A sequential two-step near-infrared quantum splitting in Ho3+ singly doped NaYF4

Yu, Dechao; Huang, Xiaoyong; Ye, S.; Zhang, Q. Y.; Wang, Jing

doi:10.1063/1.3666981

Cited by 22 publications

(20 citation statements)

References 24 publications

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“…21 [20][21][22] The crystal structure and phase identification of the obtained products were characterized by means of a Philips Model PW1830 powder X-ray diffractometer (XRD) using graphite monochromator and Cu Kα radiation (λ = 1.5405 Å) at 40 kV and 40 mA. Steady luminescence spectra were recorded on an Edinburgh FLS920 spectrofluorometer with a continuous 450 W xenon lamp as the excitation resource and by single photon counting.…”

Section: Introductionmentioning

confidence: 99%

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

Huang

et al. 2012

AIP Advances

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An efficient three-step sequential three-photon near-infrared (NIR) quantum splitting (QS), involving the emission of three NIR photons from an absorbed ultraviolet (UV) photon in β-NaYF4:Ho3+, has been demonstrated. Codoping Yb3+ can increase the NIR emissions significantly through the first- and second-step cross-relaxation. The involved mechanisms of three-step NIR QS in Ho3+-Yb3+ have been well demonstrated by the static and dynamic photoluminescence, monitored excitation and time-resolved fluorescence spectra. An internal quantum yield (QY) of 246% for the Yb3+ codoped β-NaYF4:Ho3+ is estimated on the basis of experimental data and theoretical considerations, which is much more than the total QY of 124% for the β-NaYF4:Ho3+ three-photon NIR QS. This research may open up promising new perspectives for designing efficient photonic devices.

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Section: Introductionmentioning

confidence: 99%

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

Huang

et al. 2012

AIP Advances

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“…After a 360 Gy X-ray dose, intense emissions between 1300 nm and 1500 nm were observed that were over 20 times more intense than the Dy 3+ emissions. Emissions with similar line structure occurring between 1100 nm and 1200 nm have been observed in NaYF 4 :Ho [156] and YAG:Ho [157], where they were attributed to the 5 I 6 → 5 I 8 transition of Ho 3+ . As Ho 3+ and Dy 2+ have the same 4f 10 configuration (and consequently the same 2S+1 L J states), a similar emission would be expected for the Dy 2+ ion.…”

Section: Namgf 3 :Dysupporting

confidence: 60%

“…It should be noted that the numerous energy levels within the 4f 9 configuration of Dy 3+ allow for multiple radiative transitions from a single excitation. This phenomenon is commonly referred to as downconversion, or quantum cutting, and has found applications in solar cell sensitisation [156]. In the NaMgF 3 :Dy system several multi-photon emission pathways are available.…”

Section: Namgf 3 :Dymentioning

confidence: 99%

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The Effect of Ionising Radiation on the Luminescence Properties of Fluoroperovskites

Schuyt¹

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<p>The luminescence of crystalline compounds can be used to monitor many physical phenomena, including doses of ionising radiation. Optically stimulated luminescence (OSL), thermoluminescence (TL), and radiophotoluminescence (RPL) have been successfully employed in dosimetry. However, few materials possess both the structural and luminescence properties required for medical dosimetry. This thesis aimed to investigate the luminescence features of the class of compounds known as fluoroperovskites. Emphasis was placed on studying the effects of irradiation on the luminescence properties, such that the compounds could be evaluated regarding potential applications in clinical dosimetry. Samples were primarily characterised using photoluminescence (PL), radioluminescence (RL), OSL, RPL, TL, and transmittance spectroscopy. OSL was observed in the majority of samples due to the existence of electron trapping F-type centres. F-centre/Mn complexes were observed in all AMgF3:Mn compounds after irradiation and the energy levels of the complexes in each compound were experimentally determined. The most promising potential dosimeter host material was the near tissue-equivalent NaMgF3. When doped with Mn2+, the compound exhibited RPL via the formation of F-centre/Mn complexes and OSL via several trapping centres. The RPL could be probed independently to the OSL such that the compound could function as a hybrid OSL/RPL dosimeter. In the NaMgF3:Ln compounds, RPL occurred via the radiation-induced reduction Ln3+ → Ln2+ for Ln = Sm, Dy, and Yb. The reduction Sm3+ → Sm2+ was highly stable and could be non-destructively probed independently to the OSL. The Sm doped compound also exhibited radiation-induced conductivity that could be coupled with the RL, such that the compound could function as a real-time hybrid optical/electrical dosimeter. Charge kinetics, thermal quenching, and binding energy models were developed and applied to the compounds. Finally, a two-dimensional readout system was designed and constructed. The capabilities of the system were evaluated using the OSL of NaMgF3:Eu and NaMgF3:Mn. Sensitivities to doses from < 10 mGy to > 1 Gy were obtained along with sub-millimetre spatial resolutions.</p>

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“…The process of NIR quantum cutting is involved in , respectively [9][10][11][12][13][14]. The emission of NIR photons may get the setback from the unwanted emissions in the UV-visible region along with non-radiative recombination along with desired NIR emission.…”

Section: Near Ir (Nir) Quantum Cuttingmentioning

confidence: 99%

Modelling and Measurements of Normal and Lateral Stiffness for Atomic Force Microscopy

Choi¹

2014

Applied Science and Convergence Technology

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The global demand for energy has been increasing since past decades. Various technologies have been working to find a suitable alternative for the generation of sustainable energy.Photovoltaic technologies for solar energy conversion represent one of the significant routes for the green and renewable energy production. Despite of remarkable improvement in solar cell technologies, the generation of power is still suffering with lower energy conversion efficiency, high production cost, etc. The major problem in improving the PV efficiency is spectral mismatch between the incident solar spectrum and bandgap of a semiconductor material used in solar cell. Luminescent materials such as rare-earth doped phosphor materials having the quantum efficiency higher than unity can be helpful for photovoltaic applications.Quantum cutting phosphors are the most suitable candidates for the generation of two or more low-energy photons for the absorption of every incident high-energy photons. The phosphors which are capable of converting UV photon to visible and near-IR (NIR) photon are studied primarily for photovoltaic applications. In this review, we will survey various near IR quantum cutting phosphors with respective to their synthesis method, energy transfer mechanism, nature of activator, sensitizer and dopant materials incorporation and energy conversion efficiency considering their applications in photovoltaics.

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A sequential two-step near-infrared quantum splitting in Ho3+ singly doped NaYF4

Cited by 22 publications

References 24 publications

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

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

The Effect of Ionising Radiation on the Luminescence Properties of Fluoroperovskites

Modelling and Measurements of Normal and Lateral Stiffness for Atomic Force Microscopy

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