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Efficient and stable hybrid perovskite-organic lightemitting diodes with external quantum efficiency exceeding 40 per cent

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Light(Science & Applications) 2024年第7期13卷 1364-1371页

作者： Lingmei Kong Yun Luo Qianqian Wu Xiangtian Xiao Yuanzhi Wang Guo chen Jianhua Zhang Kai Wang wallace chchoy Yong-Biao Zhao hongbo Li Takayuki chiba Junji Kido Xuyong Yang Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghai 200072China. Institute of Nanoscience and Applications Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhen 518055China. Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina. Department of Physics and Lakeside AR/VR Laboratory International Joint Research Center for Optoelectronic and Engineering ResearchYunnan UniversityKunming 650091China. Experimental center of Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China. Graduate School of Organic Materials Science Frontier Center for Organic MaterialsYamagata University4-3-16 JonanYonezawa 992–8510Japan

Light-emitting diodes(LEDs)based on perovskite semiconductor materials with tunable emission wavelength in visible light range as well as narrow linewidth are potential competitors among current light-emitting display technologies,but still suffer from severe instability driven by electric ***,we develop a stable,efficient and highcolor purity hybrid LED with a tandem structure by combining the perovskite LED and the commercial organic LED technologies to accelerate the practical application of *** LED and organic LED with close photoluminescence peak are selected to maximize photon emission without photon reabsorption and to achieve the narrowed emission *** designing an efficient interconnecting layer with p-type interface doping that provides good opto-electric coupling and reduces Joule heating,the resulting green emitting hybrid LED shows a narrow linewidth of around 30 nm,a peak luminance of over 176,000 cd m^(−2),a maximum external quantum efficiency of over 40%,and an operational half-lifetime of over 42,000 h.

关键词： diodes narrow quantum

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high-Performance Blue Quasi-2D Perovskite Light-Emitting Diodes via Balanced carrier confinement and Transfer

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Nano-Micro Letters 2022年第4期14卷 207-221页

作者： Zhenwei Ren Jiayun Sun Jiahao Yu Xiangtian Xiao Zhaojin Wang Ruijia Zhang Kai Wang Rui chen Yu chen wallace c.h.choy Department of Electrical and Electronic Engineering The University of Hong KongPokfulam RoadHong KongPeople’s Republic of China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China School of Optoelectronic Science and Engineering Soochow UniversitySuzhou 215006People’s Republic of China Guangdong-hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Shenzhen 518055People’s Republic of China

Extensive investigation of the passivating agents has been performed to suppress the perovskite ***,very few attentions have been paid to rationally design the passivating agents for the balance of the carrier confinement and transfer in quasi-2D perovskites,which is essential to achieve high-performance perovskite LEDs(PeLEDs).In this work,tributylphosphine oxide(TBPO)with moderate carbon chain length is demonstrated as a decent passivator for the quasi-2D perovskites by strengthening the carrier confinement for massive radiative recombination within the perovskites,and more importantly providing efficient carrier transfer in the quasi-2D *** from these interesting optoelectronic properties of TBPO-incorporated perovskites,we achieve high-efficient blue PeLEDs with an external quantum efficiency up to 11.5%and operational stability as long as 41.1 min without any shift of the electroluminescence ***,this work contributes an effective approach to promote the carrier confinement and transfer for high-performance and stable blue PeLEDs.

关键词： Blue perovskite LEDs carrier confinement and transfer Defect passivation 2-Dimentional

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Metallated conjugation in small-sized-molecular donors for solution-processed organic solar cells

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Science china chemistry 2015年第2期58卷 347-356页

作者： chaohua cui Yunye Zhang wallace c.h.choy hua Li Wai-Yeung Wong Institute of Molecular Functional Materials Department of Chemistry and Institute of Advanced Materials Hong Kong Baptist University Department of Electrical and Electronic Engineering The University of Hong Kong college of Life and Environmental Sciences & Beijing Engineering Research center of Food Environment and Public health Minzu University of China hKBU Institute of Research and continuing Education Shenzhen Virtual University Park

Four metallated conjugated oligothiophenes,S-1,S-2,S-3 and S-4,with platinum(II)aryleneethynylenes as the electron-rich building block were synthesized to investigate their physicochemical and photovoltaic *** small molecules possess fairly low-lying hOMO energy levels which match with the LUMO energy level of the electron acceptor Pc70BM([6,6]-phenyl-c71-butyric acid methyl ester).Using the simple process of spin-coating solution fabrication technique,S-1:Pc70BM(1:4,w/w)based organic solar cells exhibiting a high Voc of 0.913 V,with a PcE value of 0.88%were *** contrast,the OSc device based on S-2:Pc70BM(3:7,w/w)displayed a higher PcE of 1.59%with a higher Jsc value of 5.89m A cm–*** device based on S-4:Pc70BM(1:4,w/w)exhibited a PcE value of 1.56%,with a Voc of 0.917 V.

关键词：有机太阳能电池金属化小分子 hOMO能级电子受体 PcE 光电特性物理化学

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A Systematic Study for the Plasmonic Thin-film Solar cell with Periodic Structure

A Systematic Study for the Plasmonic Thin-film Solar Cell wi...

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全国第八届有机固体电子过程暨华人有机光电功能材料学术讨...

作者： wallace c.h.choy Department of Electrical and Electronic Engineering the University of Hong KongPokfulam RoadHong Kong

＜正＞A systematic study of the plasmonic thin-film solar cell with the periodic strip structure is presented in this paper. The finite-difference frequency-domain method is employed to discretize the inhomogeneous wave function for modeling the solar *** particular,the hybrid absorbing boundary condition and the one-sided difference scheme are *** parameter extraction methods for the zero-order reflectance and the absorbed power density are al-

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OLEDs with high Performance by using Semitransparent Metallic Multilayered Structures and Nanoparticles as the connecting Electrodes

OLEDs with High Performance by using Semitransparent Metalli...

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全国第八届有机固体电子过程暨华人有机光电功能材料学术讨...

作者： wallace c.h.choy Department of Electrical and Electronic Engineering University of Hong Kong

＜正＞Semitransparent metallic structures are very useful for OLED *** stacked OLEDs,the intermediate connection layer plays critical role in modifying the device *** the independently controllable stacked OLEDs,the i...

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Thermionic emission-based interconnecting layer featuring solvent resistance for monolithic tandem solar cells with solution-processed perovskites

Thermionic emission-based interconnecting layer featuring so...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： wallace c.h.choy can Li Zishuai Wang Department of Electrical and Electronic Engineering The University of Hong Kong

All-perovskite tandem cell has been considered as the potential candidate for bringing the power conversion efficiency(PcE) beyond the Shockley-Queisser limit of single-junction device and yet retaining the advantages of earth-abundant materials and solution processability. however, a challenging issue of realizing such solution-processed devices is the fulfillment of complex and coupled requirements of the interconnecting layer(IcL) including solvent-resistance to protect underlying perovskite film, high electrical properties for carrier transport and recombination, and high optical transmission. In this work, a new thermionic emission-based IcL with enhanced solvent-resistance feature is demonstrated. Fundamentally, the thermionic emission plays a critical role in the electron transport process in the IcL, which is confirmed through both experimental and theoretical studies. Besides achieving high optical transmission and electrical properties, the new IcL chemically protects the underlying perovskite film by introducing a fluoride silane incorporated polyethylenimine ethoxylated(FSIP) hybrid system which also passivates the surface defects to reduce electrical loss. Our monolithic all-perovskite tandem cells demonstrate highest PcE of 17.9% [1]. consequently, this work contributes to not only understanding the fundamental mechanism of IcL but also to promoting robust and low-cost photovoltaics.

关键词： Perovskite Tandem solar cells Interconnecting layer

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high Quality Narrow-bandgap Perovskites for Efficient and Stable Photovoltaics

High Quality Narrow-bandgap Perovskites for Efficient and St...

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第八届新型太阳能材料科学与技术学术研讨会

作者： wallace c.h.choy hui Liu can Li Lu Zhu Department of Electrical and Electronic Engineering The University of Hong Kong

Solution-processed narrow-bandgap Sn-Pb perovskites have shown their potentials in photovoltaics and near infrared (NIR) photodetection as a promising alternative of traditional silicon and inorganic compounds. To achieve efficient devices, high-quality Sn-Pb perovskite thick films with well-packed, smooth, pinhole/void-free features are highly desirable for boosting the spectral absorption. Understanding the crystallization kinetics and tuning the crystallization are fundamentally important to reach such high-quality thick Sn-Pb perovskite films, and have been limitedly explored. herein,

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A novel saliva-based miRNA profile to diagnose and predict oral cancer

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International Journal of Oral Science 2024年第1期16卷 97-109页

作者： Jaikrishna Balakittnen chameera Ekanayake Weeramange Daniel F.wallace Pascal h.G.Duijf Alexandre S.cristino Gunter hartel Roberto A.Barrero Touraj Taheri Liz Kenny Sarju Vasani Martin Batstone Omar Breik chamindie Punyadeera Saliva&Liquid Biopsy Translational Laboratory Griffith Institute for Drug DiscoveryGriffith UniversityNathanQLDAustralia Department of Medical Laboratory Sciences Faculty of Allied Health SciencesUniversity of JaffnaJaffnaSri Lanka Menzies health Institute Griffith UniversityGold CoastQLDAustralia School of Biomedical Sciences Faculty of HealthQueensland University of TechnologyBrisbaneQLDAustralia centre for cancer Biology Clinical and Health SciencesUniversity of South Australia&SA PathologyAdelaideSAAustralia Institute of clinical Medicine Faculty of MedicineUniversity of OsloOsloNorway Department of Medical Genetics Oslo University HospitalOsloNorway Griffith Institute for Drug Discovery Griffith UniversityNathanQLDAustralia QIMR Berghofer Medical Research Institute Statistics UnitBrisbaneQLDAustralia School of Public health The University of QueenslandBrisbaneQLDAustralia School of Nursing Queensland University of TechnologyBrisbaneQLDAustralia eResearch Research InfrastructureAcademic DivisionQueensland University of TechnologyBrisbaneQLDAustralia Department of Anatomical Pathology Royal Brisbane and Women’s HospitalHerstonQLDAustralia Faculty of Medicine The University of QueenslandBrisbaneQLDAustralia Royal Brisbane and Women’s hospital Cancer Care ServicesHerstonQLDAustralia Department of Otolaryngology Royal Brisbane and Women’s HospitalHerstonQLDAustralia Department of Oral and Maxillofacial Surgery Royal Brisbane and Women’s HospitalHerstonQLDAustralia

Oral cancer (Oc) is the most common form of head and neck cancer. Despite the high incidence and unfavourable patient outcomes, currently, there are no biomarkers for the early detection of Oc. This study aims to discover, develop, and validate a novel saliva-based microRNA signature for early diagnosis and prediction of Oc risk in oral potentially malignant disorders (OPMD).The cancer Genome Atlas (TcGA) miRNA sequencing data and small RNA sequencing data of saliva samples were used to discover differentially expressed miRNAs. Identified miRNAs were validated in saliva samples of Oc (n=50), OPMD (n=52), and controls(n=60) using quantitative real-time PcR. Eight differentially expressed miRNAs (miR-7-5p, miR-10b-5p, miR-182-5p, miR-215-5p,miR-431-5p, miR-486-3p, miR-3614-5p, and miR-4707-3p) were identified in the discovery phase and were validated. The efficiency of our eight-miRNA signature to discriminate Oc and controls was:area under curve (AUc):0.954, sensitivity:86%, specificity:90%,positive predictive value (PPV):87.8%and negative predictive value (NPV):88.5%whereas between Oc and OPMD was:AUc:0.911,sensitivity:90%, specificity:82.7%, PPV:74.2%and NPV:89.6%. We have developed a risk probability score to predict the presence or risk of Oc in OPMD patients. We established a salivary miRNA signature that can aid in diagnosing and predicting Oc,revolutionising the management of patients with OPMD. Together, our results shed new light on the management of Oc by salivary miRNAs to the clinical utility of using miRNAs derived from saliva samples.

关键词： specificity salivary diagnosis

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Recent progress of interconnecting layer for tandem organic solar cells

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Science china chemistry 2017年第4期60卷 460-471页

作者： Shunmian Lu Dan Ouyang wallace c.h. choy Department of Electrical and Electronic Engineering The University of Hong Kong Pok Fu Lam Road Hong Kong China

This paper has reviewed:(1) the two unique advantages of tandem organic solar cells(OScs) compared to single OScs;(2) the challengings as well as strategies to develop qualified interconnecting layer(IcL) for tandem *** specifically,firstly,the two key advantages unique to tandem OScs as compared to single OScs,namely minimizing sub-bandgap transmission and thermalization loss as well as realizing optical thick and electrical thin structures,have been ***,the IcL,as one of the most challenging issue in tandem OScs that needs to fulfill the optical,electrical and mechanical requirements simultaneously to realize a qualified IcL has been *** one of the most challenging requirement among the three,the electrical requirement and its corresponding three different solving strategies have been discussed in detail,revealing a bright future for developing a general strategy to realizing qualified IcL composed of different hole transporting layer(hTL) and electron transporting layer(ETL).

关键词：有机太阳能电池串联互连电子传输层空穴传输层 IcL 性能要求挑战性

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Transition metal oxides as hole-transporting materials in organic semiconductor and hybrid perovskite based solar cells

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Science china chemistry 2017年第4期60卷 472-489页

作者： Pingli Qin Qin he Dan Ouyang Guojia Fang wallace c.h. choy Gang Li Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Hum Kowloon Hong Kong SAR China School of Science Wuhan Institute of Technology Wuhan 430073 China college of Post and Telecommunications Wuhan Institute of Technology Wuhan 430073 China Key Laboratory of Artificial Micro- and Nano-struetures of the Ministry of Education School of Physics and Technology Wuhan University Wuhan 430072 China Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong SAR China

Organic polymer solar cells(OScs) and organic-inorganic hybrid perovskite solar cells(PScs) have achieved notable progress over the past several years.A central topic in these fields is exploring electronically efficient,stable and effective hole-transporting layer(hTL) *** goal is to enhance hole-collection ability,reduce charge recombination,increase built-in voltage,and hence improve the performance as well as the device *** metal oxides(TMOs) semiconductors such as NiO_x,cuO_x,crO_x,MoO_x,WO_3,and V_2O_5,have been widely used as hTLs in *** TMOs are naturally adopted into PSc as hTLs and shows their *** are similarities,and also differences in applying TMOs in these two types of main solution processed solar *** concise review is on the recent developments of transition metal oxide hTL in OScs and *** paper starts from the discussion of the cation valence and electronic structure of the transition metal oxide materials,followed by analyzing the structure-property relationships of these hTLs,which we attempt to give a systematic introduction about the influences of their cation valence,electronic structure,work function and film property on device performance.

关键词：过渡金属氧化物空穴传输材料太阳能电池钙钛矿型有机半导体价电子结构金属氧化物半导体有机-无机杂化

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