JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Yanni Jie,Zengbo Fan,Jiang Yan,Fuchun Li,Ting Meng,Zhenli Guo,Penggao Dai
Carbon dots (CDs) with room-temperature phosphorescence (RTP) characteristics have drawn considerable attention because of their broad applications in various area. However, achieving water-soluble RTP CDs remains highly challenging owing to the severe phosphorescence quenching effect caused by dissolved oxygen in aqueous solutions. Herein, a realizable strategy of attaining long-lifetime and high stability RTP CDs-based composites in aqueous solutions is proposed via constructing a rigid hydrogen-bonded network. The synthesized composites display an ultra-long phosphorescence lifetime of 1.38 s in solid state and 316 ms in aqueous phase. Moreover, the RTP emission remains visible to naked eye for up to 10 s even under strongly acidic or alkaline conditions. TEM, XRD, FT-IR, and XPS analyses confirmed the successful conjugation of cyanuric acid (CA) with carbon dots (CDs) which the rigid CA framework effectively restricted the chromophore vibrations and rotations, minimizing non-radiative recombination of triplet excitons. Finally, applications of CDs in screen printing, anti-counterfeiting and information protection were explored.
研究领域:
材料科学
·
纳米技术
·
光学材料
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2014
·Vol. 17
·期 1
·21-27
·
IF 1.508
Kuo Jiang,Songbai Liu
Graphical Metastable tetragonal (t′) ZrO 2 stabilized with 4 mol% Yb 2 O 3 sinters more slowly and has a higher resistance to destabilization than YSZ with the same composition (4 mol% Y 2 O 3 ). The improved phase stability is attributed to the slower diffusion of the smaller Yb 3+ ion in t′ phase compared to the larger Y 3+ ion. In addition, the TEC of 4 mol% Yb 2 O 3 -stabilized ZrO 2 is also found to be superior to that of YSZ, suggesting practical possibility for thermal barrier coatings.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-8
·
IF 5.578
Li Shuying,Sun Zongzhao,Li Rui,Dong Minmin,Zhang Liyan,Qi Wei,Zhang Xuelin,Wang Hua
Multicolor ZnO quantum dots (QDs) were synthesized and further modified with hydrophobic hexadecyltrimethoxysilane (HDS) and then hydrophilic aminopropyltriethoxysilane (APS) bilayers, resulting in amine-functionalized ZnO@HDS@APS nanocomposites with tunable fluorescence from blue to green yellow. Systematic investigations verify that the resulting ZnO@HDS@APS could display extremely high stability in aqueous media and unexpectedly, dramatically-enhanced fluorescence intensities, which are about 10-fold higher than those of bare ZnO QDs. The feasibility of the as-prepared ZnO nanocomposites for blood, cell and tissue imaging was preliminarily demonstrated, promising the wide bio-applications for cell or tissue imaging, proteome analysis, drug delivery and molecular labeling.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hui Li,Xiaotao Hao,Bohong Chang,Zihao Li,Lian Wang,Lu Pan,Xihan Chen,Longwei Yin
Inorganic CsPbI2Br perovskites have witnessed incredible advances as a promising representative for translucent and tandem solar cells, but unfortunately, they are still plagued by serious energy losses and undesired phase instability. Herein, a new type of π-conjugated small molecule of 4-guanidinobenzoic-acid-hydrochloride (4-GBACl) is demonstrated to effectively cross-link the Pb-X framework of perovskites. The strong coordination between 4-GBACl and the [PbX6]4– octahedron of perovskites effectively stiffens the Pb-X framework to suppress the ion migration, thus stabilizing the perovskite phase structure against light and thermal conditions. Apart from the physical barrier for phase instability resulting from the hydrophobic benzene ring at grain boundaries (GBs), guanidinium cations and −COOH and Cl– groups can simultaneously afford the passivation of positively and negatively charged defects at the GBs and surface, including undercoordinated halide species and undercoordinated Pb2+ ions, thereby effectively inhibiting the charge trapping/recombination centers. Two-dimensional confocal-fluorescence mapping images provide a visualized sight into the significantly suppressed nonradiative recombination and the prolonged carrier lifetime. It is suggested that the 4-GBACl additive plays multiple roles in grain cross-linking to regulate crystallization, distinctly reducing the trap-state density, ion migration inhibition, and moisture barrier in CsPbI2Br films. Consequently, the 4-GBACl-treated device exhibits a champion power conversion efficiency (PCE) of 15.59% accompanied with a considerably improved Voc of 1.28 V and maintains 88% of the initial PCE value after 1200 h aging under 20% relative humidity.
研究领域:
材料科学
·
太阳能电池研究
✓ 已验证
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 16
·165402
·
IF 3.399
Xiaojie Ni,Lei Lei,Yu Yu,Junjie Xie,Ming Li,Songwang Yang,Mei Wang,Jiandang Liu,Hongjun Zhang,Bangjiao Ye
Pristine and Br-doped H2N = CHNH2Pb(I1−xBrx)3 (FAPb(I1−xBrx)3, Br content x = 0, 0.05, 0.15, 0.2, 0.3, and 0.4) films were prepared. The effect of Br-doping on phase stability, defect density, and performance of FAPb(I1−xBrx)3 was investigated by x-ray diffraction (XRD), scanning electron microscopy, ultraviolet–visible–near infrared absorbance spectroscopy, x-ray photoemission spectroscopy (XPS), Kelvin probe force microscopy (KPFM), positron annihilation spectroscopy, and current density–voltage (J–V) characteristics. The XRD measurements exhibit the enhancement of perovskite phase stability at x = 0.05. However, the phase stability decreases gradually with Br content (x) over 0.05. The increase of Br-doping content leads to the downshifting of both valence band (VB) position (indicated by XPS) and Fermi level (illustrated by KPFM). The energy level shifts are most probably due to the increase of Br 4p orbital content in VB and the change of self-doping levels. Doppler broadening spectra of positron annihilation radiation of the samples reveal that, the defect densities of Br-doped samples are much lower than that of pristine FAPbI3. For FAPb(I0.95Br0.05)3 sample, a high photoelectric conversion efficiency of 17.12% (25.7% higher than that of undoped sample) is successfully achieved. The significant enhancement of photoelectric conversion efficiency realized by Br-doping is attributed to the improvement of morphology, high phase stability, and low defect densities.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
·
IF 6.019
Zhenzhen Guo,Zihe Chen,Zhuoxun Shi,Jingwen Qian,Jinhua Li,Tao Mei,Jianying Wang,Xianbao Wang,Ping Shen
Solar vapor generation provides an ideal pathway for water remediation by using abundant natural resource--solar irradiation. Great progresses have been made in increasing solar steam efficiency by macrostructure design and microscopic morphology regulation. Here, we report a stable 1T phase engineering of molybdenum disulfide (MoS 2 ) for enhanced solar vapor generation. A flower-like 1T/2H MoS 2 (1T/2H FMoS 2 ) was developed by a simple one-step hydrothermal method . The 1T/2H FMoS 2 showed enhanced broadband sunlight absorption covering solar spectrum from 300 to 2500 nm. A high evaporation rate of 1.52 kg m −2 h −1 and 20% increase of the photo-to-heat conversion efficiency compared to that of only 2H MoS 2 were achieved for 1T/2H FMoS 2 by introducing 1T phase and a hierarchical flower-like structure. More importantly, the 1T/2H FMoS 2 possessed benign phase stability with a high phase conversion temperature 253 °C. As a photothermal material, it provides an ideal solar-receiver for high efficient solar clean water generation, to alleviate drinking water crisis and energy risk.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Jinshuang Wang,Junbin Sun,Qiangshan Jing,Bing Liu,Hao Zhang,Yu Yongsheng,Jieyan Yuan,Shujuan Dong,Xin Zhou,Xueqiang Cao
The properties of ZrO 2 co-stabilized by CeO 2 and TiO 2 ceramic bulks were investigated for potential thermal barrier coating (TBC) applications. Results showed that the (Ce 0.15 Ti x )Zr 0.85-x O7 (x = 0.05, 0.10, 0.15) compositions with single tetragonal phase were more stable than the traditional 8YSZ at 1573 K. These compositions also showed a large thermal expansion coefficient (TEC) and a high fracture toughness, which were comparable to those of YSZ. However, the phase stability, fracture toughness and sintering resistance of the CeO 2 -TiO 2 -ZrO 2 system showed a decline tendency with the increase of TiO 2 content. The TEC of the ceramic bulks decreased with increase of TiO 2 content as well because the crystal energy was enhanced with increasing substitution of Zr 4+ by smaller Ti 4+ . The (Ce 0.15 Ti 0.05 )Zr 0.8 O 2 had the best comprehensive properties among the (Ce 0.15 Ti x )Zr 0.85-x O 2 compositions as well as a low thermal conductivity . Therefore, it can be explored as a TBC candidate material for high-temperature applications.
研究领域:
材料科学
·
热力学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 50
·2005246
·
IF 11.459
Qiufeng Ye,Fei Ma,Yang Zhao,Shiqi Yu,Zema Chu,Pingqi Gao,Xingwang Zhang,Jingbi You
Cesium lead iodide (CsPbI 3 ) perovskite has gained great attention due to its potential thermal stability and appropriate bandgap ( ≈ 1.73 eV) for tandem cells. However, the moisture-induced thermodynamically unstable phase and large open-circuit voltage ( V OC ) deficit and also the low efficiency seriously limit its further development. Herein, long chain phenylethylammonium (PEA) is utilized into CsPbI 3 perovskite to stabilize the orthorhombic black perovskite phase (γ-CsPbI 3 ) under ambient condition. Furthermore, the moderate lead acetate (Pb(OAc) 2 ) is controlled to combine with phenylethylammonium iodide to form the 2D perovskite, which can dramatically suppress the charge recombination in CsPbI 3 . Unprecedentedly, the resulted CsPbI 3 solar cells achieve a 17% power conversion efficiency with a record V OC of 1.33 V, the V OC deficit is only 0.38 V, which is close to those in organic-inorganic perovskite solar cells (PSCs). Meanwhile, the PEA modified device maintains 94% of its initial efficiency after exceeding 2000 h of storage in the low-humidity controlled environment without encapsulation.
研究领域:
材料科学
·
光伏技术
·
能源研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 6
·2214
·
IF 3.4
Junzhan Zhang,Shangyi Liu,Zhifeng Tian,Ying Zhang,Zongmo Shi
High entropy perovskite oxides (HEPOs) were a class of advanced ceramic materials, which had attracted much scientific attention in recent years. However, the effect of factors affecting the phase stability of high entropy perovskite oxides was still controversial. Herein, 17 kinds of A-site HEPOs were synthesized by solid-state methods, and several criteria for the formation of HEPOs and phase stability were investigated. Single-phase solid solutions were synthesized in 12 kinds of subsystems. The results show that the phase stability of a single-phase solid solution was affected by the size disorder and configurational entropy. The electronegativity difference was the key parameter to predict the evolution of the cubic/tetragonal phase, rather than the tolerance factor. Cubic HEPOs were easily formed when the electronegativity difference was <0.4, while the tetragonal HEPOs were easily formed when the electronegativity difference was ≥0.4. This study can further broaden the family of HEPOs and is expected to design the phase stability of HEPOs through electronegativity difference.
研究领域:
材料科学
·
陶瓷材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LIQUID CRYSTALS
·
2016
·
IF 2.244
Dingqian Shi,Kun Hu,Pei Chen,Weisong Du,Aiai Gao,Ran Chen,Xinbing Chen,Zhongwei An
A series of nematic heterocyclic liquid crystals, 2-(2ʹ-fluoro-4ʹ-alkoxy-1,1ʹ-biphenyl-4-yl)-benzoxazole derivatives (coded as nPF(2)PBx) bearing hydrogen (nPF(2)PBH), methyl (nPF(2)PBM) and nitro (nPF(2)PBN) terminal groups, respectively, are developped and investigated. The results show that the nematic mesophase stability is obviously improved via a slightly increase in the inter-ring twist angle between the planes of two phenyl rings in the biphenyl unit, where modification of the twist angle can be achieved by adjusting the position of the lateral monofluorine substituent from the outer to the inter ring of the biphenyl mesogenic core unit. Meanwhile, the inter-ring lateral fluorine substituent results in a decrease in both melting and clearing points but only a nematic mesophase with an acceptably wide mesophase range for nPF(2)PBx, and thus a potential application in liquid crystal display mixtures is expected, especially for the compounds nPF(2)PBM and nPF(2)PBN. The reduced π–π interaction/conjugation caused by the increased twist angle is considered as one of the possible reasons for the formation of a nematic mesophase.
研究领域:
材料科学
·
液晶化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Rui Wang,Chenyu Shang,Qiqi Zhao,Qi Huang,Chenyang Liu,Wenli Xu,Rui Liu,Weiwei Zhang,Jianxu Ding
Cubic α-CsPbI3 is recognized as one of the most promising semiconductors for optoelectronic applications owing to its suitable band gap, excellent optoelectronic performance, and thermal stability. However, its phase instability from α to δ poses a significant obstacle for practical applications. How to stabilize α-CsPbI3 becomes a paramount issue. Here, we propose a strategy in which α-CsPbI3 nanocrystals (NCs) are in situ generated in the Cs4PbI6 single-crystal (SC) matrix through I ion migration, facilitated by its ultralow activation energy (0.104 eV). The existence of the I vacancy can promote ion migration and can increase the content of α-CsPbI3. As α-CsPbI3 NCs are generated in situ, the light yellow Cs4PbI6 SCs convert to black. The lattice of Cs4PbI6 twines outside of α-CsPbI3 NCs without a grain boundary and restricts the migration of I and Cs within the α-CsPbI3 lattice. This mechanism effectively stabilizes α-CsPbI3 for over 2 years without experiencing a phase transition. Such stable α-CsPbI3 NCs exhibit deep red emission (700 nm), a high exciton binding energy (55.5 meV), and a long carrier lifetime (176.9 ns). Furthermore, annealing at 320 °C for 12 h did not result in any damage. Additionally, white-light-emitting diodes (WLEDs) were fabricated using black Cs4PbI6 SCs and yellow phosphor YAG:Ce3+ under an atmospheric environment and realized white emission. The WLEDs maintain approximately 86% luminescence after 18 days or under continuous operation for 12 h, demonstrating high stability and eliminating the need for short-wavelength blue chips. Overall, the α-CsPbI3 NCs deviating from Cs4PbI6 SCs offer an approach to realize highly efficient light-emitting diode applications.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2021
·
IF 4.076
Haochen Ye,Yucheng Liu,Yunxia Zhang,Zhuo Xu,Jiaxue You,Lili Gao,Bing Li,Zhou Yang,Bobo Zhang,Shengzhong Frank Liu
Halide-composition engineering has been recognized as an effective means to stabilize formamidine (FA)-based perovskite (FAPbI3) in thin-film devices. However, the influence of a halide mixture on the lattice strain, trap density, carrier lifetime, and phase stability remains unclear. Herein, FAPbBrxI3–x single crystals (SCs) are grown as a model to study how halide composition would affect the inner strain and the optoelectronic properties. It is found that by gradually increasing the Br/I ratio from 0:1 to 1:0, the inner strain can be regulated. X-ray diffraction results show excellent phase stability of FAPbBrxI3–x SCs (stable in an ambient atmosphere over 1.5 years when x ≥ 0.5) because of the released expansion stress in the cubic lattice. The relevant photodetector presents good performance with an on–off ratio exceeding 103, a dark current as low as 10–10 A, a linear dynamic range (LDR) of 111 dB, detectivity of 4 × 1011 Jones, and long-term photostability. The present work paves a path toward the design of high-quality devices based on composition-optimized FAPbBrxI3–x SCs with predictable optoelectronic properties.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）