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이의진,한용운,문두경,강진규,김대환 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
In this study, three synthesized conjugated polymer electrolytes (CPEs) with different conjugation lengths were introduced as the hole transporting layer (HTL) of organic solar cells (OSCs) and polymer light emitting diodes (PLEDs). In order to control the dipole moment of CPEs, three different spacer units were choiced. The synthesized n-type CPEs were modified to p-type CPEs by facile oxidation process. To identify the effect on electrode work function tunability by changing molecular conformation and arrangement, we simulated density function theory (DFT) calculations of these molecules and performed ultraviolet photoelectron spectroscopy (UPS) analysis for films of indium-tinoxide (ITO)/CPEs. Additionally, we fabricated OSCs and PLEDs by using the CPEs as the HTL. As a result, the stability and performance were enhanced in the optimized devices with PFtT-D CPE HTL compared with PEDOT:PSS HTL-based devices.
이의진,최민희,한용운,문두경 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
A hole transport/extraction layer (HTL/HEL) is required to reduce energy barrier between anode and highest occupied molecular orbital (HOMO) level of polymer active layer and to improve transport/extraction of holes. PEDOT:PSS is the most commonly used HTL/HEL material for organic optoelectronic devices, such as organic light emitting diodes (OLEDs) and organic solar cells (OSCs), because of its solution processability, work function, sufficient conductivity and high optical transparency in the visible-NIR region. However, highly hygroscopic and acidic nature of PEDOT:PSS increase degradation rate of devices. In this study, we introduced new conjugated polyelectrolytes (CPEs) as HTL/HEL to overcome drawbacks of PEDOT:PSS. We synthesized three polymers with different heterocyclic compounds and fabricated PLEDs and PSCs to characterize performance. Dipole moment of CPEs was changed by atomic radius of hetero atom in heterocyclic rings and changed surface potential of anode.
Lee, Eui Jin,Choi, Min Hee,Han, Yong Woon,Moon, Doo Kyung American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.50
<P>In this study, we synthesized three conjugated polymer electrolytes (CPEs) with different conjugation lengths to control their dipole moments by varying spacers. P-type CPEs (PFT-D, PFtT-D, and PFbT-D) were generated by the facile oxidation of n-type CPEs (PFT, PFtT, and PFbT) and introduced as the hole-transporting layers (HTLs) of organic solar cells (OSCs) and polymer light-emitting diodes (PLEDs). To identify the effect on electrode work function tunability by changing the molecular conformation and arrangement, we simulated density functional theory calculations of these molecules and performed ultraviolet photoelectron spectroscopy analysis for films of indium tin oxide/CPEs. Additionally, we fabricated OSCs and PLEDs using the CPEs as the HTLs. The stability and performance were enhanced in the optimized devices with PFtT-D CPE HTLs compared to those of PEDOT:PSS HTL-based devices.</P>
Lee Seok Woo,Fan Xiangyang,Whang Dong Ryeol,Jang Ji Won,Choi Hyosung,Chang Dong Wook,Lee Bo Ram 한국정보디스플레이학회 2023 Journal of information display Vol.24 No.3
Optoelectronic devices with organic semiconductors, such as organic light-emitting diodes (OLEDs), have received much attention because they offer ease of processing and device flexibility. However, practical application of these devices is still hindered by relatively poor device performance and lack of cost-effective fabrication process, which represent properties largely determined by the molecular dipole moments of the organic molecules. In this study, we designed and prepared novel quinoxaline-phosphine oxide small molecules (QPSMs) as the electron transport layer (ETL) for the solution-processable OLEDs by tuning the end functional group of the aromatic QPSMs. A key design criterion was controlling the dipole moments of QPSMs, which confers (1) convenient deposition on the emission layer without further annealing through solubility in isopropanol and (2) improved electron injection/transport behavior through effective band level matching of the devices. In particular, the optimized OLEDs with (4-(2,3-bis(4-methoxyphenyl)quinoxalin-5-yl)phenyl)diphenylphosphine oxide (MQxTPPO1) exhibit external quantum efficiency (EQE) of 6.12%. Our results demonstrate the potential application of QPSMs as next-generation ETLs in organic semiconductors.
Choi, Hyosung,Park, Ji Sun,Jeong, Eunjae,Kim, Gi‐,Hwan,Lee, Bo Ram,Kim, Sang Ouk,Song, Myoung Hoon,Woo, Han Young,Kim, Jin Young WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.24
<P><B>Interface engineering by combination of TiO<SUB>x</SUB> and a conjugated polyelectrolyte as an electron transport layer</B> modifies the electrical contact between a metal electrode and an organic active layer with well‐aligned frontier orbital energy levels for efficient charge transport. This results in remarkable improvements in the device performance of inverted polymer solar cells and polymer light‐emitting diodes.</P>
Wenbo Lv,Yafang Song,Hebing Pei,Zunli Mo 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
Metal organic frameworks (MOFs), as a popular porous coordination polymer material, has the advantagesof controllable synthesis process, high specific surface area, high porosity and so on. In recent years,MOFs has been widely used in adsorption, separation, sensing, catalysis, environmental energy and otherfields. However, due to its weak conductivity, poor stability, and limited charge transfer, its practicalapplication is often limited. Quantum dots (QDs), a semiconductor nanocrystalline material with excellentsize tunability and fascinating electronic properties, are widely used in biosensing and photocatalysis. However, they have the disadvantages of poor luminescence stability and easy aggregation. Theconstruction of metal–organic framework and quantum dot composites (MOF@QDs) is expected toaddress the shortcomings of single materials through synergistic interactions and promote further developmentin more research areas. In this review, we mainly discuss the main synthesis strategies and characterizationmethods of MOF@QDs composite materials, and summarize the latest research progress indifferent research directions. Finally, we provide an outlook on the challenges and issues of MOF@QDsstill facing. It is hoped that this article will be of help to relevant research workers.