An up-conversion luminophore with high quantum yield and brightness based on BaF2:Yb3+,Er3+ single crystals

The influence of erbium ion concentration on the optical properties of BaF2:ErF3 crystals was investigated. Four ErF3 concentration (0.05, 0.08, 0.15 and 0.5 mol% ErF3)-doped BaF2 crystals were obtained using the Bridgman technique. Room temperature optical absorption in the 250–850 nm spectral range was measured, and the photoluminescence (PL) and decay times were also investigated. The Judd–Ofelt (JO) approximation was used, taking into account four absorption peaks (at 377, 519, 653 and 802 nm). The JO intensity parameters, Ωt (t = 2, 4, 6), were calculated. The influence of the ErF3 concentration on the JO parameters, branching ratio, radiative transition probability and radiative lifetime were studied. The obtained results were compared with measured values and with those reported in the literature. Under excitation at 380 nm, the well-known green (539 nm) and red (668 nm) emissions were obtained. The calculated and experimental radiative lifetimes were in millisecond range for green and red emissions. The intensity of the PL spectra varied with the Er3+ ion concentration. The emission intensity increased linearly or exponentially, depending on the ErF3 concentration. Under excitation at 290 nm, separate to the green and red emissions, a new UV emission band (at 321 nm) was obtained. Other research has not reported the UV emission or the influence of ErF3 concentration on emission behavior.

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“…The mean decay times, τ mean , for 4 S 3/2 , 4 F 9/2 manifolds were calculated using Equation [ 24 ]:

where τ 1 and τ 2 are the radiative decays of the non-mono exponential fitting curve.…”

Section: Resultsmentioning

confidence: 99%

“…The decay curves of the 2 P3/2 → 4 I15/2 transition (UV emission, 321 nm) by excitation at 295 nm for two ErF3 concentrations (0.05 and 0.5 mol%) are shown in Figure 8c. The mean decay times, τmean, for 4 S3/2, 4 F9/2 manifolds were calculated using Equation [24]:…”

Section: Photoluminescence and Pl Kineticsmentioning

confidence: 99%

Luminescence Properties and Judd–Ofelt Analysis of Various ErF3 Concentration-Doped BaF2 Crystals

et al. 2021

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“…The low-energy phonons (a few tens of cm −1 ) available in ionic oxides and fluorides are poorly efficient for inducing non-radiative relaxation between the spectroscopic levels of lanthanide cations (separated by several hundreds/thousands of cm −1 ), 9 a – c which makes these ionic solids ideal hosts for welcoming Ln 3+ as dopants with the ultimate goal of inducing efficient (linear) upconversion processes in the solid state (maximum reported quantum yields about ϕ up tot = 9–12%). 14 The recurrent need for miniaturizing within the frame of biological applications resulted in an intense scientific activity, which aimed at transforming Ln-doped upconverting ionic solids into nanoparticles. 9 d – h The unfavorable quenching due to the increase of the surface/volume ratio in the latter entities 15 can be partially compensated (i) by coupling with plasmonic surfaces 9 f , k and/or (ii) by statistically introducing some efficient light-sensitizers 16 compatible with the operation of the more efficient energy transfer upconversion (ETU) mechanism ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Molecular light-upconversion: we have had a problem! When excited state absorption (ESA) overcomes energy transfer upconversion (ETU) in Cr(iii)/Er(iii) complexes

et al. 2021

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“…Strontium fluoride is usually used as a matrix, which provides a high quantum yield of upconversion [20,21]. At present, the maximum quantum yields reported for upconversion luminophores in the solid state are about 9-12% [22,23]. Despite the fact that the idea of creating photoconversion films appeared more than thirty years ago [24], upconversion luminophores do not apply to the preparation of photoconversion coatings for the transparent shells of greenhouses due to small spectral changes.…”

Section: Introductionmentioning

confidence: 99%

Cultivation of Solanum lycopersicum under Glass Coated with Nanosized Upconversion Luminophore

et al. 2021

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The effect of upconverting luminescent nanoparticles coated on glass on the productivity of Solanum lycopersicum was studied. The cultivation of tomatoes under photoconversion glass led to an increase in plant productivity and an acceleration of plant adaptation to ultraviolet radiation. An increase in the total leaf area and chlorophyll content in the leaves was revealed in plants growing under the photoconversion glass. Plants growing under the photoconversion glass were able to more effectively utilize the absorbed light energy. The results of this study suggest that the spectral changes induced by photoconversion glass can accelerate the adaptation of plants to the appearance of ultraviolet radiation.

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An up-conversion luminophore with high quantum yield and brightness based on BaF₂:Yb³⁺,Er³⁺ single crystals

Abstract: Up-conversion (UC) of near-infrared radiation to visible light has received much attention because of its use in conversion of solar radiation, luminescence thermometry, biosensing, and anti-counterfeiting applications. However, the main...

Cited by 46 publications

References 84 publications

Luminescence Properties and Judd–Ofelt Analysis of Various ErF3 Concentration-Doped BaF2 Crystals

Luminescence Properties and Judd–Ofelt Analysis of Various ErF3 Concentration-Doped BaF2 Crystals

Molecular light-upconversion: we have had a problem! When excited state absorption (ESA) overcomes energy transfer upconversion (ETU) in Cr(iii)/Er(iii) complexes

Cultivation of Solanum lycopersicum under Glass Coated with Nanosized Upconversion Luminophore

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