Zhigang Zang, Dehai Liang, Yingrui Shi, Zhenyu Liu, Ru Li, Saif M. H. Qaid, Wensi Cai
Low‐dimensional hybrid organic‐inorganic metal halides (OIMHs) have attracted considerable attention in anti‐counterfeiting due to their non‐toxicity and high photoluminescence quantum yield (PLQY). However, many reported OIMHs are either not reversible or have a poor PLQY. In this study, two antimony‐based halides, (C21H21P)2SbCl5 and (C22H24P)2SbCl5, are synthesized using different organic cations. Both compounds exhibit bright orange–yellow emissions with a PLQY of 82.6% and 83.5%, respectively. The orange–yellow emission of (C21H21P)2SbCl5 and (C22H24P)2SbCl5 are attributed to the radiative recombination of self‐trapping excitons. While (C21H21P)2SbCl5 maintains stable orange–yellow luminescence when exposed to ethanol, (C22H24P)2SbCl5 undergoes a structural transformation to non‐luminescent (C22H24P)2Sb2Cl8 upon ethanol treatment, which can be reverted to its luminescent state by heating. Even after multiple cycles, the PLQY of (C22H24P)2SbCl5 is still over 80%, demonstrating excellent cycling stability. (C21H21P)2SbCl5 and (C22H24P)2SbCl5 are also explored as fluorescent materials for Morse code anti‐counterfeiting and optical logic gate applications. This work offers a completely new option for fluorescent material used for security information.
{"title":"Ethanol‐Induced Reversible Phase Transition in Antimony Halides for Morse Code Anti‐Counterfeiting and Optical Logic Gates","authors":"Zhigang Zang, Dehai Liang, Yingrui Shi, Zhenyu Liu, Ru Li, Saif M. H. Qaid, Wensi Cai","doi":"10.1002/lpor.202401304","DOIUrl":"https://doi.org/10.1002/lpor.202401304","url":null,"abstract":"Low‐dimensional hybrid organic‐inorganic metal halides (OIMHs) have attracted considerable attention in anti‐counterfeiting due to their non‐toxicity and high photoluminescence quantum yield (PLQY). However, many reported OIMHs are either not reversible or have a poor PLQY. In this study, two antimony‐based halides, (C<jats:sub>21</jats:sub>H<jats:sub>21</jats:sub>P)<jats:sub>2</jats:sub>SbCl<jats:sub>5</jats:sub> and (C<jats:sub>22</jats:sub>H<jats:sub>24</jats:sub>P)<jats:sub>2</jats:sub>SbCl<jats:sub>5</jats:sub>, are synthesized using different organic cations. Both compounds exhibit bright orange–yellow emissions with a PLQY of 82.6% and 83.5%, respectively. The orange–yellow emission of (C<jats:sub>21</jats:sub>H<jats:sub>21</jats:sub>P)<jats:sub>2</jats:sub>SbCl<jats:sub>5</jats:sub> and (C<jats:sub>22</jats:sub>H<jats:sub>24</jats:sub>P)<jats:sub>2</jats:sub>SbCl<jats:sub>5</jats:sub> are attributed to the radiative recombination of self‐trapping excitons. While (C<jats:sub>21</jats:sub>H<jats:sub>21</jats:sub>P)<jats:sub>2</jats:sub>SbCl<jats:sub>5</jats:sub> maintains stable orange–yellow luminescence when exposed to ethanol, (C<jats:sub>22</jats:sub>H<jats:sub>24</jats:sub>P)<jats:sub>2</jats:sub>SbCl<jats:sub>5</jats:sub> undergoes a structural transformation to non‐luminescent (C<jats:sub>22</jats:sub>H<jats:sub>24</jats:sub>P)<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Cl<jats:sub>8</jats:sub> upon ethanol treatment, which can be reverted to its luminescent state by heating. Even after multiple cycles, the PLQY of (C<jats:sub>22</jats:sub>H<jats:sub>24</jats:sub>P)<jats:sub>2</jats:sub>SbCl<jats:sub>5</jats:sub> is still over 80%, demonstrating excellent cycling stability. (C<jats:sub>21</jats:sub>H<jats:sub>21</jats:sub>P)<jats:sub>2</jats:sub>SbCl<jats:sub>5</jats:sub> and (C<jats:sub>22</jats:sub>H<jats:sub>24</jats:sub>P)<jats:sub>2</jats:sub>SbCl<jats:sub>5</jats:sub> are also explored as fluorescent materials for Morse code anti‐counterfeiting and optical logic gate applications. This work offers a completely new option for fluorescent material used for security information.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"2 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597411","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}
The demand for achromatic ultrathin flat lenses has become increasingly stringent, particularly for high‐performance imaging and display applications. Despite significant progress in achromatic metasurface and diffraction lenses, no single material has yet been capable of constructing ultrathin achromatic flat lenses covering ultrabroad wavebands, including the visible and near‐infrared (NIR), due to the limitations of material bandgaps. This limitation complicates fabrication processes, integration, and miniaturization, often leading to instability. In this paper, making use of the dispersionless nature of graphene, high numerical aperture multi‐wavelength achromatic metalenses (MAGLs) made entirely from graphene is proposed and demonstrated. This approach, based on a partial intensity resonance (PIR) mechanism, requires no iterative algorithms. Two MAGLs for visible and communication bands, respectively, are designed and fabricated. Remarkably, the measured focal lengths only deviate by less than 0.15% from the desired values. The graphene metalens (GML) in the visible produced clear and high‐quality images of microscopic character and Brassica napus cells. The demonstrated MAGLs significantly simplify the fabrication process and enhance integration, miniaturization, and stability. Their unique single‐material design offers tremendous potential to replace conventional refractive lenses in applications such as virtual reality glasses, hyperspectral imaging systems, and fluorescence microscopes.
{"title":"Multi‐Wavelength Achromatic Graphene Metalenses for Visible, NIR, and Beyond","authors":"Guiyuan Cao, Shibiao Wei, Siqi Wang, Xining Xu, Wenbo Liu, Huihui Zhang, Jingheng Liu, Zhenqian Han, Weisong Zhao, Haoyu Li, Han Lin, Xiaocong Yuan, Baohua Jia","doi":"10.1002/lpor.202401542","DOIUrl":"https://doi.org/10.1002/lpor.202401542","url":null,"abstract":"The demand for achromatic ultrathin flat lenses has become increasingly stringent, particularly for high‐performance imaging and display applications. Despite significant progress in achromatic metasurface and diffraction lenses, no single material has yet been capable of constructing ultrathin achromatic flat lenses covering ultrabroad wavebands, including the visible and near‐infrared (NIR), due to the limitations of material bandgaps. This limitation complicates fabrication processes, integration, and miniaturization, often leading to instability. In this paper, making use of the dispersionless nature of graphene, high numerical aperture multi‐wavelength achromatic metalenses (MAGLs) made entirely from graphene is proposed and demonstrated. This approach, based on a partial intensity resonance (PIR) mechanism, requires no iterative algorithms. Two MAGLs for visible and communication bands, respectively, are designed and fabricated. Remarkably, the measured focal lengths only deviate by less than 0.15% from the desired values. The graphene metalens (GML) in the visible produced clear and high‐quality images of microscopic character and Brassica napus cells. The demonstrated MAGLs significantly simplify the fabrication process and enhance integration, miniaturization, and stability. Their unique single‐material design offers tremendous potential to replace conventional refractive lenses in applications such as virtual reality glasses, hyperspectral imaging systems, and fluorescence microscopes.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"70 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597410","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}
Bound states in the continuum represent a captivating and significant phenomenon in the realms of photonics, materials science, and quantum mechanics. These exceptional resonant states have emerged as crucial elements in a diverse array of nanotechnology applications including chiral nanophotonics. Applying bound states in the continuum for chiral applications is a challenging problem and usually requires some additional complicated steps such as multi‐layer lithography, adding superstrate with index matching materials and geometry parameters adjusting. Nevertheless, creating a structure placed in inhomogeneous background that is capable to perfectly convert one circular polarization to the opposite one is still a challenging problem. This work presents chiral metasurface based on bound states in the continuum allowing to achieve perfect unitary circular conversion in an inhomogeneous environment. This approach is based on a coupling of two chiral but not perfect resonances which makes it possible to get one mode with chiral dichroism value of 1. A theoretical model is built, perform numerical calculation and conduct an experimental verification to prove this concept. The presented results could find many applications in sensing, optics, telecommunications, biomedical and chemical analysis.
{"title":"In‐Plane Metasurface Design for Perfect Chiral Dichroism in Inhomogeneous Environment","authors":"Sergei Li, Binze Ma, Qiang Li, Mikhail V. Rybin","doi":"10.1002/lpor.202400212","DOIUrl":"https://doi.org/10.1002/lpor.202400212","url":null,"abstract":"Bound states in the continuum represent a captivating and significant phenomenon in the realms of photonics, materials science, and quantum mechanics. These exceptional resonant states have emerged as crucial elements in a diverse array of nanotechnology applications including chiral nanophotonics. Applying bound states in the continuum for chiral applications is a challenging problem and usually requires some additional complicated steps such as multi‐layer lithography, adding superstrate with index matching materials and geometry parameters adjusting. Nevertheless, creating a structure placed in inhomogeneous background that is capable to perfectly convert one circular polarization to the opposite one is still a challenging problem. This work presents chiral metasurface based on bound states in the continuum allowing to achieve perfect unitary circular conversion in an inhomogeneous environment. This approach is based on a coupling of two chiral but not perfect resonances which makes it possible to get one mode with chiral dichroism value of 1. A theoretical model is built, perform numerical calculation and conduct an experimental verification to prove this concept. The presented results could find many applications in sensing, optics, telecommunications, biomedical and chemical analysis.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"33 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597412","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}
Pengbo Jia, Zhaochen Li, Shiqiang Xia, Domenico Bongiovanni, Liqin Tang, Wenrong Qi, Yingying Zhang, Xingdong Zhao, Keyu Su, Zunlue Zhu, Yi Hu
Although periodic photonic structures, especially associated with nonlinearity, play a prominent role in optics nowadays, effective detection of their nonlinearity still remains a critical challenge. Here, an approach is proposed to detect the nonlinearity of photonic lattices in a direct way. By properly launching structured beams, namely Airy beams, into the lattices, the nonlinear response function of the discrete system can be directly obtained in the nonlinearly-shaped beam profiles. To be specific, a single Airy beam is utilized to map self-defocusing nonlinearity, while self-focusing nonlinearity, which is hard to visualize in the bulk case, is readily discerned by employing double Airy beams in photonic structures. The proposed method is validated numerically and experimentally by detecting different types of nonlinearities of photonic lattices fabricated in a nonlinear crystal. These findings introduce a promising route for characterizing the nonlinear response of optical structures, thereby broadening the scope of nonlinear measurement and is expected to be extended into other periodic photonic structures.
{"title":"Detection of Nonlinearity in Photonic Lattices","authors":"Pengbo Jia, Zhaochen Li, Shiqiang Xia, Domenico Bongiovanni, Liqin Tang, Wenrong Qi, Yingying Zhang, Xingdong Zhao, Keyu Su, Zunlue Zhu, Yi Hu","doi":"10.1002/lpor.202400937","DOIUrl":"https://doi.org/10.1002/lpor.202400937","url":null,"abstract":"Although periodic photonic structures, especially associated with nonlinearity, play a prominent role in optics nowadays, effective detection of their nonlinearity still remains a critical challenge. Here, an approach is proposed to detect the nonlinearity of photonic lattices in a direct way. By properly launching structured beams, namely Airy beams, into the lattices, the nonlinear response function of the discrete system can be directly obtained in the nonlinearly-shaped beam profiles. To be specific, a single Airy beam is utilized to map self-defocusing nonlinearity, while self-focusing nonlinearity, which is hard to visualize in the bulk case, is readily discerned by employing double Airy beams in photonic structures. The proposed method is validated numerically and experimentally by detecting different types of nonlinearities of photonic lattices fabricated in a nonlinear crystal. These findings introduce a promising route for characterizing the nonlinear response of optical structures, thereby broadening the scope of nonlinear measurement and is expected to be extended into other periodic photonic structures.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"13 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142588839","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}
Two-dimensional transition metal dichalcogenides feature a direct tunable bandgap and robust spin-valley coupling, offering an additional valley degree of freedom for information carriers. While optical spin-orbit coupling has traditionally facilitated valley manipulation, on-chip control of nonlinear valley photons remains elusive. Here, the directional coupling of nonlinear chiral valley photons through optical orbit-orbit coupling in monolayer tungsten disulfide at room temperature is demonstrated. The chirality of nonlinear valley photons is governed by the spin angular momentum of the pump light, adhering to nonlinear selection rules. Importantly, the coupling direction is controlled by the orbital angular momentum of the pump light, facilitated by the orbital momentum flux. This approach not only provides a novel method for manipulating the valley degree of freedom but also enhances the flexibility of directing valley photon emission and on-chip routing. These developments hold promising prospects for advanced valley optoelectronic devices.
{"title":"Steering Nonlinear Chiral Valley Photons Through Optical Orbit–Orbit Coupling","authors":"Hai Lin, Guanyu Zhang, Guodong Xue, Weichao Xie, Wenguo Zhu, Kaihui Liu, Zuojian Pan, Qihuang Gong, Guowei Lyu","doi":"10.1002/lpor.202400545","DOIUrl":"https://doi.org/10.1002/lpor.202400545","url":null,"abstract":"Two-dimensional transition metal dichalcogenides feature a direct tunable bandgap and robust spin-valley coupling, offering an additional valley degree of freedom for information carriers. While optical spin-orbit coupling has traditionally facilitated valley manipulation, on-chip control of nonlinear valley photons remains elusive. Here, the directional coupling of nonlinear chiral valley photons through optical orbit-orbit coupling in monolayer tungsten disulfide at room temperature is demonstrated. The chirality of nonlinear valley photons is governed by the spin angular momentum of the pump light, adhering to nonlinear selection rules. Importantly, the coupling direction is controlled by the orbital angular momentum of the pump light, facilitated by the orbital momentum flux. This approach not only provides a novel method for manipulating the valley degree of freedom but also enhances the flexibility of directing valley photon emission and on-chip routing. These developments hold promising prospects for advanced valley optoelectronic devices.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"29 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142588847","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}
Juan Wei, Jingxue Hu, Mingye Zhu, Jilong Wu, Min Xiao, Yulong Wang, Yuxiang Zhou, Shujuan Liu, Yun Ma, Qiang Zhao
Smart persistent organic room-temperature phosphorescence (RTP) materials, capable of responding to microenvironmental changes, are critically important in various optoelectronic applications. However, conventional persistent RTP materials usually have not stretchability and flexibility, limiting some practical applications. This study reports a facile and one-pot photo-initiated copolymerization method to prepare photoactivated persistent RTP polymers with multicolored afterglow, excellent stretchability, self-healable and recyclable properties. Impressively, the polymers can be stretched up to 500% without significant loss in RTP intensity and lifetime, and they possess a self-healing ability with a healing efficiency of 69.6%. Utilizing these photoactivated and stretchable persistent RTP polymers, dual encryption can be achieved under UV irradiation and stretching conditions, thereby enhancing the security levels of the stored confidential information. Overall, this study represents the first example of self-healable and recyclable stimuli-responsive RTP materials, demonstrating their bright future for the flexible and wearable optoelectronics.
{"title":"Photoactivated Multicolor Organic Phosphorescence in Intrinsically Stretchable, Self-Healable and Recyclable Polymers","authors":"Juan Wei, Jingxue Hu, Mingye Zhu, Jilong Wu, Min Xiao, Yulong Wang, Yuxiang Zhou, Shujuan Liu, Yun Ma, Qiang Zhao","doi":"10.1002/lpor.202400971","DOIUrl":"https://doi.org/10.1002/lpor.202400971","url":null,"abstract":"Smart persistent organic room-temperature phosphorescence (RTP) materials, capable of responding to microenvironmental changes, are critically important in various optoelectronic applications. However, conventional persistent RTP materials usually have not stretchability and flexibility, limiting some practical applications. This study reports a facile and one-pot photo-initiated copolymerization method to prepare photoactivated persistent RTP polymers with multicolored afterglow, excellent stretchability, self-healable and recyclable properties. Impressively, the polymers can be stretched up to 500% without significant loss in RTP intensity and lifetime, and they possess a self-healing ability with a healing efficiency of 69.6%. Utilizing these photoactivated and stretchable persistent RTP polymers, dual encryption can be achieved under UV irradiation and stretching conditions, thereby enhancing the security levels of the stored confidential information. Overall, this study represents the first example of self-healable and recyclable stimuli-responsive RTP materials, demonstrating their bright future for the flexible and wearable optoelectronics.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"10 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142588842","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}
Joohoon Kim, Jungkwuen An, Wonjoong Kim, Junhwa Seong, Yujin Park, Eunji Lee, Seokwoo Kim, Seokil Moon, Chang-Kun Lee, Heon Lee, Junsuk Rho
Metasurface-based flat optics has a great potential to replace conventional bulky and heavy optical elements, consistent with the trend of miniaturizing optical elements. One of the trends is to broaden the operating area of the metasurface. The previous approaches are focused on expanding the metasurface area, which has intrinsic manufacturing and optical limitations. Here, this work presents the fabrication of wafer-scale metalens arrays, and demonstrates the Gabor superlens composed of the metalens arrays, which behaves optically like a large lens system. A pair of fabricated 8-inch-sized metalens arrays are used to float the large-area display, producing a real image in the air. This superlens is easily manufactured in a high-throughput and cost-effective manner using an argon fluoride dry scanner and a single reticle. Their capability for diffraction-limited focusing and imaging is demonstrated. Considering the groundbreaking nature of imaging a large-area display through the metalens arrays, this work shows a great potential for scaling up the optical display systems in a simple manner.
{"title":"Large-Area Floating Display with Wafer-Scale Manufactured Metalens Arrays","authors":"Joohoon Kim, Jungkwuen An, Wonjoong Kim, Junhwa Seong, Yujin Park, Eunji Lee, Seokwoo Kim, Seokil Moon, Chang-Kun Lee, Heon Lee, Junsuk Rho","doi":"10.1002/lpor.202401425","DOIUrl":"https://doi.org/10.1002/lpor.202401425","url":null,"abstract":"Metasurface-based flat optics has a great potential to replace conventional bulky and heavy optical elements, consistent with the trend of miniaturizing optical elements. One of the trends is to broaden the operating area of the metasurface. The previous approaches are focused on expanding the metasurface area, which has intrinsic manufacturing and optical limitations. Here, this work presents the fabrication of wafer-scale metalens arrays, and demonstrates the Gabor superlens composed of the metalens arrays, which behaves optically like a large lens system. A pair of fabricated 8-inch-sized metalens arrays are used to float the large-area display, producing a real image in the air. This superlens is easily manufactured in a high-throughput and cost-effective manner using an argon fluoride dry scanner and a single reticle. Their capability for diffraction-limited focusing and imaging is demonstrated. Considering the groundbreaking nature of imaging a large-area display through the metalens arrays, this work shows a great potential for scaling up the optical display systems in a simple manner.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"13 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142580651","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}
Quasi-two-dimensional (quasi-2D) perovskites, consisting of multi-quantum wells (MQWs) separated by organic intercalating cations, exhibit high luminescence efficiency while the photophysical processes involved remain partially obscure due to the uncertainty of the MQWs structure. Herein, a synergetic dual-additive strategy is adopted to prepare quasi-2D perovskite films, where 18-crown-6 and tris(4-fluorophenyl)phosphine oxide are utilized to suppress the formation of low-dimensional perovskites, diminish defect density, and enhance photoluminescence quantum yield to 93.7%. Notably, a long-lived delayed component, spanning hundreds of microseconds, is identified for the first time in perovskite emitters, which correlates with exciton dissociation and recombination, and the differences in temperature-dependent radiative lifetime of the delayed components match with the luminescence properties. Finally, benefiting from lower trap density and more efficient energy-funneling, green PeLEDs treated with dual additives have achieved a high external quantum efficiency of 28.9% and a commendable operating half-lifetime of 17.8 h at an initial brightness of 500 cd m−2. The observation of the long-lived delayed components, coupled with insights into exciton dissociation, provides a profound and comprehensive understanding of the fundamental carrier behavior in perovskite emitters and establishes a direct correlation between the properties of perovskite emitters and their photophysical processes.
{"title":"Exciton Dissociation and Long-Lived Delayed Components in High-Efficiency Quasi-Two-Dimensional Green Perovskite Light-Emitting Diodes","authors":"Guanwei Sun, Sheng Liao, Guo-Xi Yang, Chenyang Shen, Ling Hong, Denghui Liu, Junrong Pu, Weidong Qiu, Zijian Chen, Zhihai Yang, Fei Huang, Ming-De Li, Shi-Jian Su","doi":"10.1002/lpor.202400732","DOIUrl":"https://doi.org/10.1002/lpor.202400732","url":null,"abstract":"Quasi-two-dimensional (quasi-2D) perovskites, consisting of multi-quantum wells (MQWs) separated by organic intercalating cations, exhibit high luminescence efficiency while the photophysical processes involved remain partially obscure due to the uncertainty of the MQWs structure. Herein, a synergetic dual-additive strategy is adopted to prepare quasi-2D perovskite films, where 18-crown-6 and tris(4-fluorophenyl)phosphine oxide are utilized to suppress the formation of low-dimensional perovskites, diminish defect density, and enhance photoluminescence quantum yield to 93.7%. Notably, a long-lived delayed component, spanning hundreds of microseconds, is identified for the first time in perovskite emitters, which correlates with exciton dissociation and recombination, and the differences in temperature-dependent radiative lifetime of the delayed components match with the luminescence properties. Finally, benefiting from lower trap density and more efficient energy-funneling, green PeLEDs treated with dual additives have achieved a high external quantum efficiency of 28.9% and a commendable operating half-lifetime of 17.8 h at an initial brightness of 500 cd m<sup>−2</sup>. The observation of the long-lived delayed components, coupled with insights into exciton dissociation, provides a profound and comprehensive understanding of the fundamental carrier behavior in perovskite emitters and establishes a direct correlation between the properties of perovskite emitters and their photophysical processes.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"5 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142588841","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}
Florian Pilat, Andreas Windischhofer, Maximilian Beiser, Vito F. Pecile, Elizaveta Gangrskaia, Audrius Pugžlys, Robert Weih, Johannes Koeth, Andrius Baltuška, Oliver H. Heckl, Benedikt Schwarz
Interband Cascade Lasers (ICL) have matured into a versatile technological platform in the mid-infrared spectral domain. To broaden their applicability even further, ongoing research pursues the emission of ultrashort pulses. The most promising approach is passive mode-locking with a fast saturable absorber. However, despite vast attempts no passive mode-locked ICL has been demonstrated up to date. In this study, pump-probe measurements are conducted on the ICL gain, demonstrating that 60–70% of its dynamic behavior is characterized by a rapid recovery time of 2 ps. The findings explain why passive mode-locking of ICLs has not succeeded so far, shedding a new light on ICL dynamics as strategies are proposed to overcome the current limitations.
{"title":"Fast Gain Dynamics in Interband Cascade Lasers","authors":"Florian Pilat, Andreas Windischhofer, Maximilian Beiser, Vito F. Pecile, Elizaveta Gangrskaia, Audrius Pugžlys, Robert Weih, Johannes Koeth, Andrius Baltuška, Oliver H. Heckl, Benedikt Schwarz","doi":"10.1002/lpor.202400867","DOIUrl":"https://doi.org/10.1002/lpor.202400867","url":null,"abstract":"Interband Cascade Lasers (ICL) have matured into a versatile technological platform in the mid-infrared spectral domain. To broaden their applicability even further, ongoing research pursues the emission of ultrashort pulses. The most promising approach is passive mode-locking with a fast saturable absorber. However, despite vast attempts no passive mode-locked ICL has been demonstrated up to date. In this study, pump-probe measurements are conducted on the ICL gain, demonstrating that <span data-altimg=\"/cms/asset/61fa9d7f-bda7-4222-ae98-e362a4ff64f0/lpor202400867-math-0001.png\"></span><mjx-container ctxtmenu_counter=\"19\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" role=\"application\" sre-explorer- style=\"font-size: 103%; position: relative;\" tabindex=\"0\"><mjx-math aria-hidden=\"true\" location=\"graphic/lpor202400867-math-0001.png\"><mjx-semantics><mjx-mo data-semantic- data-semantic-role=\"equality\" data-semantic-speech=\"almost equals\" data-semantic-type=\"relation\"><mjx-c></mjx-c></mjx-mo></mjx-semantics></mjx-math><mjx-assistive-mml display=\"inline\" unselectable=\"on\"><math altimg=\"urn:x-wiley:18638880:media:lpor202400867:lpor202400867-math-0001\" display=\"inline\" location=\"graphic/lpor202400867-math-0001.png\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><semantics><mo data-semantic-=\"\" data-semantic-role=\"equality\" data-semantic-speech=\"almost equals\" data-semantic-type=\"relation\">≈</mo>$approx$</annotation></semantics></math></mjx-assistive-mml></mjx-container>60–70% of its dynamic behavior is characterized by a rapid recovery time of 2 ps. The findings explain why passive mode-locking of ICLs has not succeeded so far, shedding a new light on ICL dynamics as strategies are proposed to overcome the current limitations.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"142 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142574432","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}
Xin Liu, Guangming Niu, Jutao Jiang, Li Che, Laizhi Sui, Xiaowei Wang, Xiangyu Zeng, Guorong Wu, Kaijun Yuan, Xueming Yang
Lead‐free halide double perovskites (DPs) have attracted much attention due to their potential applications in the field of near‐infrared (NIR) optoelectronics. However, regulating the NIR luminescence properties of such materials remains a challenge. In this study, it is found that Cs2AgInCl6:Cr3+ DPs exhibit a broad NIR emission under ultraviolet excitation, with a peak value of 980 nm. In the range of 9 GPa, the emission intensity increases significantly. As the pressure increases, a transition from broadband NIR emission to narrow‐line emission occurs, accompanied by a decrease in the full width at half maximum (FWHM) from 260 to 40 nm, attributed to increased local structural asymmetry and enhanced crystal field around Cr3+ ions. Ultrafast transient absorption experiments reveal the changes of energy transfer under pressure and the emergence of new radiation channels, demonstrating the dynamic evolution of emission characteristics under high pressure. The research results deepen the understanding of high pressure luminescence in Cr3⁺‐doped halide DPs, providing strategies for designing highly efficient NIR emitters in metal halide DPs.
{"title":"High‐Pressure Modulation of NIR Luminescence in Cr3+‐Doped Cs2AgInCl6 Double Perovskites: The Role of Ultrafast Energy Transfer","authors":"Xin Liu, Guangming Niu, Jutao Jiang, Li Che, Laizhi Sui, Xiaowei Wang, Xiangyu Zeng, Guorong Wu, Kaijun Yuan, Xueming Yang","doi":"10.1002/lpor.202401000","DOIUrl":"https://doi.org/10.1002/lpor.202401000","url":null,"abstract":"Lead‐free halide double perovskites (DPs) have attracted much attention due to their potential applications in the field of near‐infrared (NIR) optoelectronics. However, regulating the NIR luminescence properties of such materials remains a challenge. In this study, it is found that Cs<jats:sub>2</jats:sub>AgInCl<jats:sub>6</jats:sub>:Cr<jats:sup>3+</jats:sup> DPs exhibit a broad NIR emission under ultraviolet excitation, with a peak value of 980 nm. In the range of 9 GPa, the emission intensity increases significantly. As the pressure increases, a transition from broadband NIR emission to narrow‐line emission occurs, accompanied by a decrease in the full width at half maximum (FWHM) from 260 to 40 nm, attributed to increased local structural asymmetry and enhanced crystal field around Cr<jats:sup>3+</jats:sup> ions. Ultrafast transient absorption experiments reveal the changes of energy transfer under pressure and the emergence of new radiation channels, demonstrating the dynamic evolution of emission characteristics under high pressure. The research results deepen the understanding of high pressure luminescence in Cr<jats:sup>3</jats:sup>⁺‐doped halide DPs, providing strategies for designing highly efficient NIR emitters in metal halide DPs.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"17 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142574434","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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