Article
Optics
Shuaibing Li, Liang Zhou, Qi Zhu, Ruixia Wu, Kai Chen, Zhenzhen Li, Hongjie Zhang
Summary: Novel blue and white organic light-emitting diodes (OLEDs) were designed using FK306 as a sensitizer, which acts as an electron trapper in the electron transport layer, enhancing carrier recombination probability and suppressing exciton annihilation. This results in improved device performance with low turn-on voltages and high efficiencies.
JOURNAL OF LUMINESCENCE
(2021)
Article
Chemistry, Multidisciplinary
Junseop Lim, Si Hyun Han, Jun Yeob Lee
Summary: The authors report on organic light-emitting diodes (OLEDs) emitting light through charge-transfer (CT) complex formation in the light-emitting layer. Two phosphorescent materials with energy level offset are chosen for efficient CT complex generation. The resulting CT complex emits a yellow light under an electric field and can be used to create white OLEDs with blue and yellow emissions at a quantum efficiency of 13.7%. Further material development is expected to enhance the quantum efficiency of CT complex OLEDs.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Min Gao, Yufei Tu, Dadi Tian, Huawei Yang, Xiaoyu Fang, Fengjuan Zhang, Huaibin Shen, Zuliang Du
Summary: Developing high-quality and cadmium-free blue quantum dots and their efficient light-emitting diodes (LEDs) is crucial for industrialization. Sn-doped ZnO was used to mitigate electron over-injection in deep-blue cadmium-free QLEDs, improving their efficiency and lifetime and offering an effective pathway for commercialization.
Article
Nanoscience & Nanotechnology
Yunfeng Fang, Penglong Bai, Jiayi Li, Binbin Xiao, Yiqing Wang, Yanping Wang
Summary: In this study, high-efficiency red QLEDs were obtained by employing specific mixtures of polymers as hole-transport layers. The QLED exhibited excellent luminance performance and long lifetime, with the improvements attributed to more balanced charge transport and efficient hole-electron recombination in the emissive layer.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Bochen Liu, Yue Guo, Qiang Su, Yunfeng Zhan, Zhao Chen, Yang Li, Baogui You, Xiaonan Dong, Shuming Chen, Wai-Yeung Wong
Summary: A new strategy is developed to synthesize red, green, and blue quantum dots using CdZnS as the outermost shell. The inner ZnS and ZnSe shells confine the excitons inside the QD cores, while the CdZnS shell reduces the energy barrier for hole injection, resulting in high-performance QLEDs.
Article
Optics
Qi Zhu, Liang Zhou, Weiqiang Liu, Yingjie Cui, Ruixia Wu, Jiahai Wang, Qingduo Duanmu
Summary: An efficient blue organic electroluminescent device was achieved by optimizing the double light-emitting layers structure, selecting appropriate host materials, and adjusting the doping concentration. The device exhibited good thermal stability and high current efficiency, making it a promising candidate for practical applications in the field of optoelectronics.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Dayu Huang, Pan Zheng, Ziyong Cheng, Qianqian Yang, Youchao Kong, Qiuyun Ouyang, Hongzhou Lian, Jun Lin
Summary: A hydrothermal method is used to synthesize two different single crystal materials with different shapes and phases. These materials can emit deep blue light and pure blue light. The difference in the distribution of Cl energy states is found to be the reason for the difference in luminescence properties.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Wenqing Zhu, Yipeng Chen, Lu Huang, Kuangyu Ding, Jun Li, Bin Wei
Summary: In this study, an all-solution-processed multi-layer green phosphorescent organic light-emitting diodes (OLEDs) using zinc sulfide quantum dots (ZnS QDs) based electron injection layer (EIL) were demonstrated. By utilizing a proper work function ZnS QDs EIL and inserting a PEI interlayer, efficient electron injection and solvent resistance were achieved, leading to a significant improvement in current efficiency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Atefeh Ghorbani, Junfei Chen, Peter Chun, Quan Lyu, Giovanni Cotella, Hany Aziz
Summary: Researchers have found that the fast electroluminescence (EL) loss in blue quantum dot light-emitting devices (QLEDs) is not caused by a decrease in the photoluminescence quantum yield of the quantum dots (QDs), but rather due to changes in charge injection over time that result in a deterioration of charge balance. The study also reveals that these changes are associated with variations in hole and electron trap densities. This research provides insights for improving the design of blue QLEDs and paves the way for commercialization of QLEDs technology.
Article
Engineering, Environmental
Min Woo Ha, Chul Woong Joo, Jiyong Park, JunHo Hwa, Hyein Jeong, Jonghee Lee, Yun-Hi Kim
Summary: The novel phosphorescent emitters FIr4mpic and FIr4tpic were synthesized to enhance the chromaticity and emission efficiency of the main blue phosphor FIrpic. These new emitters showed higher luminance and deeper blue light emission, with FIr4mpic achieving a maximum EQE of 18.77% and a maximum CE of 36.17 cd/A. Additionally, electronic properties were investigated using DFT calculations to explain the improved quantum yield of FIr4mpic compared to other emitters.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Natsuko Urushihara, Tadahiko Hirai, Akansha Dager, Yuta Nakamura, Yuma Nishi, Ken Inoue, Ryo Suzuki, Makoto Tanimura, Kazuteru Shinozaki, Masaru Tachibana
Summary: Natural product-derived carbon dots have successfully achieved electroluminescence, showing great potential for applications in LEDs.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Deli Li, Di Liu, Jiuyan Li, Ruizhi Dong, Botao Liu, Qinhe Wei
Summary: Two molecules, 3-BPyBCz and o-BPyBCz, have been developed as host materials for sky-blue phosphorescent organic light-emitting diodes (PhOLEDs), with extremely low driving voltages and superior performance.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Nanoscience & Nanotechnology
Sidney A. Howell, Manikandan Koodalingam, Junhyuk Jang, Chandana Sampath Kumara Ranasinghe, Mile Gao, Ronan Chu, Mohammad Babazadeh, David M. Huang, Paul L. Burn, Paul E. Shaw, Emma V. Puttock
Summary: The authors synthesized a family of first-generation dendrimers with 3,5-bis(carbazolyl)-phenyl dendrons attached to a green emissive fac-tris(2-phenylpyridyl)iridium(III) core. The dendrimers' solubility was increased by adding tert-butyl surface groups to the carbazole moieties. The density of the films containing doubly dendronized materials was higher than those containing mono-dendronized counterparts, with the highest density at 1.12 +/- 0.04 g cm-3 for the dendrimer with two rotationally constrained dendrons per ligand. The dendrimers also showed high photoluminescence quantum yields (PLQYs) in solution and were incorporated into solution-processed OLEDs with high external quantum efficiencies.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Dongbeom Heo, Jun Hyuk Chang, Doyoon Shin, Jeonghun Kwak, Wanki Bae, Hyunho Lee
Summary: Balanced charge injection is crucial for highly efficient QLEDs. The modification of magnesium-doped ZnO nanoparticles (ZMO NPs) effectively suppresses electron injection into the InP QD layer. The modified ZMO-NP-based InP QLEDs exhibit higher external quantum efficiency and enhanced operational lifetime compared to unmodified ZMO NPs.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Wanqi Ren, Kyung Rock Son, Tae Geun Kim
Summary: Blue TADF top-emission organic light-emitting diodes (OLEDs) with a second-order microcavity structure exhibit high external quantum efficiency (-20.2%) and narrow full width at half maximum (29 nm) by incorporating a Ni-doped SiO2 buffer layer that balances injection charges. The wide bandgap of SiO2 prevents rapid hole injection from the anode and modifies the anode-organic layer interface, while tuning of the Ni doping concentration reduces the turn-on voltage of the device through co-sputtering. The charge balance mechanism is elucidated by analyzing tunneling effects across the buffer layer and the bonding states of Ni atoms in the SiO2 film. This study can promote the development of TADF top-emission devices with high efficiency and color purity.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Anky Fitrian Wibowo, Joo Won Han, Jung Ha Kim, Ajeng Prameswati, Siti Aisyah Nurmaulia Entifar, Jihyun Park, Jonghee Lee, Soyeon Kim, Dong Chan Lim, Myoung-Woon Moon, Min-Seok Kim, Yong Hyun Kim
Summary: Researchers have developed a highly stretchable, conductive, and transparent natural rubber/silver nanowire/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) composite film for wearable sensors. The film exhibits excellent mechanical and chemical stability, making it suitable for monitoring human motion and biological signals.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Jeonghun Kang, Jeong Hyuk Lee, Han-Koo Lee, Kwang-Tak Kim, Jin Hyeok Kim, Min-Jae Maeng, Jong-Am Hong, Yongsup Park, Kee Hoon Kim
Summary: This study comparatively investigates the electrical properties and electronic structure of (Ba,La)SnO3 films on different substrates. The results show that threading dislocations significantly reduce the carrier density and electron mobility in the films. Furthermore, the effect of threading dislocations on the binding energies of the Sn 3d core level and the valence band maximum is different, leading to the suppression of band gap renormalization.
Article
Nanoscience & Nanotechnology
Hui Ung Hwang, Jiyoung Yoon, Youn-Seoung Lee, Jangwon Lee, Jonghee Lee, Kyung-Geun Lim, Jeong Won Kim
Summary: This study investigates the CuSCN thin film for OLED devices, comparing films produced by vacuum deposition and solution processing. The vacuum-deposited CuSCN film demonstrates an impurity-free composition and a high density of band-tail states, leading to clear advantages in device performance and manufacture.
Article
Materials Science, Multidisciplinary
Joo Won Han, Ajeng Prameswati, Siti Aisyah Nurmaulia Entifar, Jung Ha Kim, Anky Fitrian Wibowo, Jihyun Park, Jonghee Lee, Soyeon Kim, Dong Chan Lim, Myoung-Woon Moon, Min-Seok Kim, Yong Hyun Kim
Summary: This study investigates highly conductive, flexible, and durable silver nanowire (AgNW)-embedded carboxymethyl cellulose (CMC)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) (s-CMC/PEDOT:PSS) composite films for wearable heaters and on-skin sensors. By optimizing the electrical conductivities of the CMC/PEDOT:PSS composites and embedding AgNW networks, the resulting s-CMC/PEDOT:PSS composite films exhibit high performance and mechanical stability. These films have great potential in next-generation electronics.
ELECTRONIC MATERIALS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Jaehyun Moon, Keunsoo Lee, Seung Koo Park, Chul Woong Joo, Jin-Wook Shin, Jonghee Lee, Nam Sung Cho
Summary: Surface wrinkles of mesoscopic size were formed by photocuring of a synthesized linear liquid pre-polymer. The relationship between wrinkle amplitude and period indicates constant compressive strain. The stiffness ratio between the film and foundation decreases as the initial film becomes thinner, providing a measure for estimating wrinkle size. Mesoscopic wrinkles were investigated as optical structures for enhancing light outcoupling and spectral stability of organic light emitting diodes.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Baeksang Sung, Chul Woong Joo, Jun Chang Yang, Akpeko Gasonoo, Seung Wan Woo, Jae-Hyun Lee, Steve Park, Jonghee Lee
Summary: This paper proposes the application of an optical property-enhancement film to TEOLEDs, which improves the uniformity of light distribution and reduces the variation in electroluminescence spectrum at different angles. Additionally, the reduction in total internal reflection in the film structure leads to a significant improvement in the external quantum efficiency and current efficiency.
JOURNAL OF INFORMATION DISPLAY
(2023)
Article
Materials Science, Multidisciplinary
Gunel Huseynova, Amos Amoako Boampong, Kyeong Min Yu, Ye-Seul Lee, Jonghee Lee, Min-Hoi Kim, Jae-Hyun Lee
Summary: In this study, an n-doped PEDOT:PSS polymer was presented for its application in OxTFTs. By using a reduced molecule of MR as an n-type dopant, the electron conductivity of PEDOT:PSS was effectively increased and the work function was decreased. The n-doped PEDOT:PSS was successfully applied as the contact electrodes in bottom-gate top-contact OxTFTs, showing significantly improved electron mobility compared to undoped PEDOT:PSS electrodes.
JOURNAL OF INFORMATION DISPLAY
(2023)
Article
Nanoscience & Nanotechnology
Ajeng Prameswati, Siti Aisyah Nurmaulia Entifar, Joo Won Han, Anky Fitrian Wibowo, Jung Ha Kim, Yulia Shara br Sembiring, Jihyun Park, Jonghee Lee, Ah-Young Lee, Myoung Hoon Song, Soyeon Kim, Dong Chan Lim, Youngho Eom, Sohyun Heo, Myoung-Woon Moon, Min-Seok Kim, Yong Hyun Kim
Summary: In this study, high-performance hydrogels based on PVA/PEDOT:PSS were developed, which exhibited excellent mechanical properties, fast electrical response, and ultralow hysteresis. These hydrogels also demonstrated self-healing properties and were capable of tracking large human motion and subtle muscle action in real time with high sensitivity.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Anky Fitrian Wibowo, Joo Won Han, Jung Ha Kim, Ajeng Prameswati, Siti Aisyah Nurmaulia Entifar, Jihyun Park, Jonghee Lee, Soyeon Kim, Dong Chan Lim, Youngho Eom, Myoung-Woon Moon, Min-Seok Kim, Yong Hyun Kim
Summary: In this study, a conductive, stretchable, hydro-biodegradable, and highly robust cellulose/PEDOT:PSS hybrid film is fabricated. Through the synergetic interplay of a conductivity enhancer, nonionic fluorosurfactant, and surface modifier, the mechanical and electrical properties of the stretchable hybrid film are greatly improved. The stretchable cellulose/PEDOT:PSS hybrid film achieves a limited resistance change of only 1.21-fold after 100 stretch-release cycles (30% strain) with exceptionally low hysteresis, demonstrating its great potential as a stretchable electrode for stretchable electronics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Song Lee, Jeong-In Lee, Chang-Hyun Kim, Jin-Hyuk Kwon, Jonghee Lee, Amos Amoako Boampong, Min-Hoi Kim
Summary: The charge trap property of solution-processed zirconium acetylacetonate (ZAA) for solution-processed nonvolatile charge-trap memory (CTM) transistors is demonstrated. The RT-dried ZAA for the p-type organic-based CTM shows the widest threshold voltage shift (Delta V-TH approximate to 80 V) and high memory on- and off-current ratio (I-M,I-ON/I-M,I-OFF approximate to 5X10(4)). The inability of the Ox-CTM to be electrically erasable is well explained with simulated electrical potential contour maps.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jaeyoul Kim, Ahyoung Hong, Donghyo Hahm, Hyunkoo Lee, Wan Ki Bae, Taesoo Lee, Jeonghun Kwak
Summary: Quantum dot light-emitting diodes (QLEDs) suffer from over-injection of electrons compared to holes, limiting device efficiency. This study analyzes energy transfer mechanisms and compares exciton-harvesting layers (EHLs) composed of phosphorescence (PH) or thermally activated delayed fluorescence (TADF) blue dopant. The study confirms that TADF-EHL has a significant contribution to energy transfer and achieves highly efficient top-emission green QLEDs with the TADF-EHL.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Min-Hoi Kim, So-Hyeon Lee, Hea-Lim Park, Seung-Hoon Lee, Eun-Kyung Noh, Subin Hwa, Jonghee Lee, Jae-Hyun Lee
Summary: We systematically investigated the mechanism of subtractive contact patterning (SCP) and demonstrated its application in high resolution organic light-emitting diodes (OLEDs). SCP process was found to generate patterns in crystalline and amorphous thin films through delamination and diffusion mechanisms, respectively. The pattern depth in the diffusion mechanism was found to be deeper with higher processing temperature and longer processing time. SCP can be applied to doped small molecule-based thin films, but has limited application in polymer thin films. A high-resolution OLED pattern of less than 10 mu m wide was successfully fabricated using SCP process, and it showed potential for roll-to-roll processes. This study provides a scientific and technological basis for the fabrication of high-resolution patterns in organic electronic devices like OLEDs.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ye-Seul Lee, Akeem Raji, Eun-Kyung Noh, Ji-Hyeon Yoon, Baeksang Sung, Akpeko Gasonoo, Jonghee Lee, Min-Hoi Kim, Yoonseuk Choi, Yuji Shibasaki, Jae-Hyun Lee
Summary: The chemical and structural characteristics of a solution-processed polymer with intrinsic microporosity (PIM) based on 9,9-bis(4-hydroxyphenyl) fluorene (BHPF) film were investigated. The PIM film exhibited flexibility, transparency, thermal stability, and high surface energy. It proved to be a good candidate for advanced organic electronic devices and next-generation displays.
JOURNAL OF INFORMATION DISPLAY
(2023)
Article
Materials Science, Multidisciplinary
Su-Ji Kim, Akeem Raji, Akpeko Gasonoo, Jonghee Lee, Jae-Hyun Lee
Summary: Impedance spectroscopy was applied to investigate the charge transportation and accumulation mechanisms in a mixed-host emissive layer (EML) of phosphorescent organic light-emitting diodes (OLEDs). The utilization of the same material as the mixed-host EML, in combination with the negative interfacial charges in the polarized TPBi material, led to enhanced current and power efficiency by eliminating energy barriers within the device. The capacitance-frequency (C-F) characteristics of the devices were simulated with an equivalent circuit to quantitatively determine the capacitance and resistance in each organic layer, providing insights into the improved electrical properties within the device.
ORGANIC ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Jaehyun Moon, Ju-Hun Lee, Jusun Park, Chul Woong Joo, Dae-Hyun Ahn, Joo Yeon Kim, Ju Young Woo, Seung-Youl Kang
Summary: This work introduces a technical approach for generating white light using colloidal solutions containing green perovskite nanocrystals and red quantum dots. By combining the excitation source and blue top-emission organic light-emitting diodes, white light with various color temperatures can be generated. This method has potential applications in photonics where controllable color temperature is desired.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Mengjiao Dong, Liyun Liao, Chensheng Li, Yingxiao Mu, Yanping Huo, Zhong-Min Su, Fushun Liang
Summary: This study investigates the influence of the polarity of polymer matrices on persistent room-temperature phosphorescence (pRTP). It is discovered that intense phosphorescence emission can be achieved in highly polar matrices such as polyacrylic acid (PAA). The dipole-dipole interaction between the polar fluorophore and polar matrix is proposed to stabilize the excited state and facilitate the generation of efficient room-temperature phosphorescence emissions.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Han-Jiang Yang, Weijia Xiang, Xiangzhou Zhang, Jin-Yun Wang, Liang-Jin Xu, Zhong-Ning Chen
Summary: This article reports a 2D copper(I)-based cluster material for X-ray imaging, which exhibits ultra-high spatial resolution, high photoluminescence efficiency, and low detection limit. The material shows excellent linear response to X-ray dose rates and light output, and has the best spatial resolution among reported lead-free metal halide hybrids.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Review
Materials Science, Multidisciplinary
Taek Joon Kim, Sang-hun Lee, Dayeong Kwon, Jinsoo Joo
Summary: Donor-acceptor heterostructures using organic-inorganic halide perovskites, two-dimensional transition metal dichalcogenides, pi-conjugated organic small/macro molecules, and quantum dots are promising platforms for exciton-based photonics and optoelectronics. Hetero-interlayer excitons and hetero-intermolecular excitons formed through optical and/or electrical charge transfer in various heterostructures are important quasi-particles for light emission, detection, and harvesting systems.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Liemao Cao, Xiaohui Deng, Zhen-kun Tang, Rui Tan, Yee Sin Ang
Summary: We investigate the interface properties between WSi2N4 and Mo2B, O-modified Mo2B, and OH-modified Mo2B nanosheets. We find that WSi2N4 and Mo2B form n-type Schottky contacts, while functionalizing Mo2B with O and OH leads to the formation of both n-type and p-type ohmic contacts with WSi2N4. Additionally, we demonstrate the emergence of quasi-ohmic contact with ultralow lateral Schottky barrier and zero vertical interfacial tunneling barriers in Mo2B(OH)2-contacted WSi2N4.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Ga Eun Kim, Hae-Jin Kim, Heesuk Jung, Minwoo Park
Summary: This study presents a solution to the commercialization challenges of flexible LEDs based on MAPbBr(3) by incorporating polyurethane and an In-Ga-Zn-Sn liquid alloy. The designed devices showed high flexibility, efficiency, and durability, with improved electron injection and reduced defects, making them promising for next-generation displays.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Tao Shen, Zeng Wu, Zhen Jiang, Dongsheng Yan, Yan Zhao, Yang Wang, Yunqi Liu
Summary: Sidechain engineering is an important molecular design strategy for tuning the solid-state packing and structural ordering of conjugated polymers. The effects of sidechain direction on the optoelectronic properties of polymers and device performance were systematically investigated in this study. The results demonstrate that tuning the sidechain substitution direction can effectively improve the molecular structure and light absorption properties of polymers, providing new insights for the rational design of functional polymers.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Lotte Clinckemalie, Bapi Pradhan, Roel Vanden Brande, Heng Zhang, Jonathan Vandenwijngaerden, Rafikul Ali Saha, Giacomo Romolini, Li Sun, Dirk Vandenbroucke, Mischa Bonn, Hai I. Wang, Elke Debroye
Summary: In this study, a facile strategy using a non-conductive polymer was proposed to fabricate stable, pinhole-free thick films. The effect of introducing a second phase into CsPbBr3 perovskite crystals on their photophysical properties and charge transport was investigated. The dual phase devices exhibited improved stability and more effective operation at higher voltages in X-ray detection.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Jingye Zou, Shenglan Hao, Pascale Gemeiner, Nicolas Guiblin, Omar Ibder, Brahim Dkhil, Charles Paillard
Summary: When rare-earth ions are embedded in a ferroelectric material, their photoluminescence can serve as an all-optical probe for temperature, electric field, and mechanical stimulus. However, the impact of ferroelectric phase transitions on photoluminescence is not well understood. In this study, we demonstrate changes in the photoluminescence of green emission bands during critical ferroelectric transitions in an Er-doped BaTiO3 material. We also find that the intensity ratio and wavelength position difference of sub-peaks provide information on the phase transitions.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Jiangchao Han, Daming Zhou, Wei Yang, Chen Lv, Xinhe Wang, Guodong Wei, Weisheng Zhao, Xiaoyang Lin, Shengbo Sang
Summary: Rare type-II spin-gapless semiconductors (SGSs) have attracted increasing attention due to their unique spin properties. In this study, the interface contacts and spin transport properties of different devices composed of VSi2P4 ferromagnetic layers were investigated. The results show that VSi2P4 is a promising material for designing vertical van der Waals heterostructures with a giant tunnel magnetoresistance (TMR) in spintronic applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Tianqi Zhao, Renagul Abdurahman, Qianting Yang, Ruxiangul Aiwaili, Xue-Bo Yin
Summary: In this study, we designed and prepared Cr and Ba-doped gamma-Ga2O3 nanoparticles to achieve near-infrared emission and enhance the emission intensity. The emission mechanism was proposed based on the trap depth, band gap, and energy levels of Cr ions. The ratiometric temperature sensing and encryption information transfer demonstrated the potential applications of this technology.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Shuvankar Gupta, Jyotirmoy Sau, Manoranjan Kumar, Chandan Mazumdar
Summary: In this study, a new spin-gapless semiconductor material CoFeMnSn is reported, and its stable structure and spin-polarized band structure are determined through experimental realization and theoretical calculations. The compound exhibits a high ferromagnetic transition temperature, making it excellent for room temperature applications. The nearly temperature-independent resistivity, conductivity, and carrier concentration of the compound, adherence to the Slater-Pauling rule, and the high intrinsic anomalous Hall conductivity achieved through hole doping further confirm its spin-gapless semiconductor nature. Additionally, the compound's SGS and topological properties make it suitable for spintronics and magneto-electronics devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Ikumi Aratani, Yoji Horii, Yoshinori Kotani, Hitoshi Osawa, Hajime Tanida, Toshiaki Ina, Takeshi Watanabe, Yohko F. Yano, Akane Mizoguchi, Daisuke Takajo, Takashi Kajiwara
Summary: In this study, two-dimensional arrays of single-molecule magnets (SMMs) based on metal-organic frameworks (MOFs) were systematically modified through Langmuir-Blodgett methods and chemical modifications. The introduction of bulky alkoxide groups induced structural changes and perpendicular magnetic anisotropy. This research provides a promising strategy for the construction of high-density magnetic memory devices using molecular spintronics.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Zonghao Lei, Houhe Dong, Lijie Sun, Bing Teng, Yanfei Zou, Degao Zhong
Summary: Researchers have successfully developed four different up-conversion phosphors based on the Eulytite-type host Ba3Yb(PO4)(3). The optical temperature sensing properties of these phosphors were thoroughly investigated, and it was found that Ba3Yb(PO4)(3):Tm/Er/Ho showed potential for optical temperature measurement applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
C. Roncero-Barrero, M. A. Carvajal, J. Ribas-Arino, I. de P. R. Moreira, M. Deumal
Summary: This study computationally investigates the conductivity of four isostructural compounds with different Se contents, and reveals the parameters that define their conductivity in stable organic radical materials. The results provide insights into the influence of Se content on the conductivity and highlight the importance of considering multiple parameters in understanding the trends in conductivity.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Remi Arras, Kedar Sharma, Lionel Calmels
Summary: In this study, we investigated the interplay between structural defects in NiFe2O4, showing that the complex formed by a Ni-Oh/Fe-Td-cation swap and a neutral oxygen vacancy is more stable than these two isolated defects, and significantly reduces the width of the minority-spin band gap.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)