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Masthead: (Advanced Optical Materials 28/2024) 刊头:(先进光学材料 28/2024)
IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-04 DOI: 10.1002/adom.202470088
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引用次数: 0
Pulsed-Laser Deposition of Ge-Doped BiTe Nanofilms and Their Application in Room-Temperature Long-Wave Infrared Photodetection (Advanced Optical Materials 28/2024) 脉冲激光沉积掺杂 Ge 的 BiTe 纳米薄膜及其在室温长波红外光探测中的应用(先进光学材料 28/2024)
IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-04 DOI: 10.1002/adom.202470087
Wan Wang, Ximiao Wang, Jiandong Yao, Huanjun Chen, Guowei Yang

Pulsed-Laser Deposition of Ge-Doped BiTe Nanofilms for Photodetection

Pulsed-laser deposition is developed for the large-area synthesis of Ge-doped BiTe nanofilms, which are successfully exploited for room-temperature high-speed long-wave infrared photodetection and optical communications. For more information on these achievements, see article number 2401937 by Jiandong Yao, Huanjun Chen, and co-workers.

用于光探测的脉冲激光沉积掺杂 Ge 的 BiTe 纳米薄膜开发了脉冲激光沉积技术,用于大面积合成掺杂 Ge 的 BiTe 纳米薄膜,并成功地将其用于室温高速长波红外光探测和光通信。有关这些成果的更多信息,请参阅姚建东、陈焕军及合作者的 2401937 号文章。
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引用次数: 0
UV­B Persistent Luminescence of CaF2:Gd3+ for Radiation Labeling and Tracing 用于辐射标记和追踪的 CaF2:Gd3+ 的 UVB 持久发光
IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-03 DOI: 10.1002/adom.202401320
Wenting Zhao, Leipeng Li, Tao Li, Jianrong Qiu, Yanmin Yang

Persistent luminescence (PersL) has attracted considerable attention in the last two decades for its potential applications in the fields of emergency indicators, energy-saving lighting, biomedical imaging, and dynamic anti-counterfeiting. However, the wavelengths of PersL reported so far usually fall into the visible and near-infrared range. The preparation of advanced optical materials bearing UV PersL remains elusive. Here the PersL characteristic of CaF2:Gd3+ is systematically studied. After exposure to X-ray radiation, CaF2:Gd3+ continues to emit UV­-B (UVB) PersL peaking at 313 nm, corresponding to the 6P7/28S7/2 transition of Gd3+. By virtue of X-ray photoelectron spectroscopy measurements, the valence variation model is excluded to explain the UVB PersL of CaF2:Gd3+. Finally, it is demonstrated that such UVB PersL of CaF2:Gd3+ can be used for static labeling and dynamic tracing.

过去二十年来,持久发光(PersL)因其在应急指示、节能照明、生物医学成像和动态防伪等领域的潜在应用而备受关注。然而,迄今报道的 PersL 波长通常属于可见光和近红外波段。制备具有紫外 PersL 的先进光学材料仍是一个难题。本文对 CaF2:Gd3+ 的 PersL 特性进行了系统研究。暴露于 X 射线辐射后,CaF2:Gd3+ 会继续发射紫外线-B(UVB)PersL,峰值在 313 nm 处,与 Gd3+ 的 6P7/2 → 8S7/2 转变相对应。通过 X 射线光电子能谱测量,排除了价变模型对 CaF2:Gd3+ UVB PersL 的解释。最后,研究证明这种 CaF2:Gd3+ 的 UVB PersL 可用于静态标记和动态追踪。
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引用次数: 0
Self-Assembled Biconvex Microlens Array Using Chiral Ferroelectric Nematic Liquid Crystals 利用手性铁电向列液晶自组装双凸透镜阵列
IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-30 DOI: 10.1002/adom.202401507
Kelum Perera, Arwa Alyami, Alex Adaka, Md Sakhawat H. Himel, Nilanthi Haputhanthrige, Oleg D. Lavrentovich, Elizabeth Mann, Antal Jákli

Recently, it is shown (Popov et al, Sci. Rep, 2017, 7, 1603) that chiral nematic liquid crystal films adopt biconvex lens shapes underwater, which may explain the formation of insect eyes, but restrict their practical application. Here it is demonstrated that chiral ferroelectric nematic liquid crystals, where the ferroelectric polarization aligns parallel to the air interface, can spontaneously form biconvex lens arrays in air when suspended in submillimeter-size grids. Using Digital Holographic Microscopy, it is shown that the lens has a paraboloid shape and the curvature radius at the center decreases with increasing chiral dopant concentration, i.e., with decreasing helical pitch. Simultaneous measurements of the imaging properties of the lenses show the focal length depends on the pitch, thus offering tunability. The physical mechanism of formation of the self-assembled ferroelectric nematic microlenses is also discussed.

最近的研究表明(Popov 等人,Sci. Rep, 2017, 7, 1603),手性向列液晶膜在水下呈现双凸透镜形状,这或许可以解释昆虫眼睛的形成,但却限制了其实际应用。本文证明,手性铁电向列液晶的铁电极化平行于空气界面,当悬浮在亚毫米大小的网格中时,可在空气中自发形成双凸透镜阵列。利用数字全息显微镜可以看到,透镜呈抛物面形状,中心的曲率半径随着手性掺杂浓度的增加而减小,即随着螺旋间距的减小而减小。对透镜成像特性的同步测量表明,焦距取决于螺距,从而提供了可调谐性。此外,还讨论了自组装铁电向列微透镜形成的物理机制。
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引用次数: 0
Role of Inter-Particle Connectivity in the Photo-Carrier Cooling Dynamics in Perovskite Quantum Dot Solids 粒子间连通性在包晶量子点固体光载流子冷却动力学中的作用
IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-28 DOI: 10.1002/adom.202401483
David O. Tiede, Katherine A. Koch, Carlos Romero-Pérez, K. Burak Ucer, Mauricio E. Calvo, Juan F. Galisteo-López, Hernán Míguez, Ajay Ram Srimath Kandada

Intraband carrier relaxation in quantum dots (QDs) has been a subject of extensive spectroscopic investigation for several decades, and have been used to optimize the efficiency of opto-electronic processes. In the past few years, metal halide perovskites-based QDs have been shown to exhibit slow hot-carrier cooling characteristics that are desirable for photo-energy harvesting technologies. While several mechanisms are proposed to rationalize the retardation of the cooling dynamics, including hot-phonon bottleneck and polaronic effects, the role of inter-particle connectivity in these dynamics is largely ignored. Here, an in-depth study of photo-excitation dynamics and carrier cooling on perovskite QD solids with varying degrees of inter-dot coupling is presented. It is observed that inter-particle connectivity has deterministic effects on the many-body interactions that are relevant for carrier cooling. These include carrier–carrier interactions that result in Auger-reheating of the carriers, and lattice characteristics that subsequently affect the phonon-assisted cooling dynamics. This spectroscopic study of ultrafast carrier dynamics in perovskite QD solids establishes inter-dot separation as a critical material design parameter for the optimization of photo-generated carrier temperature, which fundamentally determines the luminescence characteristics and thus the opto-electronic quality of the material.

几十年来,量子点(QDs)中的带内载流子弛豫一直是光谱学广泛研究的课题,并被用于优化光电子过程的效率。在过去几年中,基于金属卤化物过氧化物的量子点已被证明具有缓慢的热载流子冷却特性,这是光能收集技术所需要的。虽然人们提出了几种机制来解释冷却动力学的延迟,包括热声子瓶颈和极化效应,但粒子间的连通性在这些动力学中的作用在很大程度上被忽略了。本文介绍了对具有不同程度点间耦合的包晶QD固体的光激发动力学和载流子冷却的深入研究。研究发现,粒子间的连通性会对与载流子冷却相关的多体相互作用产生确定性影响。其中包括导致载流子欧杰再加热的载流子-载流子相互作用,以及随后影响声子辅助冷却动力学的晶格特性。这项对包晶石 QD 固体中超高速载流子动力学的光谱学研究确定了点间分离是优化光生载流子温度的关键材料设计参数,它从根本上决定了材料的发光特性,进而决定了材料的光电子质量。
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引用次数: 0
Achieve Full-Color Emission in Multiple States through Reversible B←N Bond Formation and Multiple Configuration Transitions of a Single Fluorophore 通过单一荧光团的可逆 B←N 键形成和多重构型转换实现多态全彩发射
IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-28 DOI: 10.1002/adom.202401445
Yitong Sun, Xueqi Cai, Wenjie He, Xinyu Ji, Liyan Zheng, Yonggang Shi, Qiue Cao

Multifunctional molecular switches have attracted much attention because of their unique stimulus response behavior and advanced applications. However, precise regulation of the structure for property enrichment is still a great challenge. Herein, the first case of a single-molecule switch BN-S with multiple structurally tunable and full-color fluorescent properties is reported. Interestingly, BN-S exhibits a butterfly-like “metamorphosis” crystal growth process accompanied by full-color fluorescence emission (including white light, CIE = 0.33, 0.33; 456 nm → 610 nm). It is shown that this is related to the reversible B←N bonding and the tunability of the spatial structure of the BN-S. Thus, BN-S exhibits superior multicolor tunability in different states (solid, liquid, and film), and its applications in white-light optical light emitting diodes (OLEDs) and multicolor fluorescent inks also show great promise. This will provide a new strategy for designing and synthesizing the development of multifunctional molecular switching materials and enriching the variety of organoboron luminescent materials.

多功能分子开关因其独特的刺激响应行为和先进的应用而备受关注。然而,如何精确调控结构以丰富特性仍是一个巨大的挑战。本文首次报道了具有多种结构可调和全彩荧光特性的单分子开关 BN-S。有趣的是,BN-S 在全色荧光发射(包括白光,CIE = 0.33,0.33;456 nm → 610 nm)的同时,呈现出类似蝴蝶 "蜕变 "的晶体生长过程。研究表明,这与 BN-S 的可逆 B←N 键和空间结构的可调性有关。因此,BN-S 在不同状态(固体、液体和薄膜)下都表现出卓越的多色可调性,其在白光光学发光二极管(OLED)和多色荧光油墨中的应用也大有可为。这将为设计和合成开发多功能分子开关材料提供新的策略,并丰富有机硼发光材料的种类。
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引用次数: 0
Understanding the Size-Dependent Photostability and Photoluminescence Intermittency of Blue-Emitting Core/Graded Alloy/Shell “giant”-Quantum Dots 了解蓝色发光核/梯度合金/壳 "巨型 "量子点的尺寸相关光稳定性和光致发光间歇性
IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-27 DOI: 10.1002/adom.202401132
Rahul Singh, NVS Praneeth, Subarna Biswas, Manoj Palabathuni, Anandu Muralidharan, Nimai Mishra, Saumyakanti Khatua

Recently, giant quantum dots (g-QDs) with a core/interface graded alloy shell/shell structure have shown promise in reducing photoluminescence (PL) intermittency and improving photostability. However, this approach has been mainly demonstrated with red and green emitting g-QDs but the blue-emitting graded alloy QDs has remained less explored. To tackle this challenge, a composition gradient method is employed to create three blue-emitting CdZnS/CdxZn1–xS/ZnS core/interface graded alloy shell/shell (C/A/S) quantum dots (QDs) with different diameters. The sample with the largest diameter (gQD-3) exhibits superior optical characteristics, with a photoluminescence quantum yield (PLQY) of approximately 62% and around 80% ON/radiative events at the single-particle level. Conversely, the smallest diameter (gQD-1) sample shows lower PLQY and only 30% radiative events with longer OFF/nonradiative events. Probability distribution analysis of PL trajectories, fitted with a truncated power law, reveals a significantly higher carrier de-trapping rate in gQD-3 compared to gQD-1, attributed to its proximity to band edge trap states. Additionally, the largest diameter sample retains remarkable optical performance during 48 h of continuous UV irradiation in colloidal suspension and single-particle levels. These findings show optimized core/shell structures, gradual alloy interfaces, and outer shell coatings can stabilize blue-emitting quantum dots, advancing next-gen optoelectronics.

最近,具有内核/表面分级合金壳/外壳结构的巨量子点(g-QDs)在减少光致发光(PL)间歇性和提高光稳定性方面显示出了前景。然而,这种方法主要在红色和绿色发光 g-QDs 上得到了验证,但对蓝色发光分级合金 QDs 的探索仍然较少。为了应对这一挑战,我们采用了一种成分梯度法来制备三种不同直径的蓝色发光 CdZnS/CdxZn1-xS/ZnS 内核/界面梯度合金壳/外壳(C/A/S)量子点(QDs)。直径最大的样品(gQD-3)具有优异的光学特性,光致发光量子产率(PLQY)约为 62%,单粒子水平的导通/辐射事件约为 80%。相反,最小直径(gQD-1)样品的光量子产率较低,只有 30% 的辐射事件,关断/非辐射事件较长。用截断幂律拟合的 PL 轨迹概率分布分析表明,与 gQD-1 相比,gQD-3 的载流子脱阱率明显更高,这归因于它接近带边阱态。此外,在胶体悬浮液和单颗粒水平上,最大直径的样品在连续紫外线照射 48 小时后仍能保持出色的光学性能。这些研究结果表明,优化的核/壳结构、渐进的合金界面和外壳涂层可以稳定蓝色发光量子点,从而推动下一代光电子技术的发展。
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引用次数: 0
Pressure-Regulated Photovoltaic Response in Antimony Triiodide With Asymmetric Metal Contact 具有不对称金属接触的三碘化锑的压力调节光伏响应
IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-24 DOI: 10.1002/adom.202401433
Shengyang Xing, Shuxin Chen, Sixue Fang, Fuyu Tian, Zonglun Li, Xilian Jin, Quanjun Li, Bingbing Liu

The effective modification of photovoltaic activities in photoelectric devices is significant for enhancing energy conversion efficiency. Here, the pressure-tunable photovoltaic properties in the SbI3 device with Au/Pt asymmetric electrodes are demonstrated. At initial pressure, the SbI3 device exhibits an anticipated self-driven photoresponse characteristic at zero external bias, and a significant enhancement in photocurrent response is observed with increasing bias to −0.2 V, nearly two orders of magnitude higher than the initial value. With increasing pressure, the SbI3 device exhibits tunable photocurrent response, reaching a maximum value at ≈1.2 GPa, while the photovoltage response decreases monotonously during compression, which is closely associated with the dynamic evolution of the work function and bandgap of SbI3 upon successive compression. These findings signify that SbI3 is a promising candidate for future photoelectric devices, which opens a new window of opportunity for further exploration, regulation, and understanding of high-performance photovoltaic devices under extreme conditions.

有效改变光电器件中的光电活性对提高能量转换效率意义重大。本文展示了带有金/铂不对称电极的 SbI3 器件的压力可调光伏特性。在初始压力下,SbI3 器件在零外部偏压时表现出预期的自驱动光响应特性,随着偏压增加到 -0.2 V,光电流响应显著增强,比初始值高出近两个数量级。随着压力的增加,SbI3 器件表现出可调的光电流响应,在 ≈1.2 GPa 时达到最大值,而光电电压响应在压缩过程中单调下降,这与连续压缩时 SbI3 的功函数和带隙的动态演化密切相关。这些发现表明,SbI3 是未来光电器件的理想候选材料,为进一步探索、调节和理解极端条件下的高性能光电器件打开了一扇新的机遇之窗。
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引用次数: 0
Laterally Modulating Carrier Concentration by Ion Irradiation in CdO Thin Films for Mid-IR Plasmonics 通过离子辐照横向调节氧化镉薄膜中的载流子浓度,实现中红外等离子体技术
IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-24 DOI: 10.1002/adom.202401009
Angela J. Cleri, Mingze He, Maxwell J. Tolchin, Christopher Gubbin, Eric Lang, Khalid Hattar, Simone De Liberato, Joshua D. Caldwell, Jon-Paul Maria

This report demonstrates tunable carrier densities in CdO thin films through local ion irradiation, providing lateral control of mid-IR optical properties. Ion-solid interactions produce donor-like defects that boost electron concentrations from the practical minimum of 2.5 × 1019 cm−3 to a maximum of 2.5 × 1020 cm−3 by metered ion exposure. This range is achieved using He, N, Ar, or Au ions at 1–2.8 MeV; when normalized by displacements per atom, all ion species produce comparable results. Since CdO is well-described by the Drude model, irradiation-tuned carrier densities directly alter the infrared dielectric function, and in turn, mid-infrared optical properties. Further, it is demonstrated that by combining irradiation with traditional lithography, CdO films expose to ions in the presence of 3-µm thick, patterned photoresist exhibit lateral carrier density profiles with ≈400-nm resolution. Scanning near-field optical microscopy reveals sharp optical interfaces with almost no companion contrast in surface morphology, microstructure, or crystallinity. Finally, CdO lateral homostructures supporting surface plasmon polaritons (SPPs) are demonstrated whose dispersion relation can be tuned through periodic patterning in a monolithic platform by simple nanofabrication. Numerical simulations show these polaritons result from strong coupling between excitations at CdO plasma frequencies and SPPs supported by the platinum substrate.

本报告展示了通过局部离子辐照实现氧化镉薄膜中载流子密度的可调,从而对中红外光学特性进行横向控制。通过计量离子照射,离子-固体相互作用产生的供体样缺陷可将电子浓度从实际最低的 2.5 × 1019 cm-3 提高到最高的 2.5 × 1020 cm-3。使用 1-2.8 MeV 的 He、N、Ar 或 Au 离子可以达到这个范围;如果按每个原子的位移进行归一化,所有离子种类产生的结果相当。由于德鲁德模型很好地描述了氧化镉,辐照调谐载流子密度直接改变了红外介电函数,进而改变了中红外光学特性。此外,研究还证明,通过将辐照与传统光刻技术相结合,在 3 微米厚的图案化光刻胶存在下暴露于离子的氧化镉薄膜会呈现出分辨率≈400 纳米的横向载流子密度曲线。扫描近场光学显微镜显示出清晰的光学界面,表面形态、微观结构或结晶度几乎没有伴生对比。最后,还展示了支持表面等离子体极化子(SPPs)的氧化镉横向同质结构,其色散关系可通过简单的纳米制造在单片平台上进行周期性图案化调整。数值模拟显示,这些极化子是氧化镉等离子频率的激发与铂基底支持的 SPP 之间的强耦合产生的。
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引用次数: 0
Photoconvertible and Photoactivatable Perylene BisImide Based on Photocyclization 基于光环化的可光电转换和光活化的亚珀尔二酰亚胺
IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-24 DOI: 10.1002/adom.202401511
Valentine Le Berruyer, Aurelie Perrier, Mayeul Collot

Photomodulable fluorophores constitute advanced materials as they possess the ability to modify their photophysical properties upon photoirradiation. A new mechanism of photoconversion is recently established, called Directed Photooxidation Induced Conversion based on the coupling of fluorophores with Aromatic Singlet oxygen Reactive Moieties (ASORMs). In this work, The Directed Photooxidation Induced Conversion (DPIC) mechanism is intended to be applied to Perylene BisImide (PBI) due to its appealing photophysical properties. The experimental results showed that coupling two ASORMs to the PBI core, here furan and pyrrole, led to impressive photomodulable fluorophores. While PBI-F exhibited a photoconversion of 100 nm shift, PBI-P displayed an 80-fold fluorescence intensity enhancement upon photoactivation. Analysis of the photoproducts showed that the conversion do not involve an addition of singlet oxygen on the ASORM. Instead, photoconversion occurred through efficient successive photocyclizations. Finally, intracellular vesicles are successfully photoconverted by means of endocytosed PLGA-polymer nanoparticles loaded with PBI-F. This study highlights the unique capability of furan- and pyrrole-conjugated fluorophores to enable advanced optical materials with phototransformation properties.

可进行光调节的荧光团是一种先进的材料,因为它们具有在光照射下改变其光物理性质的能力。最近建立了一种新的光电转换机制,称为定向光氧化诱导转换(Directed Photooxidation Induced Conversion),其基础是荧光团与芳香族单线态氧活性分子(ASORMs)的耦合。在这项研究中,定向光氧化诱导转化(DPIC)机制因其具有吸引人的光物理特性而打算应用于二亚甲基双酰胺(PBI)。实验结果表明,将两种 ASORM(呋喃和吡咯)耦合到 PBI 核心上,可产生令人印象深刻的光调制荧光团。PBI-F 显示出 100 纳米位移的光电转换,而 PBI-P 则在光激活时显示出 80 倍的荧光强度增强。对光产物的分析表明,这种转换并不涉及在 ASORM 上添加单线态氧。相反,光转化是通过高效的连续光环化作用实现的。最后,通过内吞载入 PBI-F 的 PLGA 聚合物纳米颗粒,细胞内囊泡成功实现了光转化。这项研究凸显了呋喃和吡咯共轭荧光团的独特能力,使其成为具有光转化特性的先进光学材料。
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引用次数: 0
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Advanced Optical Materials
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