Article
Chemistry, Physical
Jiakuan Zhang, Chuyue Li, Jiongzhao Li, Xiaogang Peng
Summary: Size- and shape-controlled CdSe/ZnSe core/shell and CdSe/ZnSe/ZnS core/shell/shell nanocrystals with zinc-blende structure are synthesized. The ligand strain between the inorganic crystal surface and organic ligands plays a key role in ZnSe epitaxy. The lattice strain between the CdSe and ZnSe affects the photoluminescence of CdSe/ZnSe/ZnS core/shell/shell QDs.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shijia Zeng, Zhenbo Li, Wenjiang Tan, Jinhai Si, Yuren Li, Xun Hou
Summary: This study compares the ultrafast carrier dynamics in InP/ZnSe/ZnS core/shell/shell quantum dots (CSS-QDs) and InP/ZnS core/shell QDs (CS-QDs), revealing the impact of the ZnSe midshell on carrier dynamics. The results show that the ZnSe midshell enhances electron delocalization, prolongs the in-band relaxation time of electrons and holes, and reduces defect emissions. Additionally, the ZnSe midshell leads to an increased density of higher-energy hole states, which may decrease the probability of Auger recombination.
Article
Chemistry, Physical
Andrei Mitrofanov, Anatol Prudnikau, Francesco Di Stasio, Nelli Weiss, Rene Huebner, Anna Maria Dominic, Konstantin B. L. Borchert, Vladimir Lesnyak, Alexander Eychmueller
Summary: This study successfully synthesized core/shell NPLs containing 0D CdxHg1-xSe domains in CdSe NPLs, and coated them with a CdyZn1-yS shell while preserving their 2D morphology. The NPLs exhibit bright photoluminescence in the near-infrared range with high quantum yields, making them a promising material for light-emitting applications.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jiakuan Zhang, Jiongzhao Li, Zikang Ye, Jiting Cui, Xiaogang Peng
Summary: This study investigates the photochemical properties of CdSe/ZnSe core-shell quantum dots (QDs) under ambient conditions, showing opposite responses to oxygen and water compared to CdSe/CdS core/shell QDs. The ZnSe shells act as a barrier for electron transfer to surface-adsorbed oxygen but facilitate hot-electron transfer to oxygen. This efficient transfer process competes with relaxation of hot electrons, leading to complete quenching of photoluminescence (PL) and oxidation of surface anion sites. Water partially cancels the photochemical effects of oxygen, while alkylphosphines can stop and recover PL. ZnS outer shells slow down photochemical effects but cannot fully prevent PL quenching by oxygen.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Optics
Xiao Jin, Wenyong Chen, Xiaoying Li, Haichao Guo, Qinghua Li, Zhenghe Zhang, Tingting Zhang, Bing Xu, Dongyu Li, Yinglin Song
Summary: This study introduces device-grade thick-shell CdZnSe/ZnSe/ZnS quantum dots with high PL quantum yield in QD film, which effectively prevents undesired inter-dot energy transfer, preserving their superior emission properties. White light-emitting diodes (WLEDs) integrated with multiple CdZnSe/ZnSe/ZnS QDs cover the visible spectrum and deliver high-quality color rendering index.
JOURNAL OF LUMINESCENCE
(2021)
Article
Chemistry, Physical
Jiajia Ning, Yuan Xiong, Stephen Kershaw, Andrey L. Rogach
Summary: The most efficient way to improve the stability and optical properties of nanocrystals is to grow shell around their cores. Different growth modes of the ZnS shell on ZnSe nanorods were observed depending on the crystal structure of the ZnSe core, leading to differences in photoluminescence quantum yield.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Nyamsuren Byambasuren, Jiyeon Jo, Hyungduk Ko, Byeong-Kwon Ju, Ji Young Byun, Ho Seong Jang
Summary: Blue-light-emitting ZnSe/ZnS C/S QDs were synthesized and studied for their optical and structural properties, showing great potential in blue and white LED applications.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
Bega Karadza, Hannes Van Avermaet, Leila Mingabudinova, Zeger Hens, Youri Meuret
Summary: The use of red InP/ZnSe QDs and traditional powder phosphors in on-chip LED configurations can achieve high-efficiency, high color rendering index (CRI) white LEDs. Although InP/ZnSe QDs have a broader emission linewidth, their impact on spectral efficiency is limited for lighting applications.
PHOTONICS RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Zhiwei Long, Gaoling Yang, Ruiwen Shao, Zhuo Chen, Yang Liu, Ronghui Liu, Haizheng Zhong
Summary: The growth of ZnS shell on ZnSe cores of different sizes is investigated. By controlling the reactivity of Zn and S precursors, the ZnS shell growth can be tuned to defect-related strain-released or defect-free strained mode, resulting in blue and red-shifts of the nanocrystals. The shape of the nanocrystals evolves differently depending on the growth mode, and the strain between the core and shell affects the band alignment and quantum yield.
Article
Chemistry, Physical
Paul Cavanaugh, Ilan Jen-La Plante, Christian Ippen, Ruiqing Ma, David F. Kelley, Anne Myers Kelley
Summary: Resonance Raman spectra and absolute cross sections of InP/ZnSe/ZnS core/shell/shell nanocrystals were obtained at different excitation wavelengths, revealing differences in phonon features attributed to various stoichiometries of the structures. The presence of excess indium in the ZnSe shell was found to influence the Raman intensities and frequency distributions, supporting previous assignments of hole trapping at indium defects in the shell.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Michael J. Enright, Dipti Jasrasaria, Mathilde M. Hanchard, David R. Needell, Megan E. Phelan, Daniel Weinberg, Brinn E. McDowell, Haw-Wen Hsiao, Hamidreza Akbari, Matthew Kottwitz, Maggie M. Potter, Joeson Wong, Jian-Min Zuo, Harry A. Atwater, Eran Rabani, Ralph G. Nuzzo
Summary: The development of bright, near-infrared-emissive quantum dots (QDs) is crucial for various technology applications. This study successfully synthesized bright, near-infrared luminescent InAs/InP/ZnSe QDs using theoretical and experimental approaches. The research identified material attributes and optimized the optical properties of these QDs, resulting in improved emissive qualities. Additionally, the study explored the behavior of charge carriers at the nanoscale and their interaction with interfacial atomic structures.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Review
Optics
Shi-Jie Zou, Xin-Yi Zeng, Yan-Qing Li, Jian-Xin Tang
Summary: WOLEDs, especially SEL-WOLEDs, are considered promising candidates for full-color display and solid-state lighting due to their high efficiency, white color balance, simple fabrication, and large-area manufacturing possibilities. Recent strategies focus on molecular design, energy transfer mechanisms, and combining different emitters to improve device performance in SEL-WOLEDs. Future prospects and technological challenges of SEL-WOLEDs are also discussed.
LASER & PHOTONICS REVIEWS
(2021)
Article
Chemistry, Physical
Peiwen Lv, Xiang An, Zhongyuan Guan, Lijin Wang, Zhiyong Zheng, Xu Li, Zhe Yin, Jinyi Lin, Aiwei Tang
Summary: The combination of inorganic nanocrystals and solution-processed conjugated polymer is an effective strategy to achieve stable and efficient white-light-emitting diodes. By optimizing the device with a new polymer, the maximum external quantum efficiency was increased by 221% while maintaining stable spectrum under high voltage, providing a great foundation for cadmium-free white-light LEDs.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Nayon Park, Forrest W. Eagle, Asher J. DeLarme, Madison Monahan, Talia LoCurto, Ryan Beck, Xiaosong Li, Brandi M. Cossairt
Summary: This study demonstrates fine-tuning of the atomic composition of InP/ZnSe quantum dots at the core/shell interface, affecting their optical properties. Reactive trimethylsilyl reagents were used to shift the nanocrystal stoichiometry, resulting in changes in absorption, excitonic photoluminescence, and trap-based photoluminescence. Time-resolved photoluminescence data suggest that the low photoluminescence quantum yields may be attributed to the creation of new charge trap states and a dark population within the QDs.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Do-Yeong Shin, Taehwan Kim, Ozgun Akyuz, Hilmi Volkan Demir, In-Hwan Lee
Summary: This study presents an improved efficiency design for white LEDs by integrating blue nanorod LEDs with green and red-emitting perovskite nanocrystal films. The design utilizes the localized surface plasmon effect of Ag@SiO2 nanoparticles to enhance the photoluminescence intensity of blue LEDs, while the high-power blue LED backlight improves the perovskite photoluminescence intensity. The resulting white LED with Ag@SiO2 nanoparticle-embedded nanorods demonstrates a 62% increase in photoluminescence intensity compared to planar white LEDs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
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)