Broadband Downconversion of Ultraviolet Light to Near‐Infrared Emission in Bi3+–Yb3+‐Codoped Y2O3 Phosphors

Huang, Xiaoyong; Ji, Xiaochen; Zhang, Q. Y.

doi:10.1111/j.1551-2916.2010.04184.x

Cited by 96 publications

(31 citation statements)

References 27 publications

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“…In the energy migration process, the likelihood of energy relaxation by the quenching processes is increased, leading to the decrease of excitation intensity. [5] The result confirms that there is an enhanced ET from Bi 3+ to Yb 3+ by doping Li + . The crystal field symmetry of Bi 3+ in the host matrix could be affected and then changed the luminescence efficiency of Bi 3+ doped materials.…”

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confidence: 80%

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Codoping Li+ to enhance photoluminescence intensity in Y2O3: Bi3+, Yb3+

Wang

2013

International Photonics and Optoelectronics Meetings (POEM)

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Codoping with Li + is an efficient method to enhance the photoluminescence of Bi 3+ -Yb 3+ doped Y 2 O 3 phosphors. It suggests a kind of potential method which may be used to improve the solar cell efficiency. OCIS codes: (250.0250) Optoelectronics; (250.5230) Photoluminescence IntroductionIn single-junction crystalline silicon (c-Si) solar cell, the major energy loss in the conversion of solar energy to electric energy is due to the intrinsic spectral mismatch: low-energy photons cannot be absorbed by the solar cells (subbandgap transmission loss) while high-energy photons cannot be used efficiently (lattice thermalization loss).[1] A promising way to reduce the spectra mismatch losses is to adapt the solar spectrum to better match the solar cell.[2] Thus, shifting of the incident solar spectrum via downconversion using luminescent materials could allow a solar cell to operate at a higher efficiency.[3] Downconversion is to split one higher energy photon to obtain two photons with a smaller energy.[4] It has been calculated that in an ideal case, the energy conversion efficiency of a solar cell can be enhanced from 29% to 38.6% via spectrum shifting. [5] Recently, much attention has been paid to downconversion materials through the energy transfer (ET) between Yb 3+ and other rare-earth ions, such as ion couples of Tb 3+ -Yb 3+ , Tm 3+ -Yb 3+ , Pr 3+ -Yb 3+ , Ce 3+ -Yb 3+ and Er 3+ -Yb 3+ .[6] The Yb 3+ has a relatively simple electronic structure of two energy-level manifolds: the 2 F 7/2 ground state and 2 F 5/2 excited state around 1000 nm in near-infrared (NIR) region, which is located just above the band gap of Si (~1100 nm).[7] However, rare-earth ions as donors feature narrow adsorption line width and low absorption cross-sections for UV-visible photons, resulting in lower direct excitation efficiency and weak NIR emission of Yb 3+ .[8] On this occasion, metal ions with broadband and spin-allowed absorption in the UV-blue region of interest might be an excellent broadband sensitizer for Yb 3+ . So the combination of transition-metal Bi 3+ and Yb 3+ codoped Y 2 O 3 for NIR downconversion luminescence has been exploited, and best ratio is 1% Bi 3+ , 2% Yb 3+ codoped Y 2 O 3 .[5] Bi 3+ have 6s 2 electronic configuration, and the 6s 2 →6s6p transition is also an allowed electric-dipole transition. The emission of Bi 3+ in Y 2 O 3 takes place mainly around 500 nm (the energy is just twice that of the 2 F 7/2 → 2 F 5/2 transition of Yb 3+ ), which suggests the possibility of efficient cooperative energy transfer from Bi 3+ to Yb 3+ .[9] On this basis, dopant of Li + in Y 2 O 3 : 1% Bi 3+ , 2% Yb 3+ sample may be further improving luminescence intensity. Li + with small radius can substitution of larger sized Bi 3+ to enhance downconversion emissions intensities of Y 2 O 3 : 1% Bi 3+ , 2% Yb 3+ due to the distortion of crystal field symmetry of Bi 3+ . [10] In this paper, we reported that codoping x% Li + (x = 0, 1, 3, 5, 7 and 10) in Y 2 O 3 : 1% Bi 3+ , 2% Yb 3+ downconversion powder phosphors are synthesized...

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confidence: 80%

“…[5] Recently, much attention has been paid to downconversion materials through the energy transfer (ET) between Yb 3+ and other rare-earth ions, such as ion couples of Tb 3+ -Yb 3+ , Tm 3+ -Yb 3+ , Pr 3+ -Yb 3+ , Ce 3+ -Yb 3+ and Er 3+ -Yb 3+ .…”

Section: Introductionmentioning

confidence: 99%

Codoping Li+ to enhance photoluminescence intensity in Y2O3: Bi3+, Yb3+

Wang

2013

International Photonics and Optoelectronics Meetings (POEM)

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“…This method has been reported as an effective and low-cost process since it requires low temperature and short time [54]. powder is collected and processed for post heat treatment [55]. Although combustion synthesis can be carried out easily within short time, the high temperature produced from exothermic reactions can deteriorate particle's morphology by agglomeration and pore formation due to release of various gaseous products [58].…”

Section: Combustion Methodsmentioning

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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“…been focused on the s 2 ion Bi 3+ , featuring the relatively strong and broadband absorption in ultraviolet (UV) to blue region [30][31][32]. More recently, efficient downconversion via cooperative energy-transfer (ET) mechanism has been reported in a variety of materials codoped with Bi 3+ and Yb 3+ [33][34][35]. However, evidence for a downconversion mechanism and photon splitting are lacking.…”

Section: Introductionmentioning

confidence: 99%

Thermally deactivated energy transfer in Bi3+−Yb3+

Zhang

et al. 2018

Phys. Rev. B

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Y 2 O 3 codoped with Bi 3+ and Yb 3+ is considered as an efficient downconversion material combining strong broadband absorption of Bi 3+ with photon splitting by cooperative energy transfer from Bi 3+ to two Yb 3+ neighbors. However, evidence for photon splitting is lacking. Here we investigate the Bi 3+-to-Yb 3+ energy-transfer mechanism. For cooperative energy transfer the Yb 3+-concentration-dependent luminescence decay will show clear characteristics of cooperative dipole-dipole transfer. Analysis of Yb 3+-concentration and temperature-dependent decay curves however demonstrates that the energy-transfer mechanism is not cooperative but single step, probably through a Bi 4+-Yb 2+ charge-transfer state. The temperature dependence of the Bi 3+-to-Yb 3+ energy-transfer efficiency is unusual as it decreases with temperature, unlike commonly observed thermally activated energy transfer. This is a signature of energy transfer via exchange interaction. The present results provide evidence for the absence of photon splitting in Y 2 O 3 : Bi 3+ , Yb 3+ and form a convincing demonstration of exchange interaction mediated energy transfer.

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Broadband Downconversion of Ultraviolet Light to Near‐Infrared Emission in Bi³⁺–Yb³⁺‐Codoped Y₂O₃ Phosphors

Cited by 96 publications

References 27 publications

Codoping Li+ to enhance photoluminescence intensity in Y2O3: Bi3+, Yb3+

Codoping Li+ to enhance photoluminescence intensity in Y2O3: Bi3+, Yb3+

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

Thermally deactivated energy transfer in Bi3+−Yb3+

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