ACS Applied Optical Materials最新文献

Interplay between Host Structure, Oxygen Quenching, and Triplet-Triplet Annihilation Upconversion in Hybrid Polymer Hosts. 杂化聚合物寄主结构、氧猝灭和三重湮灭上转换之间的相互作用。

IF 3.8

ACS Applied Optical Materials Pub Date : 2026-04-08 eCollection Date: 2026-04-24 DOI: 10.1021/acsaom.6c00025

Georgina H Burgoyne Morris, Larissa Gomes Franca, Abigail R Collins, Rachel C Evans

{"title":"Interplay between Host Structure, Oxygen Quenching, and Triplet-Triplet Annihilation Upconversion in Hybrid Polymer Hosts.","authors":"Georgina H Burgoyne Morris, Larissa Gomes Franca, Abigail R Collins, Rachel C Evans","doi":"10.1021/acsaom.6c00025","DOIUrl":"https://doi.org/10.1021/acsaom.6c00025","url":null,"abstract":"The ability to convert low-energy photons to those of higher energy through triplet-triplet annihilation upconversion (TTA-UC) is of significant interest for diverse applications including solar energy harvesting, sensing, and anticounterfeiting. However, the efficiency of TTA-UC under ambient conditions is often severely limited due to the quenching of excited triplet states by molecular oxygen. Therefore, when designing TTA-UC systems, it is crucial to effectively characterize the extent of oxygen quenching and to use these insights to drive material design that effectively prevents the permeation of oxygen. In this work, we investigate the oxygen barrier properties of three organic-inorganic hybrid polymers known as ureasils, previously determined to be effective TTA-UC hosts under ambient conditions. Through both direct oxygen permeation measurements and kinetic analysis of the phosphorescence quenching of palladium-(II) octaethylporphyrin (PdOEP), we investigate how the ureasil structure, particularly with respect to silica content and molecular weight and branching of the polymer chains, affects the bulk and local oxygen permeabilities. We also demonstrate the interplay of oxygen quenching with the wider TTA-UC process, confirming that the variation in oxygen permeability is the primary factor affecting ambient TTA-UC efficiency between different ureasil structures. This emphasizes the importance of considering oxygen barrier properties as a key metric in the design of future host materials for more efficient ambient TTA-UC systems.","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"4 4","pages":"1169-1179"},"PeriodicalIF":3.8,"publicationDate":"2026-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13123409/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147783010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polydopamine Nanoparticles as Label-Free Contrast Agents in Photoacoustic Imaging In Vitro and In Vivo. 聚多巴胺纳米颗粒在体外和体内光声成像中的无标记造影剂研究。

IF 3.8

ACS Applied Optical Materials Pub Date : 2026-03-23 eCollection Date: 2026-04-24 DOI: 10.1021/acsaom.5c00637

Matteo Battaglini, Paolo Armanetti, Alessio Carmignani, Claudia Catarinicchia, Valentina Naef, Margherita Montorsi, Marie Celine Lefevre, Claudio Canale, Davide Odino, Luca Menichetti, Filippo Maria Santorelli, Gianni Ciofani

{"title":"Polydopamine Nanoparticles as Label-Free Contrast Agents in Photoacoustic Imaging In Vitro and In Vivo.","authors":"Matteo Battaglini, Paolo Armanetti, Alessio Carmignani, Claudia Catarinicchia, Valentina Naef, Margherita Montorsi, Marie Celine Lefevre, Claudio Canale, Davide Odino, Luca Menichetti, Filippo Maria Santorelli, Gianni Ciofani","doi":"10.1021/acsaom.5c00637","DOIUrl":"https://doi.org/10.1021/acsaom.5c00637","url":null,"abstract":"Polydopamine nanoparticles (PDNPs) are a class of nanomaterials formed by the self-polymerization of dopamine. They exhibit high biocompatibility, biodegradability, antioxidant properties, and ease of functionalization and can serve as photothermal agents when exposed to near-infrared (NIR) light. Another notable feature of PDNPs is their potential to act as contrast agents in photoacoustic imaging (PAI). In this technique, light absorption by endogenous chromophores or nanostructures induces thermal expansion, which generates sound waves that can be exploited to create images. Although PDNPs have shown promise as PAI contrast agents, their capabilities remain underexplored and insufficiently characterized in biological systems. This study presents the first comprehensive evaluation of PDNPs as PAI contrast agents. We investigated PDNPs of various sizes (∼150-1000 nm) and assessed their photoacoustic performance in diverse environments, including aqueous dispersions, ex vivo tissues, U87 cancer cell spheroids, fertilized quail eggs, and zebrafish embryos. Additionally, experimental results supported the development of a computational model to predict PDNP photoacoustic properties. Overall, this work highlights the significant, yet largely unexplored, potential of PDNPs as label-free PAI contrast agents, contributing to their future exploitation in clinical imaging.","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"4 4","pages":"1051-1067"},"PeriodicalIF":3.8,"publicationDate":"2026-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13131747/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147821627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Twisted-Nematic Liquid Crystal-Infiltrated Bilayer Metasurface for Circular-Polarization LCoS Devices. 圆偏振LCoS器件的扭曲向列液晶浸润双层超表面。

IF 3.8

ACS Applied Optical Materials Pub Date : 2026-03-11 eCollection Date: 2026-03-27 DOI: 10.1021/acsaom.5c00640

Xin Chang, He Ma, Mike Pivnenko, Weijie Wu, Yayan Tan, Jin Li, Daping Chu

{"title":"Twisted-Nematic Liquid Crystal-Infiltrated Bilayer Metasurface for Circular-Polarization LCoS Devices.","authors":"Xin Chang, He Ma, Mike Pivnenko, Weijie Wu, Yayan Tan, Jin Li, Daping Chu","doi":"10.1021/acsaom.5c00640","DOIUrl":"https://doi.org/10.1021/acsaom.5c00640","url":null,"abstract":"Optical chirality underpins applications ranging from molecular identification to facial recognition. Metasurfaces have recently emerged as a versatile platform for compact chiral photonic devices. Here, we demonstrate electrically tunable circular dichroism (CD) at telecommunication wavelengths using a bilayer metasurface integrated with a twisted nematic liquid crystal (TN LC). The device comprises two silicon cuboid metasurface layers rotated by 30° relative to each other, with the interlayer gap filled by TN LC. The LC alignment was experimentally verified, confirming an effective metasurface-induced director orientation. Numerical simulations predict a maximum CD of 0.47 at 1575 nm, while experiments reveal an electrically tunable CD switching (ΔCD) of 8.2% at 1550 nm. This discrepancy is primarily attributed to lateral misalignment between the bilayer metasurfaces, as confirmed by numerical simulations. This architecture provides a practical route to extend conventional liquid crystal on silicon (LCoS) devices, typically designed for linearly polarized (LP) light, toward circular polarization-based LCoS (CP LCoS) devices, enabling opportunities for applications such as biomedical imaging and smart glasses.","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"4 3","pages":"848-854"},"PeriodicalIF":3.8,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13036765/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147595206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigations on Organic Push-Pull Dyes for Luminescent Solar Concentrator Applications. 有机推拉染料在发光太阳能聚光器中的应用研究。

IF 3.8

ACS Applied Optical Materials Pub Date : 2026-02-20 eCollection Date: 2026-03-27 DOI: 10.1021/acsaom.5c00605

Roberto Bondi, Antonino Arrigo, Ejdi Cela, Luigi Vaccaro, Assunta Marrocchi, Francesco Marchini, Anna Laura Pisello, Francesco Nastasi, Loredana Latterini

{"title":"Investigations on Organic Push-Pull Dyes for Luminescent Solar Concentrator Applications.","authors":"Roberto Bondi, Antonino Arrigo, Ejdi Cela, Luigi Vaccaro, Assunta Marrocchi, Francesco Marchini, Anna Laura Pisello, Francesco Nastasi, Loredana Latterini","doi":"10.1021/acsaom.5c00605","DOIUrl":"https://doi.org/10.1021/acsaom.5c00605","url":null,"abstract":"In recent years, the focus on luminescent solar concentrator (LSC) materials has been renewed thanks to their properties that support their integration into PV technologies in buildings and in the urban environment. In this work, three dyes bearing push-pull units and presenting anthracene (compound 1) or 2,1,3-benzothiadiazole (BTZ-P6t, compound 2, and TBTZ-P12t, compound 3) as the central chromophore module are investigated as luminophores for the LSCs based on polyacrylate. The optical and luminescence characterization of the dyes in solution and in polyacrylate panels has been carried out to examine the impact of medium polarity and stiffening on the photophysical behavior of the dyes. The photoluminescence quantum yield (PLQY), decay times, and radiative and nonradiative rate constants have been evaluated together with the overlap integral to rationalize the reabsorption phenomena. The photophysical parameters highlight that medium polarity and matrix stiffening have an impact on the photoluminescence properties. The evaluation of the photovoltaic performance, performed by placing an edge of dye panels in contact with a silicon PV device, shows that the panels act as LSCs. In particular, compound 3 exhibits the highest value of PLQY (81%), resulting in the highest value of PV light-to-energy conversion efficiencies (ηopt%, 2.8%). This study proposes a thorough and correlated examination of the photophysical characteristics of molecular systems when the media are switched from solution to acrylate panels in order to rationalize the photovoltaic performance of the prepared LSCs. Although the prepared dye-acrylate panels fall outside accepted standard dimensions for LSC size, this study is relevant to designing chromophore architecture for enhanced efficiencies for LSCs.","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"4 3","pages":"775-784"},"PeriodicalIF":3.8,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13036777/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147595287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis, Properties, and Applications of Morphology-Controlled Perovskite Quantum Dots. 形态控制钙钛矿量子点的合成、性质及应用。

IF 3.8

ACS Applied Optical Materials Pub Date : 2026-02-09 eCollection Date: 2026-02-27 DOI: 10.1021/acsaom.5c00607

Matthew L Atteberry, Chenjia Mi, Sohom Chandra, Sania Fiaz, Yitong Dong

{"title":"Synthesis, Properties, and Applications of Morphology-Controlled Perovskite Quantum Dots.","authors":"Matthew L Atteberry, Chenjia Mi, Sohom Chandra, Sania Fiaz, Yitong Dong","doi":"10.1021/acsaom.5c00607","DOIUrl":"https://doi.org/10.1021/acsaom.5c00607","url":null,"abstract":"Lead halide perovskite quantum dots (QDs) have become a promising class of nanomaterials due to their simple, scalable synthesis and high luminescence efficiency. However, their high ionicity and low lattice formation energy make controlling the synthesis of perovskite QDs particularly challenging. Although there have been significant advances in controlling the size of perovskite QDs, increasing efforts have focused on selecting and stabilizing their various surface facets. In this review, we examine recent developments in morphology-controlled isotropic perovskite QDs, emphasizing the latest techniques for managing surface facet exposure, facet passivation, and the optical and chemical properties of these QDs. We also explore future challenges and opportunities for precise synthesis control, especially regarding shape control of strongly confined QDs, which is vital for understanding the relationship between structure and propertiesultimately improving the performance and stability of perovskite QD-based optoelectronic devices and photocatalysts.","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"4 2","pages":"278-292"},"PeriodicalIF":3.8,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12954849/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147356646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Controlled Growth of Rare-Earth-Doped TiO₂ Thin Films on III-V Semiconductors for Hybrid Quantum Photonic Interfaces. 稀土掺杂TiO2薄膜在III-V型半导体杂化量子光子界面上的控制生长。

IF 3.8

ACS Applied Optical Materials Pub Date : 2026-02-04 eCollection Date: 2026-02-27 DOI: 10.1021/acsaom.5c00585

Henry C Hammer, Caleb Whittier, Nathan A Helvy, Christopher Rouleau, Nabil D Bassim, Ravitej Uppu

{"title":"Controlled Growth of Rare-Earth-Doped TiO2 Thin Films on III-V Semiconductors for Hybrid Quantum Photonic Interfaces.","authors":"Henry C Hammer, Caleb Whittier, Nathan A Helvy, Christopher Rouleau, Nabil D Bassim, Ravitej Uppu","doi":"10.1021/acsaom.5c00585","DOIUrl":"https://doi.org/10.1021/acsaom.5c00585","url":null,"abstract":"Quantum photonic networks require two distinct functionalities: bright single-photon sources and long-lived quantum memories. III-V semiconductor quantum dots (QDs) excel as deterministic and coherent photon emitters, while rare-earth ions such as erbium (Er3+) in crystalline oxides offer exceptional spin and optical coherence at telecom wavelengths. Combining these systems and their functionalities via direct epitaxy is challenging due to lattice mismatch and incompatible growth conditions. Here, we demonstrate the low-temperature pulsed laser deposition of Er3+-doped TiO2 thin films directly on GaAs and GaSb substrates. Controlled surface preparation with an arsenic cap and an oxygen-deficient buffer layer enables the growth of epitaxial anatase TiO2 (001) at ∼390 °C with sub-300 pm surface roughness, while avoiding interface degradation. In contrast, high-temperature oxide desorption or growth temperatures drive the transition to a rough, polycrystalline rutile film, as confirmed by transmission electron microscopy. Minimal coincident interface area (MCIA) modeling explains the orientation-selective growth on GaAs and GaSb. Raman and cryogenic photoluminescence excitation spectroscopy verify the crystal phase and optical activation of Er3+ ions. This multiparameter growth strategy helps preserve III-V quantum dot functionality and yields smooth surfaces suitable for low-loss nanophotonic structures. Our results establish a materials platform for monolithically integrating rare-earth quantum memories with semiconductor photon sources, paving the way toward scalable hybrid quantum photonic chips.","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"4 2","pages":"457-470"},"PeriodicalIF":3.8,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12954842/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147356678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gallium Oxide-Based Photodetectors for Water Quality Monitoring. 用于水质监测的氧化镓光电探测器。

IF 3.8

ACS Applied Optical Materials Pub Date : 2026-02-04 eCollection Date: 2026-02-27 DOI: 10.1021/acsaom.5c00620

David Nicol, Aurora Uras, Nathalie Lidgi-Guigui, William J Peveler, Núria Martínez-Carreras, Fabien C P Massabuau

{"title":"Gallium Oxide-Based Photodetectors for Water Quality Monitoring.","authors":"David Nicol, Aurora Uras, Nathalie Lidgi-Guigui, William J Peveler, Núria Martínez-Carreras, Fabien C P Massabuau","doi":"10.1021/acsaom.5c00620","DOIUrl":"https://doi.org/10.1021/acsaom.5c00620","url":null,"abstract":"We present an approach to water quality monitoring using gallium oxide (Ga2O3) ultrawide-band-gap semiconductors. Nitrates, dissolved organic carbon, and suspended solid concentrations are three commonly measured water quality parameters that display optical absorption ranging from the deep ultraviolet to the visible region. This broad spectral region poses a challenge for accurate and efficient (simultaneous) measurement of absorption/extinction arising from varying concentrations of these parameters because silicon (Si), the classical detector material, has poor performance across this optical region. To overcome these limitations, we propose the use of ultrawide-band-gap semiconductors to trace changes in optical absorption from varying water compositions by measuring the photocurrent response at different wavelengths. Here, we use α-phase Ga2O3 as a suitable material to measure a broad photocurrent response ranging from 200 to 465 nm. The photocurrent response consisted of three well-defined regions inherently linked to the rich electronic landscape of the material. Region (i) (200-250 nm) corresponds to band-to-band excitation of charge carriers, aligning well with the absorption characteristics of nitrates. Region (ii) (250-350 nm) corresponds to band tail-related transitions, allowing a photocurrent response to dissolved organic carbon concentrations. Finally, we utilize defect-mediated transitions in Region (iii) (350-465 nm) to monitor suspended solid concentrations. It was observed here that the sensitivity of the photocurrent response to the changing water composition strongly depends on the excitation wavelength, where 225, 260, and 465 nm excitation yielded (for our setup) the best results for the monitoring of nitrates, dissolved organic carbon, and suspended solid concentrations, respectively.","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"4 2","pages":"547-552"},"PeriodicalIF":3.8,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12954839/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147356656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ellipsometric Identification of Transition from a Layered Metal-Dielectric Film to a Hyperbolic Metamaterial. 从层状金属介电膜到双曲型超材料过渡的椭圆偏振识别。

IF 3.8

ACS Applied Optical Materials Pub Date : 2026-01-12 eCollection Date: 2026-01-23 DOI: 10.1021/acsaom.5c00534

Samhita Kattekola, Vinod M Menon, Alexander Couzis, Ilona Kretzschmar

{"title":"Ellipsometric Identification of Transition from a Layered Metal-Dielectric Film to a Hyperbolic Metamaterial.","authors":"Samhita Kattekola, Vinod M Menon, Alexander Couzis, Ilona Kretzschmar","doi":"10.1021/acsaom.5c00534","DOIUrl":"https://doi.org/10.1021/acsaom.5c00534","url":null,"abstract":"Hyperbolic metamaterials (HMMs) continue to be intriguing due to their applications in super-resolution imaging and spontaneous emission control. One of the successful realizations of HMMs is a layered metal-dielectric film. Despite the extensive knowledge in thin-film technology and the promises of HMM's applications, the scale-up and practical utilization of HMMs have not yet occurred. A general design approach is needed to predict the transition of a layered structure into an HMM. In this work, effective medium theory and the transfer matrix method are combined to determine the transition and validated by spectroscopic ellipsometry measurements on a predefined HMM structure made of silver and alumina. Four interdependent design parameters are explored: thicknesses of metal and dielectric layers, transition wavelength, and the minimum number of periods required for a layered metal-dielectric film to display hyperbolic dispersion. The findings are presented as a practical engineering design chart, similar to a state diagram, which can be extended to other combinations of materials.","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"4 1","pages":"217-226"},"PeriodicalIF":3.8,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12836358/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146094343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrafast Exciton Dynamics in Few-Layer MoTe₂ near the Direct-Indirect Bandgap Transition. 直接-间接带隙跃迁附近少层MoTe2的超快激子动力学。

IF 3.8

ACS Applied Optical Materials Pub Date : 2026-01-03 eCollection Date: 2026-01-23 DOI: 10.1021/acsaom.5c00475

Robert Hamburger, Thomas F Theiner, Ben M Garland, David J Hynek, Elifnaz Önder, Judy J Cha, Nicholas C Strandwitz, Elizabeth R Young

{"title":"Ultrafast Exciton Dynamics in Few-Layer MoTe2 near the Direct-Indirect Bandgap Transition.","authors":"Robert Hamburger, Thomas F Theiner, Ben M Garland, David J Hynek, Elifnaz Önder, Judy J Cha, Nicholas C Strandwitz, Elizabeth R Young","doi":"10.1021/acsaom.5c00475","DOIUrl":"https://doi.org/10.1021/acsaom.5c00475","url":null,"abstract":"Transition metal dichalcogenides (TMDs) are of interest for a variety of material applications ranging from optoelectronics to quantum computing. The 2H semiconducting phase of MoTe2 is promising as a material for optical devices, such as photodiodes and photovoltaics. The photophysics of such films as their thickness approaches the direct-to-indirect bandgap transition remains underexplored. Leveraging ultrathin film MoTe2 samples fabricated through a combination of atomic layer deposition (ALD) and chemical vapor deposition (CVD), time-resolved optical spectroscopy was employed to quantify charge carrier kinetics as a function of sample thickness. Samples with thicknesses ranging from several monolayers down to a bilayer were examined. A model mechanism is proposed that includes the fast relaxation and rapid formation of an excitonic state. The excitonic state decays through a combination of thermal relaxation through faster bulk defect trap states and slower surface trap states. The surface trapping decay slowed as the sample thickness increased. The results indicate that both bulk and surface trapping play important roles in carrier lifetimes. Consideration for and control of defect states at interfaces has implications for charge injection and transport across interfaces and is critical for implementing MoTe2 layers into heterojunction optical devices.","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"4 1","pages":"83-91"},"PeriodicalIF":3.8,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12836359/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146093850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shell-Free CuInS₂ Nanocrystals with Near-Unity Photoluminescence for Deep-Red LEDs. 具有近统一光致发光的无壳CuInS2纳米晶体用于深红色led。

IF 3.8

ACS Applied Optical Materials Pub Date : 2025-12-22 eCollection Date: 2026-01-23 DOI: 10.1021/acsaom.5c00499

Spyros Orfanoudakis, Panagiotis Dallas, Nikolaos Zacharopoulos, Polychronis Tsipas, Alexandros Banis, Leonidas Tsetseris, Athanassios G Kontos, Thomas Stergiopoulos

{"title":"Shell-Free CuInS2 Nanocrystals with Near-Unity Photoluminescence for Deep-Red LEDs.","authors":"Spyros Orfanoudakis, Panagiotis Dallas, Nikolaos Zacharopoulos, Polychronis Tsipas, Alexandros Banis, Leonidas Tsetseris, Athanassios G Kontos, Thomas Stergiopoulos","doi":"10.1021/acsaom.5c00499","DOIUrl":"https://doi.org/10.1021/acsaom.5c00499","url":null,"abstract":"CuInS2 quantum dots (CIS-QDs) are promising nontoxic and air-stable materials that can be readily synthesized through a controllable heat-up reaction between metal cation precursors and a sulfur source, enabling tunable photoluminescence (PL) across the visible to near-infrared range. However, their broader application in light-emitting diodes (LEDs) is limited by inefficient radiative recombination and a photoluminescence quantum yield (PLQY) significantly below unity. To address this challenge, we introduce formamidinium acetate (FAAc) into the reactiona common additive in metal halide perovskite precursor solutions. FAAc modulates precursor chemistry by forming complexes that control the size and bandgap of the resulting nanocrystals, without significantly altering their crystal structure. We also find that FAAc regulates the stoichiometry, inducing substantial Cu-(I) deficiency and a corresponding decrease in the lattice work function. These effects, combined with the potential passivation of surface defects by nitrogen-containing byproducts of FAAc decomposition, contribute to a dramatic enhancement of PLQY, from 43% to 94%, and an increase in PL lifetime from 0.2 to 7.2 μs. Proof-of-concept LED devices incorporating FAAc-modified CIS-QDs exhibit bright red emission, demonstrating FAAc as an effective additive for engineering the electroluminescence of CIS-QDs. We propose that this strategy could be extended to other ternary quantum dots to enable high-performance optoelectronic applications.","PeriodicalId":29803,"journal":{"name":"ACS Applied Optical Materials","volume":"4 1","pages":"140-147"},"PeriodicalIF":3.8,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12836342/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146093509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0