Near-infrared luminescence and quantum cutting mechanism in CaWO4:Nd3+, Yb3+

Sun, Jiayue; Sun, Yining; Cao, Chun; Xia, Zhiguo; Du, Haiyan

doi:10.1007/s00340-013-5342-4

Cited by 32 publications

(25 citation statements)

References 28 publications

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“…It can be seen that the values |Q CT /Q CF | of relative importance of CT mechanism for ∆g and A (2) are much smaller than those for ∆g ⊥ and A…”

Section: Calculationmentioning

confidence: 87%

“…The main reason of the above great dierence in |Q CT /Q CF | may be due to the contributions to ∆g and A (2) in both the CF and CT mechanisms depending upon the third-order perturbation terms [note: the second-order terms are absent according to the derivation, see Eq. (2)], whereas those to ∆g ⊥ and A ≈ 13240 cm −1 here), the above large dierence in the relative importance can be understood.…”

Section: Calculationmentioning

confidence: 99%

“…(2)], whereas those to ∆g ⊥ and A ≈ 13240 cm −1 here), the above large dierence in the relative importance can be understood. In consideration of the great relative importance of CT mechanism to ∆g ⊥ and A (2) ⊥ , in the rational and precise calculations of spin-Hamiltonian parameters and the estimations of the local structure of impurity centers (by analyzing the spin-Hamiltonian parameters) for the high-valence state d n ions in crystals, one should apply the method based on the two-mechanism model.…”

Section: Calculationmentioning

confidence: 99%

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Research on the Spin-Hamiltonian Parameters and Local Structure for the Tetragonal Mo⁵⁺Centers in CaWO₄Crystal

2014

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The spin-Hamiltonian parameters (g factors g , g ⊥ and hyperne structure constants A (A), A ⊥ (A), A (B) and A ⊥ (B), A(A) and A(B) belonging to isotopes 95 Mo 5+ and 97 Mo 5+ ) of Mo 5+ ion at the tetragonally-compressed tetrahedral W 6+ site in CaWO4 crystal are calculated from the high-order perturbation formulae based on the two-mechanism model, where besides the contributions to spin-Hamiltonian parameters due to the crystal-eld mechanism concerning the crystal-eld excited states in the extensively-applied crystal-eld theory, those due to charge-transfer mechanism concerning charge-transfer excited states (which are omitted in crystal-eld theory) are included. The calculated results are in reasonable agreement with the experimental values. The calculations show that for the high-valence state d n ions (e. g., Mo 5+ considered) in crystals, the contributions due to charge-transfer mechanism should be taken into account in the studies of spin-Hamiltonian parameters. The local structure of Mo 5+ center in CaWO4 crystal due to the impurity-induced local lattice relaxation is estimated from the calculations. The results are discussed.

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“…It can be seen that the values |Q CT /Q CF | of relative importance of CT mechanism for ∆g and A (2) are much smaller than those for ∆g ⊥ and A…”

Section: Calculationmentioning

confidence: 87%

Section: Calculationmentioning

confidence: 99%

Section: Calculationmentioning

confidence: 99%

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Research on the Spin-Hamiltonian Parameters and Local Structure for the Tetragonal Mo⁵⁺Centers in CaWO₄Crystal

2014

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“…, and maximum quantum efficiency obtained was around 164.03%. However, the discussion on particle's morphology was not presented in this report [49].…”

Section: Effect Of Temperaturementioning

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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“…Although QC phosphors via DC have been investigated for decades for their use in the lighting and display industry, only recently DC through a cooperative energy transfer (CET) process has attracted growing attention in enhancing the efficiency of photovoltaic cells [3,[11][12][13][14]. The most widely used solar cells are based on crystalline silicon (c-Si).…”

Section: Introductionmentioning

confidence: 99%

High-efficient near-infrared quantum cutting based on broadband absorption in Eu2+–Yb3+ co-doped glass for photovoltaic applications

et al. 2015

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We report that Eu 2? -Yb 3? system with high luminescent quantum efficiency and broadband excitation could be playing a significant role in solar cells. This borosilicate glass used as conversion layer can efficiently minimize the energy loss of thermalization. The cooperative energy transfer between Eu 2? and Yb 3? realized the emission of greenish and near-infrared light simultaneously with the blue light of xenon lamp excitation. The emission peaks located at 980 nm and 1,030 nm are the characteristic emission of Yb 3? with the energy matches well with the bandgap of silicon solar cells. The luminescent quantum efficiency is up to 163.5 % with the radiation rate being considered. Given the broad excitation band, high quantum efficiency and excellent mechanical, thermal and chemical stability, this system can be useful as downconversion layer for solar cells.

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Near-infrared luminescence and quantum cutting mechanism in CaWO4:Nd3+, Yb3+

Cited by 32 publications

References 28 publications

Research on the Spin-Hamiltonian Parameters and Local Structure for the Tetragonal Mo⁵⁺Centers in CaWO₄Crystal

Research on the Spin-Hamiltonian Parameters and Local Structure for the Tetragonal Mo⁵⁺Centers in CaWO₄Crystal

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

High-efficient near-infrared quantum cutting based on broadband absorption in Eu2+–Yb3+ co-doped glass for photovoltaic applications

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Near-infrared luminescence and quantum cutting mechanism in CaWO4:Nd3+, Yb3+

Cited by 32 publications

References 28 publications

Research on the Spin-Hamiltonian Parameters and Local Structure for the Tetragonal Mo5+Centers in CaWO4Crystal

Research on the Spin-Hamiltonian Parameters and Local Structure for the Tetragonal Mo5+Centers in CaWO4Crystal

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

High-efficient near-infrared quantum cutting based on broadband absorption in Eu2+–Yb3+ co-doped glass for photovoltaic applications

Contact Info

Product

Resources

About

Research on the Spin-Hamiltonian Parameters and Local Structure for the Tetragonal Mo⁵⁺Centers in CaWO₄Crystal

Research on the Spin-Hamiltonian Parameters and Local Structure for the Tetragonal Mo⁵⁺Centers in CaWO₄Crystal