L. F. Koao, R. A. Phokojoe, R. G. Moji, S. V. Motloung, T. E. Motaung, H. C. Swart
{"title":"掺杂 Cr3+ 的二氧化硅纳米磷的结构和光学特性","authors":"L. F. Koao, R. A. Phokojoe, R. G. Moji, S. V. Motloung, T. E. Motaung, H. C. Swart","doi":"10.1007/s12648-024-03392-0","DOIUrl":null,"url":null,"abstract":"<p>SiO<sub>2</sub>:x% Cr<sup>3+</sup> (0 ≤ x ≤ 8) nanopowder samples were synthesized using the sol-gel method. The effect of Cr<sup>3+</sup> doping concentration on the SiO<sub>2</sub> nanoparticles was studied for possible application in light-emitting diodes (LEDs). Structure and optical properties of undoped and Cr<sup>3+</sup> doped SiO<sub>2</sub> nanoparticles were investigated in detail. X-ray diffraction (XRD) results confirmed the amorphous phase for undoped SiO<sub>2</sub> (A-SiO<sub>2</sub>) nanopowder. However, above 0.8% Cr<sup>3+</sup> there were secondary peaks due rhombohedral structure of chromium (III) oxide (R-Cr<sub>2</sub>O<sub>3</sub>). 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 Cr<sup>3+</sup> is increased there was an emergence of reflectance peaks at around 309, 419, and 553 nm which were attributed to the presence of the Cr<sub>2</sub>O<sub>3</sub> lattices. The photoluminescence (PL) results revealed that with an increase in the amount of Cr<sup>3+</sup>, 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 SiO<sub>2</sub> and R-Cr<sub>2</sub>O<sub>3</sub>. The emission peaks of undoped and Cr<sup>3+</sup> doped SiO<sub>2</sub> match well with the Uv-vis results. The international illumination colour chromaticity showed that above 0.8% Cr<sup>3+</sup> the colour shifts from yellow to blue with an increase in Cr<sup>3+</sup> concentration. The investigation indicated that Cr<sup>3+</sup> doped SiO<sub>2</sub> have a potential application in blue and yellow LED chips for lighting.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.6000,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Structural and optical properties of Cr3+ doped SiO2 nanophosphor\",\"authors\":\"L. F. Koao, R. A. Phokojoe, R. G. Moji, S. V. Motloung, T. E. Motaung, H. C. Swart\",\"doi\":\"10.1007/s12648-024-03392-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>SiO<sub>2</sub>:x% Cr<sup>3+</sup> (0 ≤ x ≤ 8) nanopowder samples were synthesized using the sol-gel method. The effect of Cr<sup>3+</sup> doping concentration on the SiO<sub>2</sub> nanoparticles was studied for possible application in light-emitting diodes (LEDs). Structure and optical properties of undoped and Cr<sup>3+</sup> doped SiO<sub>2</sub> nanoparticles were investigated in detail. X-ray diffraction (XRD) results confirmed the amorphous phase for undoped SiO<sub>2</sub> (A-SiO<sub>2</sub>) nanopowder. However, above 0.8% Cr<sup>3+</sup> there were secondary peaks due rhombohedral structure of chromium (III) oxide (R-Cr<sub>2</sub>O<sub>3</sub>). 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 Cr<sup>3+</sup> is increased there was an emergence of reflectance peaks at around 309, 419, and 553 nm which were attributed to the presence of the Cr<sub>2</sub>O<sub>3</sub> lattices. The photoluminescence (PL) results revealed that with an increase in the amount of Cr<sup>3+</sup>, 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 SiO<sub>2</sub> and R-Cr<sub>2</sub>O<sub>3</sub>. The emission peaks of undoped and Cr<sup>3+</sup> doped SiO<sub>2</sub> match well with the Uv-vis results. The international illumination colour chromaticity showed that above 0.8% Cr<sup>3+</sup> the colour shifts from yellow to blue with an increase in Cr<sup>3+</sup> concentration. The investigation indicated that Cr<sup>3+</sup> doped SiO<sub>2</sub> have a potential application in blue and yellow LED chips for lighting.</p>\",\"PeriodicalId\":584,\"journal\":{\"name\":\"Indian Journal of Physics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.6000,\"publicationDate\":\"2024-08-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Indian Journal of Physics\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1007/s12648-024-03392-0\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"PHYSICS, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Indian Journal of Physics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1007/s12648-024-03392-0","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
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.
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.