The performance of a perovskite light‐emitting diode (PeLED) is strongly dependent on the perovskite film quality. Among them, the buried interface plays a critical role in the crystallization dynamics of perovskite, directly determining the film morphology and optical properties. Herein, we demonstrate the buried interface engineering to regulate the crystallization kinetics of quasi‐2D perovskite film by inserting a poly(vinyl pyrrolidone) (PVP) modification layer between the hole transport layer and perovskite film. The strategy enhances the surface wettability of the hole transport layer, facilitating the uniform coverage of perovskite. Meanwhile, the carboxyl groups in PVP can interact with undercoordinated Pb ions in perovskite to increase the crystallization sites, thereby effectively passivating defects, regulating phase distribution, and suppressing the formation of low‐dimensional phases. Ultimately, a green PeLED treated with PVP modification layer has achieved a high external quantum efficiency of 24.2%, representing an 87% enhancement. Our results highlight the potential of interface engineering based on functional group interactions as an innovation strategy, enabling significant advances in PeLED efficiency.
{"title":"Interface Engineering for High‐Efficiency Perovskite Light‐Emitting Diode Through Poly(Vinyl Pyrrolidone) (PVP) Modification","authors":"Xulan Xue, Chenhui Zhang, Huidan Zhang, Xingchen Lin, Yongqiang Ning, Lijun Wang, Wenyu Ji, Hongbo Zhu","doi":"10.1002/lpor.202502359","DOIUrl":"https://doi.org/10.1002/lpor.202502359","url":null,"abstract":"The performance of a perovskite light‐emitting diode (PeLED) is strongly dependent on the perovskite film quality. Among them, the buried interface plays a critical role in the crystallization dynamics of perovskite, directly determining the film morphology and optical properties. Herein, we demonstrate the buried interface engineering to regulate the crystallization kinetics of quasi‐2D perovskite film by inserting a poly(vinyl pyrrolidone) (PVP) modification layer between the hole transport layer and perovskite film. The strategy enhances the surface wettability of the hole transport layer, facilitating the uniform coverage of perovskite. Meanwhile, the carboxyl groups in PVP can interact with undercoordinated Pb ions in perovskite to increase the crystallization sites, thereby effectively passivating defects, regulating phase distribution, and suppressing the formation of low‐dimensional phases. Ultimately, a green PeLED treated with PVP modification layer has achieved a high external quantum efficiency of 24.2%, representing an 87% enhancement. Our results highlight the potential of interface engineering based on functional group interactions as an innovation strategy, enabling significant advances in PeLED efficiency.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"55 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145704242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, we developed and optimized a dual‐layer 2D pupil expansion full‐color volume holographic waveguide (2D‐FVHW) for use in an augmented reality (AR) near‐eye display (NED) system. We designed a dual‐layer structure: one layer features a mixed red‐green grating for the 639 and 532 nm channels, while the other layer is dedicated to the 457 nm blue channel. A novel exposure method utilizing monotonic progressive diffractive efficiency is proposed to address issues related to brightness uniformity and color uniformity. This approach not only enhances brightness and color uniformity but also significantly reduces both preparation time and costs. The fabricated 2D‐FVHW exhibits a horizontal field of view of (FOV) 19, a vertical FOV of 21, and a diagonal FOV of 28, with an eyebox size of 14 16 mm and an eye relief of 15 mm. The system demonstrates excellent performance in terms of brightness and color uniformity, achieving a full FOV white light brightness uniformity of 53.9%. Additionally, its color gamut encompasses nearly 100% of the sRGB color gamut, making it a promising solution for high‐performance AR displays. Meanwhile, we provides a detailed analysis of the stray light phenomenon in the 2D‐FVHW, with experimental results showing strong alignment with simulations.
{"title":"2D Pupil Expansion Full‐Color Volume Holographic Waveguide AR Display","authors":"Xin Lyu, Tong Yang, Yongdong Wang, Xiaolan Liu, Yongtian Wang, Dewen Cheng","doi":"10.1002/lpor.202502085","DOIUrl":"https://doi.org/10.1002/lpor.202502085","url":null,"abstract":"In this study, we developed and optimized a dual‐layer 2D pupil expansion full‐color volume holographic waveguide (2D‐FVHW) for use in an augmented reality (AR) near‐eye display (NED) system. We designed a dual‐layer structure: one layer features a mixed red‐green grating for the 639 and 532 nm channels, while the other layer is dedicated to the 457 nm blue channel. A novel exposure method utilizing monotonic progressive diffractive efficiency is proposed to address issues related to brightness uniformity and color uniformity. This approach not only enhances brightness and color uniformity but also significantly reduces both preparation time and costs. The fabricated 2D‐FVHW exhibits a horizontal field of view of (FOV) 19, a vertical FOV of 21, and a diagonal FOV of 28, with an eyebox size of 14 16 mm and an eye relief of 15 mm. The system demonstrates excellent performance in terms of brightness and color uniformity, achieving a full FOV white light brightness uniformity of 53.9%. Additionally, its color gamut encompasses nearly 100% of the sRGB color gamut, making it a promising solution for high‐performance AR displays. Meanwhile, we provides a detailed analysis of the stray light phenomenon in the 2D‐FVHW, with experimental results showing strong alignment with simulations.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"132 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145680241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
High‐order edge‐enhanced imaging enables precise feature localization and effective background suppression, offering a powerful tool for real‐time recognition and high‐contrast visualization. Extending this capability to the mid‐infrared (MIR) regime is particularly valuable for applications such as biomedical diagnostics, material inspection, and remote sensing, yet remains limited by inadequate spatial‐frequency modulation fidelity and low detection sensitivity. Here, we demonstrate a high‐sensitivity MIR upconversion differentiator operating at 3 , which achieves isotropic high‐order edge enhancement by optically imprinting topological complex‐amplitude patterns onto MIR Fourier components via nonlinear parametric interaction. Vortex transfer functions are precisely encoded on a phase‐only spatial light modulator to enable tunable MIR differentiation from first‐ to fourth‐ order, with real‐time switching at up to 60 Hz. Benefiting from a low‐noise upconversion process and a single‐photon‐sensitive silicon camera, the system achieves high‐contrast edge imaging under low‐light conditions. Experimental results confirm accurate edge extraction and background suppression for both amplitude and phase objects, hence underscoring its potential for noninvasive diagnostics and label‐free material analysis.
{"title":"High‐Order Mid‐Infrared Nonlinear Topological Differentiator","authors":"Jixi Zhang, Kun Huang, Shina Liao, Zhuohang Wei, Jianan Fang, Heping Zeng","doi":"10.1002/lpor.202502431","DOIUrl":"https://doi.org/10.1002/lpor.202502431","url":null,"abstract":"High‐order edge‐enhanced imaging enables precise feature localization and effective background suppression, offering a powerful tool for real‐time recognition and high‐contrast visualization. Extending this capability to the mid‐infrared (MIR) regime is particularly valuable for applications such as biomedical diagnostics, material inspection, and remote sensing, yet remains limited by inadequate spatial‐frequency modulation fidelity and low detection sensitivity. Here, we demonstrate a high‐sensitivity MIR upconversion differentiator operating at 3 , which achieves isotropic high‐order edge enhancement by optically imprinting topological complex‐amplitude patterns onto MIR Fourier components via nonlinear parametric interaction. Vortex transfer functions are precisely encoded on a phase‐only spatial light modulator to enable tunable MIR differentiation from first‐ to fourth‐ order, with real‐time switching at up to 60 Hz. Benefiting from a low‐noise upconversion process and a single‐photon‐sensitive silicon camera, the system achieves high‐contrast edge imaging under low‐light conditions. Experimental results confirm accurate edge extraction and background suppression for both amplitude and phase objects, hence underscoring its potential for noninvasive diagnostics and label‐free material analysis.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"35 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145680205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Paul H. Bittorf, Maximilian Black, Hebrew Crispin, Prabhdeep Singh, Parsa Darman, Sara Darbari, Fatemeh Chahshouri, Masoud Taleb, Nahid Talebi
Excitons – bound electron–hole pairs – are central to the optical properties of semiconducting van der Waals materials, offering a platform for exploring strong light‐matter interactions, Bose‐Einstein condensation, superradiance, nanolasing, and energy harvesting applications. While strong exciton–photon coupling is typically realized using high‐quality optical cavities, such architectures often limit scalability and integration with van der Waals heterostructures and photonic circuitry. In this review, we focus on emerging pathways for coherent exciton energy transfer that circumvent these limitations. Specifically, we examine two classes of self‐sustained hybrid light‐matter states: self‐hybridized exciton–polaritons, which arise from intrinsic excitonic interactions with photons in layered materials, and plasmon‐enhanced exciton–polaritons (or plexcitons), enabled by strong coupling between excitons and plasmon polaritons or Bloch plasmon waves. We discuss key experimental approaches, including electron beam excitation, far‐field optical spectroscopy, and scanning‐probe techniques, that allow the direct observation of Fabry‐Pérot resonances, guided polariton modes, and their propagation and dephasing dynamics. Furthermore, we provide a broader overview on exciton energy transfer, contrasting incoherent diffusion with coherent, delocalized transfer mechanisms. Finally, we highlight design strategies and material platforms that are paving the way toward long‐range, room‐temperature coherent exciton transport in van der Waals systems, with implications for quantum optics, integrated photonics, and excitonic circuitry.
{"title":"Long‐Range Exciton Energy Transfer in Two‐Dimensional Materials","authors":"Paul H. Bittorf, Maximilian Black, Hebrew Crispin, Prabhdeep Singh, Parsa Darman, Sara Darbari, Fatemeh Chahshouri, Masoud Taleb, Nahid Talebi","doi":"10.1002/lpor.202501604","DOIUrl":"https://doi.org/10.1002/lpor.202501604","url":null,"abstract":"Excitons – bound electron–hole pairs – are central to the optical properties of semiconducting van der Waals materials, offering a platform for exploring strong light‐matter interactions, Bose‐Einstein condensation, superradiance, nanolasing, and energy harvesting applications. While strong exciton–photon coupling is typically realized using high‐quality optical cavities, such architectures often limit scalability and integration with van der Waals heterostructures and photonic circuitry. In this review, we focus on emerging pathways for coherent exciton energy transfer that circumvent these limitations. Specifically, we examine two classes of self‐sustained hybrid light‐matter states: self‐hybridized exciton–polaritons, which arise from intrinsic excitonic interactions with photons in layered materials, and plasmon‐enhanced exciton–polaritons (or plexcitons), enabled by strong coupling between excitons and plasmon polaritons or Bloch plasmon waves. We discuss key experimental approaches, including electron beam excitation, far‐field optical spectroscopy, and scanning‐probe techniques, that allow the direct observation of Fabry‐Pérot resonances, guided polariton modes, and their propagation and dephasing dynamics. Furthermore, we provide a broader overview on exciton energy transfer, contrasting incoherent diffusion with coherent, delocalized transfer mechanisms. Finally, we highlight design strategies and material platforms that are paving the way toward long‐range, room‐temperature coherent exciton transport in van der Waals systems, with implications for quantum optics, integrated photonics, and excitonic circuitry.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"4 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145673661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhaoyi Wang, Sai Xu, Yuye Gu, You Li, Yuefeng Gao, Ge Zhu, Yichao Wang, Hongquan Yu, Baojiu Chen
Phosphors with efficient blue‐light absorption and near‐infrared (NIR) emission conversion capabilities are essential for high‐performance phosphor‐converted NIR LEDs. Herein, a novel strategy for enhancing blue‐light absorption and Er 3+ NIR‐II emission in double perovskites via Mo 4+ sensitization is developed. Density functional theory calculations reveal that the introduction of Mo 4+ contributes Mo 4d orbitals to the conduction band minimum (CBM), narrowing the bandgap and enabling strong blue‐light absorption. The large absorption cross‐section of Mo 4+ effectively overcomes the limitation of narrow 4f‐4f absorption transitions in Er 3+ . Under blue light excitation, Mo 4+ /Er 3+ co‐doped Cs 2 NaBiCl 6 double perovskite phosphors exhibit broadband emission from Mo 4+ at ∼900 nm along with intrinsic emissions from Er 3+ at ∼1000 nm and ∼1540 nm. Efficient energy transfer from Mo 4+ to Er 3+ boosts the NIR emission at ∼1540 nm by 36.09 times compared to Er 3+ single‐doped sample. The optimized phosphor (Cs 2 NaBiCl 6 :20%Mo 4+ /30%Er 3+ ) achieves a total NIR‐II PLQY of 68.7%, with 34.8% at ∼1540 nm. Integrated with a commercial blue LED chip, an efficient NIR‐II LED achieving a maximum photoelectric conversion efficiency of 13.26% is demonstrated, highlighting potential in anti‐counterfeiting, non‐destructive inspection, and night vision. These results open a novel pathway for efficient sensitization in blue‐light‐excitable NIR phosphors.
{"title":"Enhancement of Blue‐Light‐Excited NIR‐II Emission of Er 3+ in Double Perovskites via Mo 4+ Sensitization","authors":"Zhaoyi Wang, Sai Xu, Yuye Gu, You Li, Yuefeng Gao, Ge Zhu, Yichao Wang, Hongquan Yu, Baojiu Chen","doi":"10.1002/lpor.202502353","DOIUrl":"https://doi.org/10.1002/lpor.202502353","url":null,"abstract":"Phosphors with efficient blue‐light absorption and near‐infrared (NIR) emission conversion capabilities are essential for high‐performance phosphor‐converted NIR LEDs. Herein, a novel strategy for enhancing blue‐light absorption and Er <jats:sup>3+</jats:sup> NIR‐II emission in double perovskites via Mo <jats:sup>4+</jats:sup> sensitization is developed. Density functional theory calculations reveal that the introduction of Mo <jats:sup>4+</jats:sup> contributes Mo 4d orbitals to the conduction band minimum (CBM), narrowing the bandgap and enabling strong blue‐light absorption. The large absorption cross‐section of Mo <jats:sup>4+</jats:sup> effectively overcomes the limitation of narrow <jats:italic>4f‐4f</jats:italic> absorption transitions in Er <jats:sup>3+</jats:sup> . Under blue light excitation, Mo <jats:sup>4+</jats:sup> /Er <jats:sup>3+</jats:sup> co‐doped Cs <jats:sub>2</jats:sub> NaBiCl <jats:sub>6</jats:sub> double perovskite phosphors exhibit broadband emission from Mo <jats:sup>4+</jats:sup> at ∼900 nm along with intrinsic emissions from Er <jats:sup>3+</jats:sup> at ∼1000 nm and ∼1540 nm. Efficient energy transfer from Mo <jats:sup>4+</jats:sup> to Er <jats:sup>3+</jats:sup> boosts the NIR emission at ∼1540 nm by 36.09 times compared to Er <jats:sup>3+</jats:sup> single‐doped sample. The optimized phosphor (Cs <jats:sub>2</jats:sub> NaBiCl <jats:sub>6</jats:sub> :20%Mo <jats:sup>4+</jats:sup> /30%Er <jats:sup>3+</jats:sup> ) achieves a total NIR‐II PLQY of 68.7%, with 34.8% at ∼1540 nm. Integrated with a commercial blue LED chip, an efficient NIR‐II LED achieving a maximum photoelectric conversion efficiency of 13.26% is demonstrated, highlighting potential in anti‐counterfeiting, non‐destructive inspection, and night vision. These results open a novel pathway for efficient sensitization in blue‐light‐excitable NIR phosphors.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"1 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145673619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hengli Zhu, Jiaren Du, Jiaping Zhang, Hengwei Lin, Dirk Poelman
The utilization of X‐ray technology has fundamentally revolutionized the field of medical imaging, radiation therapy, and industrial nondestructive testing. However, ionizing radiation poses significant health risks upon overdose exposure, which necessitates advancement of robust, accurate, and user‐friendly radiation dose assessment systems as a critical safeguard. In this study, Sm 3 ⁺‐doped SrB 4 O 7 photochromic glasses are prepared via a facile microwave‐assisted solid‐state (MASS) method (within 10 min), which exhibit a distinctive X‐ray‐induced chromatic transition from transparency to pronounced darkening, demonstrating high‐contrast photochromic response ( ΔR c = 45.7%) and high sensitivity (1.53 mGy). Significantly, the photochromic response is exclusively induced by X‐ray exposure, rather than by ultraviolet radiation or visible light. This specificity affords a high precision in radiation dosimetry. Furthermore, it exhibits robust photochromic thermal stability (up to 200°C) and exceptional reversible cyclability (bleaching efficiency of 99%) for time‐extended X‐ray detection, attributed to the broad distribution of deep traps (0.97–1.62 eV). This study not only develops a rare‐earth‐doped glass system for a distinctive precision in radiation dosimetry, but also elucidates the mechanistic principles underlying X‐ray‐activated photochromism, paving the way for advanced applications in both real‐time and time‐extended radiometric monitoring and environmental protection technologies.
X射线技术的应用已经从根本上改变了医学成像、放射治疗和工业无损检测领域。然而，电离辐射在过量暴露时会造成重大的健康风险，这就需要发展强大、准确和用户友好的辐射剂量评估系统作为关键保障。在这项研究中，通过简单的微波辅助固态（MASS）方法（在10分钟内）制备了sm3 +掺杂srb407光致变色玻璃，该玻璃表现出独特的X射线诱导的从透明到明显变暗的颜色转变，表现出高对比度的光致变色响应（ΔR c = 45.7%）和高灵敏度（1.53 mGy）。值得注意的是，光致变色反应完全是由X射线照射引起的，而不是由紫外线辐射或可见光引起的。这种特异性提供了辐射剂量测定的高精度。此外，由于深阱分布广泛（0.97-1.62 eV），它具有强大的光致变色热稳定性（高达200°C）和特殊的可逆循环性（漂白效率99%），可用于延长时间的X射线探测。这项研究不仅开发了一种具有独特精度的稀土掺杂玻璃辐射剂量测定系统，而且还阐明了X射线激活光致变色的机制原理，为实时和延时辐射监测和环境保护技术的先进应用铺平了道路。
{"title":"Unlocking Time‐Extended Radiation Dosimetry via Construction of Thermally Stable SrB 4 O 7 :Sm 3+ Photochromic Glass","authors":"Hengli Zhu, Jiaren Du, Jiaping Zhang, Hengwei Lin, Dirk Poelman","doi":"10.1002/lpor.202502429","DOIUrl":"https://doi.org/10.1002/lpor.202502429","url":null,"abstract":"The utilization of X‐ray technology has fundamentally revolutionized the field of medical imaging, radiation therapy, and industrial nondestructive testing. However, ionizing radiation poses significant health risks upon overdose exposure, which necessitates advancement of robust, accurate, and user‐friendly radiation dose assessment systems as a critical safeguard. In this study, Sm <jats:sup>3</jats:sup> ⁺‐doped SrB <jats:sub>4</jats:sub> O <jats:sub>7</jats:sub> photochromic glasses are prepared via a facile microwave‐assisted solid‐state (MASS) method (within 10 min), which exhibit a distinctive X‐ray‐induced chromatic transition from transparency to pronounced darkening, demonstrating high‐contrast photochromic response ( <jats:italic> ΔR <jats:sub>c</jats:sub> </jats:italic> = 45.7%) and high sensitivity (1.53 mGy). Significantly, the photochromic response is exclusively induced by X‐ray exposure, rather than by ultraviolet radiation or visible light. This specificity affords a high precision in radiation dosimetry. Furthermore, it exhibits robust photochromic thermal stability (up to 200°C) and exceptional reversible cyclability (bleaching efficiency of 99%) for time‐extended X‐ray detection, attributed to the broad distribution of deep traps (0.97–1.62 eV). This study not only develops a rare‐earth‐doped glass system for a distinctive precision in radiation dosimetry, but also elucidates the mechanistic principles underlying X‐ray‐activated photochromism, paving the way for advanced applications in both real‐time and time‐extended radiometric monitoring and environmental protection technologies.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"21 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145664775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hao Liu, Nana Jia, Xiaoyi Liu, Jianhao Li, Ge Zhu, Chuang Wang
Copper‐based metal halides have attracted increasing attention due to their non‐toxicity, low cost, and high luminescence efficiency. Nonetheless, improving the external quantum efficiency (EQE) of copper‐based metal halides continues to be a major challenge, constraining their broader commercial application. In this study, the local lattice regulation strategy is proposed to significantly enhance the EQE of Cs 3 Cu 2 Cl 5 phosphors. Through Cd 2+ doping, the Cs 3 Cu 2 Cl 5 : Cd phosphor realizes a record EQE of 90.26%, coupled with excellent thermal stability (83%@368K), highlighting its potential for advanced academic research and applications. Through first‐principles calculations and various experimental tests, it is evident that the electronic structure regulation and the structure distortion effectively enhance light absorption and suppress strong exciton‐phonon interactions. Moreover, the film fabricated by Cs 3 Cu 2 Cl 5 : Cd phosphors exhibit favorable X‐ray imaging characteristics (spatial resolution of 5.6 lp/mm, detection limit of 4.48 µGys −1 , light yield of 52870 ph MeV −1 ), and the WLED based on Cs 3 Cu 2 Cl 5 : Cd phosphors exhibit excellent performance (Ra = 94.1, CCT = 5465), meeting the requirements of X‐ray medical diagnostics and full‐spectrum lighting. This work opens up an innovative avenue for exploring local lattice regulation to enhance the EQE of copper(I)‐based halide perovskites in the future.
{"title":"Local Lattice Regulation in Cesium Copper Halide Phosphors with Record‐Breaking External Quantum Efficiency for WLED and X‐Ray Imaging Applications","authors":"Hao Liu, Nana Jia, Xiaoyi Liu, Jianhao Li, Ge Zhu, Chuang Wang","doi":"10.1002/lpor.202502262","DOIUrl":"https://doi.org/10.1002/lpor.202502262","url":null,"abstract":"Copper‐based metal halides have attracted increasing attention due to their non‐toxicity, low cost, and high luminescence efficiency. Nonetheless, improving the external quantum efficiency (EQE) of copper‐based metal halides continues to be a major challenge, constraining their broader commercial application. In this study, the local lattice regulation strategy is proposed to significantly enhance the EQE of Cs <jats:sub>3</jats:sub> Cu <jats:sub>2</jats:sub> Cl <jats:sub>5</jats:sub> phosphors. Through Cd <jats:sup>2+</jats:sup> doping, the Cs <jats:sub>3</jats:sub> Cu <jats:sub>2</jats:sub> Cl <jats:sub>5</jats:sub> : Cd phosphor realizes a record EQE of 90.26%, coupled with excellent thermal stability (83%@368K), highlighting its potential for advanced academic research and applications. Through first‐principles calculations and various experimental tests, it is evident that the electronic structure regulation and the structure distortion effectively enhance light absorption and suppress strong exciton‐phonon interactions. Moreover, the film fabricated by Cs <jats:sub>3</jats:sub> Cu <jats:sub>2</jats:sub> Cl <jats:sub>5</jats:sub> : Cd phosphors exhibit favorable X‐ray imaging characteristics (spatial resolution of 5.6 lp/mm, detection limit of 4.48 µGys <jats:sup>−1</jats:sup> , light yield of 52870 ph MeV <jats:sup>−1</jats:sup> ), and the WLED based on Cs <jats:sub>3</jats:sub> Cu <jats:sub>2</jats:sub> Cl <jats:sub>5</jats:sub> : Cd phosphors exhibit excellent performance (Ra = 94.1, CCT = 5465), meeting the requirements of X‐ray medical diagnostics and full‐spectrum lighting. This work opens up an innovative avenue for exploring local lattice regulation to enhance the EQE of copper(I)‐based halide perovskites in the future.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"30 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145664773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiulan Shui, Shuangqiang Fang, Tianchun Lang, Haoliang Cheng, Jiaqi Ou, Jiali Yu, Jing Ma, Tiancheng Zhang, Le Wang
The development of low‐cost, rare‐earth‐free light conversion materials is critical for sustainable agriculture. Herein, we report a Bi 3+ /Mn 2+ co‐doped lead‐free double perovskite Cs 2 Ag 0.8 Na 0.2 InCl 6 synthesized via an environmentally friendly mechanochemical method. The phosphor exhibits a broad‐spectrum emission (400–800 nm) with a full width at half maximum (FWHM) of 206 nm, attributed to the synergistic effect of Bi 3+ ‐activated self‐trapped excitons (STEs) and Mn 2+ 4 T 1 → 6 A 1 transitions. Bi 3+ doping not only extends the absorption range to the UVA region (350–400 nm) but also enhances the photoluminescence quantum yield (PLQY) to 99.3% through Bi 3+ →STE and Bi 3+ →Mn 2+ energy transfer. A sunlight conversion film fabricated by incorporating the phosphor into Ecoflex‐0031 silica gel shows excellent mechanical stability (tensile elongation retained over 16 days) and environmental durability. Plant growth experiments with chives and hydrocotyle vulgaris demonstrate significant improvements under the film: chive stem length increased by 136%, hydrocotyle leaf width by 37%, and fresh weight by 17%. This work highlights the potential of Bi 3+ /Mn 2+ co‐doped perovskites as efficient, low‐cost light conversion agents for energy‐saving agricultural cultivation film.
{"title":"Dual‐Channel Sensibilization of Bi 3+ Boosts Near‐Unity Photoluminescence Quantum Yield Rare‐Earth‐Free Halide Perovskite for Energy‐Saving Agricultural Cultivation Film","authors":"Xiulan Shui, Shuangqiang Fang, Tianchun Lang, Haoliang Cheng, Jiaqi Ou, Jiali Yu, Jing Ma, Tiancheng Zhang, Le Wang","doi":"10.1002/lpor.202502708","DOIUrl":"https://doi.org/10.1002/lpor.202502708","url":null,"abstract":"The development of low‐cost, rare‐earth‐free light conversion materials is critical for sustainable agriculture. Herein, we report a Bi <jats:sup>3+</jats:sup> /Mn <jats:sup>2+</jats:sup> co‐doped lead‐free double perovskite Cs <jats:sub>2</jats:sub> Ag <jats:sub>0.8</jats:sub> Na <jats:sub>0.2</jats:sub> InCl <jats:sub>6</jats:sub> synthesized via an environmentally friendly mechanochemical method. The phosphor exhibits a broad‐spectrum emission (400–800 nm) with a full width at half maximum (FWHM) of 206 nm, attributed to the synergistic effect of Bi <jats:sup>3+</jats:sup> ‐activated self‐trapped excitons (STEs) and Mn <jats:sup>2+ 4</jats:sup> T <jats:sub>1</jats:sub> → <jats:sup>6</jats:sup> A <jats:sub>1</jats:sub> transitions. Bi <jats:sup>3+</jats:sup> doping not only extends the absorption range to the UVA region (350–400 nm) but also enhances the photoluminescence quantum yield (PLQY) to 99.3% through Bi <jats:sup>3+</jats:sup> →STE and Bi <jats:sup>3+</jats:sup> →Mn <jats:sup>2+</jats:sup> energy transfer. A sunlight conversion film fabricated by incorporating the phosphor into Ecoflex‐0031 silica gel shows excellent mechanical stability (tensile elongation retained over 16 days) and environmental durability. Plant growth experiments with chives and hydrocotyle vulgaris demonstrate significant improvements under the film: chive stem length increased by 136%, hydrocotyle leaf width by 37%, and fresh weight by 17%. This work highlights the potential of Bi <jats:sup>3+</jats:sup> /Mn <jats:sup>2+</jats:sup> co‐doped perovskites as efficient, low‐cost light conversion agents for energy‐saving agricultural cultivation film.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"115 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145664774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dynamic beam steering is a key functionality in advanced optical systems such as LiDAR, free‐space communication, and machine vision. However, achieving compact, highly efficient, and high‐resolution beam steering in a compact transmissive platform remains challenging. Here, we present a transmissive metasurface engineered with spatially continuous and independently tunable in‐plane momentum gradients that enable continuous and asymmetric 2D beam steering. By laterally shifting the incident beam across the metasurface, continuous modulation of the output angle is realized, with experimentally measured steering ranges reaching 100° horizontally and 70° vertically. The metasurface design avoids reliance on high‐order diffraction, maintaining high theoretical efficiency exceeding 96% across the entire field of illumination. Experimental results confirm smooth angular progression with an average angular resolution of ∼0.4° and an averaged deflection efficiency of 58.1%. Furthermore, we demonstrate that the angular resolution and beam trajectory can be flexibly engineered by modifying the spatial gradient profile, allowing trade‐offs between resolution and coverage. The proposed meta‐optics platform offers a scalable and integration‐friendly solution for next‐generation nanophotonic beam steering, with significant potential for compact LiDAR, chip‐scale optical communication, and 3D sensing applications.
{"title":"Gradient‐Momentum Engineering in Metasurface for Continuous and Asymmetric Beam Steering","authors":"Hsiu‐Ping Su, Po‐Sheng Huang, Pin Chieh Wu","doi":"10.1002/lpor.202502066","DOIUrl":"https://doi.org/10.1002/lpor.202502066","url":null,"abstract":"Dynamic beam steering is a key functionality in advanced optical systems such as LiDAR, free‐space communication, and machine vision. However, achieving compact, highly efficient, and high‐resolution beam steering in a compact transmissive platform remains challenging. Here, we present a transmissive metasurface engineered with spatially continuous and independently tunable in‐plane momentum gradients that enable continuous and asymmetric 2D beam steering. By laterally shifting the incident beam across the metasurface, continuous modulation of the output angle is realized, with experimentally measured steering ranges reaching 100° horizontally and 70° vertically. The metasurface design avoids reliance on high‐order diffraction, maintaining high theoretical efficiency exceeding 96% across the entire field of illumination. Experimental results confirm smooth angular progression with an average angular resolution of ∼0.4° and an averaged deflection efficiency of 58.1%. Furthermore, we demonstrate that the angular resolution and beam trajectory can be flexibly engineered by modifying the spatial gradient profile, allowing trade‐offs between resolution and coverage. The proposed meta‐optics platform offers a scalable and integration‐friendly solution for next‐generation nanophotonic beam steering, with significant potential for compact LiDAR, chip‐scale optical communication, and 3D sensing applications.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"33 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145664776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yang Zhang, Jiangming Xu, Jun Ye, Xiaoya Ma, Junrui Liang, Yidong Guo, Pu Zhou
Chaos‐based encryption techniques have been widely employed to secure optical information in both temporal and spatial domains. Yet, chaotic spectral encryption has received limited attention due to the significant challenge in broadband spectral chaos generation. Here, we report broadband spectral chaos generation in a random fiber laser, achieving a record‐high spectral complexity with up to 21 157 spectral spikes spanning 900–1700 nm. Multiple nonlinear processes, including stimulated Brillouin scattering, stimulated Raman scattering, and four‐wave mixing, are activated at an optimized pump power, giving rise to rich and unpredictable spectral dynamics. The randomness of the chaotic spectra is validated through a comprehensive statistical analysis of 1001 recorded spectral realizations. Leveraging the broadband spectral chaos, we realize simultaneous spectral encryption of multi‐bit binary digital signals. This work unveils a new chaotic dimension in laser physics with significant implications for data encryption and high‐entropy random sequence generation. Moreover, its inherent extreme sensitivity to perturbations suggests potential applications in ultra‐precise sensing technologies.
{"title":"Ultra‐Broadband Spectral Chaos in Random Fiber Laser for Optical Encryption","authors":"Yang Zhang, Jiangming Xu, Jun Ye, Xiaoya Ma, Junrui Liang, Yidong Guo, Pu Zhou","doi":"10.1002/lpor.202502519","DOIUrl":"https://doi.org/10.1002/lpor.202502519","url":null,"abstract":"Chaos‐based encryption techniques have been widely employed to secure optical information in both temporal and spatial domains. Yet, chaotic spectral encryption has received limited attention due to the significant challenge in broadband spectral chaos generation. Here, we report broadband spectral chaos generation in a random fiber laser, achieving a record‐high spectral complexity with up to 21 157 spectral spikes spanning 900–1700 nm. Multiple nonlinear processes, including stimulated Brillouin scattering, stimulated Raman scattering, and four‐wave mixing, are activated at an optimized pump power, giving rise to rich and unpredictable spectral dynamics. The randomness of the chaotic spectra is validated through a comprehensive statistical analysis of 1001 recorded spectral realizations. Leveraging the broadband spectral chaos, we realize simultaneous spectral encryption of multi‐bit binary digital signals. This work unveils a new chaotic dimension in laser physics with significant implications for data encryption and high‐entropy random sequence generation. Moreover, its inherent extreme sensitivity to perturbations suggests potential applications in ultra‐precise sensing technologies.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"10 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145664777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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