Article
Nanoscience & Nanotechnology
Mohsen Azadinia, Tyler Davidson-Hall, Dong Seob Chung, Atefeh Ghorbani, Fatemeh Samaeifar, Junfei Chen, Peter Chun, Quan Lyu, Giovanni Cotella, Hany Aziz
Summary: Using a wider band gap quantum dot layer as an interlayer can improve the performance of inverted quantum dot light-emitting devices with a polymeric hole transport layer, resulting in higher efficiency and longer lifetime.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Pengpeng Cheng, Zehan Liu, Ruyan Kang, Jian Zhou, Jia Zhao, Zhiyuan Zuo
Summary: This study successfully demonstrates the optimization of ETL-free PeLEDs using the all-solution method, providing an opportunity to fabricate high-performance perovskite-based photovoltaic devices under ambient conditions.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Fuzhi Wang, Zhenye Wang, Xiaodong Zhu, Yiming Bai, Yun Yang, Siqian Hu, Yuqing Liu, Baogui You, Jun Wang, Yang Li, Zhan'ao Tan
Summary: High performance and super stable all-inorganic full-color quantum dot light-emitting diodes are constructed using solution-processed Mg-doped NiOx nanoparticles as hole transport layer and Al-doped ZnO as electron transport layer. By optimizing energy levels through UVO treatment and Al-doping, more balanced charge injection is achieved, resulting in high luminance and efficiency.
Article
Nanoscience & Nanotechnology
Kumar Mallem, Maksym F. Prodanov, Chen Dezhang, Mikita Marus, Chengbin Kang, Sunil B. Shivarudraiah, Valeri V. Vashchenko, Jonathan E. Halpert, Abhishek K. Srivastava
Summary: Solution-processed semiconductor nanocrystals have potential for display and lighting applications due to their tunable emission, saturated colors, and compatibility with flexible substrates. This study successfully synthesized red, green, and blue quantum rods (QRs) and applied them in QR-based light-emitting diodes (QR-LEDs). By embedding a thin poly(methyl methacrylate) (PMMA) electron-blocking layer, charge injection balance and external quantum efficiency were improved. The efficiency roll-off of green and blue QR-LEDs at maximum current density was less than 50%.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Ji-Hun Yang, Gyeong-Pil Jang, Su-Young Kim, Young-Bin Chae, Kyoung-Ho Lee, Dae-Gyu Moon, Chang-Kyo Kim
Summary: This paper presents a study exploring the use of solution-processed MoOx nanoparticles as a hole injection layer in QLEDs, resulting in significant improvements in device performance. The results show that an 8 mg/mL concentration of MoOx nanoparticles achieves maximum luminance, current efficiency, and external quantum efficiency of 69,240.7 cd/cm(2), 56.0 cd/A, and 13.2% respectively. Compared to QLEDs without HIL and those with the commonly used PEDOT:PSS HIL, the MoOx nanoparticle configuration demonstrates notable enhancements in current efficiency and EQE. This study opens up new possibilities for the fabrication of solution-processed QLEDs.
Article
Materials Science, Multidisciplinary
Binbin Zhang, Jiali Li, Chaohuang Mai, Miaozi Li, Haihua Li, Wei Xu, Jian Wang
Summary: In this study, a silver-precursor ink converted cathode is introduced for all-solution processed quantum dots light-emitting diodes (QLEDs). By optimizing the annealing temperature of ZnO and the annealing condition of the silver-precursor ink, the challenges of silver ions permeating through ZnO and quenching the fluorescence of QDs have been overcome, leading to high efficiency QLEDs.
ORGANIC ELECTRONICS
(2021)
Review
Polymer Science
Takayuki Chiba
Summary: This paper outlines recent progress in various solution-processed OLEDs, including fluorescent polymer tandem OLEDs, white phosphorescent tandem OLEDs, and perovskite NC LEDs. Tandem OLEDs, with their high efficiencies and long operational lifetimes, have attracted considerable attention for display applications. Additionally, the modification of perovskite NC surfaces enhanced their optoelectrical properties and LED performance.
Article
Polymer Science
Praetip Khammultri, Wipaporn Kitisriworaphan, Pongsakorn Chasing, Supawadee Namuangruk, Taweesak Sudyoadsuk, Vinich Promarak
Summary: The study successfully designed and synthesized a series of high-performance white-light emissive TADF polymers, which can achieve emission from yellow to pure white light by adjusting the components, demonstrating excellent OLED display performance.
Article
Chemistry, Multidisciplinary
Kohei Nakao, Hisahiro Sasabe, Yusuke Shibuya, Amane Matsunaga, Hiroshi Katagiri, Junji Kido
Summary: In this study, a series of highly luminescent aluminum complexes with delayed fluorescence have been successfully developed, showing excellent performance in organic light-emitting devices. These results are expected to guide the advancement of next-generation solid-state lighting technology.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Review
Optics
Maria Vasilopoulou, Azhar Fakharuddin, F. Pelayo Garcia de Arquer, Dimitra G. Georgiadou, Hobeom Kim, Abd Rashid bin Mohd Yusoff, Feng Gao, Mohammad Khaja Nazeeruddin, Henk J. Bolink, Edward H. Sargent
Summary: Near-infrared light-emitting diodes fabricated by solution-processed means using organic semiconductors, halide perovskites, and colloidal quantum dots have become a promising technological platform for various applications including biomedical, night vision, surveillance, and optical communications. Despite achieving high external quantum efficiencies exceeding 20%, challenges remain in achieving high radiance, reducing efficiency roll-off, and extending operating lifetime. This review summarizes recent advances in emissive materials synthetic methods and device key attributes contributing to improved performance of the fabricated light-emitting devices.
Article
Materials Science, Multidisciplinary
Junfei Chen, Dandan Song, Suling Zhao, Bo Qiao, Weiye Zheng, Zheng Xu
Summary: This study introduces a synergistical double hole transport layer (D-HTLs) strategy to enhance the efficiency of blue quantum dot light-emitting diodes (QLEDs), achieving a maximum external quantum efficiency (EQE) of 13.7%. The optimization of surface morphology and charge injection balance contributes to the improvement of device performance.
ORGANIC ELECTRONICS
(2021)
Article
Chemistry, Physical
Shallu Dhingra, Iram Siddiqui, Santosh Prasad Gupta, Shahnawaz, Shahnawaz Jayachandran Jayakumar, Jwo-Huei Jou, Santanu Kumar Pal
Summary: In this study, a series of liquid crystals with perylene tetraesters as the core and a triazole moiety as the linker were investigated. The mesogens showed a stable enantiotropic columnar mesophase. The electroluminescent properties of these compounds were also studied, and a well-designed organic light emitting diode device with high performance was successfully fabricated using the selected emitters.
Article
Chemistry, Physical
Wenxuan Du, Chunyan Cheng, Jianjun Tian
Summary: Doping a strong Lewis acid into a Lewis base polymer to form an acid-base adduct hole-transport layer can improve the efficiency of InP-based QLEDs.
Article
Materials Science, Multidisciplinary
Xingyu Shi, Jianfeng Zhang, Lingmei Kong, Lin Wang, Yongjiang Dou, Sheng Wang, Wenqiang Li, Xiaoyu Zhang, Limin Yan, Xuyong Yang
Summary: The utilization of a mixture of chlorobenzene and dichloromethane as an orthogonal solvent to deposit upper layers on perovskite films resulted in smooth and dense films, leading to high-performance all-solution-processed PeLEDs.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Xiaoya Li, Dandan Song, Zhaojun Li, Suling Zhao, Bo Qiao, Zhiqin Liang, Zheng Xu
Summary: In solution-processed organic light-emitting devices (OLEDs), a polymer interface layer, such as Poly (9-vinylcarbazole) (PVK), significantly improves the device efficiency by reducing the hole current density, balancing the carrier distribution, improving film morphology, and enhancing the orientation of transition dipole moment. This work provides insights into the improved device performance in TADF OLEDs with a polymer interface layer and highlights its effect on the film formation of the solution-processed emission layer.
ORGANIC ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Jun-Jie Cao, Kai-Li Wang, Chong Dong, Xiao-Mei Li, Wen-Fan Yang, Zhao-Kui Wang
Summary: Utilizing TaCl5-doped SnO2 ETL can enhance open-circuit voltage and power conversion efficiency, leading to the fabrication of high-performance perovskite solar cells.
ORGANIC ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Katsuya Miyashige, Masahiro Morimoto, Shigeki Naka
Summary: The hole mobility of an organic semiconductor film changes with different film formation processes, with activation energies varying for vacuum-deposited film, slowly cooled-melted film, and rapidly cooled-melted film. This indicates that organic semiconductor thin films formed by different methods have different molecular aggregation states.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Dong Liang, Chong Dong, Lei Cai, Zhenhuang Su, Jiaqing Zang, Chenyue Wang, Xuechun Wang, Yatao Zou, Yajuan Li, Li Chen, Liujiang Zhang, Zhiwei Hong, Abdelhamid El-Shaer, Zhao-Kui Wang, Xingyu Gao, Baoquan Sun
Summary: GIWAXS was used to investigate the crystal orientation of quasi-2D perovskites during film fabrication process, revealing the impact of intermediate phases on crystalline growth and proposing a strategy of using simple additives to suppress their formation. This approach led to the successful fabrication of high-oriented quasi-2D perovskite solar cells with improved performance.
Article
Chemistry, Physical
Chun-Hao Chen, Yan-Hui Lou, Kai-Li Wang, Zhen-Huang Su, Chong Dong, Jing Chen, Yi-Ran Shi, Xing-Yu Gao, Zhao-Kui Wang
Summary: The two-step sequential deposition method incorporating cesium acetate and formamidinium methylammonium cesium as raw materials can improve the perovskite crystallization process, further enhancing the efficiency and quality of perovskite films.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Guixiang Li, Zhenhuang Su, Meng Li, Feng Yang, Mahmoud H. Aldamasy, Jorge Pascual, Fengjiu Yang, Hairui Liu, Weiwei Zuo, Diego Di Girolamo, Zafar Iqbal, Giuseppe Nasti, Andre Dallmann, Xingyu Gao, Zhaokui Wang, Michael Saliba, Antonio Abate
Summary: The use of n-butylammonium acetate (BAAc) to modulate tin coordination in the crystallization process results in more compact and preferentially oriented perovskite films. Perovskite solar cells processed with BAAc show higher power conversion efficiency and improved stability, paving the way for controlled tin-based perovskite crystallization in lead-free photovoltaics.
ADVANCED ENERGY MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
J. Chen, Z-K Wang, L-S Liao
Summary: This review introduces the representative and effective strategies of crystallization control and defect passivation of perovskite films, which have achieved positive results in promoting enhancement of device efficiency and stability. Furthermore, efforts on increasing the dimensional scale of the device and producing flexible devices, which have huge commercial potential, are also covered. As a result of these advanced investigations, the prospects of the commercialization of PSCs have rapidly increased.
MATERIALS TODAY NANO
(2021)
Article
Chemistry, Multidisciplinary
Shuai Yuan, Lin-Song Cui, Linjie Dai, Yun Liu, Qing-Wei Liu, Yu-Qi Sun, Florian Auras, Miguel Anaya, Xiaopeng Zheng, Edoardo Ruggeri, You-Jun Yu, Yang-Kun Qu, Mojtaba Abdi-Jalebi, Osman M. Bakr, Zhao-Kui Wang, Samuel D. Stranks, Neil C. Greenham, Liang-Sheng Liao, Richard H. Friend
Summary: The research demonstrates that using fluorene-based pi-conjugated cationic polymer blended with perovskite semiconductors can achieve efficient blue LEDs with good electroluminescence and spectral stability. The mixed halide perovskite LEDs exhibit CIE coordinates of (0.08, 0.22) and (0.12, 0.13), showcasing great potential for stable blue perovskite LEDs.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Ryota Sugimoto, Masahiro Morimoto, Shigeki Naka
Summary: The patterning of organic light-emitting diodes using blue laser irradiation was investigated. The study found that optional patterning was possible by quenching the laser irradiation part, offering a potential fabrication technique for on-demand pattern emission.
Article
Chemistry, Multidisciplinary
Masahiro Morimoto, Yuya Ozawa, Shigeki Naka, Hiroyuki Okada
Summary: Polymer light-emitting diodes (PLEDs) are commonly produced using the wet process, which is difficult for stacking multiple layers, but compatible with the lamination process for making multilayer tandem type devices. Tandem type PLEDs made of two transparent substrates using the lamination process exhibit additive color mixed emission, resulting in orange emission. By carefully selecting materials, similar emission is observed from both substrates of the semitransparent tandem PLEDs because the top layer does not absorb the emission from the bottom layer.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2021)
Article
Materials Science, Multidisciplinary
Mitsuyuki Shikano, Masahiro Morimoto, Shigeki Naka
Summary: This study focused on the optical properties of a low-molecular-weight boron-dipyrromethene derivative (BODIPY-Ph) and its potential application in NIR region, with an acetone solution showing high photoluminescence quantum yield and the OLED exhibiting a relatively high external quantum efficiency in the NIR region.
ORGANIC ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Seiichiro Izawa, Masahiro Morimoto, Shigeki Naka, Masahiro Hiramoto
Summary: A highly efficient OLED with low operating voltage and high quantum efficiency was achieved by utilizing upconversion (UC) transition and introducing special materials to reduce energy loss during the process.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Mohammad Mostafizur Rahman Biswas, Md Faruk Hossain, Masahiro Morimoto, Shigeki Naka, Hiroyuki Okada
Summary: Cd-free ZnCuInS/ZnS quantum dot-based light-emitting diodes (QLEDs) were fabricated using metallic sputtered ZnO as the substrate, with the oxide layer properties enhanced by substrate heating. The semiconductor properties of the ZnO layer were examined through Hall effect measurements and structural analyses. The QLED devices achieved high power efficiency, current efficiency, and external quantum efficiency under specific preparation conditions, demonstrating promising potential for practical applications.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2021)
Article
Materials Science, Multidisciplinary
Teppei Masuda, Masahiro Morimoto, Shigeki Naka
Summary: To reduce the driving voltage, further development of organic light-emitting diodes (OLEDs) is needed. Exciplex upconversion-type OLEDs (ExUC-OLEDs), which form exciplexes at the donor/acceptor interface, are an optimal solution. However, an unexplained phenomenon is observed in these devices that cannot be explained by simple exciton diffusion. In this study, an exciton capture layer is inserted into the emitter layer of ExUC-OLEDs to investigate the exciton diffusion mechanism. All ExUC-OLEDs emit light through triplet-triplet upconversion (TTU) and operate at more than half the applied voltage (1 V) of the emitter material's energy gap. Additionally, long-range exciton diffusion up to 40 nm is confirmed through TTU and singlet fission contributions.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Ryosuke Fukazawa, Yoshiki Maegawa, Masahiro Morimoto, Ryosuke Matsubara, Atsushi Kubono, Shigeki Naka
Summary: In this study, the hole injection in organic light-emitting diodes (OLEDs) is improved by utilizing a P(VDF/TrFE) polymer layer as a hole injection layer on the indium tin oxide (ITO) electrode surface. The device's driving voltage is lowered due to the enhanced hole injection. Additionally, the structural change in the ultrathin P(VDF/TrFE) layer significantly enhances the hole injection in OLEDs.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Seiichiro Izawa, Masahiro Morimoto, Shigeki Naka, Masahiro Hiramoto
Summary: Triplet exciton formation at an organic semiconductor interface is crucial for electronic devices and optical functions. The distribution of triplet excitons reveals that 90% of them are confined within 10 nm from the interface, leading to efficient TTA emission.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
