Review
Chemistry, Multidisciplinary
Bas Van der Zee, Yungui Li, Gert-Jan A. H. Wetzelaer, Paul W. M. Blom
Summary: The various contributions to the external quantum efficiency (EQE) of polymer light-emitting diodes (PLEDs) are discussed. It is found that the inclusion of triplet-triplet annihilation (TTA) contributes significantly to the enhancement of EQE in PLEDs.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Yifan Yao, Yusheng Chen, Kuidong Wang, Nicholas Turetta, Stefania Vitale, Bin Han, Hanlin Wang, Lei Zhang, Paolo Samori
Summary: A foldable inverted polymer light-emitting diode (iPLED) based on a self-suspended asymmetrical vertical nanoscaffold is reported, exhibiting excellent mechanical robustness and high brightness. Arbitrary emitting patterns can be generated using photolithography and brush painting, with individual pixel resolution of 10 μm. The iPLED can be supported on flexible polyimide foils and recycled by washing and refilling with different conjugated polymers capable of emitting light of different color.
Article
Chemistry, Physical
Atefeh Ghorbani, Junfei Chen, Fatemeh Samaeifar, Mohsen Azadinia, Peter Chun, Quan Lyu, Giovanni Cotella, Hany Aziz
Summary: In this study, a robust thermally cross-linked polymer, VB-FNPD, was investigated as a hole transport layer (HTL) for Cd-based quantum-dot light-emitting devices (QDLEDs). The results showed that using VB-FNPD instead of the commonly used TFB increased the electroluminescence half-life (LT50) of the devices and improved the morphology of the HTL/QD interface and QD film uniformity. Furthermore, VB-FNPD exhibited better stability under hole current flow and reduced charge accumulation in the devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Multidisciplinary Sciences
Kosuke Yasuji, Tomo Sakanoue, Fumihiro Yonekawa, Katsuichi Kanemoto
Summary: The recombination between electrons and holes in electroluminescence processes has never been directly evaluated. In this study, the operation dynamics of light-emitting electrochemical cells were visualized with spectroscopic techniques, leading to a rapid device evaluation.
NATURE COMMUNICATIONS
(2023)
Review
Materials Science, Multidisciplinary
Dan-Dan Zhang, Jian-Long Xu, Hong-Bo Sun
Summary: The rapid development of nanotechnology has facilitated the widespread application of functional nanoparticles in optoelectronic devices, particularly in organic light-emitting diodes, addressing challenges related to higher device efficiency. The use of nanoparticles with designed structure and functionality has shown great application potentials in OLEDs, enhancing carrier injection abilities, local surface plasmonic resonance, light scattering, and magnetic field effects. One-component and multicomponent heterostructured nanoparticles with multifunctional capabilities in OLEDs have been overviewed, offering promising future research directions for highly efficient OLEDs.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Apurba Adhikary, Joy Bhuiya, Saydul Akbar Murad, Md. Bipul Hossain, K. M. Aslam Uddin, M. D. Estihad Faysal, Abidur Rahaman, Anupam Kumar Bairagi
Summary: This study proposes a method to improve the light intensity and efficiency of white OLEDs by engraving MLAs on the substrate layer. The incorporation of Convex-1 MLA significantly increases the EQE and peak EL intensity of the OLEDs, making it a potential candidate for white OLED applications.
Article
Physics, Applied
Mei Cui, Chenyu Guo, Zhenhai Yang, Li Chen, Yijun Dai, Houqiang Xu, Wei Guo, Jichun Ye
Summary: This paper investigates the application of conductive dielectric distributed Bragg reflectors (DBRs) in GaN-based light emitters. A conductive DBR was fabricated using the electrical breakdown technique. The optical simulations and electrical tests demonstrated its excellent performance. The conductive mechanisms were elaborated by comparing different metal electrodes. Ultimately, a conductive DBR with high reflectivity was successfully prepared.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Rachith Shanivarasanthe Nithyananda Kumar, Maarten Eerdekens, Yovan de Coene, Veda Sandeep Nagaraja, Shabnam Ahadzadeh, Melissa Van Landeghem, Thierry Verbiest, Wim Deferme
Summary: The spatial and surface coverage dependence of plasmonic gold nanoparticles is controlled by a roll-to-roll compatible ultrasonic spray coating technique, resulting in enhanced fluorescence and charge transport in organic light emitting diodes. Two-photon fluorescence microscopy shows a 2-fold enhancement in multi-photon fluorescence for gold nanoparticles stabilized by polystyrene sulfonate (PSS) located 10 nm away from the super yellow fluorophore. Fluorescence enhancement, combined with approximately 2% surface coverage of PNPs, leads to a 33%, 20%, and approximately 40% increase in electroluminescence, luminous efficacy, and external quantum efficiency, respectively.
NANOSCALE ADVANCES
(2023)
Review
Optics
Runnan Yu, Changxiao Li, Biao Zhao, Zhan'ao Tan
Summary: This work reviews the research history of green perovskite light-emitting diodes (GPeLEDs), introduces perovskites of different dimensions, and discusses the common synthesis methods of perovskites. Additionally, strategies to improve the stability and luminous efficiency of GPeLEDs are summarized, including component engineering, phase engineering, ligand engineering, additive engineering, interface engineering, and optical coupling structure strategy. Finally, the development state of GPeLEDs is summarized and future prospects are discussed.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Meng Tian, Huabin Yu, Muhammad Hunain Memon, Zhanyong Xing, Chen Huang, Hongfeng Jia, Haochen Zhang, Danhao Wang, Shi Fang, Haiding Sun
Summary: Micro-LEDs with smaller inclined chip sidewall angles exhibit improved external quantum efficiency due to stronger reflection of the inclined sidewall, leading to enhanced light extraction efficiency. The EQE improvement by adopting an inclined sidewall is more significant as the diameter of the LED chip reduces. Numerical optical modeling further verifies the impact of sidewall angles on the light extraction efficiency of micro-LEDs.
Article
Chemistry, Physical
Xinyu Shen, Hua Wu, Xiaoyu Zhang, Meili Xu, Junhua Hu, Jinyang Zhu, Bin Dong, William W. Yu, Xue Bai
Summary: The all-solution process for inorganic perovskite nanocrystals (PNCs) LEDs shows great potential for new-generation illumination and displays, but the challenge lies in the injection barriers and charge injection imbalance. The introduction of CBP into the hole transport layer (HTL) efficiently modulates the charge carrier mobility and energy level, resulting in barrier-free charge injection and optimal performance for solution-processed PNC LEDs. The luminance of red LEDs reaches 2990 cd m(-2) and the external quantum efficiency achieves 8.1%, with improved turn-on voltage and roll-off due to more balanced charge injection.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Applied
M. L. Ligi, A. Abhilash, Sreekanth J. Varma, P. A. Unnikrishnan, S. Prathapan, S. Jayalekshmi
Summary: Two novel segmented block copolymers, NPPV1 and NPPV2, were synthesized and characterized for their substituent effects on properties, structure-property relationships, and suitability for polymer light emitting diodes. The study highlighted the importance of cost-effective synthesis methods in developing polymers for efficient LED design in high frequency blue emission.
Article
Chemistry, Multidisciplinary
Chungen Hsu, Shun Tian, Yaxiao Lian, Guoling Zhang, Qian Zhou, Xuhui Cao, Baodan Zhao, Dawei Di
Summary: The study demonstrates an efficient single-pixel PeLED technology with high external quantum efficiency. By using a nanometer-thin lithium fluoride interlayer and preparing uniform and highly luminescent perovskite layers, successful manufacturing and integration of microPeLEDs are achieved.
CELL REPORTS PHYSICAL SCIENCE
(2021)
Review
Chemistry, Multidisciplinary
Dexin Yang, Baodan Zhao, Tao Yang, Runchen Lai, Dongchen Lan, Richard H. Friend, Dawei Di
Summary: Metal halide perovskites, a promising class of materials for display and lighting applications, have seen a rapid increase in device efficiencies. However, challenges remain in achieving high operational stability and efficient blue emission. Interdisciplinary research involving materials scientists, chemists, and physicists is crucial for realizing operationally stable PeLEDs.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Hakjun Lee, Hyewon Nam, Hyo-Jin Yeo, Heesun Yang, Taekyung Kim
Summary: By utilizing the localized surface plasmon resonance (LSPR) effect, the theoretical efficiency limit of fluorescence organic light-emitting diodes (OLEDs) was surpassed, and the interaction between polaritons and plexcitons during the LSPR process was experimentally analyzed. The external quantum efficiency (EQE) significantly increased from 6.01% to 15.43%, exceeding the theoretical efficiency limit of fluorescent OLEDs. A new concept of LSPR sensitizer was introduced, allowing for simultaneous improvement in color conversion and efficiency through cascade transfer of the LSPR effect. To date, our LSPR-OLED has achieved the highest EQE and current efficiency among LSPR-based fluorescent OLEDs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Qinglei Zhang, Yi Feng, Jingtao Hu, Xiaojun Su, Hailong Wang, Jiaxin Zheng, Shicheng Xiong, Yucheng Xu, Nianqiang Jiang, Linlin Liu, Zengqi Xie
Summary: A narrowband-absorption BODIPY dye was synthesized and applied in vertical-structural NBPDs, leading to improved responsivity and response speed. The introduction of a thin layer of Spiro-OMeTAD on the hump parts of mp-TiO2 induced electron injection and achieved high photomultiplication in NBPDs.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yi Feng, Jiadong Zhou, Honglin Qiu, Matthias Schnitzlein, Jingtao Hu, Linlin Liu, Frank Wuerthner, Zengqi Xie
Summary: In this study, a new starlike heterocyclic molecule, QNSA, was synthesized via a straightforward approach. QNSA exhibits intense fluorescence in dilute solution, with a quantum yield of up to 62%.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Physical
Hao Loong, Jiadong Zhou, Nianqiang Jiang, Yi Feng, Guojing Xie, Linlin Liu, Zengqi Xie
Summary: We synthesized perylene bisimide-based triads with different distances between donor and acceptor to study their influence on excited state electron processes. Different charge transfer lifetimes were observed in dichloromethane for these triads. Through calculation of charge transfer free-energy changes, it was found that cascading charge transfer processes play an important role in tuning charge transfer lifetime in multichromophoric systems.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Multidisciplinary Sciences
Chengliang He, Zeng Chen, Tonghui Wang, Ziqiu Shen, Yaokai Li, Jiadong Zhou, Jianwei Yu, Huiyu Fang, Yuhao Li, Shuixing Li, Xinhui Lu, Wei Ma, Feng Gao, Zengqi Xie, Veaceslav Coropceanu, Haiming Zhu, Jean-Luc Bredas, Lijian Zuo, Hongzheng Chen
Summary: Efficient organic solar cells with high luminescence and charge collection are achieved by blending an asymmetric non-fullerene acceptor BO-5Cl with PM6 donor, resulting in a record-high electroluminescence external quantum efficiency of 0.1% and a power conversion efficiency of over 15%. Incorporating BO-5Cl as the third component in a widely-studied PM6:BO-4Cl blend further enhances the certified power conversion efficiency to 18.2%.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Mei Luo, Yinchu Chen, Jiahao Liang, Jiadong Zhou, Dong Yuan, Zesheng Zhang, Xuanchen Liu, Lianjie Zhang, Zengqi Xie, Junwu Chen
Summary: In this study, the facile preparation and separation of three mono-brominated isomers were demonstrated, revealing their impact on the optoelectronic properties. The single-crystal structure of a symmetric molecule was also successfully achieved. These findings contribute to the understanding of the structure-property relationship.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Yanrui Lin, Xuehong Zhou, Xuehua Hou, Zengqi Xie, Linlin Liu
Summary: In this study, complete maps of electroluminescent, photoluminescent, and Raman scattering in an organic light-emitting diode during its operation were achieved using a confocal spectrometer with multiple laser sources. The different spectral characters helped to identify different regions and suggest degradation mechanisms. This method has high spatial resolution and reproducibility, which is significant for online quality prediction and mechanistic analysis.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Hailong Wang, Qinglei Zhang, Jiadong Zhou, Xiaojun Su, Guojing Xie, Ningning Tang, Nan Zheng, Linlin Liu, Zengqi Xie
Summary: A series of donor-node-acceptor (D-n-A) polymers with linear conjugated backbone as donor and tetrachloronated perylene diimide (4Cl-PDI) pendant as acceptor have been synthesized for use as hole-transporting layers (HTLs) in perovskite photodetectors (PDs). The polymers exhibit excellent hole transporting properties due to the aggregation behavior of the conjugated backbone and easily trap free electrons due to the electron affinity of the 4Cl-PDI pendant. The presence of the 4Cl-PDI pendant in the polymers also suppresses the face-on orientation of the conjugated backbone, thus reducing dark current in the perovskite PDs. Based on these D-n-A type hole-transporting materials, durable perovskite PDs with high responsivity, detectivity, and fast response speed have been successfully demonstrated.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Physical
Xia Zhou, Shuting Pang, Baoqi Wu, Jiadong Zhou, Haoran Tang, Kaiwen Lin, Zengqi Xie, Chunhui Duan, Fei Huang, Yong Cao
Summary: Nonfused ring acceptors (NFRAs) have shown promise in achieving high-efficiency organic solar cells (OSCs). This study synthesized two A-D-A'-D-A-type NFRAs and investigated the influence of fluorination on molecular packing and photovoltaic performance. The results showed that fluorinated compounds exhibited more ordered and compact stacking, leading to higher power conversion efficiency in solar cells.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Organic
Oliver Nagler, Ana-Maria Krause, Kazutaka Shoyama, Matthias Stolte, Rajeev K. Dubey, Linlin Liu, Zengqi Xie, Frank Wuerthner
Summary: A new class of PBI derivatives has been introduced by linking 1,12- and 1,6,7,12-hydroxy functionalized bay positions with oxygen-carbon-oxygen linker(s), resulting in dyes with high stability, solubility, intense yellow emission, and quantum yields close to 100%.
Article
Chemistry, Multidisciplinary
Yixin Dong, Xiyue Dong, Di Lu, Mingqian Chen, Nan Zheng, Rui Wang, Qiaohui Li, Zengqi Xie, Yongsheng Liu
Summary: In this study, a new organic semiconductor spacer, BThDMA, was developed for 2D DJ perovskite solar cells. Compared to other spacers, BThDMA showed stronger orbital interactions and crystal growth ability, resulting in improved efficiency and stability of the cells.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Suinan Deng, Wenjun Luo, Lianjie Zhang, Guojing Xie, Shuyi Lei, Mei Luo, Zuhao Wu, Dong Yuan, Jiahao Liang, Zengqi Xie, Junwu Chen
Summary: Aromatic substituent engineering of side chains is crucial for molecular structure and properties. Through efficient regioselective acylation, the key aromatic substituted cores of simple nonfullerene acceptors were successfully realized. The synthesized acceptors, Ph-BDD and C4Ph-BDD, exhibited different aggregation and crystallinity due to the difference in the phenyl-substituted benzodithiophenedione core moiety. Ph-BDD with bare benzene rings showed a higher power conversion efficiency (PCE) of 13.64% compared to C4Ph-BDD (PCE of 11.37%). Both Ph-BDD and C4Ph-BDD-based devices retained 97% of their original efficiency after more than 60 days of air storage. This study highlights the importance of feasible regioselective acylation for the development of stable and high-performing nonfullerene solar cells.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Multidisciplinary Sciences
Ningning Tang, Jiadong Zhou, Liangxuan Wang, Matthias Stolte, Guojing Xie, Xinbo Wen, Linlin Liu, Frank Wuethner, Johannes Gierschner, Zengqi Xie
Summary: Nano-sized PBI dyes achieve deep-red emission and avoid common quenching pathways by tuning the dihedral angle between the aromatic and alkoxy groups.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Zhiqiang Wang, Wenkui Wei, Liang Zeng, Tao Liu, Xiyue Yuan, Jiadong Zhou, Bingyan Yin, Junyu Li, Zengqi Xie, Fei Huang, Yong Cao, Chunhui Duan
Summary: This study reports the synthesis and application research of three A-DA & PRIME;D-A-type pentacyclic fullerene electron acceptors. Compared with the prevailing heptacyclic fullerene electron acceptors, these pentacyclic fullerene acceptors have lower synthetic complexity. Among them, the acceptor BTPT4F-BO exhibits a high power conversion efficiency of 15.0% in organic solar cells, with low synthetic complexity.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Zhibin Feng, Jiadong Zhou, Xiandong He, Bohan Wang, Guojing Xie, Xianfeng Qiao, Linlin Liu, Zengqi Xie, Yuguang Ma
Summary: Researchers have successfully developed two diradicals with super stability by increasing conjugation and electron-withdrawing effects, which expands the potential applications of organic spintronic devices.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Organic
Oliver Nagler, Kazutaka Shoyama, Olga Anhalt, Matthias Stolte, Rajeev K. Dubey, Zengqi Xie, Frank Wuerthner
Summary: This study reports a synthetic strategy to tune the structural and fluorescence properties of PBI dyes by employing a bay-substitution pattern. By introducing boron, carbon, or silicon atoms at the 1,12-positions and further functionalization, novel perylene dyes with excellent optical properties have been successfully synthesized.
ORGANIC CHEMISTRY FRONTIERS
(2023)
