Advanced Optical Materials最新文献_第5页

Trackable Electronic Deception Enabled by Space-Time Coding Metasurface 通过时空编码元表面实现可跟踪电子欺骗

IF 8 2区材料科学

Advanced Optical Materials Pub Date : 2024-09-17 DOI: 10.1002/adom.202401353

Xiang Wan, Wen Hao Wang, Jia Wei Wang, Xu Jie Wang, Jia Chen Wan, Zhanye Chen, Yinghui Quan, Tie Jun Cui

{"title":"Trackable Electronic Deception Enabled by Space-Time Coding Metasurface","authors":"Xiang Wan, Wen Hao Wang, Jia Wei Wang, Xu Jie Wang, Jia Chen Wan, Zhanye Chen, Yinghui Quan, Tie Jun Cui","doi":"10.1002/adom.202401353","DOIUrl":"10.1002/adom.202401353","url":null,"abstract":"Space-time coding metasurfaces (STCMs) have gained a great deal of achievements in the fields of radar and communication, but they have rarely been explored in the field of electronic jamming. The existing researches use time-varying surface or phase-switched screens to realize electronic deceptions, but the deceptions are completely passive and are limited in the time-frequency domain. Here, a mechanism of STCM-based deceptions is presented in the space and the time-frequency domains, and precise designs of the STCM-based deceptions are achieved by performing shifting operations on the space-time coding sequences of the STCM. Moreover, STCM-based DOA (direction-of-arrival) estimation is integrated with the deception procedure to achieve trackable electronic deception which cannot be realized by completely passive electronic jamming. A prototype system of the STCM-based deception is built to verify the deception performance, and the experimental results agree well with the numerical simulations. This work extends the research and the applications of the STCMs, hence showing great scientific and engineering significance.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"12 30","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142251147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Real-Time Detection of Coherent Vibrational Dynamics in TiN Films 实时检测 TiN 薄膜中的相干振动动态

IF 8 2区材料科学

Advanced Optical Materials Pub Date : 2024-09-17 DOI: 10.1002/adom.202401390

Andrea Iudica, Silvia Rotta Loria, Cristina Mancarella, Luca Mascaretti, Alberto Naldoni, Giulio Cerullo, Andrea Li Bassi, Margherita Zavelani-Rossi

{"title":"Real-Time Detection of Coherent Vibrational Dynamics in TiN Films","authors":"Andrea Iudica, Silvia Rotta Loria, Cristina Mancarella, Luca Mascaretti, Alberto Naldoni, Giulio Cerullo, Andrea Li Bassi, Margherita Zavelani-Rossi","doi":"10.1002/adom.202401390","DOIUrl":"10.1002/adom.202401390","url":null,"abstract":"Titanium nitride (TiN) has recently gained considerable interest because of its remarkable plasmonic properties and for its strong electron–phonon (e–ph) coupling, leading to extremely fast (<100 fs) electron-lattice cooling. Here, the generation of coherent phonons in TiN films is reported, along with their real-time detection by means of broadband transient reflection spectroscopy with sub-15-fs temporal resolution. The measurements show damped oscillations, superimposed to excited state electronic decay. A coherent vibrational mode is revealed, with ≈10 THz frequency ascribed to defect-activated normal modes, consistent with spontaneous Raman scattering data, and a dephasing time of ≈250 fs. Two π-phase flips are also observed located at photon energies corresponding to interband optical transitions (at 3.2 and 2.5 eV), ascribed to selective coupling of the vibrational mode to these transitions; the energy modulation induced by the vibrational coherence is evaluated. It is shown that the displacive excitation of coherent phonons model describes the coherent response in terms of temporal behavior and of spectral amplitude profile. Overall, a comprehensive and detailed analysis of coherent phonons in TiN films, so far undected, is provided and relevant information on TiN photo-physical properties, potentially useful for its applications, is given.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"12 30","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adom.202401390","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142251142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bidirectionally Regulated Ultraviolet and Visible Dual-Band Photoresponse Characteristics of Self-Powered BiOI/WO3 Photodetectors 自供电 BiOI/WO3 光电探测器的双向调节紫外线和可见光双波段光响应特性

IF 8 2区材料科学

Advanced Optical Materials Pub Date : 2024-09-17 DOI: 10.1002/adom.202401244

Fan Liu, Jianping Xu, Shaobo Shi, Jia Li, Chengning Pang, Lina Kong, Xiaosong Zhang, Lan Li

{"title":"Bidirectionally Regulated Ultraviolet and Visible Dual-Band Photoresponse Characteristics of Self-Powered BiOI/WO3 Photodetectors","authors":"Fan Liu, Jianping Xu, Shaobo Shi, Jia Li, Chengning Pang, Lina Kong, Xiaosong Zhang, Lan Li","doi":"10.1002/adom.202401244","DOIUrl":"10.1002/adom.202401244","url":null,"abstract":"Images captured in inadequate illumination or uneven brightness conditions are prone to suffer from loss of detail and reduced contrast. Self-powered BiOI/WO3 heterojunction PDs with bidirectionally regulated ultraviolet (UV) and visible dual-band photoresponse characteristics can help to solve the problems. By varying the growth time of BiOI nanoflakes (NFs) on WO3 nanorod arrays (NRs), different stoichiometric ratios and crystal and band structures of BiOI are achieved. The I− ions migration inside the BiOI controlled by applying a pre-bias voltage can induce the accumulation of polarized charges at the heterojunction interface, then alter the width of the depletion region as well as the height of the interface barrier, which in turn affects the dynamics of photo-generated carriers. Upon applying a positive (negative) pre-bias, the self-powered photocurrent decreases (increases) in the UV band, whereas increases (decreases) in the visible band. Based on BiOI/WO3 heterojunction PDs, a machine vision imaging system is designed, which enhances image contrast and detail in strong and weak light conditions. This system facilitates rapid feature extraction and recognition, advancing the development of intelligent, real-time digital machine vision systems.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"12 30","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142251151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing Performance in Top‐Illuminated Shortwave Infrared Organic Photodetectors via Microcavity Resonance 通过微腔共振提高顶部发光短波红外有机光电探测器的性能

IF 9 2区材料科学

Advanced Optical Materials Pub Date : 2024-09-17 DOI: 10.1002/adom.202401806

Ping‐Yen Chen, Gajendra Suthar, Yu‐Yang Su, Chung‐Wei Hsu, Kuen‐Wei Tsai, Cheng‐En Tsai, Chih‐Wei Chu, Fang‐Chung Chen, Yi‐Ming Chang

{"title":"Enhancing Performance in Top‐Illuminated Shortwave Infrared Organic Photodetectors via Microcavity Resonance","authors":"Ping‐Yen Chen, Gajendra Suthar, Yu‐Yang Su, Chung‐Wei Hsu, Kuen‐Wei Tsai, Cheng‐En Tsai, Chih‐Wei Chu, Fang‐Chung Chen, Yi‐Ming Chang","doi":"10.1002/adom.202401806","DOIUrl":"https://doi.org/10.1002/adom.202401806","url":null,"abstract":"Shortwave infrared (SWIR) image sensors have unique functions in many optical applications, leading to widespread attention in developing next‐generation materials and photodetector technologies. Organic photodetectors (OPDs) are highly promising due to their flexibility in molecular design and processability. However, integrating OPDs with silicon readout integrated circuits (ROICs) poses numerous challenges, often resulting in underestimated device performance and limiting technological progress. To address the requirements of integrating top‐illuminated OPD with ROICs and to enhance the external quantum efficiency (EQE), optical microcavities are introduced into the OPDs. The EQE in the SWIR region can be effectively enhanced by properly adjusting the thicknesses of the photoactive layer (PAL) and interlayers. Simulations of the optical field distribution further support the active functions of the microcavity structure. The spatial variation of the microcavities allows the spectral response to shift from 1000 to 1400 nm, and the optimized device achieves an EQE of 25.8% at 1260 nm. Finally, the OPDs are integrated with a silicon‐based test kit, and the results reveal comparable sensing performance, demonstrating the high potential of microcavity resonance for device integration. This design effectively improves the integration of OPDs with traditional ROICs and advances SWIR‐based organic image sensor technology further toward commercialization.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"14 1","pages":""},"PeriodicalIF":9.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142251146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vertically Stacked Broadband GNIF-MoS2/p-Ge Photodetector for Dark Current Suppression, High Photoresponse, and Ultrafast Transient Response 垂直叠加宽带 GNIF-MoS2/p-Ge光电探测器，实现暗电流抑制、高光响应和超快瞬态响应

IF 8 2区材料科学

Advanced Optical Materials Pub Date : 2024-09-17 DOI: 10.1002/adom.202401363

Rajiv Kumar Pandey, Hwayong Choi, Young-Hoon Kim, Subin Jeong, Yeji Kim, Junseok Heo

{"title":"Vertically Stacked Broadband GNIF-MoS2/p-Ge Photodetector for Dark Current Suppression, High Photoresponse, and Ultrafast Transient Response","authors":"Rajiv Kumar Pandey, Hwayong Choi, Young-Hoon Kim, Subin Jeong, Yeji Kim, Junseok Heo","doi":"10.1002/adom.202401363","DOIUrl":"10.1002/adom.202401363","url":null,"abstract":"The proposed model structure, featuring a gold (Au) nano-island film (GNIF) integrated with a vertically stacked van der Waals heterojunction and offering an elegant platform for high-performance, efficient, and sensitive photodetection across a broad spectral range, is designated as GNIF-MoS₂/p-Ge(MoS2 = Molybdenum disulfide, p-Ge = p type germanium). The GNIF is fabricated via ultrathin film deposition, based on the surface dewetting properties of MoS2. The as-fabricated photodetector (PD), offering ≈20 times reduction in dark current and characterized by wavelength-dependent high responsivity (R(λ)), photoconductive gain (G(λ)), and detectivity (D(λ)), respond to a broad spectral range from visible light (400 nm) to short wave infrared (SWIR) (1600 nm). The ultrahigh transient response (τr) is found to be ≈2.5 and 16 µs for the 470 (visible light) and 1550 (SWIR) nm wavelengths, respectively, resulting in 3-dB bandwidths of up to ≈48 kHz, which is considered high for such devices. To understand the inherent mechanisms of broadband detection and the high photoresponse and ultrafast transient response of PDs, a meticulous investigation is conducted on the wavelength-dependent behaviors, depletion width changes, and material properties. The results provide valuable insights and a basis for the construction of suitable PDs based on nanometer-thin metal films, 2D semiconductors, and a 3D hybrid structure.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"12 31","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142251144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aqueous Afterglow Dispersion Enabling On‐Site Ratiometric Sensing of Mercury Ions 水性余辉弥散可实现汞离子的现场比率测量传感

IF 9 2区材料科学

Advanced Optical Materials Pub Date : 2024-09-17 DOI: 10.1002/adom.202401509

Minjuan Cai, Wuzhen Luo, Feiming Li, Shunyou Cai, Guangqiang Yin, Tao Chen, Zhixiong Cai

{"title":"Aqueous Afterglow Dispersion Enabling On‐Site Ratiometric Sensing of Mercury Ions","authors":"Minjuan Cai, Wuzhen Luo, Feiming Li, Shunyou Cai, Guangqiang Yin, Tao Chen, Zhixiong Cai","doi":"10.1002/adom.202401509","DOIUrl":"https://doi.org/10.1002/adom.202401509","url":null,"abstract":"Pollution caused by heavy metal ions has become a global issue owing to their severe threat to the ecological environment and human health. However, it remains a considerable challenge to detect heavy metal ions in an efficient, selective, and high signal‐to‐noise ratio way. Herein, a portable and sensitive method is presented to probe Hg2+ by using an ultralong afterglow dispersion. The in situ encapsulation of phosphorescent carbon dots (CDs) within rigid hydrogen‐bonded organic frameworks (HOFs) leads to ultralong room temperature phosphorescence (RTP) in water with a maximum lifetime of up to 974.86 ms. Moreover, the resultant CDs@HOFs material exhibits robust and long‐term RTP emission with enhanced performance under strongly acidic or alkaline conditions, which contributes to the practical detection of Hg2+ in water. As such, an efficient and sensitive afterglow probe is facilely fabricated by integrating CDs@HOFs with a Hg2+ probe Rhodamine B derivative (RhBTh), demonstrating selective sensing of Hg2+ with greatly improved signal‐to‐noise ratios based on the triplet‐singlet Förster resonance energy transfer system (TS‐FRET). This work not only provides a reliable and versatile method for realizing robust RTP emission in water, but also expands the applications of afterglow materials in the field of optical sensing of toxic analytes.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"65 1","pages":""},"PeriodicalIF":9.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142251154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of Donor and Acceptor Modification on TADF and Roll‐Off Behaviors in Solution Processed OLED 供体和受体修饰对溶液加工型有机发光二极管中 TADF 和滚降行为的影响

IF 9 2区材料科学

Advanced Optical Materials Pub Date : 2024-09-17 DOI: 10.1002/adom.202401881

Hee Tae Yang, Ye Ji Hyeon, Thi Na Le, Ji Eun Lee, Yun‐Hi Kim, Min Chul Suh

{"title":"Impact of Donor and Acceptor Modification on TADF and Roll‐Off Behaviors in Solution Processed OLED","authors":"Hee Tae Yang, Ye Ji Hyeon, Thi Na Le, Ji Eun Lee, Yun‐Hi Kim, Min Chul Suh","doi":"10.1002/adom.202401881","DOIUrl":"https://doi.org/10.1002/adom.202401881","url":null,"abstract":"Up‐conversion of triplet into singlet exciton in the emitting layer is believed to be one of the ways that thermally activated delayed fluorescent (TADF) materials may employ to reduce triplet exciton density hence preventing device quenching by triplet excitons. Yet, two donor‐acceptor type molecules; 5‐(4‐(4,6‐diphenyl‐1,3,5‐triazin‐2‐yl)phenyl)‐12‐(3‐(triphenylsilyl) phenyl)‐5,12‐dihydroindolo[3,2‐a]carbazole (SiPhCzTrz) and 5‐phenyl‐12‐(4‐(4‐phenyl‐6‐(3‐(triphenylsilyl) phenyl)‐1,3,5‐triazin‐2‐yl)pheny‐l)‐5,12‐dihydroindolo [3,2‐a]carbazole (SiTrzPhCz), which exhibited different TADF properties depending on the relative positions of their electron donor unit (PhCz) and electron acceptor unit (Trz), show opposite behaviors. These materials are used as sensitizer in phosphorescent solution‐processed organic light emitting diodes (s‐OLEDs) showing moderately high current efficiencies of 19.3 and 20 cd/A, respectively. SiTrzPhCz exhibits stronger TADF properties compared to SiPhCzTrz; however, these stronger TADF characteristics lead to a more pronounced efficiency roll‐off, mainly due to the longer residence time of excitons in SiTrzPhCz, leading to exciton quenching. In contrast, due to their twisted structures, the efficiency roll‐off is efficiently suppressed, particularly for SiTrzPhCz, when both materials are used as hosts. Their twisted structures promote aggregate‐induced emission and prevent aggregation‐caused quenching. Further analysis of exciton dynamics reveals faster decay rate for both singlet and triplet densities in SiPhCzTrz compared to SiTrzPhCz, indicated by its higher fast prompt emission, kFRET and knrT.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"37 1","pages":""},"PeriodicalIF":9.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142251141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temperature-Dependent Recombination Dynamics of Photocarriers in CsPbBr3 Microcrystals Revealed by Ultrafast Terahertz Spectroscopy 超快太赫兹光谱揭示 CsPbBr3 微晶中光电载流子的温度依赖性重组动力学

IF 8 2区材料科学

Advanced Optical Materials Pub Date : 2024-09-17 DOI: 10.1002/adom.202401162

Sheng H. Lee, Kyeongdeuk Moon, Muhammad Shoaib, Charles N. B. Pedorella, Kellen O'Brien, Meng-Ju Sher, Seokhyoung Kim, Tyler L. Cocker

{"title":"Temperature-Dependent Recombination Dynamics of Photocarriers in CsPbBr3 Microcrystals Revealed by Ultrafast Terahertz Spectroscopy","authors":"Sheng H. Lee, Kyeongdeuk Moon, Muhammad Shoaib, Charles N. B. Pedorella, Kellen O'Brien, Meng-Ju Sher, Seokhyoung Kim, Tyler L. Cocker","doi":"10.1002/adom.202401162","DOIUrl":"10.1002/adom.202401162","url":null,"abstract":"The ultrafast dynamics of photoexcited charge carriers are studied in micron-scale crystals composed of the inorganic perovskite CsPbBr3 with time-resolved terahertz spectroscopy. Exciting with photon energy close to the band edge, it is found that a fast (<10 ps) decay emerges in the terahertz photoconductivity with increasing pump fluence and decreasing temperature, dominating the dynamics at 4 K. The fluence-dependent dynamics can be globally fit by a nonlinear recombination model, which reveals that the influence of different nonlinear recombination mechanisms in the studied pump fluence range depends on temperature. Whereas the Auger scattering rate decreases with decreasing temperature from 77 to 4 K, the radiative recombination rate increases by three orders of magnitude. Spectroscopically, the terahertz photoconductivity resembles a Drude response at all delays, yet an additional Lorentz component due to an above-bandwidth resonance is needed to fully reproduce the data.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"12 30","pages":""},"PeriodicalIF":8.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/adom.202401162","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Intramolecular Through‐Space Charge‐Transfer Effect for Achieving Room‐Temperature Phosphorescence in Amorphous Film 实现非晶薄膜室温磷光的分子内穿透空间电荷转移效应

IF 9 2区材料科学

Advanced Optical Materials Pub Date : 2024-09-17 DOI: 10.1002/adom.202400976

Dehai Dou, Xin Zhou, Tian Wang, Qiqi Yang, Xiao Tan, Zhitian Ling, Marvin Manz, Xiaomin Liu, Gert‐Jan A. H. Wetzelaer, Xiaosong Li, Martin Baumgarten, Paul W. M. Blom, Yungui Li

{"title":"Intramolecular Through‐Space Charge‐Transfer Effect for Achieving Room‐Temperature Phosphorescence in Amorphous Film","authors":"Dehai Dou, Xin Zhou, Tian Wang, Qiqi Yang, Xiao Tan, Zhitian Ling, Marvin Manz, Xiaomin Liu, Gert‐Jan A. H. Wetzelaer, Xiaosong Li, Martin Baumgarten, Paul W. M. Blom, Yungui Li","doi":"10.1002/adom.202400976","DOIUrl":"https://doi.org/10.1002/adom.202400976","url":null,"abstract":"Organic emitters that exhibit room‐temperature phosphorescence (RTP) in neat films have application potential for optoelectronic devices, bio‐imaging, and sensing. Due to molecular vibrations or rotations, the majority of triplet excitons recombine rapidly via non‐radiative processes in purely organic emitters, making it challenging to observe RTP in amorphous films. Here, a chemical strategy to enhance RTP in amorphous neat films is reported, by utilizing through‐space charge‐transfer (TSCT) effect induced by intramolecular steric hindrance. The donor and acceptor groups interact via spatial orbital overlaps, while molecular motions are suppressed simultaneously. As a result, triplets generated under photo‐excitation are stabilized in amorphous films, contributing to phosphorescence even at room temperature. The solvatochromic effect on the steady‐state and transient photoluminescence reveals the charge‐transfer feature of involved excited states, while the TSCT effect is further experimentally resolved by femtosecond transient absorption spectroscopy. The designed luminescent materials with pronounced TSCT effect show RTP in amorphous films, with lifetimes up to ≈40 ms, comparable to that in a rigid polymer host. Photoluminescence afterglow longer than 3 s is observed in neat films at room temperature. Therefore, it is demonstrated that utilizing intramolecular steric hindrance to stabilize long‐lived triplets leads to phosphorescence in amorphous films at room temperature.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"3 1","pages":""},"PeriodicalIF":9.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142251149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Skyrmion Quasi‐Bound States in the Continuum for 3D Light Trapping in Arbitrarily Large Volumes 用于在任意大体积中进行三维光捕获的连续真空中的天融准界态

IF 9 2区材料科学

Advanced Optical Materials Pub Date : 2024-09-17 DOI: 10.1002/adom.202401643

Haoye Qin, Zhe Zhang, Qiaolu Chen, Zhechen Zhang, Romain Fleury

{"title":"Skyrmion Quasi‐Bound States in the Continuum for 3D Light Trapping in Arbitrarily Large Volumes","authors":"Haoye Qin, Zhe Zhang, Qiaolu Chen, Zhechen Zhang, Romain Fleury","doi":"10.1002/adom.202401643","DOIUrl":"https://doi.org/10.1002/adom.202401643","url":null,"abstract":"Real‐world resonances face surface‐scaling radiation leakage, hindering light confinement in optically large systems. Conventional bound states in continuum (BICs) challenge this by enabling states with theoretically infinite lifetimes in 2D periodic structures. However, when fabricated, the truncation of these systems to finite sizes inevitably re‐introduces leakage, uncontrollably downgrading their quality factors. Here, a novel form of finite‐size 3D quasi‐BICs (QBICs) is demonstrated that leverage a skyrmion field topology of Bloch modes in 3D cubic photonic crystals. The associated finite systems exhibit highly suppressed radiation in all three spatial directions, with a remarkable exponential volume‐scaling of quality factors. With an unprecedentedly large 3D prototype of 24 cm3 and great scalability, the existence of skyrmion QBICs is experimentally proven through unique far‐field polarization wrapping and spectral singularity. These demonstrations enable to have omnidirectional topological radiation suppression, 3D vortex generation, and access to arbitrarily large volume and volumetric interfaces. 3D QBIC may empower extreme 3D light‐trapping, enhanced volumetric sensing, and topological skyrmion emitters.","PeriodicalId":116,"journal":{"name":"Advanced Optical Materials","volume":"17 1","pages":""},"PeriodicalIF":9.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0