Up- and down-conversion emissions from Er3+ doped K2YF5 and K2YbF5 crystals

Loiko, Pavel; Хайдуков, Н.М.; Méndez‐Ramos, J.; Vilejshikova, Elena; Скопцов, Н. А.; Yumashev, K. V.

doi:10.1016/j.jlumin.2015.10.016

Cited by 34 publications

(8 citation statements)

References 36 publications

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“…Notably, this behavior occurs under diffuse illumination conditions relevant to the terrestrial solar spectrum (∼100 mW cm −2 total), a stark contrast to the high excitation powers generally required for Ln luminescence. Furthermore, the excitation powers used here are far below the regimes for power saturation that are generally observed in these and related materials (Suyver et al, 2005;Chen G, et al, 2009;Lin et al, 2015;Loiko et al, 2016;Chen et al, 2017), demonstrating that our reported power dependencies are not mere artifacts of excited state saturation.…”

Section: Downconversion Order Via Power Dependencesupporting

confidence: 49%

“…The observed sub-unity slopes are diagnostic of a multi-photon production process involving direct transitions from the 4 G 9/2 donor level in Nd 3+ to the 2 F 5/2 level in Yb 3+ . Generally, an idealized two-photon DC process yields a theoretical slope of n = 0.5, in contrast to the slope of 1 found in the power dependence for a typical, 1:1 Stokes-shifted emission and the n = 2 slope for two-photon UC (Suyver et al, 2005 ; Chen G, et al, 2009 ; Zou et al, 2012 ; Lin et al, 2015 ; Loiko et al, 2016 ; Chen et al, 2017 ). Here, the intermediate slope observed in the NIR luminescence suggests a photoemission that is a function of both 1:1 Stokes-shifted luminescence and 1:2 photon DC pathways.…”

Section: Resultsmentioning

confidence: 95%

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Infrared Photon Pair-Production in Ligand-Sensitized Lanthanide Nanocrystals

2020

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This report details spectroscopic characterizations of rare-earth, core-shell nanoparticles decorated with the f -element chelator 3,4,3-LI(1,2-HOPO). Evidence of photon downconversion is corroborated through detailed power dependence measurements, which suggest two-photon decay paths are active in these materials, albeit only representing a minority contribution of the sum luminescence, with emission being dominated by normal, Stokes' shifted fluorescence. Specifically, ultraviolet ligand photosensitization of Nd 3+ ions in a NaGdF 4 host shell results in energy transfer to a Nd 3+ /Yb 3+ -doped NaGdF 4 nanoparticle core. The population and subsequent decay of core, Yb 3+ 2 F 5/2 states result in a spectral shift of 620 nm, manifested in a NIR emission displaying luminescence profiles diagnostic of Yb 3+ and Nd 3+ excited state decays. Emphasis is placed on the generality of this material architecture for realizing ligand-pumped, multi-photon downconversion, with the Nd 3+ /Yb 3+ system presented here functioning as a working prototype for a design principle that may be readily extended to other lanthanide pairs.

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Section: Downconversion Order Via Power Dependencesupporting

confidence: 49%

Section: Resultsmentioning

confidence: 95%

Infrared Photon Pair-Production in Ligand-Sensitized Lanthanide Nanocrystals

2020

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“…[148] There are a few DC and UC compound have been reported, and showed relatively high energy transfer efficiency and could be applied for OSCs. [149][150][151] Similarly, materials having absorption in both UV and IR regions, with the corresponding emission in the visible range, could be synthesized and explored. From the application point of view, there are various areas where DC-based devices can perform outstandingly.…”

Section: Future Perspectivesmentioning

confidence: 99%

Down‐conversion materials for organic solar cells: Progress, challenges, and perspectives

et al. 2022

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Organic solar cells (OSCs) in terms of power conversion efficiency (PCE) and operational lifetime have made remarkable progress during the last decade by improving the active layer materials and introducing new interlayers. The newly developed wide bandgap organic donor and low bandgap acceptor molecules covered the absorption from the visible to the near-infrared region. Whereas the incident high energy region (UV) is not in favor of OSCs. Its absorption causes thermalization losses and photoinduced degradation, which hinders the PCE and lifetime of OSCs. Recently, lanthanide and non-lanthanide-based down-conversion (DC) materials have been introduced, which can effectively convert the high-energy photons (UV) to low-energy photons (visible) and resolve the spectral mismatch losses that limit the absorption of OSCs in high energy incident spectrum. Furthermore, the DC materials also protect the OSCs from UV-induced degradation. The DC materials were also proposed to cross the Shockley-Queisser efficiency limit of the solar cell. In this review, the need for DC materials and their processing method for OSCs have been thoroughly discussed. However, the main emphasis has been given to developing lanthanides and non-lanthanides-based DC materials for OSCs, their applications, and their impact on photovoltaic device performance, stability, and future perspectives.

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“…Several DC and UC compounds with good energy transfer efficiency have been identified for solar applications. [186][187][188] Similarly, materials with UV/IR absorption and visible emission may be researched and prepared to improve PSC efficiency. In terms of applicability, DC materials-based devices excel in fields where UV and near-blue visible light are not absorbed by photoactive layers.…”

Section: Current Challenges and Future Perspectivesmentioning

confidence: 99%

Downconversion Materials for Perovskite Solar Cells

et al. 2022

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Perovskite solar cells (PSCs) have made game‐changing progress in the last decade and reached a power conversion efficiency (PCE) of up to 25%. Furthermore, the development of material chemistry, structure design, active layer composition, process engineering, etc. has contributed to improving PSCs’ stability. The significant PCE losses experienced by PSCs are related to spectral mismatch between the incident solar spectra and absorption range of the active layer, which thereby limits the PCE. Besides PSCs’ performance, the photoinduced degradation is also a major concern. Recently, lanthanide (rare‐earth) and nonlanthanide‐based downconversion (DC) materials have been introduced to resolve these spectral mismatch losses as well as reduce the photoinduced degradation. The DC materials improve the photovoltaic performance by converting ultraviolet (UV) light to visible, also providing UV shielding, and thus contribute to increasing the efficiency as well as stability of PSCs. Moreover, the Shockley–Queisser efficiency limit of the solar cell can be crossed with the help of DC materials. In this review, the importance, processing, and the reported DC materials for PSCs are thoroughly discussed. Furthermore, the development of DC materials and their impact on PSCs’ performance and stability, along with their future perspectives, are focused.

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Up- and down-conversion emissions from Er3+ doped K2YF5 and K2YbF5 crystals

Cited by 34 publications

References 36 publications

Infrared Photon Pair-Production in Ligand-Sensitized Lanthanide Nanocrystals

Infrared Photon Pair-Production in Ligand-Sensitized Lanthanide Nanocrystals

Down‐conversion materials for organic solar cells: Progress, challenges, and perspectives

Downconversion Materials for Perovskite Solar Cells

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