New materials have been developed for PDP for fast addressing and power reduction.They show the transition in R&D from materials invented accidentally to materials-by-design.Cathode-luminescence on MgO crystals is...New materials have been developed for PDP for fast addressing and power reduction.They show the transition in R&D from materials invented accidentally to materials-by-design.Cathode-luminescence on MgO crystals is used to compare thermally assisted recombination and tunneling.Bethe Salpeter equations(BSE) are used to predict the exciton properties of mixed oxides like MgCaO.Using new materials an ultra-thin(300 μm) and flexible Shadow-Mask PDP has been realized.The same device is also operated in a reverse mode,where high energy radiation is imaged,using the Gaseous Electron Multiplier(GEM) effect in the Townsend展开更多
A phase-only computer-generated holography（CGH） calculation method for stereoscopic holography is proposed in this paper.The two-dimensional（2D） perspective projection views of the three-dimensional（3D） object a...A phase-only computer-generated holography（CGH） calculation method for stereoscopic holography is proposed in this paper.The two-dimensional（2D） perspective projection views of the three-dimensional（3D） object are generated by the computer graphics rendering techniques.Based on these views,a phase-only hologram is calculated by using the Gerchberg–Saxton（GS） iterative algorithm.Comparing with the non-iterative algorithm in the conventional stereoscopic holography,the proposed method improves the holographic image quality,especially for the phase-only hologram encoded from the complex distribution.Both simulation and optical experiment results demonstrate that our proposed method can give higher quality reconstruction comparing with the traditional method.展开更多
The relationship between infrared light （IR） and vacuum ultraviolet （VUV） emission in shadow mask plasma display panels （SMPDP） at high xenon content and high voltage is investigated. The respective ratios of VI...The relationship between infrared light （IR） and vacuum ultraviolet （VUV） emission in shadow mask plasma display panels （SMPDP） at high xenon content and high voltage is investigated. The respective ratios of VIS/IR-823 am, VIS/IR-828 nm and of efficacy/VIS/IR-823 nm, efficacy/VIS/IR-823 nm are calculated to determine the behavior of the xenon excitation efficiency and the electron excitation efficiency as a function of the driving voltage and xenon content. It is found that the xenon excitation efficiency is almost independent of the driving voltage, and increases approximately linearly with the xenon content. The values for efficacy/VIS/IR-828 nm increase rapidly with the xenon content, but saturate at a xenon ratio of about 30% while, on the other hand, the efficacy/VIS/IR-823 nm values decrease continuously with the xenon content.展开更多
It is demonstrated that barium and aluminum alloy synthesized by melting in a glass tube under low vacuum is applicable for organic laser emitting diodes(LEDs)as a thin film cathode.The alloy film obtained by the ther...It is demonstrated that barium and aluminum alloy synthesized by melting in a glass tube under low vacuum is applicable for organic laser emitting diodes(LEDs)as a thin film cathode.The alloy film obtained by the thermal evaporation of pre-synthesized alloy is used in a single-boat organic LED device with the structure:indium tin oxide(ITO)/4,4'-bis[N−(1-naphthyl)-N−phenylamino]biphenyl(NPB)/tris-(8-hydroxyquinoline)aluminum(Alq3)/barium:aluminum alloy.The experimental results show that devices with this alloy film cathode exhibit better current density-voltage-luminance characteristics than those with a conventional pure Al cathode,and more weight of barium in aluminum leads to better performance of the devices.Characteristics of current density versus voltage for the electron-only devices are fitted by the Richardson–Schottky emission model,indicating that the electron injection barrier has a decrease of about 0.3 eV by this alloy cathode.展开更多
Atomic layer infiltration technology allows the formation of a nanometer-thick polymer-inorganic hybrid barrier layer in polymer material for flexible organic light-emitting diode(OLED)displays.In this study,according...Atomic layer infiltration technology allows the formation of a nanometer-thick polymer-inorganic hybrid barrier layer in polymer material for flexible organic light-emitting diode(OLED)displays.In this study,according to transmission electron microscopy and secondary-ion mass spectrometry analysis results under various process conditions,a compact polymer-inorganic hybrid nanolayer was successfully formed in a polymer and good barrier performance was revealed with a low water vapor transmission rate under optimal process conditions.Additionally,through gas chromatography-mass spectrometry measurements after ultra-violet radiation testing,polymer out-gassing decreased compared to bare polymers.Based on barrier properties,the polymer with a polymer-inorganic hybrid barrier nanolayer was applied to a flexible OLED display as a substrate.During storage tests and folding tests,the flexible OLED display exhibits good reliability and better flexibility compared to those with an inorganic barrier layer.These results confirm that the polymer-inorganic hybrid nanolayer is suitable for barrier layer formation in flexible OLED displays.展开更多
We introduce a novel stretchable photodetector with enhanced multi-light source detection,capable of discriminating light sources using artificial intelligence(AI).These features highlight the application potential of...We introduce a novel stretchable photodetector with enhanced multi-light source detection,capable of discriminating light sources using artificial intelligence(AI).These features highlight the application potential of deep learning enhanced photodetectors in applications that require accurate for visual light communication(VLC).Experimental results showcased its excellent potential in real-world traffic system.This photodetector,fabricated using a composite structure of silver nanowires(AgNWs)/zinc sulfide(ZnS)-polyurethane acrylate(PUA)/AgNWs,maintained stable performance under 25%tensile strain and 2 mm bending radius.It shows high sensitivity at both 448 and 505 nm wavelengths,detecting light sources under mechanical deformations,different wavelengths and frequencies.By integrating a one-dimensional convolutional neural network(1D-CNN)model,we classified the light source power level with 96.52%accuracy even the light of two wavelengths is mixed.The model’s performance remains consistent across flat,bent,and stretched states,setting a precedent for flexible electronics combined with AI in dynamic environments.展开更多
Atomically thin suspended graphene can be used as NEMS transducers for ultra-small and high-performance sensors due to its excellent mechanical and electrical properties.Most applications of suspended graphene in NEMS...Atomically thin suspended graphene can be used as NEMS transducers for ultra-small and high-performance sensors due to its excellent mechanical and electrical properties.Most applications of suspended graphene in NEMS devices are limited to pressure sensors,resonators,switches,etc.Graphene-based NEMS accelerometers have rarely been reported,with limitations such as mechanical robustness,life span and device yield,thereby limiting their practical applications.Here,we reported piezoresistive graphene-based NEMS accelerometers with high manufacturing yield,excellent mechanical robustness and stability,and long life span,in which the width of trenches for suspending graphene membranes was only 1µm and fully-clamped suspended double-layer graphene membranes with an attached SiO_(2)/Si proof mass was used as acceleration transducer.The impact of geometrical sizes of the proof mass attached to the suspended graphene membranes on the output signal of devices has been studied.These findings would contribute to rapid developments and practical applications of ultra-small and high-performance graphene-based NEMS accelerometers and related devices.展开更多
We report the use of ultra-short, pulsed-laser annealed Ti/Au contacts to enhance the performance of multilayer MoS2 field effect transistors （FETs） on flexible plastic substrates without thermal damage. An analysis...We report the use of ultra-short, pulsed-laser annealed Ti/Au contacts to enhance the performance of multilayer MoS2 field effect transistors （FETs） on flexible plastic substrates without thermal damage. An analysis of the temperature distribution, based on finite difference methods, enabled understanding of the compatibility of our picosecond laser annealing for flexible poly（ethylene naphthalate） （PEN） substrates with low thermal budget （〈 200 ℃）. The reduced contact resistance after laser annealing provided a significant improvement in transistor performance including higher peak field-effect mobility （from 24.84 to 44.84 cm2-V-l.s-1）, increased output resistance （0.42 MΩ at Vgs- Vth = 20 V, a three-fold increase）, a six-fold increase in the self-gain, and decreased sub- threshold swing. Transmission electron microscopy analysis and current-voltage measurements suggested that the reduced contact resistance resulted from the decrease of Schottky barrier width at the MoS2-metal junction. These results demonstrate that selective contact laser annealing is an attractive technology for fabricating low-resistivity metal-semiconductor junctions, providing important implications for the application of high-performance two-dimensional semicon- ductor FETs in flexible electronics.展开更多
Several approaches for fast generation of digital holograms of a three-dimensional （3D） object have been discussed. Among them, the novel look-up table （N-LUT） method is analyzed to dramatically reduce the number ...Several approaches for fast generation of digital holograms of a three-dimensional （3D） object have been discussed. Among them, the novel look-up table （N-LUT） method is analyzed to dramatically reduce the number of pre-calculated fringe patterns required for computation of digital holograms of a 3D object by employing a new concept of principal fringe patterns, so that problems of computational complexity and huge memory size of the conventional ray-tracing and look-up table methods have been considerably alleviated. Meanwhile, as the 3D video images have a lot of temporally or spatially redundant data in their inter- and intra-frames, computation time of the 3D video holograms could be also reduced just by removing these redundant data. Thus, a couple of computational methods for generation of 3D video holograms by combined use of the N-LUT method and data compression algorithms are also presented and discussed. Some experimental results finally reveal that by using this approach a great reduction of computation time of 3D video holograms could be achieved.展开更多
Phototransistors that can detect visible light have been fabricated using solution processed zinc oxide channel/zirconium oxide gate insulator thin film transistors(TFTs)and room temperature synthesized perovskite qua...Phototransistors that can detect visible light have been fabricated using solution processed zinc oxide channel/zirconium oxide gate insulator thin film transistors(TFTs)and room temperature synthesized perovskite quantum dots(PeQDs)as active layer.Typical ZnO thin film transistors did not show a photocurrent under visible light illumination.However,ZnO TFTs decorated with PeQDs exhibited enhanced photocurrent upon exposure to visible light.The device had a responsivity of 567 A/W(617 A/W),a high detectivity of 6.59×10^(13)Jones(1.85×10^(14)J)and a high sensitivity of 10^(7)(10^(8))under green(blue)light at a low drain voltage of 0.1 V.The high photo-responsivity and detectivity under green light resulted from the combination of short ligands in the QDs films and the high mobility of the spray coated ZnO films.Those results are relevant for the development of low cost and low energy consumption phototransistors working in the visible range.展开更多
We report Al/MoO3 thin film used as a complex anode in high-performance OLEDs. The unique efficacy of the device was found to result from the enhanced injection of holes into the commonly used hole-transporting molecu...We report Al/MoO3 thin film used as a complex anode in high-performance OLEDs. The unique efficacy of the device was found to result from the enhanced injection of holes into the commonly used hole-transporting molecules due to a large reduction in the interface dipole at the anode/organic interface. The superior optical charac-teristics are attributed to a strong cavity effect, Due to the ease of processing Al/MoO3 we successfully demonstrated large-area flexible OLEDs on plastic substrates with uniform emission.展开更多
基金supported by the National Natural Science Foundation of China(60871015)the National High Technology Research(863 Program of China(2008AA03A308))Innovation Project of Jiangsu Graduate Education(CXZZ11_0143)
文摘New materials have been developed for PDP for fast addressing and power reduction.They show the transition in R&D from materials invented accidentally to materials-by-design.Cathode-luminescence on MgO crystals is used to compare thermally assisted recombination and tunneling.Bethe Salpeter equations(BSE) are used to predict the exciton properties of mixed oxides like MgCaO.Using new materials an ultra-thin(300 μm) and flexible Shadow-Mask PDP has been realized.The same device is also operated in a reverse mode,where high energy radiation is imaged,using the Gaseous Electron Multiplier(GEM) effect in the Townsend
基金Project supported by the National Basic Research Program of China(Grant No.2013CB328803)the National High Technology Research and Development Program of China(Grant Nos.2013AA013904 and 2015AA016301)
文摘A phase-only computer-generated holography（CGH） calculation method for stereoscopic holography is proposed in this paper.The two-dimensional（2D） perspective projection views of the three-dimensional（3D） object are generated by the computer graphics rendering techniques.Based on these views,a phase-only hologram is calculated by using the Gerchberg–Saxton（GS） iterative algorithm.Comparing with the non-iterative algorithm in the conventional stereoscopic holography,the proposed method improves the holographic image quality,especially for the phase-only hologram encoded from the complex distribution.Both simulation and optical experiment results demonstrate that our proposed method can give higher quality reconstruction comparing with the traditional method.
基金supported by National Natural Science Foundation of China (No. 60571033)the National Hi'Tech projects of China (No. 2008AA03A308)Programme of Introducing Talents of Discipline to Universities of China (B07027)
文摘The relationship between infrared light （IR） and vacuum ultraviolet （VUV） emission in shadow mask plasma display panels （SMPDP） at high xenon content and high voltage is investigated. The respective ratios of VIS/IR-823 am, VIS/IR-828 nm and of efficacy/VIS/IR-823 nm, efficacy/VIS/IR-823 nm are calculated to determine the behavior of the xenon excitation efficiency and the electron excitation efficiency as a function of the driving voltage and xenon content. It is found that the xenon excitation efficiency is almost independent of the driving voltage, and increases approximately linearly with the xenon content. The values for efficacy/VIS/IR-828 nm increase rapidly with the xenon content, but saturate at a xenon ratio of about 30% while, on the other hand, the efficacy/VIS/IR-823 nm values decrease continuously with the xenon content.
基金by the National Natural Science Foundation of China under Grant No 61076066the Doctor Foundation of the Shaanxi University of Science and Technology(No BJ09-07).
文摘It is demonstrated that barium and aluminum alloy synthesized by melting in a glass tube under low vacuum is applicable for organic laser emitting diodes(LEDs)as a thin film cathode.The alloy film obtained by the thermal evaporation of pre-synthesized alloy is used in a single-boat organic LED device with the structure:indium tin oxide(ITO)/4,4'-bis[N−(1-naphthyl)-N−phenylamino]biphenyl(NPB)/tris-(8-hydroxyquinoline)aluminum(Alq3)/barium:aluminum alloy.The experimental results show that devices with this alloy film cathode exhibit better current density-voltage-luminance characteristics than those with a conventional pure Al cathode,and more weight of barium in aluminum leads to better performance of the devices.Characteristics of current density versus voltage for the electron-only devices are fitted by the Richardson–Schottky emission model,indicating that the electron injection barrier has a decrease of about 0.3 eV by this alloy cathode.
文摘Atomic layer infiltration technology allows the formation of a nanometer-thick polymer-inorganic hybrid barrier layer in polymer material for flexible organic light-emitting diode(OLED)displays.In this study,according to transmission electron microscopy and secondary-ion mass spectrometry analysis results under various process conditions,a compact polymer-inorganic hybrid nanolayer was successfully formed in a polymer and good barrier performance was revealed with a low water vapor transmission rate under optimal process conditions.Additionally,through gas chromatography-mass spectrometry measurements after ultra-violet radiation testing,polymer out-gassing decreased compared to bare polymers.Based on barrier properties,the polymer with a polymer-inorganic hybrid barrier nanolayer was applied to a flexible OLED display as a substrate.During storage tests and folding tests,the flexible OLED display exhibits good reliability and better flexibility compared to those with an inorganic barrier layer.These results confirm that the polymer-inorganic hybrid nanolayer is suitable for barrier layer formation in flexible OLED displays.
基金supported by National Research Foundation of Korea(NRF)grants(Number RS-2023-00247545)funded by the Korean government(MSIP)funded and conducted under the Competency Development Program for Industry Specialists of the Korean Ministry of Trade,Industry and Energy(MOTIE),operated by Korea Institute for Advancement of Technology(KIAT)(No.P0023704,SemiconductorTrack Graduate School(SKKU)).
文摘We introduce a novel stretchable photodetector with enhanced multi-light source detection,capable of discriminating light sources using artificial intelligence(AI).These features highlight the application potential of deep learning enhanced photodetectors in applications that require accurate for visual light communication(VLC).Experimental results showcased its excellent potential in real-world traffic system.This photodetector,fabricated using a composite structure of silver nanowires(AgNWs)/zinc sulfide(ZnS)-polyurethane acrylate(PUA)/AgNWs,maintained stable performance under 25%tensile strain and 2 mm bending radius.It shows high sensitivity at both 448 and 505 nm wavelengths,detecting light sources under mechanical deformations,different wavelengths and frequencies.By integrating a one-dimensional convolutional neural network(1D-CNN)model,we classified the light source power level with 96.52%accuracy even the light of two wavelengths is mixed.The model’s performance remains consistent across flat,bent,and stretched states,setting a precedent for flexible electronics combined with AI in dynamic environments.
基金supported by the National Natural Science Foundation of China(Grant Nos.62171037 and 62088101)Beijing Natural Science Foundation(4232076)+1 种基金National Science Fund for Excellent Young Scholars(Overseas)Beijing Institute of Technology Teli Young Fellow Program(2021TLQT012)。
文摘Atomically thin suspended graphene can be used as NEMS transducers for ultra-small and high-performance sensors due to its excellent mechanical and electrical properties.Most applications of suspended graphene in NEMS devices are limited to pressure sensors,resonators,switches,etc.Graphene-based NEMS accelerometers have rarely been reported,with limitations such as mechanical robustness,life span and device yield,thereby limiting their practical applications.Here,we reported piezoresistive graphene-based NEMS accelerometers with high manufacturing yield,excellent mechanical robustness and stability,and long life span,in which the width of trenches for suspending graphene membranes was only 1µm and fully-clamped suspended double-layer graphene membranes with an attached SiO_(2)/Si proof mass was used as acceleration transducer.The impact of geometrical sizes of the proof mass attached to the suspended graphene membranes on the output signal of devices has been studied.These findings would contribute to rapid developments and practical applications of ultra-small and high-performance graphene-based NEMS accelerometers and related devices.
文摘We report the use of ultra-short, pulsed-laser annealed Ti/Au contacts to enhance the performance of multilayer MoS2 field effect transistors （FETs） on flexible plastic substrates without thermal damage. An analysis of the temperature distribution, based on finite difference methods, enabled understanding of the compatibility of our picosecond laser annealing for flexible poly（ethylene naphthalate） （PEN） substrates with low thermal budget （〈 200 ℃）. The reduced contact resistance after laser annealing provided a significant improvement in transistor performance including higher peak field-effect mobility （from 24.84 to 44.84 cm2-V-l.s-1）, increased output resistance （0.42 MΩ at Vgs- Vth = 20 V, a three-fold increase）, a six-fold increase in the self-gain, and decreased sub- threshold swing. Transmission electron microscopy analysis and current-voltage measurements suggested that the reduced contact resistance resulted from the decrease of Schottky barrier width at the MoS2-metal junction. These results demonstrate that selective contact laser annealing is an attractive technology for fabricating low-resistivity metal-semiconductor junctions, providing important implications for the application of high-performance two-dimensional semicon- ductor FETs in flexible electronics.
基金supported by the MKE (Ministry of Knowledge Economy), Korea, under the ITRC (Informa-tion Technology Research Center)support program su-pervised by the NIPA (National IT Industry Promotion Agency) (NIPA-2009-C1090-0902-0018)
文摘Several approaches for fast generation of digital holograms of a three-dimensional （3D） object have been discussed. Among them, the novel look-up table （N-LUT） method is analyzed to dramatically reduce the number of pre-calculated fringe patterns required for computation of digital holograms of a 3D object by employing a new concept of principal fringe patterns, so that problems of computational complexity and huge memory size of the conventional ray-tracing and look-up table methods have been considerably alleviated. Meanwhile, as the 3D video images have a lot of temporally or spatially redundant data in their inter- and intra-frames, computation time of the 3D video holograms could be also reduced just by removing these redundant data. Thus, a couple of computational methods for generation of 3D video holograms by combined use of the N-LUT method and data compression algorithms are also presented and discussed. Some experimental results finally reveal that by using this approach a great reduction of computation time of 3D video holograms could be achieved.
基金This work was supported by the Technology Innovation Program(No.20011317)Development of an adhesive material capable of morphing more than 50%for flexible devices with a radius of curvature of 1 mm or less funded by the Ministry of Trade,Industry&Energy(MOTIE,Korea).
文摘Phototransistors that can detect visible light have been fabricated using solution processed zinc oxide channel/zirconium oxide gate insulator thin film transistors(TFTs)and room temperature synthesized perovskite quantum dots(PeQDs)as active layer.Typical ZnO thin film transistors did not show a photocurrent under visible light illumination.However,ZnO TFTs decorated with PeQDs exhibited enhanced photocurrent upon exposure to visible light.The device had a responsivity of 567 A/W(617 A/W),a high detectivity of 6.59×10^(13)Jones(1.85×10^(14)J)and a high sensitivity of 10^(7)(10^(8))under green(blue)light at a low drain voltage of 0.1 V.The high photo-responsivity and detectivity under green light resulted from the combination of short ligands in the QDs films and the high mobility of the spray coated ZnO films.Those results are relevant for the development of low cost and low energy consumption phototransistors working in the visible range.
基金Prject supported by the National Natural Science Foundation of China(No.61076066)the Doctor Foundation of Shaanxi University of Science and Technology,China(No.BJ09-07)
文摘We report Al/MoO3 thin film used as a complex anode in high-performance OLEDs. The unique efficacy of the device was found to result from the enhanced injection of holes into the commonly used hole-transporting molecules due to a large reduction in the interface dipole at the anode/organic interface. The superior optical charac-teristics are attributed to a strong cavity effect, Due to the ease of processing Al/MoO3 we successfully demonstrated large-area flexible OLEDs on plastic substrates with uniform emission.
