Micro-light-emitting diodes(micro-LEDs)have emerged as a promising display technology featuring high resolution,wide color gamut,high contrast,flexibility,and long lifetime.However,there are severe challenges in full-...Micro-light-emitting diodes(micro-LEDs)have emerged as a promising display technology featuring high resolution,wide color gamut,high contrast,flexibility,and long lifetime.However,there are severe challenges in full-color micro-LED,such as low efficiencies of red and green micro-LEDs,complex driving circuits for three-color micro-LEDs,and challenging mass transfer.Thus,converting blue light into red and green light by coupling color converters with blue LEDs is a reasonable strategy.Colloidal quantum dots(QDs)are an optimal candidate for color converters due to their high photoluminescence quantum yield,narrow emission peaks,small particle sizes,and solution processibility.Therefore,fullcolor micro-LEDs based on quantum dot color converters are attracting increasing attention.This review introduces micro-LED technology and the research progress of the full-color realization,and describes the associated technical challenges.Furthermore,it outlines the properties of QDs,patterning techniques,integration with micro-LEDs for achieving full color,and finally analyzes the challenges of applying QDs to micro-LEDs,demonstrating the application potential of QDs in achieving full-color of micro-LEDs,along with prospects for addressing current challenges.展开更多
Conventional bioelectrical sensors and systems integrate multiple power harvesting,signal amplification and data transmission components for wireless biological signal detection.This paper reports the real-time biophy...Conventional bioelectrical sensors and systems integrate multiple power harvesting,signal amplification and data transmission components for wireless biological signal detection.This paper reports the real-time biophysical and biochemical activities can be optically captured using a microscale light-emitting diode(micro-LED),eliminating the need for complicated sensing circuit.Such a thin-film diode based device simultaneously absorbs and emits photons,enabling wireless power harvesting and signal transmission.Additionally,owing to its strong photon-recycling effects,the micro-LED^photoluminescence(PL)emission exhibits a superlinear dependence on the external conductance.Taking advantage of these unique mechanisms,instantaneous biophysical signals including galvanic skin response,pressure and temperature,and biochemical signals like ascorbic acid concentration,can be optically monitored,and it demonstrates that such an optoelectronic sensing technique outperforms a traditional tethered,electrically based sensing circuit,in terms of its footprint,accuracy and sensitivity.This presented optoelectronic sensing approach could establish promising routes to advanced biological sensors.展开更多
Computer vision techniques are real-time,immersive,and perceptual human-computer interaction technology.Excellent display effect,dynamic surface flexibility,and safe bio-adhesion are essential for various human–compu...Computer vision techniques are real-time,immersive,and perceptual human-computer interaction technology.Excellent display effect,dynamic surface flexibility,and safe bio-adhesion are essential for various human–computer interaction applications,such as metaverse interfaces,skin-like sensors,and optoelectronic medical devices.However,realizing the flexible matching of inorganic optoelectronic devices and organisms remains a grand challenge for current display technologies.Here,we proposed a novel strategy by combining the optoelectronic advantages of inorganic micro light emitting diode(micro-LED)display and the extraordinary mechanical/biological compatibility of organic materials to overcome this challenge.A highly elastic(greater than 2000%strain),highly transparent(94%visible light transmittance),biocompatible conductive hydrogel composite electrode layer was fabricated.For the first time,we realized the on-chip electrical interconnection of 4900 LED units to form a blue-green light display patch with high resolution(264 PPI),low power consumption(4.4 mW)and adaptive surface attachment.This work demonstrates an integrated scheme and potential applications of flexible high-resolution microdisplays,such as wearable fullcolor micro-LED smart curved display devices and conformable biomedical monitoring systems.展开更多
In this work,we present the investigation of the quantum dot color filter(QDCF)micro-light emitting diode(micro-LED)display.Green and red quantum dot photoresist(QDPR)materials are patterned into a pixelated array and...In this work,we present the investigation of the quantum dot color filter(QDCF)micro-light emitting diode(micro-LED)display.Green and red quantum dot photoresist(QDPR)materials are patterned into a pixelated array and precisely bonded with an all-blue micro-light emitting diode(micro-LED)substrate,forming a red,green,and blue(RGB)full color display through color conversion.A few factors that influence the achievable color gamut are further investigated.The resulting 1.1-inch 228-pixels per inch(ppi)display demo shows the good performance.The findings in this paper pave a way to the future industrialization of the micro-LED display.展开更多
Confronted by the inherent physical limitations in scaling down Si technology,transition metal dichalcogenides(TMDCs)as alternatives are being tremendously researched and paid attention to.However,mature counter dopin...Confronted by the inherent physical limitations in scaling down Si technology,transition metal dichalcogenides(TMDCs)as alternatives are being tremendously researched and paid attention to.However,mature counter doping technology for TMDCs is still elusive,and thus,a controllable and reversible charge enhancer is adopted for acceptor(or donor)-like doping via octadecyltrichlorosilane(ODTS)(or poly-L-lysine(PLL))treatment.Furthermore,multiple counter doping for TMDC field-effect transistors(FETs),combined with a threshold voltage(V;h)freezing scheme,renders the V_(th) modulation controllable,with negligible degradation and decent sustainability of FETs even after each treatment of a representative charge enhancer.In parallel,the counter doping mechanism is systematically investigated via photoluminescence spectroscopy,X-ray photoelectron spectroscopy,atomic force microscopy(AFM),surface energy characterization,and measurement of optoelectronic properties under illumination with light of various wavelengths.More impressively,complementary inverters,composed of type-converted molybdenum ditelluride(MoTe_(2)>FETs and hetero-TMDC FETs in enhancement mode,are demonstrated via respective ODTS/PLL treatments.Herein,driving backplane application for micro-light-emitting diode(p-LED)displays and physical validation of a corresponding counter doping scheme even for flexible polyethylene terephthalate(PET)substrates could be leveraged to relieve daunting challenges in the application of nanoscale Si-based three-dimensional(3D)stacked systems,with potential adoption of ultralow power and monolithic optical interconnection technology.展开更多
基金supported by the National Key R&D Program of China(No.2021YFA0715502)the National Natural Science Foundation of China(No.62475084).
文摘Micro-light-emitting diodes(micro-LEDs)have emerged as a promising display technology featuring high resolution,wide color gamut,high contrast,flexibility,and long lifetime.However,there are severe challenges in full-color micro-LED,such as low efficiencies of red and green micro-LEDs,complex driving circuits for three-color micro-LEDs,and challenging mass transfer.Thus,converting blue light into red and green light by coupling color converters with blue LEDs is a reasonable strategy.Colloidal quantum dots(QDs)are an optimal candidate for color converters due to their high photoluminescence quantum yield,narrow emission peaks,small particle sizes,and solution processibility.Therefore,fullcolor micro-LEDs based on quantum dot color converters are attracting increasing attention.This review introduces micro-LED technology and the research progress of the full-color realization,and describes the associated technical challenges.Furthermore,it outlines the properties of QDs,patterning techniques,integration with micro-LEDs for achieving full color,and finally analyzes the challenges of applying QDs to micro-LEDs,demonstrating the application potential of QDs in achieving full-color of micro-LEDs,along with prospects for addressing current challenges.
基金the National Natural Science Foundation of China(NSFC)(No.61874064)Beijing Institute of Technology Research Fund Program for Young Scholars+2 种基金Beijing Innovation Center for Future Chips,Tsinghua UniversityBeijing National Research Center for Information Science and Technology(No.BNR2019ZS01005)supported by Beijing Institute of Technology Analysis&Testing Center.
文摘Conventional bioelectrical sensors and systems integrate multiple power harvesting,signal amplification and data transmission components for wireless biological signal detection.This paper reports the real-time biophysical and biochemical activities can be optically captured using a microscale light-emitting diode(micro-LED),eliminating the need for complicated sensing circuit.Such a thin-film diode based device simultaneously absorbs and emits photons,enabling wireless power harvesting and signal transmission.Additionally,owing to its strong photon-recycling effects,the micro-LED^photoluminescence(PL)emission exhibits a superlinear dependence on the external conductance.Taking advantage of these unique mechanisms,instantaneous biophysical signals including galvanic skin response,pressure and temperature,and biochemical signals like ascorbic acid concentration,can be optically monitored,and it demonstrates that such an optoelectronic sensing technique outperforms a traditional tethered,electrically based sensing circuit,in terms of its footprint,accuracy and sensitivity.This presented optoelectronic sensing approach could establish promising routes to advanced biological sensors.
基金The authors thank for the support from the National Natural Science Foundation of China(Nos.52173298,61904012,and 52192611)the National Key R&D Program of China(No.2021YFA1201603)the Fundamental Research Funds for the Central Universities.
文摘Computer vision techniques are real-time,immersive,and perceptual human-computer interaction technology.Excellent display effect,dynamic surface flexibility,and safe bio-adhesion are essential for various human–computer interaction applications,such as metaverse interfaces,skin-like sensors,and optoelectronic medical devices.However,realizing the flexible matching of inorganic optoelectronic devices and organisms remains a grand challenge for current display technologies.Here,we proposed a novel strategy by combining the optoelectronic advantages of inorganic micro light emitting diode(micro-LED)display and the extraordinary mechanical/biological compatibility of organic materials to overcome this challenge.A highly elastic(greater than 2000%strain),highly transparent(94%visible light transmittance),biocompatible conductive hydrogel composite electrode layer was fabricated.For the first time,we realized the on-chip electrical interconnection of 4900 LED units to form a blue-green light display patch with high resolution(264 PPI),low power consumption(4.4 mW)and adaptive surface attachment.This work demonstrates an integrated scheme and potential applications of flexible high-resolution microdisplays,such as wearable fullcolor micro-LED smart curved display devices and conformable biomedical monitoring systems.
基金This work was supported by Sichuan Science and Technology Program(Grant No.2023YFH0089).
文摘In this work,we present the investigation of the quantum dot color filter(QDCF)micro-light emitting diode(micro-LED)display.Green and red quantum dot photoresist(QDPR)materials are patterned into a pixelated array and precisely bonded with an all-blue micro-light emitting diode(micro-LED)substrate,forming a red,green,and blue(RGB)full color display through color conversion.A few factors that influence the achievable color gamut are further investigated.The resulting 1.1-inch 228-pixels per inch(ppi)display demo shows the good performance.The findings in this paper pave a way to the future industrialization of the micro-LED display.
基金supported by the Priority Research Centers Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(No.NRF-2020R1A6A1A03041954)+2 种基金partly supported by(i)the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(No.NRF-2019R1F1A1062767)and by(ii)the National Research Foundation of Korea(NRF)funded by the Ministry of Science,ICT and Future Planning(No.NRF-2021R1A2C1012593).
文摘Confronted by the inherent physical limitations in scaling down Si technology,transition metal dichalcogenides(TMDCs)as alternatives are being tremendously researched and paid attention to.However,mature counter doping technology for TMDCs is still elusive,and thus,a controllable and reversible charge enhancer is adopted for acceptor(or donor)-like doping via octadecyltrichlorosilane(ODTS)(or poly-L-lysine(PLL))treatment.Furthermore,multiple counter doping for TMDC field-effect transistors(FETs),combined with a threshold voltage(V;h)freezing scheme,renders the V_(th) modulation controllable,with negligible degradation and decent sustainability of FETs even after each treatment of a representative charge enhancer.In parallel,the counter doping mechanism is systematically investigated via photoluminescence spectroscopy,X-ray photoelectron spectroscopy,atomic force microscopy(AFM),surface energy characterization,and measurement of optoelectronic properties under illumination with light of various wavelengths.More impressively,complementary inverters,composed of type-converted molybdenum ditelluride(MoTe_(2)>FETs and hetero-TMDC FETs in enhancement mode,are demonstrated via respective ODTS/PLL treatments.Herein,driving backplane application for micro-light-emitting diode(p-LED)displays and physical validation of a corresponding counter doping scheme even for flexible polyethylene terephthalate(PET)substrates could be leveraged to relieve daunting challenges in the application of nanoscale Si-based three-dimensional(3D)stacked systems,with potential adoption of ultralow power and monolithic optical interconnection technology.
