Large enhancement of photoluminescence in SrTiO3:Pr3+ powders by fluorhydric acid treatment

He, Xiuxian; Guo, Ruochen; Dong, Wen; Zheng, Fengang; Fang, Liang; Shen, Mingrong

doi:10.1016/j.jlumin.2010.02.026

Cited by 6 publications

(5 citation statements)

References 25 publications

(32 reference statements)

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“…The O1s peak at 533.90 eV corresponds to the surface hydroxyl groups, and the peak at 529.49 eV corresponds to the lattice oxygen in STO. [34] Also, the peak at 531.30 eV can be assigned to the surface oxygen vacancies, which is at large amount and in accordance with reports. [35] The peak centers at 405.03 and 411.80 eV are attributed to Cd 3d 5/2 and Cd 3d 3/2 , which are the characteristic peaks of Cd 2þ in CdS.…”

Section: Characterization Of Stc Heterojunctionsupporting

confidence: 89%

“…A similar result has been reported on CdS composites. [34] It is worth noting that the hydrogen production rate of STC-5% showed a decreasing trend after 3 h of illumination, which can be attributed to the slowing down of the oxidation process of the photocatalytic reaction due to the consumption of sacrificial agents in the reaction process and the accumulation of holes, leading to a decrease in the consumption rate of carriers and resulting in a lower hydrogen production rate, and the results in Figure 5c confirm this conclusion. Figure 5c shows the cyclic stability test of STC-5% composite photocatalyst.…”

Section: Photoelectrochemical Properties Of the Stcsupporting

confidence: 63%

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Oxygen Vacancies‐Induced Dendritic SrTiO₃/CdS p–n Heterostructures Photocatalyst for Ultrahigh Hydrogen Evolution

Yu,

Li,

Duan

et al. 2023

Solar RRL

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Generally, hydrogen is regarded as one of the cleanest green energy sources, which can replace fossil fuels in the future due to its efficient energy release and zero-emission characteristics. [1] Photocatalytic water splitting is a promising method of hydrogen energy production. [2] As one of the most important solar technologies, semiconductor photocatalytic hydrogen production has attracted the attention of many researchers because of its environmental friendliness, stability, and economy. [3] Photosynthesis of natural plants can convert solar energy into other biological energy. The large specific surface area of the branches facilitates adequate photosynthesis, while it also requires the outside world to provide the necessary raw materials, such as dewdrops that can provide water for plants. However, there are still many challenges in the actual photocatalytic process. For example, the faster-photogenerated electron and hole complexation rates reduce the efficiency of photocatalysis, which in turn limits the practical applications of photocatalysis. [4,5] For this reason, numerous modification strategies including metal or nonmetal doping, [6,7] loading cocatalysts, [8] and construction of heterostructures [9,10] have been explored to improve photocatalytic efficiency, but there is still a huge potential for the development of lowering the carrier complexation rate in photocatalysis. Therefore, it is necessary to develop new methods to improve photocatalytic performance.SrTiO 3 is a perovskite oxide, which has a suitable band structure, high stability, superb electronic and optical performance, low toxicity, and inexpensive. [11,12] However, the broadband gap (%3.2 eV) of SrTiO 3 allows to make it merely absorb UV light, and the fast recombination of photo-generated charges carriers leads to a low usage rate of solar energy. [13] Oxygen vacancies can avoid the rapid recombination of photogenerated carriers and provide trapping sites at the same time. [14] Noticeably, oxygen vacancies can not only build a surface energy state but also expand the light absorbance to lower energy wavelengths. [15] Zhou [16] et al. found that hydrogen-treated SrTiO 3 can produce H 2 under UV light in absence of cocatalyst, due to the formation of appropriate oxygen vacancies by synergistic interaction of hydroxylation. Tan [17] et al. prepared surface oxygen vacancies on SrTiO 3 by the reaction with NaBH 4 . However, the practical application of SrTiO 3 has been greatly limited due to the low amount of hydrogen production. As a result of, it is of great meaning to explore a simple method to improve the photocatalytic hydrogen performance of SrTiO 3 .As a member of the metal sulfide family, CdS has a suitable bandgap (E g = 2.3 eV) with strong visible light absorption. [18][19][20] The inherent defects of CdS limit its practical application, such as easy photocorrosion and the high recombination rate

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Section: Characterization Of Stc Heterojunctionsupporting

confidence: 89%

Section: Photoelectrochemical Properties Of the Stcsupporting

confidence: 63%

Oxygen Vacancies‐Induced Dendritic SrTiO₃/CdS p–n Heterostructures Photocatalyst for Ultrahigh Hydrogen Evolution

Yu,

Li,

Duan

et al. 2023

Solar RRL

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“…27,34,35 Post-annealing treatments in argon for 2 h at different temperatures were performed on the SrTiO 3 :0.06Pr 3+ samples. 27,34,35 Post-annealing treatments in argon for 2 h at different temperatures were performed on the SrTiO 3 :0.06Pr 3+ samples.…”

Section: Resultsmentioning

confidence: 99%

“…4) with a calculated correlated color Annealing treatment has been widely conrmed as another effective means to enhance and/or modify emission properties of rare-earth ions-doped oxides, which may affect various aspects of the products, such as the crystallinity, crystal eld and oxygen vacancies. 27,34,35 Post-annealing treatments in argon for 2 h at different temperatures were performed on the SrTiO 3 :0.06Pr 3+ samples. The annealed samples present the similar morphology to that of the as-grown sample as shown by the SEM image in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The simultaneous enhancement of both the blue and the red emission of the SrTiO 3 :0.06Pr 3+ annealed in argon at 1350 C can be understood by considering the signicantly modied crystallinity and crystal eld of the SrTiO 3 :Pr 3+ sample because the high annealing temperature of 1350 C is closed to the widely employed sintering temperature of SrTiO 3 :Pr 3+ . [34][35][36][37]…”

Section: Resultsmentioning

confidence: 99%

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White-light-emitting properties of SrTiO₃:Pr³⁺ nanoparticles

Tang

Sun

et al. 2015

RSC Adv.

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Single-phase SrTiO 3 :mPr 3+ (m ¼ 0.01-0.1) nanoparticles have been synthesized by a hydrothermal method.Different from reported Pr 3+ -based phosphors which were all dominated by red emissions, considerably strong and overwhelming blue-green emission centered at 491 nm has been achieved together with minor green and red emissions. The absolute and relative intensities of these emissions can be modified by Pr 3+ concentrations and annealing temperatures in a controlled manner, giving rise to varied emission colors. In particular, owing to the appropriate combination of the blue to red emissions, desirable whitelight emission has been realized from the as-grown SrTiO 3 :0.01Pr 3+ and the annealed SrTiO 3 :0.06Pr 3+ samples at 350 C with CIE chromaticity coordinates of (0.33, 0.35) and (0.35, 0.37) and a correlated color temperature of 5601 K and 4883 K, respectively, indicating the promising application potential of SrTiO 3 :Pr 3+ as single-phase phosphors for white light-emitting-diodes. This work may provide a fresh route to acquire white emission from a single-composition phosphor. † Electronic supplementary information (ESI) available: Structural parameters of SrTiO 3 :mPr 3+ at room temperature rened with Pm3m space group, size distribution of the SrTiO 3 :0.06Pr 3+ nanoparticles, PLE spectra of the as-grown SrTiO 3 :0.06Pr 3+ monitored at 603 nm 617 nm and 650 nm, PL of the as-grown SrTiO 3 :0.06Pr 3+ sample under 447 nm excitation, SEM image of 1350 C annealed SrTiO 3 :0.06Pr 3+ nanoparticles, PLE spectra of as-grown and annealed SrTiO 3 :0.06Pr 3+ samples monitored at 491 nm, PLE spectra of as-grown and annealed SrTiO 3 :0.06Pr 3+ samples monitored at 617 nm, PL of the 1350 C annealed SrTiO 3 :0.06Pr 3+ sample under 490 nm excitation, CIE chromaticity diagram and chromaticity coordinates (x, y) of emission from SrTiO 3 :0.06Pr 3+ annealed at 1350 C (under 490 nm excitation), XRD patterns of as-grown and annealed SrTiO 3 :0.06Pr 3+ samples, structural parameters of as-grown and annealed SrTiO 3 :0.06Pr 3+ rened with Pm3m space group, and the energy level diagram of Pr 3+ ions. See

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New modified sol–gel method for preparation SrTiO3 nanostructures and their application in dye-sensitized solar cells

Gholamrezaei

Niasari

Dadkhah

et al. 2015

J Mater Sci: Mater Electron

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Large enhancement of photoluminescence in SrTiO3:Pr3+ powders by fluorhydric acid treatment

Cited by 6 publications

References 25 publications

Oxygen Vacancies‐Induced Dendritic SrTiO₃/CdS p–n Heterostructures Photocatalyst for Ultrahigh Hydrogen Evolution

Oxygen Vacancies‐Induced Dendritic SrTiO₃/CdS p–n Heterostructures Photocatalyst for Ultrahigh Hydrogen Evolution

White-light-emitting properties of SrTiO₃:Pr³⁺ nanoparticles

New modified sol–gel method for preparation SrTiO3 nanostructures and their application in dye-sensitized solar cells

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Large enhancement of photoluminescence in SrTiO3:Pr3+ powders by fluorhydric acid treatment

Cited by 6 publications

References 25 publications

Oxygen Vacancies‐Induced Dendritic SrTiO3/CdS p–n Heterostructures Photocatalyst for Ultrahigh Hydrogen Evolution

Oxygen Vacancies‐Induced Dendritic SrTiO3/CdS p–n Heterostructures Photocatalyst for Ultrahigh Hydrogen Evolution

White-light-emitting properties of SrTiO3:Pr3+ nanoparticles

New modified sol–gel method for preparation SrTiO3 nanostructures and their application in dye-sensitized solar cells

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Product

Resources

About

Oxygen Vacancies‐Induced Dendritic SrTiO₃/CdS p–n Heterostructures Photocatalyst for Ultrahigh Hydrogen Evolution

Oxygen Vacancies‐Induced Dendritic SrTiO₃/CdS p–n Heterostructures Photocatalyst for Ultrahigh Hydrogen Evolution

White-light-emitting properties of SrTiO₃:Pr³⁺ nanoparticles