Combinatorial screening of Eu3+ doped TiO2–Y2O3–Gd2O3 ternary system at soft UV excitation

Park, Duk Hyun; Cho, Sang-Ho; Kim, Ji Sik; Sohn, Kee‐Sun

doi:10.1016/j.jallcom.2006.01.140

Cited by 13 publications

(8 citation statements)

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“…14) Several papers have also reported that the direct excitation into Eu 3þ with light of wavelength longer than 360 nm gives rise to the broad band spectrum. 3,5,13,16,20,25) In this study, we found that different broad band features are observed depending on excitation wavelength within the same Eu 3þ absorption band region. Figure 8 shows the temperature dependence of PL spectra for Eu900 excited at 330 nm.…”

Section: Pl Spectra At Room Temperaturementioning

confidence: 49%

“…1 were taken from papers by Falcomer et al 13) and Ikeda et al, 14) respectively. A spectrum quite similar to Spectrum (1) (called broad band spectrum, hereafter) is found in many reports, 1,3,5,[10][11][12][16][17][18][19][20][21][22][23][24]27) while a spectrum similar to Spectrum (2) (called sharp line spectrum, hereafter) has been observed by Li et al 6) The broad band spectrum has its most intense band at 613 nm, while the sharp line spectrum has its at 618 nm. The difference between the sharp line spectrum and the broad band spectrum is not only in the band width but also in many features.…”

Section: Introductionmentioning

confidence: 63%

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Spectroscopy Study on the Location and Distribution of Eu³⁺ Ions in TiO₂ Nanoparticles

Tsuboi

Setiawati

Kawano

2008

jjap

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Eu 3þ -and non-doped TiO 2 nanoparticles were synthesized by the sol-gel method at sintering temperatures of 500 or 900 C. The photoluminescence spectra of these nanoparticles have been investigated at various temperatures between 290 and 12 K. Two kinds of Eu 3þ photoluminescence spectra were observed. One spectrum consists of sharp lines; the other consists of broad bands. The former was obtained by indirect excitation into Eu 3þ with light of wavelengths shorter than 330 nm, while the latter was obtained by direct excitation into Eu 3þ with light of wavelengths longer than 380 nm which correspond to the Eu 3þ absorption bands. In the latter case, different spectra were obtained depending on the excitation wavelength even in the same absorption band. It is suggested that the sharp line spectrum is caused by Eu 3þ ions substituted for Ti 4þ but with some distortion around the Eu 3þ ions in the matrix of TiO 2 due to the large difference in ionic radius between the Ti 4þ and Eu 3þ ions, which are mainly present in the interior region of the nanoparticle. The broad band spectrum is caused by the disordered Eu 3þ ions with Eu-O-Ti bonds which are predominantly present in the near surface region.

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Section: Pl Spectra At Room Temperaturementioning

confidence: 49%

Section: Introductionmentioning

confidence: 63%

Spectroscopy Study on the Location and Distribution of Eu³⁺ Ions in TiO₂ Nanoparticles

Tsuboi

Setiawati

Kawano

2008

jjap

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“…The typical intra-4f transition direct excitation peak at around 396 nm in the excitation spectrum of TiO 2 :Eu 3+ is due to the 7 F 0 − 5 L J transition of Eu 3+ . 31 Also, the weaker peak at around 415 nm overlaps with the emission bands of TiO 2 , revealing that TiO 2 could induce luminescence of Eu 3+ ions. Moreover, a little shoulder peak at around 384 nm corresponding to the energy gap of TiO 2 (3.22 eV) is observed in the excitation spectrum (Figure 5b,c).…”

Section: Acs Applied Energy Materialsmentioning

confidence: 95%

High-Performance Perovskite Solar Cells with a Weak Covalent TiO₂:Eu³⁺ Mesoporous Structure

Jiang

Zheng

Chen

et al. 2017

ACS Appl. Energy Mater.

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Mesoporous TiO2 nanocrystals with attached Eu3+ ions in an amorphous state are employed as structures for highly efficient perovskite solar cells. The down-conversion TiO2:Eu3+ nanocrystal shows a good photoluminescence characteristic to convert the incident high-energy photon into a lower-energy photon, which improves the UV light utilization capability of perovskite solar cells (PSCs). The device within 1.0 wt % Eu3+ ions shows an improvement of 29.2% from 12.22% to 15.79% in PCE compared with the typical devices without Eu3+ in TiO2, which is attributed to the increased utilization of incident UV light and the dramatically suppressed electron recombination process. To summarize, the combination of a high UV light-harvesting capability and a slow electron recombination process with TiO2:Eu3+ mesoporous structure could successfully develop more efficient and stable PSCs.

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“…If j , k Ͼ n, then j = j − n and k = k − n. For example, p 5 ͑x͒ = x 1 + 2x 2 + 3x 3 + 4x 4 + 5x 5 + 2x 1 x 2 + 6x 2 x 3 + 12x 3 x 4 + 20x 4 x 5 + 5x 5 x 1 + 6x 1 x 2 x 3 + 24x 2 x 3 x 4 + 60x 3 x 4 x 5 + 20x 4 x 5 x 1 + 10x 5 x 1 x 2 . If j , k Ͼ n, then j = j − n and k = k − n. For example, p 5 ͑x͒ = x 1 + 2x 2 + 3x 3 + 4x 4 + 5x 5 + 2x 1 x 2 + 6x 2 x 3 + 12x 3 x 4 + 20x 4 x 5 + 5x 5 x 1 + 6x 1 x 2 x 3 + 24x 2 x 3 x 4 + 60x 3 x 4 x 5 + 20x 4 x 5 x 1 + 10x 5 x 1 x 2 .…”

Section: A Model Systemsmentioning

confidence: 99%

An efficient algorithm to accelerate the discovery of complex material formulations

Brell

Rabitz

2010

The Journal of Chemical Physics

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The identification of complex multicomponent material formulations that possess specific optimal properties is a challenging task in materials discovery. The high dimensional composition space needs to be adequately sampled and the properties measured with the goal of efficiently identifying effective formulations. This task must also take into account mass fraction and possibly other constraints placed on the material components. Either combinatorial or noncombinatorial sampling of the composition space may be employed in practice. This paper introduces random sampling-high dimensional model representation (RS-HDMR) as an algorithmic tool to facilitate these nonlinear multivariate problems. RS-HDMR serves as a means to accurately interpolate over sampled materials, and simulations of the technique show that it can be very efficient. A variety of simulations is carried out modeling multicomponent-->property relationships, and the results show that the number of sampled materials to attain a given level of accuracy for a predicted property does not significantly depend on the number of components in the formulation. Although RS-HDMR best operates in the laboratory by guided iterative rounds of random sampling of the composition space along with property observation, the technique was tested successfully on two existing databases of a seven component phosphor material and a four component deNO(x) catalyst for reduction of NO with C(3)H(6).

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Combinatorial screening of Eu3+ doped TiO2–Y2O3–Gd2O3 ternary system at soft UV excitation

Cited by 13 publications

References 24 publications

Spectroscopy Study on the Location and Distribution of Eu³⁺ Ions in TiO₂ Nanoparticles

Spectroscopy Study on the Location and Distribution of Eu³⁺ Ions in TiO₂ Nanoparticles

High-Performance Perovskite Solar Cells with a Weak Covalent TiO₂:Eu³⁺ Mesoporous Structure

An efficient algorithm to accelerate the discovery of complex material formulations

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Combinatorial screening of Eu3+ doped TiO2–Y2O3–Gd2O3 ternary system at soft UV excitation

Cited by 13 publications

References 24 publications

Spectroscopy Study on the Location and Distribution of Eu3+ Ions in TiO2 Nanoparticles

Spectroscopy Study on the Location and Distribution of Eu3+ Ions in TiO2 Nanoparticles

High-Performance Perovskite Solar Cells with a Weak Covalent TiO2:Eu3+ Mesoporous Structure

An efficient algorithm to accelerate the discovery of complex material formulations

Contact Info

Product

Resources

About

Spectroscopy Study on the Location and Distribution of Eu³⁺ Ions in TiO₂ Nanoparticles

Spectroscopy Study on the Location and Distribution of Eu³⁺ Ions in TiO₂ Nanoparticles

High-Performance Perovskite Solar Cells with a Weak Covalent TiO₂:Eu³⁺ Mesoporous Structure