The Experts below are selected from a list of 28452 Experts worldwide ranked by ideXlab platform
Setsuhisa Tanabe - One of the best experts on this subject based on the ideXlab platform.
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investigation of luminescence quenching and persistent luminescence in ce3 doped gd y 3 al ga 5o12 garnet using vacuum referred binding energy diagram
Journal of Luminescence, 2018Co-Authors: Kazuki Asami, Jumpei Ueda, Mamoru Kitaura, Setsuhisa TanabeAbstract:Abstract Optical properties of Ce3+:5d−4f luminescence in garnet compounds are strongly related to the energy locations of the excited 5d levels and the host conduction band (CB). By constructing the vacuum referred binding energy (VRBE) diagram including information on these energy location for GdyY3-yAl5-xGaxO12 garnet (GYAGG) from the measured spectroscopic data, the luminescence quenching and persistent luminescence properties of GYAGG:Ce3+(-Cr3+) were discussed. The quantum yield (QY) of Ce3+:5d−4f in GYAGG:Ce3+ is clearly related to the energy gap, Δ E 5 d 1 − C B , between the lowest 5d level and the bottom of conduction band in the constructed VRBE diagram. This result indicates that the luminescence quenching of GYAGG:Ce3+ is caused by the thermal ionization. For GYAGG:Ce3+-Cr3+ persistent phosphors, the depth of the Electron Trap formed by Cr3+ was remarkably changed from 0.27 to 0.69 eV by varying the Gd and Ga contents. The estimated VRBE value of Cr2+ in GYAGG can be used as effective value to predict the Electron Trap depth by Cr3+ in other oxide compounds as well as garnet hosts.
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enhanced persistent red luminescence in mn2 doped mg zn geo3 by Electron Trap and conduction band engineering
Optical Materials, 2018Co-Authors: Jumpei Ueda, Yumiko Katayama, Tomohiro Kayumi, Setsuhisa TanabeAbstract:Abstract The effect of Zn substitution on the persistent luminescence properties of MgGeO3:Mn2+-Ln3+ (Ln = Eu and Yb) red phosphors was investigated. The intensity of the persistent luminescence of the Eu3+ co-doped phosphors increased with increasing Zn content, whereas that of the Yb3+ co-doped samples decreased. For both series of lanthanide co-doped samples, the thermoluminescence (TL) glow peak shifted to the lower temperature side with increasing Zn content. These persistent luminescence properties were well explained in terms of lowering of the bottom of the conduction band relative to the ground state of the divalent lanthanide ions. Especially, in Eu3+ co-doped system, TL peak shifted from 520 K to 318 K by 50% Zn substitution. The persistent radiance of the (Mg0.5 Zn0.5)GeO3: Mn2+-Eu3+ sample at 1 h after ceasing UV light was 46 times stronger than that of MgGeO3:Mn2+-Eu3+, and 11 times stronger than that of ZnGa2O4: Cr3+ standard deep red persistent phosphor.
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toward rechargeable persistent luminescence for the first and third biological windows via persistent energy transfer and Electron Trap redistribution
Inorganic Chemistry, 2018Co-Authors: Daisuke Murata, Jumpei Ueda, Bruno Viana, Setsuhisa TanabeAbstract:Persistent luminescence (PersL) imaging without real-time external excitation has been regarded as the next generation of autofluorescence-free optical imaging technology. However, to achieve improved imaging resolution and deep tissue penetration, developing new near-infrared (NIR) persistent phosphors with intense and long duration PersL over 1000 nm is still a challenging but urgent task in this field. Herein, making use of the persistent energy transfer process from Cr3+ to Er3+, we report a novel garnet persistent phosphor of Y3Al2Ga3O12 codoped with Er3+ and Cr3+ (YAGG:Er–Cr), which shows intense Cr3+ PersL (∼690 nm) in the deep red region matching well with the first biological window (NIR-I, 650–950 nm) and Er3+ PersL (∼1532 nm) in the NIR region matching well with the third biological window (NIR-III, 1500–1800 nm). The optical imaging through raw-pork tissues (thickness of 1 cm) suggests that the emission band of Er3+ can achieve higher spatial resolution and more accurate signal location than t...
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design of deep red persistent phosphors of gd_3al_5 xga_xo_12 cr 3 transparent ceramics sensitized by eu 3 as an Electron Trap using conduction band engineering
Optical Materials Express, 2015Co-Authors: Jumpei Ueda, Setsuhisa TanabeAbstract:We developed bright deep-red persistent phosphors of Cr3+-Eu3+ co-doped Gd3Al5-xGaxO12 garnet (GAGG:Cr3+-Eu3+), in which only Cr3+ ion shows emission bands centered at 730 nm after ceasing UV illumination and Eu3+ ion acts as an excellent Electron Trap capturing one Electron to be Eu2+ with tunable Trap depth by varying conduction band with Ga3+ content, x. The persistent radiance of the GGG:Cr3+-Eu3+ (x = 5) sample at 1 h after ceasing UV light is approximately 25 times higher than that of the Cr3+ singly doped GGG sample, and is over 6 times higher than that of the widely used ZnGa2O4:Cr3+ red persistent phosphor.
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design of deep red persistent phosphors of gd 3 al 5 x ga x o 12 cr 3 transparent ceramics sensitized by eu 3 as an Electron Trap using conduction band engineering
Optical Materials Express, 2015Co-Authors: Jian Xu, Jumpei Ueda, Setsuhisa TanabeAbstract:We developed bright deep-red persistent phosphors of Cr3+-Eu3+ co-doped Gd3Al5-xGaxO12 garnet (GAGG:Cr3+-Eu3+), in which only Cr3+ ion shows emission bands centered at 730 nm after ceasing UV illumination and Eu3+ ion acts as an excellent Electron Trap capturing one Electron to be Eu2+ with tunable Trap depth by varying conduction band with Ga3+ content, x. The persistent radiance of the GGG:Cr3+-Eu3+ (x = 5) sample at 1 h after ceasing UV light is approximately 25 times higher than that of the Cr3+ singly doped GGG sample, and is over 6 times higher than that of the widely used ZnGa2O4:Cr3+ red persistent phosphor.
Chen Cao - One of the best experts on this subject based on the ideXlab platform.
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bipolar blue host emitter with unity quantum yield allows full exciton radiation in single emissive layer hybrid white organic light emitting diodes
ACS Applied Materials & Interfaces, 2019Co-Authors: Chen Cao, Wen-cheng Chen, Jia-xiong Chen, Lei Yang, Xue-zhi Wang, Hu Yang, Bin Huang, Ze-lin ZhuAbstract:Phosphorescence/fluorescence hybrid white organic light-emitting diodes (OLEDs) are highly appealing for solid-state lighting. One major challenge is how to fully utilize the electrically generated excitons for light output. Herein, an efficient strategy to realize full exciton radiation is successfully revealed by a judicious molecular design and suitable device engineering. A blue host emitter TP-PPI is designed and synthesized, exhibiting a near 100% photoluminescence quantum yield and a high triplet energy level, enabling high-performance blue fluorescence and sensitization of a yellow phosphorescent dopant. Full exciton radiation in hybrid white OLEDs is demonstrated with a single emitting layer formed by doping a yellow phosphor (PO-01) into TP-PPI. Near 100% exciton utilization and state-of-the-art external quantum efficiency of 27.5% are achieved with the high-efficiency blue-emitting host and an Electron-Trap engineered device architecture.
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Bipolar Blue Host Emitter with Unity Quantum Yield Allows Full Exciton Radiation in Single-Emissive-Layer Hybrid White Organic Light-Emitting Diodes
2019Co-Authors: Chen Cao, Wen-cheng Chen, Jia-xiong Chen, Lei Yang, Xue-zhi Wang, Hu Yang, Bin Huang, Ze-lin Zhu, Qing-xiao Tong, Chun-sing LeeAbstract:Phosphorescence/fluorescence hybrid white organic light-emitting diodes (OLEDs) are highly appealing for solid-state lighting. One major challenge is how to fully utilize the electrically generated excitons for light output. Herein, an efficient strategy to realize full exciton radiation is successfully revealed by a judicious molecular design and suitable device engineering. A blue host emitter TP-PPI is designed and synthesized, exhibiting a near 100% photoluminescence quantum yield and a high triplet energy level, enabling high-performance blue fluorescence and sensitization of a yellow phosphorescent dopant. Full exciton radiation in hybrid white OLEDs is demonstrated with a single emitting layer formed by doping a yellow phosphor (PO-01) into TP-PPI. Near 100% exciton utilization and state-of-the-art external quantum efficiency of 27.5% are achieved with the high-efficiency blue-emitting host and an Electron-Trap engineered device architecture
Yuji Suzuki - One of the best experts on this subject based on the ideXlab platform.
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effect of end group of amorphous perfluoro polymer electrets on Electron Trapping
Science and Technology of Advanced Materials, 2018Co-Authors: S H Kim, Kuniko Suzuki, Ai Sugie, Hiroyuki Yoshida, Masafumi Yoshida, Yuji SuzukiAbstract:Charge Trap in amorphous perfluoro-polymer electret is studied, focusing on Electron Trap site and Trap energy. Low-energy inverse photoElectron spectroscopy is adopted to measure solid-state elect...
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effect of end group of amorphous perfluoro polymer electrets on Electron Trapping
Science and Technology of Advanced Materials, 2018Co-Authors: Seonwoo Kim, Kuniko Suzuki, Ai Sugie, Hiroyuki Yoshida, Masafumi Yoshida, Yuji SuzukiAbstract:Charge Trap in amorphous perfluoro-polymer electret is studied, focusing on Electron Trap site and Trap energy. Low-energy inverse photoElectron spectroscopy is adopted to measure solid-state Electron affinity (EA) of cyclic transparent optical polymer (CYTOP). EA of CYTOP CTL-S is discovered by compensating the unwanted charge-up effect. Negatively-charged electret materials (polyethylene, ethylene-tetra-fluoro-ethylene, poly-tetra-fluoro-ethylene, and CYTOP) are analyzed by quantum mechanical calculation. Density functional theory with long-range correction is adopted to analyze orbital energies of single molecular systems. Intramolecular distribution of Trapped Electron and EA are investigated. Calculated Electron affinities of CYTOP polymers with different end group are qualitatively in accordance with Trapped charge stability measured with thermal stimulated discharge, signifying that Electron affinities obtained with the present simulation can be used as an index of amorphous polymer electret.
Ze-lin Zhu - One of the best experts on this subject based on the ideXlab platform.
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bipolar blue host emitter with unity quantum yield allows full exciton radiation in single emissive layer hybrid white organic light emitting diodes
ACS Applied Materials & Interfaces, 2019Co-Authors: Chen Cao, Wen-cheng Chen, Jia-xiong Chen, Lei Yang, Xue-zhi Wang, Hu Yang, Bin Huang, Ze-lin ZhuAbstract:Phosphorescence/fluorescence hybrid white organic light-emitting diodes (OLEDs) are highly appealing for solid-state lighting. One major challenge is how to fully utilize the electrically generated excitons for light output. Herein, an efficient strategy to realize full exciton radiation is successfully revealed by a judicious molecular design and suitable device engineering. A blue host emitter TP-PPI is designed and synthesized, exhibiting a near 100% photoluminescence quantum yield and a high triplet energy level, enabling high-performance blue fluorescence and sensitization of a yellow phosphorescent dopant. Full exciton radiation in hybrid white OLEDs is demonstrated with a single emitting layer formed by doping a yellow phosphor (PO-01) into TP-PPI. Near 100% exciton utilization and state-of-the-art external quantum efficiency of 27.5% are achieved with the high-efficiency blue-emitting host and an Electron-Trap engineered device architecture.
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Bipolar Blue Host Emitter with Unity Quantum Yield Allows Full Exciton Radiation in Single-Emissive-Layer Hybrid White Organic Light-Emitting Diodes
2019Co-Authors: Chen Cao, Wen-cheng Chen, Jia-xiong Chen, Lei Yang, Xue-zhi Wang, Hu Yang, Bin Huang, Ze-lin Zhu, Qing-xiao Tong, Chun-sing LeeAbstract:Phosphorescence/fluorescence hybrid white organic light-emitting diodes (OLEDs) are highly appealing for solid-state lighting. One major challenge is how to fully utilize the electrically generated excitons for light output. Herein, an efficient strategy to realize full exciton radiation is successfully revealed by a judicious molecular design and suitable device engineering. A blue host emitter TP-PPI is designed and synthesized, exhibiting a near 100% photoluminescence quantum yield and a high triplet energy level, enabling high-performance blue fluorescence and sensitization of a yellow phosphorescent dopant. Full exciton radiation in hybrid white OLEDs is demonstrated with a single emitting layer formed by doping a yellow phosphor (PO-01) into TP-PPI. Near 100% exciton utilization and state-of-the-art external quantum efficiency of 27.5% are achieved with the high-efficiency blue-emitting host and an Electron-Trap engineered device architecture
Bin Huang - One of the best experts on this subject based on the ideXlab platform.
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bipolar blue host emitter with unity quantum yield allows full exciton radiation in single emissive layer hybrid white organic light emitting diodes
ACS Applied Materials & Interfaces, 2019Co-Authors: Chen Cao, Wen-cheng Chen, Jia-xiong Chen, Lei Yang, Xue-zhi Wang, Hu Yang, Bin Huang, Ze-lin ZhuAbstract:Phosphorescence/fluorescence hybrid white organic light-emitting diodes (OLEDs) are highly appealing for solid-state lighting. One major challenge is how to fully utilize the electrically generated excitons for light output. Herein, an efficient strategy to realize full exciton radiation is successfully revealed by a judicious molecular design and suitable device engineering. A blue host emitter TP-PPI is designed and synthesized, exhibiting a near 100% photoluminescence quantum yield and a high triplet energy level, enabling high-performance blue fluorescence and sensitization of a yellow phosphorescent dopant. Full exciton radiation in hybrid white OLEDs is demonstrated with a single emitting layer formed by doping a yellow phosphor (PO-01) into TP-PPI. Near 100% exciton utilization and state-of-the-art external quantum efficiency of 27.5% are achieved with the high-efficiency blue-emitting host and an Electron-Trap engineered device architecture.
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Bipolar Blue Host Emitter with Unity Quantum Yield Allows Full Exciton Radiation in Single-Emissive-Layer Hybrid White Organic Light-Emitting Diodes
2019Co-Authors: Chen Cao, Wen-cheng Chen, Jia-xiong Chen, Lei Yang, Xue-zhi Wang, Hu Yang, Bin Huang, Ze-lin Zhu, Qing-xiao Tong, Chun-sing LeeAbstract:Phosphorescence/fluorescence hybrid white organic light-emitting diodes (OLEDs) are highly appealing for solid-state lighting. One major challenge is how to fully utilize the electrically generated excitons for light output. Herein, an efficient strategy to realize full exciton radiation is successfully revealed by a judicious molecular design and suitable device engineering. A blue host emitter TP-PPI is designed and synthesized, exhibiting a near 100% photoluminescence quantum yield and a high triplet energy level, enabling high-performance blue fluorescence and sensitization of a yellow phosphorescent dopant. Full exciton radiation in hybrid white OLEDs is demonstrated with a single emitting layer formed by doping a yellow phosphor (PO-01) into TP-PPI. Near 100% exciton utilization and state-of-the-art external quantum efficiency of 27.5% are achieved with the high-efficiency blue-emitting host and an Electron-Trap engineered device architecture