Nano Energy
·
2025
·
IF 17.1
Zongnuo Sha,Cheng Hu,Shuchen Tu,Tong Li,Fang Chen,Hongwei Huang
Solar catalysis efficiency is severely subject to the insufficient charge separation and inactive surface sites. Building piezoelectric field is established to be effective for anisotropic photocharge separation, and introducing defects can enrich surface reactive sites. However, the relationship between piezoelectric field and surface defect or reaction kinetics remains unclear. Herein, we report piezo-activating oxygen vacancy (OVs) to regulate quantum well effect and p-band center for exceptional photocatalysis in polar BiOIO 3 single crystals. The introduction of piezoelectric field enhances the local charge asymmetry distribution induced by OVs, facilitating electron donating from bulk to surface I atom. Remarkably, the external strain collaborates with OVs to largely reduces the work function of its surface, and induces a larger up-shift of p-band center of I 5p orbitals in BiOIO 3 . It indicates a reduction in the occupancy of antibonding-orbital, facilitating the stabilization of O 2p antibonding states and formation of I-O ads bonds for strong O 2 /H 2 O adsorption. Thus, oxygen-vacant BiOIO 3 achieves a dramatically improved piezo-photocatalytic degradation efficiency towards various pollutants, outperforming the related piezo-photocatalysts in previous reports. This work reveals the mechanism of piezoelectric field on surface vacancy and surface electronic structure at the atomic level.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Xiaoying Bo,Caijie Yang,Bolun Li,Yikang Fan,Jiaoyan Li,Hengming Huang,Jiahui Kou,Chunhua Lu
The photocatalytic O2 reduction to produce H2O2 offers significant environmental benefits. However, its efficiency is hindered by rapid charge recombination and sluggish catalytic kinetics in the catalyst. Traditional elemental doping has been employed to mitigate these issues, but its efficacy is limited as heteroatoms within the bulk often trap charge carriers. To address these challenges, we propose a gradient doping strategy. Unlike uniform doping, gradient doping introduces additional active sites on the catalyst surface. Our engineered gradient Mn-doped CdS photocatalyst demonstrated a remarkable H2O2 generation rate of 1874 μmol g−1 h−1, with an apparent quantum efficiency of 65.2% at 475 nm. The gradient distribution of Mn creates reverse quantum wells within the CdS matrix, which significantly enhances charge extraction from the bulk to the surface. The surface enrichment of Mn not only facilitates the adsorption and activation of O2 but also promotes the formation of the crucial *OOH intermediate, thereby accelerating H2O2 production.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 14
·2300248
·
IF 9
Huayu Wei,Chenlin Wang,Xiaoxiao Li,Heyan Meng,Bingyi Tong,Luxi Li,Xuepeng Zhan,Bing Jin,Baoqing Sun,Yanmin Zong,Xian Zhao,Yuan Gao
Cadmium chalcogenide colloidal quantum wells (CQWs) are a unique class of optical gain materials that can be precisely engineered in terms of thickness and composition at the atomic level using colloidal atomic layer deposition (c-ALD). However, the atomic layer deposition is typically performed at room temperature, resulting in low emission efficiency and the need for additional thermal annealing. In this study, ultraviolet (UV) illumination is used to treat the CQWs prepared using c-ALD and a significant improvement in their photoluminescence is observed, with an irreversible 79-fold increase. Furthermore, the lasing threshold is reduced to two-thirds of the untreated samples, enabling whispering gallery mode lasing from the CQW in solution. This research demonstrates an efficient and convenient method for boosting the emission from the CQWs and highlights the advantages of CQWs as optical gain media that can be engineered with atomic precision.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 17
·8475-8484
·
IF 6.97
Weishuo Xing,Xinsu Zhang,Chong Geng,Yangyang Xie,Yuchen Deng,Peng Li,Huanrong Li,Shu Xu,Wengang Bi
Multi-quantum-well quantum dots (MQW-QDs) with multiple emission peaks have been evaluated as promising single source emitters in the fabrication of high performance white LEDs. However, they still face a critical issue of color shift in practical applications, which is mainly attributed to the redistribution of the excitons between the adjacent wells under different excitation powers. Herein, we report sandwich structural MQW-QDs that provide highly stable dual emission. The study on the optical properties and exciton dynamics reveals that the thickness of the inner-barrier plays a crucial role in balancing the exciton distribution through regulating near-field energy transfer and light absorption between the adjacent wells. Meanwhile, the wells and the outer-barrier mainly influence the luminescence efficiency and the wavelength control of the dual emission peaks. The MQW-QDs with a minimum color shift versus excitation power are finally achieved by optimizing the structure parameters. A white LED based on the developed MQW-QDs exhibits a stable white light spectrum with high tolerance to the change of the excitation power, ensuring the advancement of the performance of MQW-QDs in lighting and display applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE & ENGINEERING R-REPORTS
·
2024
·
IF 31.6
Jie Chen,Zhenzi Li,Haitao Yu,Xiuwen Wang,Ying Xie,Wei Zhou
Interface engineering is vital for promoting charge separation in photocatalysis. Herein, a twin crystal interface in Cd 0.3 Zn 0.7 S is engineered, which leads to a variation of the electric polarization along the interface and the formation of a periodic quantum well along z axis. The periodic quantum well could effectively facilitate the oriented charge separation and significantly reduce the diffusion distance simultaneously. Density functional theory (DFT) calculations confirm that Cd 0.3 Zn 0.7 S twin crystal possesses a relative low work function and an appropriate hydrogen adsorption Gibbs free energy (ΔG H* ), making each step of the cascaded hydrogen evolution reactions optimized. As a result, the resultant twin crystal exhibits an excellent visible light photocatalytic hydrogen evolution rate (13148.98 μmol·g −1 ·h −1 ), which is almost 10 and 30 times higher than those of CdS and ZnS. Importantly, it also shows a good stability because of the formation of twin crystal interface. In addition, the introduction of S vacancy defect results in narrowing the band gap and extending the photo-response to long wavelength region. Such a twin crystal interface engineering strategy provides a basic guideline for designing high-efficient photocatalysts with tunable electric polarization.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yangyang Cai,Siyu Yan,Yue-jian Lin,Tingting Lin,Longzhen Qiu,Xiaoyong Pan,Weizhi Wang
Perovskite has attracted extensive attention in the realm of photovoltaic and light-emitting diodes (LEDs) on account of its outstanding photoelectric properties. Perovskite-type quantum wells (QW) have been developed for high-efficiency perovskite-type LEDs. However, there are few reports on the in situ quantum well structure formed by a bimetallic antiperovskite and its properties. In this work, we report a double/bimetallic antiperovskite composed of magnesium and manganese. It is an in situ homogeneous junction composed of a p-type manganese well layer and an n-type magnesium barrier layer, which promotes the recombination of carriers and increases the luminous efficiency. The in situ quantum wells enable the green antiperovskite LED to have a maximum external quantum efficiency reaching 20.2% and a maximum luminance as high as 19000 cd m–2. These research results provide the chance to produce high-performance LEDs based on an in situ quantum well structure. Meanwhile, the strategy developed in this work is helpful for the design of other highly luminescent lead-free materials.
研究领域:
材料科学
·
光电材料
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Chenlin Wang,Wei Zhang,Haixiao Zhao,Baoqing Sun,Xian Zhao,Dan Luo,Yuan Gao
Circularly polarized light (CPL) is vital for optical communication, quantum information, 3D displays, and bioimaging. Traditional CPL generation using linear polarizers and quarter-wave plates suffers from significant energy loss. Here, we present a chiral vertical-cavity surface-emitting laser (VCSEL) by integrating face-down aligned CdSe/CdZnS colloidal quantum wells (CQWs, also known as nanoplatelets) with a cholesteric liquid crystal (CLC)-based distributed Bragg reflectors (DBRs). The CLC reflectors selectively reflect CPL matching their handedness, enhancing lasing, and ensuring a dominant output of the same handedness. The face-down aligned CQWs offer i) directional emission for precise spectral matching with the CLC-DBR stop band and ii) optimized light-matter coupling via dipole alignment with cavity modes. This leads to a lower lasing threshold and high polarization dissymmetry, achieving a |g-factor| of 1.9. The lasing process further amplifies circular polarization asymmetry, increasing the right-CP ( R -CP) to left-CP ( L -CP) intensity ratio from 0.21 in fluorescence to 41.7 in lasing. Furthermore, we demonstrate flexible chiral VCSELs with mechanically tunable emission wavelengths while maintaining performance. Our approach provides an efficient and customizable strategy for next-generation high-purity CPL sources, paving the way for advanced photonic applications.
研究领域:
光学
·
材料科学
·
量子信息科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2018
·Vol. 30
·期 21
·1707166
·
IF 21.95
Xu Zhang,Rahim Munir,Zhuo Xu,Yucheng Liu,Hsinhan Tsai,Wanyi Nie,Jianbo Li,Tianqi Niu,Detlef-M. Smilgies,Mercouri G. Kanatzidis,Aditya D. Mohite,Kui Zhao,Aram Amassian,Shengzhong (Frank) Liu
Ruddlesden–Popper reduced-dimensional hybrid perovskite (RDP) semiconductors have attracted significant attention recently due to their promising stability and excellent optoelectronic properties. Here, the RDP crystallization mechanism in real time from liquid precursors to the solid film is investigated, and how the phase transition kinetics influences phase purity, quantum well orientation, and photovoltaic performance is revealed. An important template-induced nucleation and growth of the desired (BA) 2 (MA) 3 Pb 4 I 13 phase, which is achieved only via direct crystallization without formation of intermediate phases, is observed. As such, the thermodynamically preferred perpendicular crystal orientation and high phase purity are obtained. At low temperature, the formation of intermediate phases, including PbI 2 crystals and solvate complexes, slows down intercalation of ions and increases nucleation barrier, leading to formation of multiple RDP phases and orientation randomness. These insights enable to obtain high quality (BA) 2 (MA) 3 Pb 4 I 13 films with preferentially perpendicular quantum well orientation, high phase purity, smooth film surface, and improved optoelectronic properties. The resulting devices exhibit high power conversion efficiency of 12.17%. This work should help guide the perovskite community to better control Ruddlesden–Popper perovskite structure and further improve optoelectronic and solar cell devices.
研究领域:
材料科学
·
光伏技术
·
半导体物理
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Guojun Zhou,Yan Xu,Zhiguo Xia
Quasi-two-dimensional perovskite multiple quantum wells (MQWs) have garnered attention on account of their good stability in comparison with three-dimensional analogs for light-emitting diode (LED) applications, but they exhibit a declined photoluminescence quantum yield (PLQY) for the backlight display technology. Herein, we report an in situ process by introducing layered materials as substrates to prepare the perovskite MQW powder and utilize hexagonal boron nitride (h-BN) as an example to investigate the luminescence characteristics and mechanism of h-BN@(PMA)2MAn–1PbnBr3n+1 (h-BN@PMPB). Remarkably, the deposition strategy enables an enhanced PLQY from 2.6 to 32.4%. A synergetic effect of low reabsorption, low defect concentration, and high absorptivity leads to high-efficiency cascade energy transfer and also an improvement in stability. Moreover, the h-BN@PMPB composite powder shows a narrow-band green emission band peaking at 532 nm with a full width at half maximum of 32 nm, and the white LED backlight reaches a wide color gamut 106.1% of the National Television Standards Committee (NTSC). This work reveals a general synthesis method for preparing perovskite powder and paves the way to achieve new solid-state luminescent materials with controlled size and morphology for backlight display applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Kewei Gu,Tingting Wang,Guowei Yang,Nan Yu,Chengchao Du,Junli Wang
Two-dimensional inorganic–organic hybrid layered semiconductors are actively studied because of their naturally formed multiquantum well (MQW) structures and associated optical, photoelectric, and quantum optics characteristics. Silver benzeneselenolate (AgSePh, Ph = C6H5) is a new member of such hybrid layered materials, but has not fully been exploited. Herein, we present a quasi-solution method to prepare high quality free-standing AgSePh flake-like microcrystals by reacting diphenyl diselenide (Ph2Se2) with silver nanoparticles. The resultant AgSePh microflakes exhibit room-temperature (RT) resolvable MQW-induced quasi-particle quantization and interesting optical properties, such as three distinct excitonic resonance absorptions X1 (2.67 eV), X2 (2.71 eV), and X3 (2.83 eV) in the visible region, strong narrow-line width blue photoluminescence at ∼2.64 eV (470 nm) from the radiative recombination of the X1 exciton state, and a large exciton binding energy (∼0.35 eV). Furthermore, AgSePh microcrystals show high stability under water, oxygen, and heat environments, while above 220 °C, they will thermally decompose to silver and Ph2Se2 as evidenced by a combination of thermogravimetry and differential scanning calorimetry and pyrolysis-coupled gas chromatography–mass spectrometry studies. Finally, a comparison is extended between AgSePh and other metal benzeneselenolates, benzenethiolates, and alkanethiolates to clarify differences in their solubility, decomposition/melting temperature, and pyrolytic products.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2021
·Vol. 38
·期 10
·2100120
·
IF 3.31
Jinke Bai,Meilun Zhang,Ruiyao Jiang,Ziming Wu,Linfeng Wang,Xiao Jin,Qinghua Li,Yuxiao Wang,Xueru Zhang,Yinglin Song
Solid-phase color converter-based quantum dots (QDs) white light-emitting diodes (WLEDs) have become promising next-generation solid-state light sources. However, the development of these WLEDs’ production still suffers from constraints involving insufficient color-rendering index (CRI), low color stability, and short operation lifetimes. Here, thick-shell Cd 0.05 Zn 0.95 S/CdSe/Cd x Zn 1– x S spherical quantum wells are developed with good color tunability from green to red regions and high photoluminescence quantum yield (up to 88% for green wavelengths). QDs with five emission colors are used to fabricate a series of WLEDs, which possess a good correlated color temperature tunability from warm (3210 K) to cool (22 000K) white light, and a high CRI Ra (>90). Specifically, the neutral white light device with Commission Internationale de l´Eclairage (CIE, International Commission on illumination) of (0.36, 0.36) and the standard white light device with CIE of (0.33, 0.33) achieve a CRI Ra up to 95.8 and 95.11, respectively, they also exhibit long operating life and great color stability. These results indicate that the improvement of the performance and stability of the WLED based on thick-shell spherical quantum wells is remarkable progress in the commercialization of QD-based solid-state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 35
·期 3
·2208078
·
IF 32.086
Shaocheng Liu,Zhenyu Guo,Xianxin Wu,Xinfeng Liu,Zijian Huang,Liang Li,Jinwen Zhang,Huanping Zhou,Ling-Dong Sun,Chun-Hua Yan
While quasi-two-dimensional (quasi-2D) perovskites have emerged as promising semiconductors for light-emitting diodes (LEDs), the broad-width distribution of quantum wells hinders their efficient energy transfer and electroluminescence performance in blue emission. In particular, the underlying mechanism is closely related to the crystallization kinetics and has yet to be understood. Here for the first time, the influence of bifunctional zwitterions with different coordination affinity on the crystallization kinetics of quasi-2D perovskites is systematically investigated. The zwitterions can coordinate with Pb 2+ and also act as co-spacer organic species in quasi-2D perovskites, which collectively inhibit the aggregation of colloidal precursors and shorten the distance of quantum wells. Consequently, restricted nucleation of high- n phases and promoted growth of low- n phases are achieved with moderately coordinated zwitterions, leading to the final film with a more concentrated n distribution and improved energy transfer efficiency. It thus enables high-efficiency blue LEDs with a recorded external quantum efficiency of 15.6% at 490 nm, and the operation stability has also been prolonged to 55.3 min. These results provide useful directions for tuning the crystallization kinetics of quasi-2D perovskites, which is expected to lead to high-performance perovskite LEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）