.8% 时,会出现因铬(III)氧化物(R-Cr2O3)的斜方体结构而产生的次生峰。紫外-可见光谱(UV-Vis)显示,未掺杂样品的反射峰在 320 纳米左右。结果表明,当 Cr3+ 浓度增加时,在 309、419 和 553 纳米波长处会出现反射峰,这是因为 Cr2O3 晶格的存在。光致发光(PL)结果显示,随着 Cr3+ 含量的增加,蓝色和近红色的最大峰值分别出现在 2.82 和 1.89 eV 左右。这些峰可能是二氧化硅和 R-Cr2O3 中的缺陷造成的。未掺杂和掺杂 Cr3+ 的二氧化硅的发射峰与紫外可见光结果非常吻合。国际照明色度显示,当 Cr3+ 浓度高于 0.8% 时,随着 Cr3+ 浓度的增加,颜色会从黄色变为蓝色。研究表明,掺杂 Cr3+ 的二氧化硅有可能应用于照明用蓝色和黄色 LED 芯片。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Structural and optical properties of Cr3+ doped SiO2 nanophosphor

Structural and optical properties of Cr3+ doped SiO2 nanophosphor

SiO2:x% Cr3+ (0 ≤ x ≤ 8) nanopowder samples were synthesized using the sol-gel method. The effect of Cr3+ doping concentration on the SiO2 nanoparticles was studied for possible application in light-emitting diodes (LEDs). Structure and optical properties of undoped and Cr3+ doped SiO2 nanoparticles were investigated in detail. X-ray diffraction (XRD) results confirmed the amorphous phase for undoped SiO2 (A-SiO2) nanopowder. However, above 0.8% Cr3+ there were secondary peaks due rhombohedral structure of chromium (III) oxide (R-Cr2O3). Ultraviolet-visible spectroscopy (UV-Vis) spectra showed a reflectance peak at around 320 nm for the undoped sample. The results showed that when the concentration of Cr3+ is increased there was an emergence of reflectance peaks at around 309, 419, and 553 nm which were attributed to the presence of the Cr2O3 lattices. The photoluminescence (PL) results revealed that with an increase in the amount of Cr3+, the maximum peaks in blue and near red emerge at around 2.82 and 1.89 eV, respectively. Those peaks may be due to defects within both SiO2 and R-Cr2O3. The emission peaks of undoped and Cr3+ doped SiO2 match well with the Uv-vis results. The international illumination colour chromaticity showed that above 0.8% Cr3+ the colour shifts from yellow to blue with an increase in Cr3+ concentration. The investigation indicated that Cr3+ doped SiO2 have a potential application in blue and yellow LED chips for lighting.

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来源期刊
Indian Journal of Physics
Indian Journal of Physics 物理-物理:综合
CiteScore
3.40
自引率
10.00%
发文量
275
审稿时长
3-8 weeks
期刊介绍: Indian Journal of Physics is a monthly research journal in English published by the Indian Association for the Cultivation of Sciences in collaboration with the Indian Physical Society. The journal publishes refereed papers covering current research in Physics in the following category: Astrophysics, Atmospheric and Space physics; Atomic & Molecular Physics; Biophysics; Condensed Matter & Materials Physics; General & Interdisciplinary Physics; Nonlinear dynamics & Complex Systems; Nuclear Physics; Optics and Spectroscopy; Particle Physics; Plasma Physics; Relativity & Cosmology; Statistical Physics.
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