Synthesis of Yb3+/Er3+ co-doped Y2O3, YOF and YF3 UC phosphors and their application in solar cell for sub-bandgap photon harvesting

Markose, Kurias K.; Anjana, R; Antony, Aldrin; Jayaraj, M. K.

doi:10.1016/j.jlumin.2018.08.005

Cited by 32 publications

(11 citation statements)

References 34 publications

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“…medical calibration, anticounterfeiting, warning icons, and screen display, red UCL (especially the high-purity red UCL) has been recognized as one of the most important research topics in the field of UC. Unfortunately, there are currently quite limited ways to implement high-purity red UCL. − As is known, Er-doped KNN materials usually exhibit green UC emission, the red UC emission is rarely involved in these materials due to their weak intensity, even if the doped content is 1%–5%. ,,, …”

Section: Introductionmentioning

confidence: 99%

Expedient Red Emitting and Transparency Dual Modulation in KNN-Based Transparent Ceramics via Sensitive Photothermochromic Behavior

Lin

et al. 2021

ACS Appl. Electron. Mater.

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An up-conversion luminescence (UCL) transparent ferroelectric oxide (KNN) introduced by rare-earth ions (Er3+ and Bi3+) has been demonstrated to exhibit a unique, high-purity, red emitting, high transparency, reversible, photothermochromic (PTC) reaction. And, its associated transmittance/red emitting modulations are realized via the continuous alternating of UV light irradiation and heat treatment (200 °C). The effects of the phase structure, microstructure, and oxygen vacancy defects on their optical transmittances and the corresponding optical modulation based on PTC reaction at different sintering temperatures were systematically studied. Because of the sufficiently small grain size, dense structure, and appropriate concentration of oxygen vacancy defects, excellent optical transparency (∼70%, at 900 nm) and moderate PTC modulation contrast (ΔAbs = 13.9%, ΔR = 48.9%) are obtained in KNNEB-1155. The decreased and increased transmittance/red emitting can represent two pairs of “off” and “on” codes, which makes the red-emitting KNNEB transparent ceramics very competitive in the application of multifunctional transparent sustainable warning equipment and optical storage materials.

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Section: Introductionmentioning

confidence: 99%

Expedient Red Emitting and Transparency Dual Modulation in KNN-Based Transparent Ceramics via Sensitive Photothermochromic Behavior

Lin

et al. 2021

ACS Appl. Electron. Mater.

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“…The process of converting a near-infrared (NIR) excitation into a shorter visible or ultraviolet emission via a sequential multiphoton absorption process can be considered as an upconversion mechanism, which was first identified in the field of photonics in the pioneering work by F. Auzel in 1966 . Over the last few decades, upconversion luminescent materials have attracted extensive research interest in science as well as in industry, owing to their exclusive characteristics, such as narrow emission bandwidths, large anti-Stokes shift, multicolor emission, low autofluorescence background, long lifetime, high penetration depth, and high photochemical stability . These unique characteristics enable their application in several optical and optoelectronic systems in the fields of communication, sensing, photodynamic therapy, photonics, photovoltaics, and bioimaging and analysis. − However, the upconversion mechanism is still limited to conventional experimental trial schemes without specific directions because of the different energy-transfer pathways.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Upconversion Photoluminescence of Yb³⁺/Er³⁺:NaLaMgWO₆ Noncytotoxic Double-Perovskite Nanophosphors

2019

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Bright fluorescent rare-earth-ion-doped upconversion nanomaterials are attractive choices for photonic devices. A remarkable green upconversion emission has been obtained by the sensitizing effect of Yb 3+ in a Yb 3+ /Er 3+ :NaLaMgWO 6 (NLMWO) nanophosphor under near-infrared (NIR) excitation. A citrate sol−gel method was employed to synthesize the nanophosphor samples. The lack of a secondary phase in the X-ray diffraction pattern confirms that the Er 3+ and Yb 3+ ions are incorporated in the ordered double-perovskite structure. Surface analysis and particle evaluation are performed by field-emission scanning electron microscopy and transmission electron microscopy analysis. Upconversion and downconversion emission performances were systematically studied by varying the dopant concentrations. A strong upconversion green emission can be observed with the naked eye, and it resembles the upconversion spectra of Er 3+ -doped phosphors. Remarkably, because of an energy-transfer process, the green upconversion emission can be converted into a strong red emission by codoping with Yb 3+ ions. We observed the color tuning effect from green to red, which can be controlled by varying the Yb 3+ concentration in the codoped phosphors during NIR excitation. A systematic investigation of the upconversion mechanism from Yb 3+ to Er 3+ doubly doped NLMWO nanocrystals is demonstrated. The upconversion mechanism was evaluated only by varying the excitation power of the laser as well. A strong NIR emission at 1.57 μm corresponding to Er 3+ can be significantly enhanced by increasing the codoping concentration of Yb 3+ ions. The energy migration pathway is accurately presented. The Commission internationale de l'ećlairage color coordinates were analyzed for singly and doubly doped nanophosphors. The cytotoxicity of the codoped nanophosphor system was evaluated using WI-38 cell lines. This optimized codoped nanophosphor material is noncytotoxic; thus, it can be useful for in vitro studies in biological studies. On the basis of the obtained results, the NLMWO:Yb 3+ /Er 3+ nanophosphors can be a promising choice for novel upconversion photonic applications.

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“…They can also be applied as alternative mercury-free excitation sources for avoiding the use of hazardous ingredients and environmentally unsafe materials [20]. Moreover, they have been recently demonstrated as solar cell materials and high upconversion luminescent materials [21,22].…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Lanthanide-Doped Alkaline Earth Aluminate Phosphors with Enhanced and Long-Persistent Luminescence

Kim

2021

Nanomaterials

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Lanthanide-activated alkaline earth aluminate phosphors are excellent luminescent materials that are designed to overcome the limitations of conventional sulfide-based phosphors. The increasing research attention on these phosphors over the past decade has led to a drastic improvement in their phosphorescence efficiencies and resulted in a wide variety of phosphorescence colors, which can facilitate applications in various areas. This review article discusses the development of lanthanide-activated alkaline earth aluminate phosphors with a focus on the various synthesis methods, persistent luminescence mechanisms, activator and coactivator effects, and the effects of compositions. Particular attention has been devoted to alkaline earth aluminate phosphors that are extensively used, such as strontium-, calcium-, and barium-based aluminates. The role of lanthanide ions as activators and coactivators in phosphorescence emissions was also emphasized. Finally, we address recent techniques involving nanomaterial engineering that have also produced lanthanide-activated alkaline earth aluminate phosphors with long-persistent luminescence.

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Synthesis of Yb3+/Er3+ co-doped Y2O3, YOF and YF3 UC phosphors and their application in solar cell for sub-bandgap photon harvesting

Cited by 32 publications

References 34 publications

Expedient Red Emitting and Transparency Dual Modulation in KNN-Based Transparent Ceramics via Sensitive Photothermochromic Behavior

Expedient Red Emitting and Transparency Dual Modulation in KNN-Based Transparent Ceramics via Sensitive Photothermochromic Behavior

Investigation of Upconversion Photoluminescence of Yb³⁺/Er³⁺:NaLaMgWO₆ Noncytotoxic Double-Perovskite Nanophosphors

Recent Developments in Lanthanide-Doped Alkaline Earth Aluminate Phosphors with Enhanced and Long-Persistent Luminescence

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Synthesis of Yb3+/Er3+ co-doped Y2O3, YOF and YF3 UC phosphors and their application in solar cell for sub-bandgap photon harvesting

Cited by 32 publications

References 34 publications

Expedient Red Emitting and Transparency Dual Modulation in KNN-Based Transparent Ceramics via Sensitive Photothermochromic Behavior

Expedient Red Emitting and Transparency Dual Modulation in KNN-Based Transparent Ceramics via Sensitive Photothermochromic Behavior

Investigation of Upconversion Photoluminescence of Yb3+/Er3+:NaLaMgWO6 Noncytotoxic Double-Perovskite Nanophosphors

Recent Developments in Lanthanide-Doped Alkaline Earth Aluminate Phosphors with Enhanced and Long-Persistent Luminescence

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Investigation of Upconversion Photoluminescence of Yb³⁺/Er³⁺:NaLaMgWO₆ Noncytotoxic Double-Perovskite Nanophosphors