Journal of Materials Chemistry C最新文献

{"title":"Synthesis, electronic properties and on-surface switching behaviour of triazatruxene dimers and tetramers†‡","authors":"Lars Vogelsang, Tobias Birk, Fabian Kostrzewa, Niklas Bauch, Gabriel Maier, Jonas Rendler, Michael Linseis, Mikhail Fonin and Rainer F. Winter","doi":"10.1039/D5TC00567A","DOIUrl":"https://doi.org/10.1039/D5TC00567A","url":null,"abstract":"<p >The realization of single molecule-based electronic switching devices is an intriguing perspective on the path towards ultimate device miniaturization. In particular, the integration of multiple switching centers into a single molecule will open new possibilities for device integration. Here, we report on the synthesis, characterization, and the redox and the on-surface switching properties of the triazatruxene (TAT) dimer <strong>1</strong> and tetramer <strong>2</strong> with covalent butadiynediyl or ethynediyl linkages between the TAT moieties. TAT oxidation gives rise to electronic absorption over the entire range of electromagnetic radiation in the UV/vis/NIR (NIR = near infrared), with TAT → TAT<small>⁺</small> charge transfer absorptions in mixed-valent redox states. For on-surface switching, both compounds were successfully deposited on an Ag(111) substrate using electrospray deposition (ESD). Compound <strong>1</strong> retains the low-bias three-level switching of both constituting TAT units, giving rise to six distinguishable switching states. In tetramer <strong>2</strong>, the larger number of substrate anchoring points restricts on-surface configurations to those with only one or two non-neighbouring low-bias activatable TAT switching units. Our findings demonstrate that it is possible to realize single-molecule multi-state switches with covalently linked TAT units and pinpoint the particular impact of the substrate on their switching dynamics.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 21","pages":" 10834-10847"},"PeriodicalIF":5.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144171143","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}

{"title":"Deciphering a novel mechanism for single-component white light emission: synergistic effects of ESIPT and excimers†","authors":"Siqi Wang, Hongyan Mu, Jialin Liang, Xinlin Yang, Jiaan Gao, Hui Li and Guangyong Jin","doi":"10.1039/D5TC00341E","DOIUrl":"https://doi.org/10.1039/D5TC00341E","url":null,"abstract":"<p >The development of novel single-component white light materials is crucial for advancing the progress of efficient, low-cost, and environmentally friendly optoelectronic devices. However, the complex luminescence mechanisms of full-spectrum emitters pose significant challenges to the development of white light materials. In this study, the luminescence mechanisms of three molecules (<strong>CF<small>₃</small>-HTTH</strong>, <strong>CF<small>₃</small>-MTTH</strong>, and <strong>CF<small>₃</small>-MTTM</strong>) are investigated using density functional theory (DFT) and time-dependent density functional theory (TD-DFT). The focus is placed on elucidating the white light emission mechanism of <strong>CF<small>₃</small>-HTTH</strong>, where a unique combination of excited-state intramolecular proton transfer (ESIPT) and excimer formation effectively generates triple fluorescence (Enol*, Keto*, and excimer). The ground-state and excited-state properties of the three systems are simulated, revealing that the enhanced intramolecular hydrogen bonding in <strong>CF<small>₃</small>-HTTH</strong> and <strong>CF<small>₃</small>-MTTH</strong> facilitates the ESIPT process. Both systems undergo a single ESIPT process, despite <strong>CF<small>₃</small>-HTTH</strong> having two potential proton transfer sites. Consequently, <strong>CF<small>₃</small>-HTTH</strong> and <strong>CF<small>₃</small>-MTTH</strong> emit blue (Enol*) and green (Keto*) fluorescence. In the excited state, the two <strong>CF<small>₃</small>-HTTH</strong> and <strong>CF<small>₃</small>-MTTM</strong> monomers approach each other and undergo parallel slippage, maximizing the π–π overlap area between the monomers. This increases intermolecular interactions, promoting excimer formation and resulting in red fluorescence emission. The effective synergy between ESIPT and excimer formation provides valuable theoretical guidance for the design of highly efficient single-molecule white light-emitting materials.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 19","pages":" 9644-9652"},"PeriodicalIF":5.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073511","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}

{"title":"Rational molecular doping to enhance interfacial carrier dynamics for reliable hole transport layer-free perovskite solar cells†","authors":"Yuanyuan Li, Xiao Wang, Jidong Deng, Qingming Huang, Kun Wei, Yinhu Gao, Yuliang Che, Xiaofeng Li, Ye Yang, Xiaoli Zhang, Jinbao Zhang and Li Yang","doi":"10.1039/D4TC05234J","DOIUrl":"https://doi.org/10.1039/D4TC05234J","url":null,"abstract":"<p >Charge selective contacts are critical in perovskite solar cells (PSCs) for charge dissociation, collection and transport. However, these layers can cause interfacial incompatibility and complicate the manufacturing process. To address these challenges, simplifying the PSC structure has become a key strategy. Although efforts have been made to develop hole transport layer (HTL)-free inverted PSCs, their photovoltaic performance has not yet matched that of conventional PSCs, and the mechanisms of interfacial charge dynamics in these simplified devices remain poorly understood. In this work, we propose a powerful strategy of rational molecular doping to optimize the interfacial energy-level alignment and carrier dynamics in PSCs. We demonstrate that the electron affinity of p-type organic molecules is pivotal in controlling perovskite crystallization and improving the quality of perovskite films, which in turn enhances interfacial charge collection and reduces carrier recombination losses. By doping with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), we significantly enhance the conductivity of perovskite films and strengthen the electronic contact with the conductive substrate. As a result, F4TCNQ-based HTL-free inverted PSCs achieve an impressive power conversion efficiency of 18.07%, surpassing the 9.75% of control devices. This study introduces an effective method for fabricating reliable HTL-free PSCs through rational molecular doping, laying the groundwork for further improvements in device performance.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 20","pages":" 10033-10041"},"PeriodicalIF":5.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117519","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}

{"title":"A low-power filamentary memristor crossbar array enabled via cubic α-phase stabilized mixed-cation lead halide perovskites†","authors":"In Hyuk Im, Ji Hyun Baek, Do Yeon Heo, Sung Hyuk Park, Sohyeon Park, Seung Ju Kim, Jae Young Kim, Youngmin Kim, Yoon Jung Lee, Kyung Ju Kwak, Hyeon Ji Lee, Soo Young Kim and Ho Won Jang","doi":"10.1039/D5TC00303B","DOIUrl":"https://doi.org/10.1039/D5TC00303B","url":null,"abstract":"<p >Halide perovskite (HP)-based resistive switching memory has demonstrated significant advantages, particularly in terms of rapid switching speed and low power consumption. To address the thermal instability associated with CH<small>₃</small>NH<small>₃</small><small>⁺</small> ions, which have been mainly focused on in related fields, we developed resistive switching memory utilizing distorted HPs (FA<small>_0.8</small>Cs<small>_0.2</small>PbI<small>₃</small>), incorporating thermally stable A-site cations. Moreover, we improved nonvolatility by introducing SCN anions to stabilize the cubic α-phase. Unlike the pristine FACsPbI<small>₃</small> (FCPI) device untreated by the SCN<small>⁻</small>-based additive, which features an α-phase/δ-phase heterostructure and exhibits unstable switching characteristics, the FCPI-SCN device demonstrates a stable cubic α-phase and extended retention behavior. After α-phase stabilization, trap-controlled emission becomes dominant in the FCPI-SCN device, confirming the stable filament formation through the HP layer. This strategic approach effectively suppresses the formation of heterostructures, reducing planar defects that serve as preferential sites for the multiple thin filament formation, thereby promoting stable filaments within the matrix. While pristine FCPI exhibits an unstable retention time of 40 s, FCPI-SCN demonstrates significantly improved performance including low operating voltages of 0.248 V/−0.116 V, a prolonged retention time of 11 000 s, and endurance over 1200 cycles. Additionally, we fabricated a 3 × 3 crossbar array with FCPI-SCN filamentary memristor devices. The crossbar array efficiently encodes and preserves letter-based bitmaps, thus showcasing its practical utility for reliable nonvolatile memory applications.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 20","pages":" 10310-10320"},"PeriodicalIF":5.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/tc/d5tc00303b?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117543","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}

{"title":"Ordered Co/Ni oxide nanostructures from MOFs: enhancing efficiency in hybrid asymmetric energy devices†","authors":"Xiaolong Leng, S. V. Prabhakar Vattikuti, Yumei Li, P. Rosaiah, Abdullah N. Alodhayb, Saravanan Pandiaraj, Burragoni Sravanthi Goud, Ganesh Koyyada, Jae Hong Kim, Nam Nguyen Dang and Jaesool Shim","doi":"10.1039/D5TC00922G","DOIUrl":"https://doi.org/10.1039/D5TC00922G","url":null,"abstract":"<p >MOF-derived metal oxides are promising electrode materials for energy storage due to their tunable porosity, large surface area, and versatile structures, which enhance electrochemical performance. However, their practical use is currently limited by poor conductivity and structural instability, requiring advanced modifications to circumvent this issue. This research investigates the synthesis of Co<small>₃</small>O<small>₄</small>/NiO nanostructures (MD-Co/Ni) derived from bimetallic metal–organic frameworks (Co/Ni-MOFs) with varying Co : Ni ratios (0.25 : 1, 0.5 : 1, 0.75 : 1, and 1 : 1) through thermal decomposition. The primary objective is to enhance energy storage efficiency. The study also examines how different Co : Ni ratios influence the electrochemical performance of the resulting nanostructures. The Co/Ni-MOF precursor was synthesized <em>via</em> a straightforward solvothermal method using trimesic acid (TA) as the ligand and polyvinylpyrrolidone (PVP) as a stabilizer. XRD analysis confirmed the high crystallinity of MD-Co/Ni nanostructures, while FE-SEM revealed its nanorod-/nanosheet-like morphology featuring rod-shaped nanoparticles. Electrochemical evaluations demonstrated that MD-Co/Ni achieved a superior specific capacitance (<em>C</em><small>_sp</small>) of 2836 F g<small>⁻¹</small> at 1 A g<small>⁻¹</small>, surpassing its pure bimetallic MOF counterparts. This improvement is credited to the synergistic effects of its bimetallic oxide composition, increased surface area from the meso-porous structure, and enhanced electron/ion transport pathways. Furthermore, a hybrid asymmetric supercapacitor (HS) was fabricated using MD-Co/Ni as the positive electrode. The device exhibited an exceptional energy density (<em>E</em><small>_d</small>) of 27.28 W h kg<small>⁻¹</small> at a power density (<em>P</em><small>_d</small>) of 380 W kg<small>⁻¹</small> and an outstanding working stability, retaining 80% capacitance and achieving a coulombic efficiency of 99.53% after 9500 cycles. These findings highlight the significant potential of thermally derived MOF-based nanostructures for futuristic energy storage systems.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 19","pages":" 9653-9666"},"PeriodicalIF":5.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073512","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}

{"title":"Dual ligand modification enabling bright and stable CsPbBr2.8Cl0.2 nanoplatelets in polar solvents†","authors":"Xiyan Li, Yongbo Ma, Wenda Sun, Beibei Tang, Huanxin Yang, Yachong Liu, Yue Li, Yiwei Wang, Xiangxiang Chen, Rui Yun, Wei Xiong, Libing Zhang and Mingjian Yuan","doi":"10.1039/D5TC00490J","DOIUrl":"https://doi.org/10.1039/D5TC00490J","url":null,"abstract":"<p >Strong quantum-confined nanoplatelets (NPLs) have emerged as one of the most promising materials for achieving blue emission. However, due to the ionic properties of the perovskite lattice, it thermodynamically exhibits no resistance to polar environments. Herein, the stable mixed halide blue NPLs with lateral dimensions of 12.59 nm under the polar solvent ethyl acetate are achieved by dual ligand engineering. H<small>⁺</small> released by HCl can be used to generate a more complete Pb–X and more protonated octylamine, thus etching imperfect nanocrystals with the help of HBr and ultimately regulating the growth of NPLs. Simultaneously, the anions isolated by DPH deamination can be tightly anchored to the lattice surfaces to saturate the defect sites and create a robust ligand shell, succeeding in a photoluminescence quantum yield (PLQY) of more than 90% from 465 nm to 495 nm. Therefore, the modified NPLs can be stably stored in ethyl acetate for 15 days with little decrease in fluorescence intensity and exhibit increased stability when exposed to ultraviolet radiation. This work offers novel perspectives on the production of mixed halide blue NPLs that are bright and stable in polar solvents.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 20","pages":" 10023-10032"},"PeriodicalIF":5.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117518","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}

{"title":"Sr/Ho-codoped (K0.5Na0.5)NbO3 photochromic-transparent ceramics in non-destructive optical data storage and multi-modal anti-counterfeiting†","authors":"Fangyuan Yu, Lixiang Deng, Yan Chen, Ping Zhou, Xiao Wu, Cong Lin, Chunlin Zhao, Min Gao, Tengfei Lin, Laihui Luo and Qiwei Zhang","doi":"10.1039/D5TC00331H","DOIUrl":"https://doi.org/10.1039/D5TC00331H","url":null,"abstract":"<p >Transparent-photochromic materials have garnered significant attention for their applications in optical information storage and anti-counterfeiting, which necessitate excellent transparency and high optical contrast. Herein, <em>x</em> mol% Sr<small>²⁺</small> and 1 mol% Ho<small>³⁺</small>-codoped (K<small>_0.5</small>Na<small>_0.5</small>)NbO<small>₃</small> (<em>x</em>Sr–1Ho–KNN) ceramics were synthesized by a conventional solid-state reaction and pressureless sintering. Notably, the 7Sr–1Ho–KNN ceramic displays exceptional transmittance (60.7% at 780 nm), attributed to its fine grains and highly symmetric crystal structure. The photochromic (PC) contrast based on the change in photoluminescence (PL) intensity of 7Sr–1Ho–KNN under excitation with a 980 nm laser reaches as high as 91.5%. After thermal treatment under appropriate conditions, the transmittance and PL intensity of the ceramic can revert to their respective original values, demonstrating superior optical stability in response to alternating light and thermal stimuli. The combination of high transparency and PC contrast suggests that the <em>x</em>Sr–1Ho–KNN ceramics have promising potential for optical information storage and optical anti-counterfeiting applications, which can guide the development of other KNN-based materials or even multifunctional luminescent ferroelectrics.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 20","pages":" 10321-10331"},"PeriodicalIF":5.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117525","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}

{"title":"Suppression of phase segregation in red CsPbIBr2-based perovskite LECs/LEDs: impact of Mn doping, crystallization control, and grain passivation†","authors":"Andrei S. Toikka, Ramazan Kenesbay, Maria Baeva, Dmitry M. Mitin, Maria Sandzhieva, Aleksandr Goltaev, Vladimir Fedorov, Alexander Pavlov, Dmitry Gets, Ivan Mukhin and Sergei Makarov","doi":"10.1039/D4TC05504G","DOIUrl":"https://doi.org/10.1039/D4TC05504G","url":null,"abstract":"<p >As alternatives to conventional perovskite light-emitting diodes, perovskite light-emitting electrochemical cells (PeLECs) are in great demand in modern science and technology due to their simplified structure and attainable higher luminance. Here, for the first time, we present the implementation and characterization of red CsPbIBr<small>₂</small>-based PeLECs/LEDs. To improve perovskite material phase stability, we applied the following strategies for mitigating the mixed anion lead halide perovskite phase segregation: Pb<small>²⁺</small> partial substitution by Mn<small>²⁺</small>, boundary passivation by poly(ethylene oxide) with polyvinylidene fluoride, and two-step thermal treatment with vacuuming and annealing. The complex measurements of photoluminescence, optical density, energy-dispersive X-ray spectroscopy, and X-ray diffraction confirm the minor phase segregation in the optimized perovskite layers. The performed <em>ab-initio</em> calculations predicted the band gaps of perovskite materials with a mixed anion composition, corresponding well to the results of optical measurements. Finally, current and electroluminescence time tracking proved the formation of a dynamic p–i–n structure in the studied PeLEC devices. The developed PeLECs/LEDs exhibited relatively high, for red PeLECs, electroluminescence up to 96 cd m<small>⁻²</small> with a peak position at 667–672 nm.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 21","pages":" 10740-10749"},"PeriodicalIF":5.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144171134","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}

{"title":"A self-powered photodetector of SnSeS/p-Si heterojunction with high-performance†","authors":"Yujuan Pei, Miaoran Kang, Weilong Deng, Qiang Fu, Xiangyu Fan, Yu Sui, Jubei Hu, Mengting Liu, Xianjie Wang and Bo Song","doi":"10.1039/D5TC00243E","DOIUrl":"https://doi.org/10.1039/D5TC00243E","url":null,"abstract":"<p >Two-dimensional transition metal dichalcogenides have attracted great interest in recent years due to their excellent photoelectric properties. The lateral photovoltaic (LPV) properties of SnSeS/p-Si heterojunctions are investigated in this paper. The quality of the SnSeS film prepared using pulsed laser deposition is demonstrated through the use of X-ray diffraction, Raman, and X-ray photoelectron spectra. Both large position sensitivity (236 mV mm<small>⁻¹</small>) and an ultrafast relaxation time of 0.48 μs of LPV under 532 nm laser irradiation are observed in a SnSeS/p-Si heterojunction at room temperature. The position sensitivity of the LPV in the SnSeS/p-Si heterojunction shows a weak dependence on the laser wavelength from 405 to 808 nm. The SnSeS/p-Si heterojunction is utilized to establish an optical communication system with a photoelectrical bandwidth of up to 20 kHz. Our findings highlight the significant potential of the SnSeS/p-Si heterojunction photodetector as a promising candidate for next-generation optoelectronic materials in optical communication and self-powered position-sensitive detectors.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 19","pages":" 9513-9519"},"PeriodicalIF":5.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073558","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}

{"title":"Efficiency optimization of BaY2Al2−yScyGa2SiO12:xCr3+ garnet phosphors with sustained anti-thermal quenching behavior†","authors":"Haiyan Shi, Yan Yuan, Desheng Yin, Xiaohong Zhang, Pengbo Lyu, Changfu Xu and Lizhong Sun","doi":"10.1039/D5TC00698H","DOIUrl":"https://doi.org/10.1039/D5TC00698H","url":null,"abstract":"<p >Systematic studies on optimizing the efficiency of garnet phosphors while preserving their anti-thermal quenching behavior remain limited. In this study, we explore the garnet-structured BaY<small>₂</small>Al<small>_{2−<em>y</em>}</small>Sc<small>_<em>y</em></small>Ga<small>₂</small>SiO<small>₁₂</small>:<em>x</em>Cr<small>³⁺</small> phosphor system, emphasizing the critical role of crystal field modulation in achieving this balance. For <em>y</em> = 0, the optimized BaY<small>₂</small>Al<small>_1.95</small>Ga<small>₂</small>SiO<small>₁₂</small>:0.05Cr<small>³⁺</small> phosphor exhibits broadband deep-red and near-infrared (NIR) emission, with an internal quantum efficiency (IQE) of 73%, an external quantum efficiency (EQE) of 13%, and a luminescence intensity that reaches 108% of its room-temperature value at 150 °C, demonstrating a pronounced anti-thermal quenching behavior. This desired property arises from the thermal population shift of the dominant excited states from the <small>²</small>E to <small>⁴</small>T<small>₂</small> state with increasing temperature. With <em>y</em> &gt; 0, the systematic substitution of Al<small>³⁺</small> with Sc<small>³⁺</small> induces greater structural distortion around Cr<small>³⁺</small> ions, optimizing the crystal field environment, broadening NIR emission, and further enhancing luminescence efficiency. The optimized composition, BaY<small>₂</small>Al<small>_1.5</small>Sc<small>_0.5</small>Ga<small>₂</small>SiO<small>₁₂</small>:0.05Cr<small>³⁺</small>, achieves an impressive IQE of 82%, an EQE of 25% and maintains 104% of its luminescence intensity at 150 °C. A NIR pc-LED with a remarkable output power of 241 mW@300 mA was fabricated using this phosphor, enabling the capture of high-quality finger vein images. This demonstration confirms the feasibility of these phosphors for biometric authentication and other advanced NIR applications.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 20","pages":" 10271-10281"},"PeriodicalIF":5.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117540","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}