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Aggregation induced emission of azobenzene towards a sensitive indication on the self-assembly of cellulose material 偶氮苯的聚集诱导发射,用于灵敏显示纤维素材料的自组装情况
IF 7 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-11 DOI: 10.1039/d4qm00542b
Jingjing Gu, Guoqiang Zhang, Jiahao Chang, Lei Zhang, Zhongtao Wu, Xiliang Luo, Hao Wang
Azobenzene is one of the most commonly used photochromic molecules, which is rarely used as the fluorescence probe in materials chemistry, due to its competitive light energy consumption from the efficient photoisomerization. In this study, an azobenzene-containing ammonium surfactant is designed for fabricating an ionic celluloe material through an electrostatic complexation with carboxymethyl cellulose. Based on the AIE effect of azobenzene motif, such a cellulose material exhibits fluorescence property. Furthermore, in aqueous condition the self-assembly state of this cellulose material could be well regulated by the azobenzene isomerization under UV/Vis irradiation, which results in a remarkable fluorescence intensity change. As compared to the commonly used UV-Vis absorption, the fluorescence change of azobenzene provides a more sensitive indication for tracking the dissolving and precipitation of the ionic cellulose-surfactant assemblies in aqueous condition. This work provides a useful strategy for fabricating photoresponsive fluorescent biomaterials based on azobenzene, opening a new opportunity for detecting the drug loading materials.
偶氮苯是最常用的光致变色分子之一,但由于其高效光异构化产生的竞争性光能消耗,很少被用作材料化学中的荧光探针。本研究设计了一种含偶氮苯的铵表面活性剂,用于通过与羧甲基纤维素的静电络合制造离子型纤维素材料。基于偶氮苯图案的 AIE 效应,这种纤维素材料具有荧光特性。此外,在水溶液条件下,这种纤维素材料的自组装状态可在紫外/可见光照射下通过偶氮苯异构化得到很好的调节,从而产生显著的荧光强度变化。与常用的紫外可见吸收法相比,偶氮苯的荧光变化为跟踪水溶液条件下离子型纤维素-表面活性剂组装体的溶解和沉淀提供了更灵敏的指示。这项工作为制造基于偶氮苯的光致荧光生物材料提供了一种有用的策略,为检测药物负载材料提供了一个新的机会。
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引用次数: 0
Exploring electrode/polymer electrolyte interface chemistry and a regulating strategy of interfacial stability: a review 探索电极/聚合物电解质界面化学和界面稳定性调节策略:综述
IF 7 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-11 DOI: 10.1039/d4qm00219a
Shuru Wu, Chenyu Wang, Shuanghui Li, Jingzheng Weng
Polymer electrolytes have garnered considerable interest as a promising substitute owing to their exceptional mechanical flexibility, and appropriate interfacial compatibility with electrodes. However, the realization of economically viable and industrially scalable solid-state batteries with an elevated energy density and reliable cycling life remains a formidable task. The integration of high-voltage cathodes presents additional challenges, such as polymer electrolyte decomposition, consequential gas discharge, and the formation of an unstable solid–electrolyte interphase (SEI) layer on the lithium metal anode. These issues significantly impact the battery's cycling life and safety, necessitating profound attention towards enhancing the electrochemical stability of polymer electrolytes. Within this comprehensive review, we explore the problems arising from the evolution of the electrolyte/cathode and electrolyte/anode interfaces (e.g., electrochemical decomposition of the electrolyte, reverse cation catalysis, degradation products, etc.), and propose corresponding interfacial remediation strategies (e.g., in situ polymerization, inorganic coatings, etc.). Finally, we describe the persistent challenges and future perspectives aimed at providing strategies for the development of innovative polymer electrolytes capable of realizing high-performance lithium-metal batteries.
聚合物电解质因其卓越的机械柔韧性以及与电极适当的界面兼容性,作为一种前景广阔的替代品而备受关注。然而,实现经济上可行、工业上可扩展、能量密度高且循环寿命可靠的固态电池仍然是一项艰巨的任务。高压正极的集成带来了更多挑战,如聚合物电解质分解、随之而来的气体放电,以及在锂金属阳极上形成不稳定的固电解质间相(SEI)层。这些问题严重影响了电池的循环寿命和安全性,因此有必要深入研究如何提高聚合物电解质的电化学稳定性。在这篇综述中,我们探讨了电解质/阴极和电解质/阳极界面演变过程中产生的问题(如电解质的电化学分解、反向阳离子催化、降解产物等),并提出了相应的界面修复策略(如原位聚合、无机涂层等)。最后,我们介绍了持续存在的挑战和未来展望,旨在为开发能够实现高性能锂金属电池的创新聚合物电解质提供策略。
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引用次数: 0
Thermoelectric performance of organic conductors 有机导体的热电性能
IF 7 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-10 DOI: 10.1039/d4qm00466c
Takehiko Mori
Organic polymers such as poly(ethylenedioxythiophene): polystyrenesulfonate (PEDOT: PSS) have attracted attention as thermoelectric materials, but charge-transfer complexes have not been explored sufficiently though these materials show very high conductivity and even superconductivity. Here, the power factors of representative organic metals and superconductors are estimated down to low temperatures. Several metallic conductors show power factors comparable to PEDOT: PSS (3 μW cm-1 K-2), when the metallic conductivity is maintained down to low temperatures. In particular, Cu(DMDCNQI)2, where DMDCNQI is dimethyldicyanoquinonediimine, exhibits a power factor as large as 95 μW cm-1 K-2 and Peltier conductivity of 3.7 A cm-1 K-1 around 36 K, which are comparable to the conventional inorganic thermoelectric materials. Since this is attributed to the participation of the Cu flat band and the resulting three-dimensional energy band, the use of metal complexes is a promising strategy to explore high-performance thermoelectric materials. Thermoelectric power has been evaluated from the band structure, but conductivity anisotropy is calculated, and relaxation time is estimated by the combined use of the observed conductivity.
聚(乙烯二氧噻吩):聚苯乙烯磺酸盐(PEDOT:PSS)等有机聚合物作为热电材料备受关注,但电荷转移复合物尚未得到充分探索,尽管这些材料显示出极高的导电性甚至超导性。本文估算了代表性有机金属和超导体在低温下的功率因数。几种金属导体的功率因数与 PEDOT:PSS(3 μW cm-1 K-2)相当。其中,Cu(DMDCNQI)2(其中 DMDCNQI 是二甲基二氰醌二亚胺)在 36 K 左右的功率因数高达 95 μW cm-1 K-2,珀尔帖电导率为 3.7 A cm-1 K-1,与传统的无机热电材料相当。这归功于铜平带和由此产生的三维能带的参与,因此使用金属复合物是探索高性能热电材料的一种有前途的策略。根据能带结构评估了热电功率,但计算了电导率各向异性,并结合使用观测到的电导率估算了弛豫时间。
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引用次数: 0
Ultrafast and high-resolution X-ray imaging based on zero-dimensional organic silver halides 基于零维有机卤化银的超快高分辨率 X 射线成像技术
IF 7 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-10 DOI: 10.1039/d4qm00362d
Yongqiang Zhou, Zixian Wang, Linfeng Guo, Lei Huang, Yichen Liu, Mengyue Wu, Qian Zhang, Kang An, Peng He, Fei Wang, Juan Du, Zhengzheng Liu, Zhiping Hu, Yuxin Leng, Yayun Pu, Jun'an Lai, Xiaosheng Tang
Supersensitive and fast X-ray imaging is of great importance in medical diagnosis, industrial flaw detection, security & safety inspection, and frontier science exploration. As the core of detection devices, new generation scintillators require small self-absorption capacity, short fluorescence lifetime, simple film-making protocol, excellent stability and non-toxicity. Herein, new type lead-free organic silver halides TPPAgX2 (TPP = C24H20P, X = I, Br, Cl) are rationally developed with large Stokes shift and ultralow photoluminescence decay (3.8 ns lifetime). It realizes an ultrafast fluorescent response that is the best among all the Pb-free perovskite scintillators. Temperatures-dependent PL and DFT calculations together confirm that TPPAgCl2 follows an emission mechanism that triplet exciton can be rapidly upconverted by thermal activation. A series of TPPAgX2-based flexible scintillator film were fabricated and tested. The detection limit of 0.447 μGyair/s were obtained for the TPPAgCl2, which is one order of magnitude lower than medical X-ray diagnosis requirement. In addition, it exhibits superior X-ray imaging resolution of 11.87 lp/mm. The excellent performances and simple preparation methodology are expected to be potentially applicable for large-scale manufacturing.
超灵敏、快速的 X 射线成像在医疗诊断、工业探伤、安检、安全检测和前沿科学探索等领域具有重要意义。作为探测设备的核心,新一代闪烁体要求自吸收能力小、荧光寿命短、制膜工艺简单、稳定性好且无毒。本文合理开发了新型无铅有机卤化银 TPPAgX2(TPP = C24H20P,X = I、Br、Cl),具有较大的斯托克斯位移和超低的光致发光衰减(3.8 ns 寿命)。它实现了超快荧光响应,是所有无铅闪烁体中最好的。随温度变化的 PL 和 DFT 计算共同证实,TPPAgCl2 遵循一种发射机制,即三重激子可通过热激活迅速上转换。我们制作并测试了一系列基于 TPPAgX2 的柔性闪烁体薄膜。TPPAgCl2 的检出限为 0.447 μGyair/s,比医疗 X 射线诊断要求低一个数量级。此外,它的 X 射线成像分辨率高达 11.87 lp/mm。其优异的性能和简单的制备方法有望用于大规模生产。
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引用次数: 0
A Heterocyclic Strategy for Regulating the Proportion of Type I and Type II of Photodynamic Therapy 调节光动力疗法 I 型和 II 型比例的杂环策略
IF 7 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-04 DOI: 10.1039/d4qm00399c
Hui Tang, Ning Ma, Xiaochun Liu, Shiyu Wu, Hairong Li, Kangyao Chen, Yitong Jiang, Yahui Zhang, Zhouyu Wang, Xiao-Qi Yu
Type I photosensitizers (PSs) of photodynamic therapy (PDT) are advanced because they can produce cytotoxic reactive oxygen species (ROS) through electron transfer even in hypoxic environments. However, this process is more difficult than that of Type II process via energy transfer. Herein, we report a facile and effective strategy for regulating the proportion of two types of PSs by converting Type II PSs to Type I PSs through the introduction of heterocyclic rings. Three tetraphenyl-1,3-butadiene (TPB) derivatives were obtained, each with a different “bridge”: benzene (TPP), thiophene (TPS), and furan (TPO), forming typical D-A structures. Compared with TPP, electron-rich heterocyclic derivatives, TPS and TPO can produce more ROS, with Type I accounting for a higher proportion. This is because the lone pair of electrons can enhance the intersystem crossing and electron transfer. Systematic and detailed experimental and theoretical calculations prove the proposal herein: (Yield of ROS) TPO > (Yield of ROS) TPS > (Yield of ROS) TPP and (Proportion of Type I ROS) TPO > (Proportion of Type I ROS) TPS > (Proportion of Type I ROS) TPP. This strategy serves as an avenue for new PSs and lays a foundation for the design of pure Type I PSs.
光动力疗法(PDT)的第一类光敏剂(PSs)之所以先进,是因为它们即使在缺氧环境中也能通过电子传递产生具有细胞毒性的活性氧(ROS)。然而,这一过程比通过能量转移的第二类过程更加困难。在此,我们报告了一种简便有效的策略,通过引入杂环将 II 型 PS 转换为 I 型 PS,从而调节两种 PS 的比例。我们得到了三种四苯基-1,3-丁二烯(TPB)衍生物,每种衍生物都有不同的 "桥":苯(TPP)、噻吩(TPS)和呋喃(TPO),形成了典型的 D-A 结构。与富含电子的杂环衍生物 TPP 相比,TPS 和 TPO 能产生更多的 ROS,其中 I 型所占比例更高。这是因为孤对电子能增强系统间的交叉和电子转移。系统而详细的实验和理论计算证明了本文的建议:(ROS 的产量) TPO > (ROS 的产量) TPS > (ROS 的产量) TPP 和 (I 型 ROS 的比例) TPO > (I 型 ROS 的比例) TPS > (I 型 ROS 的比例) TPP。这一策略为新的 PS 提供了途径,并为纯 I 型 PS 的设计奠定了基础。
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引用次数: 0
Tuning organic ligands to optimize the nitrogen reduction performance of Co(II) or Ni(II)‐based MOFs 调整有机配体以优化基于 Co(II) 或 Ni(II) MOFs 的氮还原性能
IF 7 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-03 DOI: 10.1039/d4qm00418c
Ling Qin, Ying-Xin Zhao, Qiang Liu, Jin-Long An, Han-Xi Wang, Maofeng Zhang, Chengwu Shi, Hegen Zheng
Electrocatalytic nitrogen reduction to ammonia reaction (eNRR) can use clean energy and catalyst materials to convert N2 to NH3 under relatively mild reaction conditions, but how to design and establish an efficient NH3 production system has been the focus of eNRR research. Metal-organic frameworks (MOFs) are a class of crystalline porous materials with high specific surface area, high porosity and designable structure, which show great potential as new electrocatalysts. However, the inherent low conductivity and low stability of MOFs materials have greatly hindered their further application in the field of electrocatalysis. How to design and synthesize highly stable and highly conductive MOFs materials, regulate the energy of MOFs eNRR reaction intermediates and the adsorption strength of active species is the key to improve the electrocatalytic performance. Hence, five Co-MOFs with similar structure were designed to investigate the effect of small changes in organic ligand structure on nitrogen reduction performance. Among, Co-MOF based on thiazole ligand has the best eNRR performance, with the highest NH3 yield (51.30 µg·h-1·mgcat-1) and Faraday efficiency (29.2%) at -0.4 V vs. RHE. The tuning of organic ligands to optimize the nitrogen reduction to ammonia activity is further revealed in this work, which can provide theoretical guidance for the design and development of high-performance eNRR electrocatalysts in the future.
电催化氮还原成氨反应(eNRR)可利用清洁能源和催化剂材料,在相对温和的反应条件下将N2转化为NH3,但如何设计和建立高效的NH3生产系统一直是eNRR研究的重点。金属有机框架(MOFs)是一类具有高比表面积、高孔隙率和可设计结构的结晶多孔材料,作为新型电催化剂显示出巨大的潜力。然而,MOFs 材料固有的低导电性和低稳定性极大地阻碍了其在电催化领域的进一步应用。如何设计和合成高稳定性、高导电性的MOFs材料,调节MOFs eNRR反应中间体的能量和活性物种的吸附强度,是提高电催化性能的关键。因此,我们设计了五种结构相似的 Co-MOF,研究有机配体结构的微小变化对氮还原性能的影响。其中,基于噻唑配体的 Co-MOF 具有最佳的 eNRR 性能,在 -0.4 V 与 RHE 相比时,NH3 产量(51.30 µg-h-1-mgcat-1)和法拉第效率(29.2%)最高。这项工作进一步揭示了如何通过调节有机配体来优化氮还原成氨的活性,为今后设计和开发高性能 eNRR 电催化剂提供了理论指导。
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引用次数: 0
Outstanding Reviewers for Materials Chemistry Frontiers in 2023 2023 年《材料化学前沿》杰出审稿人
IF 7 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-03 DOI: 10.1039/d4qm90038c
We would like to take this opportunity to thank all of Materials Chemistry Frontiers’ reviewers for helping to preserve quality and integrity in chemical science literature. We would also like to highlight the Outstanding Reviewers for Materials Chemistry Frontiers in 2023.
我们想借此机会感谢《材料化学前沿》的所有审稿人,感谢他们帮助维护化学科学文献的质量和完整性。我们还想重点介绍 2023 年材料化学前沿的杰出审稿人。
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引用次数: 0
MoS2 nanosheets coupled on Ti3C2Tx prepared by molten salt etching for enhancing lithium storage performance 用熔盐蚀刻法制备耦合在 Ti3C2Tx 上的 MoS2 纳米片,以提高锂存储性能
IF 7 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-03 DOI: 10.1039/d4qm00388h
Guoyong Huang, Shaochen Wang, Chenwei Qu, Xin Wang, Daoyong Lin, Tiantian Cao, Shengming Xu
Molybdenum disulfide (MoS2) has great potential as an anode material for lithium-ion batteries due to its graphite-like layered structure and high specific capacity (669.0 mAh·g-1). However, challenges such as volume expansion during lithium storage have impeded its utilization. The combined alteration of MoS2 and MXenes has demonstrated its efficacy as a modification technique. In this study, a green and facile phase engineering strategy has been implemented for the synthesis of MoS2/Ti3C2Tx nanocomposites. The Ti3C2Tx was rapidly prepared by the fluorine-free molten salt etching method, and then the MoS2/Ti3C2Tx composite was synthesized by the one-pot method. Fluffy and open petal-like interconnect structures were constructed by combining few-layer MoS2 nanosheets with Ti3C2Tx substrate. The introduction of the substrate material (Ti3C2Tx) provides a uniform growth platform for MoS2 nanosheets, and Ti3C2Tx, acting as the supporting material, imparts enhanced structural stability to the composite. Theoretical calculations indicate that this configuration may result in a reduction of the diffusion energy barrier of Li+ from 0.78 eV to 0.19 eV, as well as an enhanced electron transfer. This composite material exhibits enhanced capacity performance, achieving 460.6 mAh·g-1 at 0.1 A·g-1 after 100 cycles. This approach offers valuable insights into the synthesis of additional high-performance composite materials.
二硫化钼(MoS2)具有类似石墨的层状结构和高比容量(669.0 mAh-g-1),因此作为锂离子电池的负极材料具有巨大潜力。然而,锂储存过程中的体积膨胀等挑战阻碍了它的利用。MoS2 和 MXenes 的联合改变已证明了其作为一种改性技术的功效。本研究采用了一种绿色、简便的相工程策略来合成 MoS2/Ti3C2Tx 纳米复合材料。通过无氟熔盐刻蚀法快速制备了 Ti3C2Tx,然后采用一锅法合成了 MoS2/Ti3C2Tx 复合材料。通过将几层 MoS2 纳米片与 Ti3C2Tx 衬底结合,构建了蓬松开放的花瓣状互连结构。基底材料(Ti3C2Tx)的引入为 MoS2 纳米片提供了一个均匀的生长平台,而作为支撑材料的 Ti3C2Tx 则增强了复合材料的结构稳定性。理论计算表明,这种配置可将 Li+ 的扩散能垒从 0.78 eV 降低到 0.19 eV,并增强电子转移。这种复合材料显示出更强的容量性能,在 0.1 A-g-1 条件下循环 100 次后可达到 460.6 mAh-g-1。这种方法为合成其他高性能复合材料提供了宝贵的启示。
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引用次数: 0
Lignin-based adaptable covalently cross-linked fabric for flexible sensors 用于柔性传感器的木质素基适应性共价交联织物
IF 7 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-02 DOI: 10.1039/d4qm00286e
Xiaozhen Ma, Xiaolin Wang, Honglong Zhao, Minghui Cui, Xiaobo Xu, Fangfang Kong, Peng Chen, Ning Yan, Jin Zhu, Jing Chen
In this study, we successfully upcycled a novel lignin-based covalent adaptable polyurethane elastomer (LPUE) that we previously synthesized into a graphene-composited covalent adaptable lignin-based polyurethane fabric (LPUF). This fabric exhibited outstanding solvent resistance, toughness (LPUF-0 with a tensile strength of 29.1 ± 1.6 MPa, an elongation at break of 653 ± 67%, and a toughness of 103 ± 3.8 mJ m−3), and deformation responsiveness. These results not only open up new possibilities for improving covalently adaptable networks in fabrics, but also pave the way for developing solvent-resistant, wearable sensing devices.
在这项研究中,我们成功地将之前合成的新型木质素共价适应性聚氨酯弹性体(LPUE)升级再造为石墨烯复合共价适应性木质素基聚氨酯织物(LPUF)。这种织物具有出色的耐溶剂性、韧性(LPUF-0 的拉伸强度为 29.1 ± 1.6 MPa,断裂伸长率为 653 ± 67%,韧性为 103 ± 3.8 mJ m-3)和变形响应性。这些结果不仅为改进织物中的共价适应性网络提供了新的可能性,而且为开发耐溶剂的可穿戴传感设备铺平了道路。
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引用次数: 0
Design of Cr3+-activated broadband NIR phosphors with tunable and abnormal thermal quenching behavior for NIR pc-LEDs 为近红外 pc-LED 设计具有可调异常热淬灭行为的 Cr3+ 激活型宽带近红外荧光粉
IF 7 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-01 DOI: 10.1039/d4qm00395k
Qijian Zhu, Jiansheng Huo, Quwei Ni, Qiuhong Zhang, Junhao Li, Haiyong Ni, Jianbang Zhou
Cr3+-activated broadband near-infrared (NIR) phosphors usually show controllable and excellent photoluminescence (PL) properties, but their poor thermal stability remains a big challenge. Herein, a series of Lu3-xCaxGa5-xSixO12:Cr3+ garnet phosphors with tunable and abnormal thermal quenching performance has been successfully proposed. It is found that both the crystal field strength and calculated energetic difference between 4T2 and 2E states decrease obviously with increasing [Ca2+-Si4+] co-substitution, resulting in the thermal occupation of 4T2 state and broadened PL spectra. More importantly, the Lu3-xCaxGa5-xSixO12:Cr3+ phosphors show improved PL thermal stability depending on the different thermal population between 4T2 and 2E states, and the mechanism is investigated in detail. The PL intensity of optimal sample reaches up to 125% and 121% at 425 K and 475 K compared with that at 300 K, respectively, which is much better than most Cr3+-activated broadband NIR phosphors. A NIR phosphor-converted light-emitting diode (NIR pc-LED) has been fabricated using the as-prepared thermally stable phosphor and its application in bio-imaging and night vision is demonstrated.
Cr3+激活的宽带近红外(NIR)荧光粉通常具有可控和优异的光致发光(PL)特性,但其较差的热稳定性仍然是一个巨大的挑战。本文成功地提出了一系列具有可调且异常热淬灭性能的 Lu3-xCaxGa5-xSixO12:Cr3+ 石榴石荧光粉。研究发现,随着[Ca2+-Si4+]共取代度的增加,4T2态和2E态之间的晶体场强和计算能量差都明显减小,从而导致4T2态的热占据和更宽的聚光光谱。更重要的是,Lu3-xCaxGa5-xSixO12:Cr3+ 磷光体显示出更好的 PL 热稳定性,这取决于 4T2 和 2E 态之间不同的热容量,并对其机理进行了详细研究。与 300 K 时相比,最佳样品在 425 K 和 475 K 时的聚光强度分别达到 125% 和 121%,远远优于大多数 Cr3+ 激活的宽带近红外荧光粉。利用制备的热稳定荧光粉制作了近红外荧光粉转换发光二极管(NIR pc-LED),并展示了它在生物成像和夜视中的应用。
{"title":"Design of Cr3+-activated broadband NIR phosphors with tunable and abnormal thermal quenching behavior for NIR pc-LEDs","authors":"Qijian Zhu, Jiansheng Huo, Quwei Ni, Qiuhong Zhang, Junhao Li, Haiyong Ni, Jianbang Zhou","doi":"10.1039/d4qm00395k","DOIUrl":"https://doi.org/10.1039/d4qm00395k","url":null,"abstract":"Cr3+-activated broadband near-infrared (NIR) phosphors usually show controllable and excellent photoluminescence (PL) properties, but their poor thermal stability remains a big challenge. Herein, a series of Lu3-xCaxGa5-xSixO12:Cr3+ garnet phosphors with tunable and abnormal thermal quenching performance has been successfully proposed. It is found that both the crystal field strength and calculated energetic difference between 4T2 and 2E states decrease obviously with increasing [Ca2+-Si4+] co-substitution, resulting in the thermal occupation of 4T2 state and broadened PL spectra. More importantly, the Lu3-xCaxGa5-xSixO12:Cr3+ phosphors show improved PL thermal stability depending on the different thermal population between 4T2 and 2E states, and the mechanism is investigated in detail. The PL intensity of optimal sample reaches up to 125% and 121% at 425 K and 475 K compared with that at 300 K, respectively, which is much better than most Cr3+-activated broadband NIR phosphors. A NIR phosphor-converted light-emitting diode (NIR pc-LED) has been fabricated using the as-prepared thermally stable phosphor and its application in bio-imaging and night vision is demonstrated.","PeriodicalId":86,"journal":{"name":"Materials Chemistry Frontiers","volume":null,"pages":null},"PeriodicalIF":7.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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