Enhanced three-photon near-infrared quantum splitting in <i>β-</i>NaYF4:Ho3+ by codoping Yb3+

Yu, Dechao; Ye, Shi; Huang, Xiaoyong; Zhang, Q. Y.

doi:10.1063/1.4718412

Cited by 24 publications

(22 citation statements)

References 24 publications

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“…The first, relatively weak emission line corresponds to a 5 F 5 to 5 I 8 transition (e.g., Friis et al, 2010;Qin et al, 2011;Pandey and Swart, 2016), while the second, more intense emission cluster results from a 5 F 4 / 5 S 2 to 5 I 7 transition (e.g., Qin et al, 2011;Pandey and Swart, 2016). The third and most prominent emission cluster in the near-infrared wavelength range resembles observations by Yu et al (2012), who detect a transition from 5 F 5 to 5 I 7 with emission lines at 965 nm. A combination with transition processes assigned to 14 https://doi.org/10.5194/essd-2020-296…”

Section: Ree Reference Spectra At 532 Nm Laser Excitationsupporting

confidence: 74%

“…Open Access a 5 F 4 / 5 S 2 to 5 I 6 with typical emission features at longer wavelengths conjecturally explain the observed broad, intense emission cluster at 982 nm. An influence from Yb 3+ as intensifier of this spectral response (Yu et al, 2012) can be excluded by NAA results below detection limit (Donovan et al, 2002).…”

Section: Ree Reference Spectra At 532 Nm Laser Excitationmentioning

confidence: 99%

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A spectral library for laser-induced fluorescence analysis as a tool for rare earth element identification

Fuchs¹,

Beyer²,

Lorenz³

et al. 2020

Preprint

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Abstract. With the recurring interest on rare-earth elements (REE), laser-induced fluorescence (LiF) may provide a powerful tool for their rapid and accurate identification at different stages along their value chain. Applications to natural materials such as rocks could complement the spectroscopy-based toolkit for innovative, non-invasive exploration technologies. However, the diagnostic assignment of detected emission lines to individual REE remains challenging, because of the complex composition of natural rocks in which they can be found. The resulting mixed spectra and the large amount of data generated demand for automated approaches of data evaluation, especially in mapping applications such as drill core scanning. LiF reference data provide the solution for robust REE identification, yet they usually remain in the form of tables of published emission lines. We show that a complete reference spectra library could open manifold options for innovative automated analysis. We present a library of high-resolution LiF reference spectra using the Smithsonian rare-earth phosphate standards for electron microprobe analysis.We employ three standard laser wavelengths (325 nm, 442 nm, 532 nm) to record representative spectra in the UV-visible to near-infrared spectral range (340–1080 nm). Excitation at all three laser wavelengths yielded characteristic spectra with distinct REE-related emission lines for EuPO4, TbPO4, DyPO4 and YbPO4. In the other samples, the high-energy excitation at 325 nm caused unspecific, broadband defect emissions. Here, lower energy laser excitation showed successful for suppressing non-REE-related emission. At 442 nm excitation, REE-reference spectra depict the diagnostic emission lines of PrPO4, SmPO4 and ErPO4. For NdPO4 and HoPO4 most efficient excitation was achieved with 532 nm. Our results emphasise on the possibility of selective REE excitation by changing the excitation wavelength according to the suitable conditions for individual REEs. Our reference spectra provide a database for transparent and reproducible evaluation of REE-bearing rocks. The LiF spectral library is available at https://zenodo.org/ and the registered DOI: http://doi.org/10.5281/zenodo.4054606 (Fuchs et al., 2020). It gives access to traceable data for manifold further studies on comparison of emission line positions, emission line intensity ratios and splitting into emission line sub-levels or can be used as reference or training data for automated approaches of component assignment.

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Section: Ree Reference Spectra At 532 Nm Laser Excitationsupporting

confidence: 74%

Section: Ree Reference Spectra At 532 Nm Laser Excitationmentioning

confidence: 99%

A spectral library for laser-induced fluorescence analysis as a tool for rare earth element identification

Fuchs¹,

Beyer²,

Lorenz³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Recently, visible-to-near-infrared (NIR) downconversion has been extensively investigated in RE 3+ /Yb 3+ (RE = Tb, Tm, Pr, Er, Nd, and Ho) codoped materials for the potential application of efficiency enhancement for Si solar cells [5,6,[11][12][13][14][15][16][17][18]. The energy of a blue/UV photon absorbed by a RE 3+ donor ion is transferred to two nearby Yb 3+ acceptor ions, efficiently emitting two NIR photons around 1000 nm just above the E g of Si.…”

Section: Introductionmentioning

confidence: 99%

Insights into the energy transfer mechanism inCe3+−Yb3+codoped YAG phosphors

Rabouw

Boon

et al. 2014

Phys. Rev. B

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Two distinct energy transfer (ET) mechanisms have been proposed for the conversion of blue to near-infrared (NIR) photons in YAG:Ce 3+ ,Yb 3+ . The first mechanism involves downconversion by cooperative energy transfer, which would yield two NIR photons for each blue photon excitation. The second mechanism of single-step energy transfer yields only a single NIR photon for each blue photon excitation and has been argued to proceed via a Ce 4+ -Yb 2+ charge transfer state (CTS). If the first mechanism were operative in YAG:Ce 3+ ,Yb 3+ , this material would have the potential to greatly increase the response of crystalline Si solar cells to the blue/UV part of the solar spectrum. In this work, however, we demonstrate that blue-to-NIR conversion in YAG:Ce 3+ ,Yb 3+ goes via the single-step mechanism of ET via a Ce 4+ -Yb 2+ CTS. The photoluminescence decay dynamics of the Ce 3+ excited state are inconsistent with Monte Carlo simulations of the cooperative (one-to-two photon) energy transfer, while they are well reproduced by simulations of single-step (one-to-one photon) energy transfer via a charge transfer state. Based on temperature dependent measurements of energy transfer and luminescence quenching we construct a configuration coordinate model for the Ce 3+ -to-Yb 3+ energy transfer, which includes the Ce 4+ -Yb 2+ charge transfer state.

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“…A large number of downconversion materials able to convert high-energy photons into multiple lower-energy photons have recently been developed [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] . The downconversion process occurs by energy transfer between luminescent centers, either lanthanide ions with a wide range of energy levels or organic molecules with low-energy triplet states 31,32 .…”

Section: Introductionmentioning

confidence: 99%

Multi-photon quantum cutting in Gd2O2S:Tm3+ to enhance the photo-response of solar cells

Martín-Rodríguez

Zhang

et al. 2015

Light Sci Appl

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Conventional photoluminescence (PL) yields at most one emitted photon for each absorption event. Downconversion (or quantum cutting) materials can yield more than one photon by virtue of energy transfer processes between luminescent centers. In this work, we introduce Gd 2 O 2 S:Tm 31 as a multi-photon quantum cutter. It can convert near-infrared, visible, or ultraviolet photons into two, three, or four infrared photons of ,1800 nm, respectively. The cross-relaxation steps between Tm 31 ions that lead to quantum cutting are identified from (time-resolved) PL as a function of the Tm 31 concentration in the crystal. A model is presented that reproduces the way in which the Tm 31 concentration affects both the relative intensities of the various emission lines and the excited state dynamics and providing insight in the quantum cutting efficiency. Finally, we discuss the potential application of Gd 2 O 2 S:Tm 31 for spectral conversion to improve the efficiency of next-generation photovoltaics. Keywords: downconversion; infrared emission; quantum cutting; solar cells; spectral conversions INTRODUCTION Over the last decade, advanced luminescent materials exhibiting downconversion, also known as quantum cutting or quantum splitting, have been developed 1,2 . In this process, a high-energy photon is converted into two or more lower-energy photons, with a quantum efficiency of potentially well over 100% 3 . If the downconverted photons are in the visible range, this concept is of interest for color conversion layers in conventional lighting applications 1,2,4-6 . New exciting possibilities of downconversion to infrared (IR) photons lie in next-generation photovoltaics, aiming at minimizing the spectral mismatch losses in solar cells [7][8][9][10][11] .Spectral mismatch is the result of the broad width of the spectrum emitted by the sun. Semiconductor absorber materials absorb only photons with an energy hn higher than the band gap E g 7 . To absorb many photons and produce a large electrical current, absorber materials must therefore have a small bandgap. However, because excited charge carriers rapidly thermalize to the edges of a semiconductor's conduction and valence bands, a high voltage output requires an absorber with a large band gap. Hence, materials with low transmission losses (leading to a large current) have high thermalization losses (leading to a low voltage) and vice versa 12,13 . These spectral mismatch losses constitute the major factor defining the relatively low ShockleyQueisser limit 14 , the maximum light-to-electricity conversion efficiency of 33% in a single-junction solar cell, obtained for a band gap of approximately 1.1 eV (1100 nm) 13 .Efficiencies higher than 33% can be reached with multi-junction solar cells, where a stack of multiple absorber materials are each optimized to efficiently convert different parts of the solar spectrum to

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Enhanced three-photon near-infrared quantum splitting in β-NaYF4:Ho3+ by codoping Yb3+

Cited by 24 publications

References 24 publications

A spectral library for laser-induced fluorescence analysis as a tool for rare earth element identification

A spectral library for laser-induced fluorescence analysis as a tool for rare earth element identification

Insights into the energy transfer mechanism inCe3+−Yb3+codoped YAG phosphors

Multi-photon quantum cutting in Gd2O2S:Tm3+ to enhance the photo-response of solar cells

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