Article
Nanoscience & Nanotechnology
Hyein Ha, Young Jae Shim, Da Hwan Lee, Eun Young Park, In-Ho Lee, Seok-Keun Yoon, Min Chul Suh
Summary: A new small-molecular thermally cross-linkable material PbV was synthesized for hole transport layers in wet processed OLEDs, showing high glass temperatures and a triplet energy. By blending PbV with polymeric HTM, a semi-interpenetrating network was formed, leading to significantly improved efficiency and lifetime of the OLED device.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Environmental
Seon Lee Kwak, Hea Jung Park, Jae-Ho Jang, Jeong Yong Park, Jong Mok Park, Jihoon Lee, Do-Hoon Hwang
Summary: In this study, a cross-linkable poly(iminoarylene) was synthesized as a hole injection layer for solution-processed OLEDs, and a red phosphorescent OLED device was fabricated. The crosslinked poly(iminoarylene) showed good film-forming properties and solvent resistance after heating, and the fabricated device exhibited low turn-on voltage, high current efficiency, and high external quantum efficiency, with a longer lifetime compared to the reference device.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Jian Yang, Liming Xie, Yuan-Qiu-Qiang Yi, Xiaolian Chen, Changting Wei, Yun Guo, Yang Liu, Bo Qian, Wenming Su, Zheng Cui
Summary: A novel deep-blue light-emitting material DPCS-DPS has been designed and synthesized with bipolar charge-transporting properties and good solvent-resistance after thermal cross-linking, suitable for solution-processed OLEDs. Using DPCS-DPS, non-doped OLED achieved a deep-blue emission wavelength of 415 nm, while doped devices reached a maximum current efficiency of 1.19 cd A-1 and maximum power efficiency of 0.75 lm W-1.
Article
Nanoscience & Nanotechnology
Athithan Maheshwaran, Hyejeong Bae, Jaehyoung Park, Hyeonwoo Jung, Youngjun Hwang, Jongyoun Kim, Chaehyun Park, Byeongjae Kang, Myungkwan Song, Youngu Lee
Summary: In this study, a series of low-temperature cross-linkable HTMs comprising DBF and divinyl-functionalized TPA segments were designed and synthesized for highly efficient solution-processed QLEDs and OLEDs. The cross-linked 3-CDTPA exhibited excellent hole transport properties with low cross-linking temperature and short curing time. By applying 3-CDTPA as the HTL in green QLEDs and OLEDs, high quantum efficiency and color purity were achieved.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Green & Sustainable Science & Technology
Ya -Wen Lin, Wei-Hao Lee, Kae-Long Lin, Ta-Wui Cheng, Bo-Yi Kuo
Summary: This article proposes a cost-effective method to produce mesoporous materials by recycling LED waste quartz and stone sludge. The modified material shows excellent humidity control performance and achieves 100% recycling of industrial byproducts, contributing to sustainable development goals.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Multidisciplinary
Jingyi Zhang, Hongli Liu, Xianggao Li, Shirong Wang
Summary: This study successfully achieved crosslinking of hole transporting materials by lowering the crosslinking temperature, resulting in materials with high solvent resistance, which promotes the development of solution-processed OLEDs.
ORGANIC ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Hao Yang, Jochen Bruckbauer, Lyudmyla Kanibolotska, Alexander L. Kanibolotsky, Joseph Cameron, David J. Wallis, Robert W. Martin, Peter J. Skabara
Summary: The use of organic materials and the replacement of rare-earth elements in light-emitting devices have become popular recently. This study presents the synthesis and characterisation of a novel organic green-emitting material (GreenCin) and its performance as a down-converting layer in hybrid LEDs. The hybrid devices offer improved luminous efficacy, radiant flux, and blue-to-white efficacy compared to devices without cross-linked analogues of GreenCin.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Physics, Applied
Ziqian Qi, Linning Wang, Yingze Liang, Pengzhan Liu, Hongbo Zhu, Yongjin Wang
Summary: This article introduces a solar-blind full-duplex light communication system using 275-nm DUV LEDs, which eliminates electromagnetic interference and solar noise. The system allows a maximum communication distance of 7 meters and supports real-time video and file sharing.
APPLIED PHYSICS LETTERS
(2023)
Review
Environmental Sciences
Chenchen Zhang, Zhe Zhu, Jing Zhao, Yanxia Li, Zhaoying Zhang, Yajuan Zheng
Summary: "The use of LEDs has increased in the 21st century, causing concerns about their impact on retinal circadian rhythms and refractive development. This paper reviews the possible mechanisms by which LEDs disrupt retinal circadian rhythms and suggests the potential link between prolonged LED exposure and the increasing prevalence of myopia. Several countermeasures are proposed to mitigate the effects of LED interference on retinal circadian rhythms and reduce the onset and progression of myopia."
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Electrical & Electronic
G. Kalyon, S. Mutlu, F. Kuruoglu, I. Pertikel, I. Demir, A. Erol
Summary: We report an n-type In0.53Ga0.47As based Gunn light emitting diode operated at around 1.6 mu m. The device structure comprises of an n-type In0.53Ga0.47As epilayer with a thickness of 5 mu m grown by Metal Organic Vapour Phase Epitaxy (MOVPE) on a semi-insulating InP substrate and fabricated in a planar architecture with a stepped structure at anode side to suppress the destructive effect of high built-in electric field in propagating Gunn domain. Gunn diode is operated under pulsed voltage with a pulse width of 60 ns and pulse duration of 4.5 ns to keep the duty cycle as low as 0.0013%. The Gunn oscillations with an 1 ns period are observed at around 4.1 kV/ cm, which corresponds to the electric field threshold of Negative Differential Resistance (NDR). The light emission at around 1.6 mu m also starts at the threshold electric field of the NDR region (E = 4.2 kV/cm) of the current-voltage curve, and the emission intensity increases drastically with increasing applied electric field. The observed light emission at NDR threshold electric field where Gunn oscillations appear on the voltage pulse is attributed to the impact ionisation process occurring in the current domains along the sample, which generates excess carriers to initiate the band-to-band recombination in In0.53Ga0.47As.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Hanleem Lee, Ji Won Jeong, Mo Geun So, Gun Young Jung, Chang-Lyoul Lee
Summary: By controlling the ligand-binding kinetics, this work prevents surface defects in perovskite quantum dots, leading to an increase in photoluminescence quantum yield and improved environmental stability. The resulting cross-linked perovskite quantum dot film shows enhanced chemical stability without compromising optoelectrical properties, enabling the successful fabrication of high-resolution white electroluminescent devices by inkjet printing using green and red perovskite quantum dots.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yu-Jin Kim, Sung-Won Kim, Ju-Ro Lee, Soong Ho Um, Yoon Ki Joung, Suk Ho Bhang
Summary: This study investigated the cytotoxic effects of LED and OLED light sources on stem cells, finding that the LED group induced higher apoptotic activity due to significant heat generation compared to OLED. Additionally, the LED group showed significant expression of intracellular reactive oxygen species, while increased cell proliferation was confirmed in the OLED group.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Jie Li, Heqi Gong, Jincheng Zhang, Hui Liu, Li Tao, Yanqing Wang, Qiang Guo
Summary: This study successfully designed a deep-blue emitting exciplex system with high photoluminescence quantum yield and external quantum efficiency. The OLED constructed using this exciplex system displayed deep-blue emission with excellent performance metrics.
Article
Biochemistry & Molecular Biology
Ning Tu, S. W. Ricky Lee
Summary: This paper presents a large-emitting-area quantum dot light-emitting diode (QLED) fabricated using a full-solution process. The QLED exhibits a low turn-on voltage and its unique structure enables its application in inkjet printing and display applications.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Applied
Kaiyong Sun, Jie Wu, Lingling Zhu, Hongxiang Liu, Yu Zhou, Wenwen Tian, Zhaosheng Cai, Wei Jiang, Yueming Sun
Summary: By designing and synthesizing new cross-linkable thermally activated delayed fluorescence (TADF) dendrimer molecules, a blue all-solution-processed organic light-emitting diode (OLED) was developed. The use of DVCz-3CzCN molecule was found to form stable and uniform thin films, effectively suppressing triplet exciton concentration quenching.
Article
Materials Science, Multidisciplinary
Gintare Krucaite, Raminta Beresneviciute, Daiva Tavgeniene, Saulius Grigalevicius, Baohua Zhang, Alytis Gruodis, Katsiaryna Chernyakova, Renata Karpicz
Summary: Three diarylfluorene derivatives were synthesized and characterized as electroactive materials with high thermal stability. Among them, a derivative showed the best performance and was used in organic light emitting diodes with Alq(3) as the emitter, exhibiting a turn-on voltage of 4.6 V, maximum photometric efficiency of 2.8 cd A(-1), and maximum brightness of about 7760 cd m(-2).
Article
Materials Science, Multidisciplinary
Dovydas Blazevicius, Gintare Krucaite, Shahnawaz Shahnawaz, Sujith Sudheendran Swayamprabha, Ernestas Zaleckas, Jwo-Huei Jou, Saulius Grigalevicius
Summary: By synthesizing low molecular weight derivatives with carbazole (H1) or phenoxazine (H2) as host materials, efficient and high-performance yellow PhOLEDs were fabricated for phosphorescent organic light emitting diodes. Among them, devices based on H2 as the host material exhibited superior characteristics, such as lower turn-on voltage and higher power efficiency.
Article
Biochemistry & Molecular Biology
Iram Shahnawaz, Iram Siddiqui, Mangey Ram Nagar, Abhijeet Choudhury, Jin-Tin Lin, Dovydas Blazevicius, Gintare Krucaite, Saulius Grigalevicius, Jwo-Huei Jou
Summary: The newly developed low color temperature candlelight organic LED device is human and environmentally friendly, mimicking candlelight without harmful blue emission. Compared to traditional lighting devices, it has better design and performance, with less impact on the human circadian rhythm.
Article
Materials Science, Multidisciplinary
Sujith Sudheendran Swayamprabha, Gintare Krucaite, Deepak Kumar Dubey, Kiran Kishore Kesavan, Joydip De, Mangey Ram Nagar, Hsun Lee, Simona Sutkuviene, Santanu Pal, Sun-Zen Chen, Raminta Beresneviciute, Saulius Grigalevicius, Jwo-Huei Jou
Summary: Solution processable hole transporting materials (HTMs) play a crucial role in the cost-effective production of large-area organic light emitting diodes (OLEDs). The synthesized fluorene-based HTMs exhibited exceptional solubility, thermal stability, suitable molecular energy level alignment, and high triplet energies, making them promising candidates for high-efficiency OLED devices. The solution-processed yellow phosphorescent OLEDs utilizing these HTMs showed improved current efficiency and external quantum efficiency compared to reference devices, suggesting their potential in OLED technology.
Review
Chemistry, Physical
Gintare Krucaite, Saulius Grigalevicius
Summary: OLED is a promising technology in lighting and display applications, with carbazole-based compounds being extensively studied for their useful chemical and electronic characteristics. Substituted derivatives, easily modified by simple reactions, are widely used in OLEDs due to their good charge carrier injection and transfer characteristics, electroluminescence, and improved thermal and morphological stability as well as their thin film forming characteristics.
Article
Materials Science, Multidisciplinary
Mangey Ram Nagar, Abhijeet Choudhury, Daiva Tavgeniene, Raminta Beresneviciute, Dovydas Blazevicius, Vygintas Jankauskas, Krishan Kumar, Subrata Banik, Subrata Ghosh, Saulius Grigalevicius, Jwo-Huei Jou
Summary: In this study, a series of novel solution-processable hole-transporting materials (HTMs) were successfully synthesized and used in solution-processed OLEDs, demonstrating superior performance.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Cheng-Yung Ho, Gintare Krucaite, Raminta Beresneviciute, Dovydas Blazevicius, Wei -Han Lin, Jhao-Cheng Lu, Chang -Yu Lin, Saulius Grigalevicius, Chih-Hao Chang
Summary: Molecules with wide energy bandgaps and aggregation-induced emission characteristics have been designed and synthesized. The results show that these molecules exhibit high efficiency and high luminance, making them promising for applications in organic light-emitting diodes.
ORGANIC ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Daiva Tavgeniene, Raminta Beresneviciute, Dovydas Blazevicius, Gintare Krucaite, Greta Jacunskaite, Sujith Sudheendran Swayamprabha, Jwo-Huei Jou, Saulius Grigalevicius
Summary: Well-defined electroactive bipolar derivatives of new structure have been synthesized and characterized. These amorphous materials show high glass transition temperatures and thermal stability. One of the compounds demonstrates excellent characteristics as an emitter in OLEDs.
Article
Materials Science, Multidisciplinary
Mangey Ram Nagar, Krishan Kumar, Dovydas Blazevicius, Raminta Beresneviciute, Gintare Krucaite, Daiva Tavgeniene, Chen Tun Hao, Subrata Banik, Jwo-Huei Jou, Saulius Grigalevicius
Summary: Solution-processable bipolar carbazole-benzophenone derivatives were successfully synthesized as host materials for green TADF organic LEDs. These hosts exhibited high-triplet energies, balanced charge-transporting properties, and good solubility, leading to excellent device performance.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Biochemistry & Molecular Biology
Daiva Tavgeniene, Baohua Zhang, Saulius Grigalevicius
Summary: A group of di(arylcarbazole)-substituted oxetanes were synthesized and characterized. These compounds exhibited high thermal stability and were suitable for forming stable amorphous layers for optoelectronic devices. They also demonstrated superior hole transporting properties in organic light emitting diodes, showing great potential in the field of optoelectronics.
Article
Chemistry, Multidisciplinary
Prakalp Gautam, Iram Shahnawaz, Iram Siddiqui, Dovydas Blazevicius, Gintare Krucaite, Daiva Tavgeniene, Jwo-Huei Jou, Saulius Grigalevicius
Summary: Organic light-emitting diodes (OLEDs) have made significant technological advancements in various industries and are considered a mainstream technology. This study introduces new bicarbazole-benzophenone-based twisted donor-acceptor-donor (D-A-D) derivatives as bi-functional materials for OLEDs. These materials exhibit excellent properties such as high decomposition and glass transition temperatures, high photoluminescence quantum yield, wide bandgap, and short decay time. They are utilized as blue emitters and host materials for deep-blue and green OLEDs, showing promising performance in terms of efficiency and quantum yield. These easily synthesized, economical materials have the potential to be used in cost-effective and high-performance OLED applications, particularly in displays.
Article
Chemistry, Applied
Daiva Tavgeniene, Raminta Beresneviciute, Gintare Krucaite, Beata Achramovic, Ernestas Zaleckas, Saulius Grigalevicius, Jian-Sheng Hong, Kuan-Wei Chen, Yu-Hsuan Chen, Chih-Hao Chang
Summary: New tetraphenylethene-based aggregation-induced emission (AIE) compounds with high thermal stability and AIE properties were synthesized. These compounds can form thin homogenous layers for the preparation of organic light-emitting diodes. The most efficient blue light-emitting device achieved an efficiency of 3.4%. This synthetic strategy shows promise for preparing AIE emitters for first-generation light-emitting devices.
Article
Biochemistry & Molecular Biology
Raminta Beresneviciute, Prakalp Gautam, Mangey Ram Nagar, Gintare Krucaite, Daiva Tavgeniene, Jwo-Huei Jou, Saulius Grigalevicius
Summary: Organic light-emitting diodes (OLEDs) have revolutionized technology, contributing significantly to improving our daily lives. With exceptional display and lighting capabilities, OLEDs have become indispensable in industries such as smartphones, tablets, televisions, and automobiles. They have emerged as a dominant technology, inspiring continuous advancements and improvements.
Article
Spectroscopy
Sonia Kotowicz, Daiva Tavgeniene, Raminta Beresneviciute, Ernestas Zaleckas, Gintare Krucaite, Agnieszka Katarzyna Pajak, Mateusz Korzec, Jan Grzegorz Malecki, Marek Lipinski, Saulius Grigalevicius, Ewa Schab-Balcerzak
Summary: Fluorene-based low molar weight derivatives were synthesized using Suzuki reactions with key starting materials of 9-benzylidene-2,7-dibromofluorene or 3-(2,7-dibromofluoren-9-ylmethylen)-9-ethylcarbazole and various aryl boronic acids. The compounds exhibited high thermal stability and some showed a high glass transition temperature above 125°C. They also demonstrated electrochemical activity and a energy band gap below 2.97 eV. The investigations were supported by DFT calculations and the photovoltaic ability of the compounds was tested in organic-inorganic solar cells.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Review
Chemistry, Multidisciplinary
Iram Siddiqui, Sudhir Kumar, Yi-Fang Tsai, Prakalp Gautam, Kiran Kesavan, Jin-Ting Lin, Luke Khai, Kuo-Hsien Chou, Abhijeet Choudhury, Saulius Grigalevicius, Jwo-Huei Jou
Summary: This article reviews the importance of blue emission for full-color displays and solid-state lighting, as well as the performance and development of blue OLEDs. It also discusses the challenges and approaches to achieving higher efficiency and deeper blue emission.
Article
Materials Science, Multidisciplinary
Katerina Skopalova, Itana Nusa Bubanja, Dragomir Stanisavljev, Nikola Cvjeticanin, Vera Kasparkova, Eliska Dad'ova, Erika Pavlikova, Marek Koutny, Marija Gizdavic-Nikolaidis, Petr Humpolicek
Summary: This study compares the biological properties of PANI prepared by different synthesis methods and oxidizing agents, which improves its potential applications in the biomedical field.
Article
Materials Science, Multidisciplinary
Hui-Ping Li, Cai-Yan Gao, Zhi-Ping Chen, Xin-Heng Fan, Lian-Ming Yang
Summary: In this study, a novel type of D-A non-fused-ring copolymers was designed and synthesized to overcome the trade-off relationship between electrical conductivity and Seebeck coefficient in organic semiconductors. The incorporation of fluorine atoms into the polymer backbone effectively increased the ordered degree of molecular stacking and improved both the electrical conductivity and Seebeck coefficient. The bimodal orientation of polymers played a crucial role in decoupling the correlation between electrical conductivity and Seebeck coefficient.
Article
Materials Science, Multidisciplinary
Mansour A. S. Salem, Amjad Mumtaz Khan, Hatem A. M. Saleh, Khalil M. A. Qasem, Mizna Ahmed, Aadil Shafi Bhat, Abdulaziz Abdullah Qasem Ali, Younes S. A. Ghanem, Ali Alrabie, Abdel-Basit Al-Odayni, Waseem Sharaf Saeed, Basheer Al-Anesi
Summary: This research focuses on the versatile substance, polyaniline/layered double hydroxide (PANI@Nd-Co/LDH), under solvothermal conditions. A thorough analysis of its structure and morphology was conducted using various analytical methods. The findings showed that PANI@Nd-Co/LDH exhibited highly sensitive and specific fluorescence detection of Pb(II) and Al(III), outperforming other heavy metal ions. The sensor demonstrated a turn-off fluorescence response for Pb(II) ions and a turn-on fluorescence response for Al(III) ions. The minimum detectable limits (MDL) were determined to be 9.6 nM for Pb(II) and 220 nM for Al(III). PANI@Nd-Co/LDH could be easily regenerated and reused for multiple cycles. The detection mechanisms involved the inner filter effect (IFE) for Pb(II) and the chelation-enhanced fluorescence (CHEF) effect for Al(III). These results highlight the excellent potential of PANI@Nd-Co/LDH in the detection and recognition of Pb(II) and Al(III) ions.
