Dyes and Pigments最新文献_第10页

PLGA nanoplatform loading with NIR-activated D-π-A chromophores for combined chemo-photothermal therapy 负载nir活化D-π-A发色团的PLGA纳米平台用于化学-光热联合治疗

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments

Pub Date : 2025-12-02 DOI: 10.1016/j.dyepig.2025.113444

Xiaohan Duan , Fang Wang , Fanling Zhang , Hongqian Chu , Qingbo Su , Yuechen Liu , Pengwei Li , Bei Liu , Shuhui Bo

While photothermal therapy (PTT) demonstrates significant clinical promise for oncological applications, the development of photothermal agents activatable in the near-infrared (NIR) window with enhanced tissue penetration remains a persistent challenge. To address this limitation, we engineered a novel D-π-A structured chromophore (BLD4) exhibiting intense NIR absorption at 808 nm accompanied by exceptional photothermal conversion performance. Through a nano-precipitation strategy, we successfully co-encapsulated BLD4 with the chemotherapeutic agent doxorubicin (DOX) into poly (lactic-co-glycolic acid) (PLGA) matrices, yielding monodisperse nanospheres (BLD4/DOX@PLGA) with an average diameter of 254 nm. The engineered nanoparticles demonstrated remarkable colloidal stability under physiological conditions, superior photothermal conversion efficiency (η = 40.21 %), and pH-responsive drug release characteristics. In vivo photothermal imaging demonstrated that BLD4/DOX@PLGA nanoparticles effectively accumulated in tumor tissues, achieving a peak temperature of 50 °C under laser irradiation. In vitro and in vivo results confirmed that BLD4/DOX@PLGA nanoparticles enabled efficient NIR laser-triggered photothermal imaging-guided PTT/chemotherapy, presenting a promising strategy for deep-tissue tumor treatment.

虽然光热疗法（PTT）在肿瘤学应用中具有重要的临床前景，但开发可在近红外（NIR）窗口激活并增强组织穿透的光热剂仍然是一个持续的挑战。为了解决这一限制，我们设计了一种新的D-π-A结构发色团（BLD4），它在808 nm处具有强烈的近红外吸收，并具有优异的光热转换性能。通过纳米沉淀策略，我们成功地将BLD4与化疗药物阿霉素（DOX）共封装到聚乳酸-羟基乙酸（PLGA）基质中，得到平均直径为254 nm的单分散纳米球（BLD4/DOX@PLGA）。在生理条件下，纳米颗粒具有良好的胶体稳定性、光热转化效率（η = 40.21%）和ph响应药物释放特性。体内光热成像显示，BLD4/DOX@PLGA纳米颗粒在肿瘤组织中有效积累，在激光照射下峰值温度可达50℃。体外和体内实验结果证实，BLD4/DOX@PLGA纳米颗粒可实现高效的近红外激光触发光热成像引导PTT/化疗，为深部组织肿瘤治疗提供了一种有前景的策略。

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引用次数: 0

Enhancing the performance of triazatruxene-based D-π-A organic dyes containing different π-spacer for dye-sensitized solar cells applications: DFT/TD-DFT study 提高含不同π-间隔剂的三氮祖蒽基D-π-A有机染料染料敏化太阳能电池的性能：DFT/TD-DFT研究

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments

Pub Date : 2025-12-02 DOI: 10.1016/j.dyepig.2025.113437

Alioui Abdelaaziz , Driss Fadili , My Slimane Slimani , El bachir Ettahiri , Si Mohamed Bouzzine , Mohamed Hamidi

To advance high-performance dye-sensitized solar cells (DSSCs), a thorough approach to forecasting molecular energy conversion efficiency and creating new sensitizers is crucial. Building on our prior investigation of the highly efficient D-π-A triazatruxene dye TATC, which achieved an impressive power conversion efficiency (PCE) of 27 %, we designed five new dyes (TAT-10 to TAT-14). These were developed by substituting the thiophene unit in the π-bridge between 2,2-dimethyl-2H-benzo[d]imidazole and the acceptor with a variety of five-membered rings: 4H-pyrazole (TAT-10), 4H-1,2-oxazole (TAT-11), 4H-1,2-thiazole (TAT-12), 4H-disilazole (TAT-13), and 1H-silole (TAT-14). We employed density functional theory (DFT) and time-dependent DFT (TD-DFT) to analyze the geometric structures, absorption spectra, and photophysical and photovoltaic properties of these dyes. The theoretical analysis indicates that TAT-13 excels compared to the others, exhibiting superior short-circuit photocurrent density (J_SC) due to its higher incident photon-current efficiency (IPCE), a narrower HOMO-LUMO band gap, enhanced electron injection driving force (ΔG^inject), strong and broad absorption spectra, improved intramolecular charge transfer (ICT) properties, and lower regeneration driving force (ΔG^reg) and reorganization energy (λ_total). The comprehensive evaluation forecasts a PCE of 28.63 % for TAT-13, with J_SC = 40.92 mA/cm², fill factor (FF) = 0.7821, and open-circuit voltage (Voc) = 0.8945 V. These results offer valuable theoretical guidance for designing potential organic sensitizers for highly efficient DSSCs.

为了发展高性能染料敏化太阳能电池（DSSCs），预测分子能量转换效率和创造新的敏化剂是至关重要的。在我们之前研究的D-π-A三氮杂蒽染料TATC的基础上，我们设计了五种新的染料（TAT-10至TAT-14），其功率转换效率达到了27%。这些化合物是通过将2,2-二甲基- 2h -苯并咪唑与受体之间的π桥上的噻吩单元替换为各种五元环：4h -吡唑（TAT-10）、4h -1,2-恶唑（TAT-11）、4h -1,2-噻唑（TAT-12）、4h -二硅唑（TAT-13）和1h -硅酮（TAT-14）。利用密度泛函理论（DFT）和时间依赖DFT （TD-DFT）分析了这些染料的几何结构、吸收光谱以及光物理和光伏性质。理论分析表明，TAT-13具有较高的入射光电流效率（IPCE）、较窄的HOMO-LUMO带隙、增强的电子注入驱动力（ΔGinject）、强而宽的吸收光谱、改善的分子内电荷转移（ICT）性能、较低的再生驱动力（ΔGreg）和重组能（λtotal），因此具有优越的短路光电流密度（JSC）。综合评价预测tat13的PCE为28.63%,JSC = 40.92 mA/cm2，填充因子(FF) = 0.7821，开路电压(Voc) = 0.8945 V。这些结果为设计高效DSSCs的潜在有机增敏剂提供了有价值的理论指导。

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引用次数: 0

Effect of donors on intramolecular photoinduced charge-transfer in π-conjugated donor-acceptor solutions for solar cells applications 应用于太阳能电池的π共轭给体-受体溶液中给体对分子内光诱导电荷转移的影响

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments

Pub Date : 2025-12-02 DOI: 10.1016/j.dyepig.2025.113473

Amani A. Alsam

Photoinduced charge transfer kinetics are essential in assessing the appropriateness of organic materials for solar cell applications. This study utilized femtosecond-to-microsecond time-resolved spectroscopy to examine the excited-state kinetics of a series of π-conjugated donor–acceptor polymers featuring the potent electron-withdrawing unit ((E)-1,2-di(thiazol-2-yl) diazene) (ATZ) alongside three distinct donor moieties: thieno [3,2-b] thiophene (TT), 2,2′-bithiophene (BT), and (E)-1,2-di(thiophen-2-yl) ethene (DTV). Steady-state absorption, fluorescence, density functional theory (DFT) calculations, and transient absorption (TA) spectroscopy were conducted to clarify their photophysical behavior in the presence of 1,4-dicyanobenzene (DCB), a recognized electron acceptor. The findings indicate that intramolecular charge transfer from the donor segments (TT, BT, and DTV) to DCB predominates the excited-state deactivation mechanisms. DFT studies reveal that the highest occupied molecular orbitals (HOMOs) are delocalized along the polymer backbone, whereas the lowest unoccupied molecular orbitals (LUMOs) are predominantly localized on the donor units, hence promoting efficient electron transfer to DCB. These findings elucidate the charge-transfer mechanisms of ATz-based donor–acceptor polymers and underscore their potential for solar applications.

光致电荷转移动力学是评估有机材料是否适合太阳能电池应用的关键。本研究利用飞秒-微秒时间分辨光谱研究了一系列π共轭给体-受体聚合物的激发态动力学，这些聚合物具有强吸电子单元(（E)-1,2-二（噻唑-2-基）二氮烯）（ATZ）和三个不同的给体基团：噻吩[3,2-b]噻吩（TT）， 2,2 ' -二噻吩（BT）和(E)-1,2-二（噻吩-2-基）乙烯（DTV）。通过稳态吸收、荧光、密度泛函理论（DFT）计算和瞬态吸收（TA）光谱来阐明它们在1,4-二氨基苯（DCB）（公认的电子受体）存在下的光物理行为。研究结果表明，分子内电荷从供体片段（TT、BT和DTV）转移到DCB是激发态失活的主要机制。DFT研究表明，最高的已占据分子轨道（HOMOs）沿着聚合物主链离域，而最低的未占据分子轨道（LUMOs）主要定位在给体单元上，从而促进了电子向DCB的有效转移。这些发现阐明了基于atz的供体-受体聚合物的电荷转移机制，并强调了它们在太阳能应用中的潜力。

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引用次数: 0

Iron phthalocyanine nanozyme enhances photodynamic antibacterial activity via enzyme-mimicking catalysis 铁酞菁纳米酶通过酶模拟催化增强光动力抗菌活性

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments

Pub Date : 2025-12-01 DOI: 10.1016/j.dyepig.2025.113476

Ziming Li , Lei Cen , Chenxiang Lin , Yuxiang Chen , Jun-An Xiao , Peiyuan Li , Wei Su

Phototherapy is a promising strategy for treating bacterial infections due to its non-invasive nature and ability to avoid inducing drug resistance. Nevertheless, its full potential is hindered by the pathological microenvironment of infections, such as acidity, high hydrogen peroxide (H₂O₂) concentrations, and hypoxia. Nanozymes are artificial enzymes that exhibit natural enzymatic activity. They can mimic natural enzymes to catalyze the generation of reactive oxygen species (ROS) from oxygen (O₂) or H₂O₂, thereby improving the antibacterial efficacy of photodynamic therapy (PDT). Herein, a near-infrared light responsive nanozyme (FPN@PEG) was synthesized through the self-assembly of 1,8,15,22-tetrakis (N,N-dimethylamino)phthalocyane iron (Fe{Pc[α-N(CH₃)₂]₄}) with amphiphilic 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(polyethylene glycol)-2000 (DSPE-PEG₂₀₀₀) molecules in aqueous solution. FPN@PEG exhibits both catalase (CAT) and peroxidase (POD)-like activities, capable of catalyzing the conversion of H₂O₂ into O₂ and hydroxyl radicals (•OH). Additionally, FPN@PEG can further catalyze the transformation of O₂ into superoxide anions (O₂^•−), demonstrating oxidase (OXD)-like enzymatic activity, thereby enhancing the PDT effect. Furthermore, under 808 nm laser irradiation, FPN@PEG demonstrates excellent photothermal performance, which in turn promotes its nanozymatic catalytic activity. As a result of nanozymatic catalysis and phototherapy, FPN@PEG achieved a 100% inhibition rate against both Staphylococcus aureus (S. aureus) and methicillin-resistant Staphylococcus aureus (MRSA) under 808 nm laser irradiation, demonstrating excellent antimicrobial performance. This work offers valuable reference and inspiration for developing new antibacterial agents that effectively inhibit the activity of drug-resistant bacteria.

光疗由于其非侵入性和避免产生耐药性的能力，是治疗细菌感染的一种很有前途的策略。然而，感染的病理微环境（如酸性、高过氧化氢（H2O2）浓度和缺氧）阻碍了其充分发挥潜力。纳米酶是一种具有天然酶活性的人工酶。它们可以模拟天然酶，催化氧（O2）或H2O2生成活性氧（ROS），从而提高光动力治疗（PDT）的抗菌效果。本文通过1,8,15,22-四（N，N-二甲氨基）酞菁铁（Fe{Pc[α-N(CH3)2]4}）与两亲性的1,2-二硬脂酰-N-甘油-3-磷酸乙醇胺-N-[甲氧基（聚乙二醇）-2000 （DSPE-PEG2000）分子在水溶液中自组装，合成了近红外光响应纳米酶（FPN@PEG）。FPN@PEG具有过氧化氢酶（CAT）和过氧化物酶（POD）样活性，能够催化H2O2转化为O2和羟基自由基（•OH）。此外，FPN@PEG还能进一步催化O2转化为超氧阴离子（O2•−），表现出类似氧化酶（OXD）的酶活性，从而增强PDT效果。此外，在808 nm激光照射下，FPN@PEG表现出优异的光热性能，从而提高了其纳米酶催化活性。通过纳米酶催化和光疗，FPN@PEG在808 nm激光照射下对金黄色葡萄球菌（S. aureus）和耐甲氧西林金黄色葡萄球菌（MRSA）均有100%的抑制率，表现出优异的抗菌性能。本研究为开发有效抑制耐药菌活性的新型抗菌药物提供了有价值的参考和启示。

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引用次数: 0

Mechanistic insights into the thermal ground-state recovery of salicylidene aniline photoswitches 水杨基苯胺光开关热基态恢复的机理研究

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments

Pub Date : 2025-12-01 DOI: 10.1016/j.dyepig.2025.113472

Teodor-Aurelian Cucuiet , Isabella C.D. Merritt , Jean-Luc Pozzo, Frédéric Castet, Dario M. Bassani

Salicylidene aniline (SA) and its derivatives are attractive photochromes for many applications thanks to the environmental sensitivity of their photoswitching. While a large volume of work has been dedicated to understanding the photochemistry of SA, the mechanism by which the trans-keto photoproduct returns to the initial cis-keto form is underexplored in solution. This thermal relaxation has often been previously assumed to proceed via a trans-keto to cis-keto isomerization, as in the solid state. Through a combination of experimental lifetime measurements of such anils with various substituents and theoretical calculations, we show that in solution the thermal recovery is unlikely to occur via direct isomerization of the trans-keto form. Measured lifetimes are on the order of 10⁻⁴–10⁻⁵ s for all SA derivatives and are incompatible with theoretical predictions. We instead propose three alternative recovery mechanisms, involving an initial proton abstraction, addition, or enolization step before isomerization, which are consistent with experimental lifetimes and further supported by a strong primary isotope effect in deuterated ethanol. Overall, thermal relaxation of SA-based photochromes in solution is shown to be dependent on not only molecular substitution, but also environmental factors, making prediction of the lifetime of the photoproduct a complex problem.

水杨基苯胺（SA）及其衍生物由于其光开关的环境敏感性，在许多应用中都是有吸引力的光致变色材料。虽然大量的工作已经致力于了解SA的光化学，但反式酮光产物在溶液中恢复到初始顺式酮形式的机制尚未得到充分探索。这种热弛豫通常被认为是通过反式酮到顺式酮异构化进行的，就像在固态中一样。通过结合各种取代基的实验寿命测量和理论计算，我们表明，在溶液中，通过反式酮形式的直接异构化，热恢复不太可能发生。所有SA衍生物的测量寿命为10−4-10−5 s，与理论预测不相容。我们提出了三种可选的恢复机制，包括异构化前的初始质子提取、加成或烯醇化步骤，这些机制与实验寿命一致，并进一步得到了氘化乙醇中强烈的初级同位素效应的支持。总的来说，sa基光致变色材料在溶液中的热弛豫不仅取决于分子取代，还取决于环境因素，这使得光产物寿命的预测成为一个复杂的问题。

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引用次数: 0

Dye aggregation in solutions and adsorption on A semiconductor surface: A combined molecular dynamics and first principles study 染料在溶液中的聚集和在半导体表面的吸附：分子动力学和第一性原理的结合研究

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments

Pub Date : 2025-12-01 DOI: 10.1016/j.dyepig.2025.113471

Kun Gong , Fang Xu , Zhen Zhao , Ke-Jian Jiang , Wei Li , Dongzhi Liu , Xueqin Zhou

Understanding the microscopic dynamics of dye aggregation in solutions and adsorption on semiconductor surfaces is crucial for controlling material properties and, consequently, the performance of photoelectric devices. This study thoroughly examined the solution aggregation behavior of two triphenylamine dyes, (E)-2-cyano-3-(4-((E)-4-(di-p-tolylamino)styryl)phenyl)acrylic acid (MTPAcc) and (E)-2-cyano-3-(2-((7-((E)-4-(di-p-tolylamino)styryl)-2-methyl-2H-benzo[d][1,2,3]triazol-4-yl)amino)pyrimidin-5-yl)acrylic acid (MTPABT-Pyc), and its impact on the interfacial adsorption on a titanium dioxide (TiO₂) surface using a combination of classical molecular dynamics and first principles methods. MTPAcc molecules form unstable dimers featuring intermolecular hydrogen bonds at the carboxylic acid groups. The dimers easily disintegrate in dichloromethane (DCM) with lifetimes shorter than 500 ps. In ethanol (EtOH), MTPAcc molecules predominantly exist as monomers. These suggests that MTPAcc dyes may adsorb on the TiO₂ surface in their monomeric form. In contrast, the elongated aromatic framework of MTPABT-Pyc promotes π-π stacking, leading to the stable packing dimers. The MTPABT-Pyc molecules stack in the same orientation in DCM and opposite orientation in EtOH. Their structural stability enables dimeric adsorption on the TiO₂ surface. The attachment of the dye molecules along both the latitudinal (X) and longitudinal (Y) directions simultaneously results in a sterically favorable H-aggregation monolayer, derived from the stronger electronic coupling in the Y direction than that in the X direction. The theoretical calculations in this study clearly depict the dynamic aggregation and adsorption process of organic dyes in solutions and on a semiconductor surface, which should generate interest in aggregation and adsorption science.

了解染料在溶液中聚集和在半导体表面上吸附的微观动力学对于控制材料性质以及光电器件的性能至关重要。本研究采用经典分子动力学和第原理相结合的方法，深入研究了两种三苯胺染料(E)-2-氰-3-(4-（E)-4-（二对苯胺）苯基苯基）丙烯酸（MTPAcc）和(E)-2-氰-3-（2-（7-（E)-4-（二对苯胺）苯基）-2-甲基- 2h -苯并[d][1,2,3]三唑-4-基）氨基嘧啶-5-基）丙烯酸（MTPABT-Pyc）的溶液聚集行为及其对二氧化钛（TiO2）表面界面吸附的影响。MTPAcc分子形成不稳定的二聚体，在羧基上具有分子间氢键。二聚体在二氯甲烷（DCM）中容易分解，寿命短于500ps。在乙醇（EtOH）中，MTPAcc分子主要以单体形式存在。这表明MTPAcc染料可能以其单体形式吸附在TiO2表面。相比之下，MTPABT-Pyc的细长芳香骨架促进了π-π的堆积，导致了稳定的堆积二聚体。MTPABT-Pyc分子在DCM中以相同的取向堆叠，在EtOH中以相反的取向堆叠。它们的结构稳定性使得二聚体能够在TiO2表面吸附。染料分子沿纬度(X)和纵向(Y)方向的附着同时形成了一个空间上有利的h聚集单层，这是由于Y方向的电子耦合比X方向的电子耦合更强。本研究的理论计算清楚地描述了有机染料在溶液和半导体表面上的动态聚集和吸附过程，这应该引起人们对聚集和吸附科学的兴趣。

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引用次数: 0

Fluorescence resonance energy transfer induced broadband photoresponse for highly efficient solar-driven photocatalysis 荧光共振能量转移诱导宽带光响应的高效太阳能驱动光催化

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments

Pub Date : 2025-11-30 DOI: 10.1016/j.dyepig.2025.113475

Guotao Xiang , Qinyu Xu , Zhiyu Yang , Yongjie Wang , Lu Yao , Sha Jiang , Xianju Zhou , Li Li , Xiaojun Wang , Jiahua Zhang

Developing efficient photocatalysts with near-infrared (NIR) light responsiveness to enhance solar energy utilization efficiency holds significant scientific importance. In this work, β-NaLuF₄: Yb³⁺/Tm³⁺ upconversion nanoparticles are selected as the NIR light converter and integrated with the non-metallic semiconductor graphitic carbon nitride (g-C₃N₄) to fabricate a photocatalytic material β-NaLuF₄: Yb³⁺/Tm³⁺@SiO₂@g-C₃N₄ (LTSC), which can simultaneously respond to ultraviolet, visible and NIR light. Spectroscopic analysis, including photoluminescence spectra and lifetime decay curves of the samples, reveals a highly efficient fluorescence resonance energy transfer (FRET) mechanism between Tm³⁺: ¹I₆ and ¹D₂ state and g-C₃N₄, which allows g-C₃N₄ to generate photoinduced carriers under NIR light irradiation for photocatalytic reactions. Quantitative evaluation using Rhodamine B as a model pollutant demonstrates that LTSC exhibits exceptional photodegradation efficiency and rate under the solar illumination, outperforming conventional photocatalysts in the corresponding class. Additionally, the photocatalytic mechanism is systematically elucidated through comprehensive photoelectrochemical characterizations. This work not only provides a highly efficient broadband responsive photocatalyst LTSC, but also establishes a rational design strategy for developing such materials.

开发具有近红外响应性的高效光催化剂以提高太阳能利用效率具有重要的科学意义。本研究选择β-NaLuF4: Yb3+/Tm3+上转换纳米粒子作为近红外光转换器，与非金属半导体石墨化碳氮化碳（g-C3N4）集成，制备出可同时响应紫外光、可见光和近红外光的光催化材料β-NaLuF4: Yb3+/Tm3+@SiO2@g-C3N4 （LTSC）。光谱分析，包括样品的光致发光光谱和寿命衰减曲线，揭示了Tm3+: 1I6和1D2态与g-C3N4之间的高效荧光共振能量转移（FRET）机制，使g-C3N4在近红外光照射下产生光诱导载流子进行光催化反应。以罗丹明B为模型污染物的定量评价表明，LTSC在太阳光照下表现出优异的光降解效率和速率，优于同类常规光催化剂。此外，通过全面的光电化学表征，系统地阐明了光催化机理。这项工作不仅提供了一种高效的宽带响应光催化剂LTSC，而且为开发这种材料建立了合理的设计策略。

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引用次数: 0

Highly efficient circularly polarized phosphorescent electroluminescence from rosin-based Ir(III) complexes 松香基Ir（III）配合物的高效圆偏振磷光电致发光

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments

Pub Date : 2025-11-29 DOI: 10.1016/j.dyepig.2025.113474

Wei-Hua Zhang , Xiao-Xia Li , Xin-Chen Wang , Bi-Hai Tong , Yan-Qin Miao , Guo-Dong Li

Chiral iridium(III) complexes have garnered significant attention in the fields of circularly polarized luminescence (CPL) materials and sensors, yet the variety of available chiral ligands remains limited. In this study, we report three novel chiral Ir(III) complexes (i.e., Ir(dba)₂(da3f), Ir(dba)₂(da5f) and Ir(dba)₂(da7f)) with β-diketone ligands derived from naturally chiral pure rosin. The presence of intramolecular hydrogen bonding enhances the rigidity and thermal stability of these complexes. All three complexes exhibited thermal decomposition temperatures (at 5 % weight loss) exceeding 200 °C. The dissymmetry factors (g_PL) of Ir(dba)₂(da5f) and Ir(dba)₂(da7f) were measured as 2.0 × 10⁻³ and 2.9 × 10⁻³, respectively. All complexes demonstrated moderate photoluminescence quantum yields (PLQY) (43.0 %–53.8 %) and short excited-state lifetimes (1.05–1.13 μs). OLED Devices of the three complexes were successfully fabricated through vacuum deposition, with the Ir(dba)₂(da5f)-based device (D2) showing the optimal performance, with maximum current efficiency (CE_max), maximum power efficiency (PE_max), and maximum external quantum efficiency (EQE_max) of 33.2 cd A⁻¹, 27.8 lm W⁻¹, and 13.2 %, respectively. Furthermore, this device demonstrated a strong circularly polarized electroluminescence (CPEL) signal with a dissymmetry factor (g_EL) of 1.40 × 10⁻³. This study demonstrates the feasibility of employing dehydroabietic acid derivatives as chiral ligands in circularly polarized luminescence materials.

手性铱（III）配合物在圆偏振发光（CPL）材料和传感器领域引起了极大的关注，但可用的手性配体的种类仍然有限。在这项研究中，我们报道了三种新的手性Ir（III）配合物(即Ir(dba)2(da3f), Ir(dba)2（da5f）和Ir（dba)2(da7f)）与天然手性纯松香衍生的β-二酮配体。分子内氢键的存在提高了这些配合物的刚性和热稳定性。这三种配合物的热分解温度（失重5%）均超过200℃。测定了Ir(dba)2（da5f）和Ir(dba)2（da7f）的不对称因子（gPL）分别为2.0 × 10−3和2.9 × 10−3。所有配合物均具有中等的光致发光量子产率（PLQY）（43.0% ~ 53.8%）和较短的激发态寿命（1.05 ~ 1.13 μs）。通过真空沉积成功制备了三种配合物的OLED器件，其中基于Ir(dba)2（da5f）的器件（D2）表现出最佳性能，最大电流效率（CEmax）、最大功率效率（PEmax）和最大外量子效率（EQEmax）分别为33.2 cd A−1、27.8 lm W−1和13.2%。此外，该器件显示出强圆极化电致发光（CPEL）信号，其不对称因子（gEL）为1.40 × 10−3。本研究证明了将脱氢枞酸衍生物作为手性配体应用于圆极化发光材料的可行性。

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引用次数: 0

Donor configuration modulation strategy for A-D-π-D-A type red thermally activated delayed fluorescence emitters towards efficient solution-processed OLEDs 针对高效溶液处理oled的A-D-π-D-A型红色热激活延迟荧光发射体的给体构型调制策略

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments

Pub Date : 2025-11-28 DOI: 10.1016/j.dyepig.2025.113469

Shuai Lv , Qiyin Ran , Jun Wu , Hongjin Gao , Guimin Zhao , Yueming Sun , Wei Jiang

Thermally activated delayed fluorescence (TADF) materials can effectively utilize triplet excitons, but the development of red TADF molecules has lagged due to a high nonradiative decay rate governed by the energy gap law and solid-state emission quenching. This study presents a novel A-D-π-D-A-type molecular design strategy, where a phenyl ring serves as the π-bridge and multiple NAI-DMAC units are attached at different positions. Three red emitters, DNAI-pPh, DNAI-mPh, and TNAI-mPh, were synthesized, featuring linear, V-shaped and shamrock-shaped donor architectures, respectively. In the monomolecular state, the emission of DNAI-pPh, DNAI-mPh, and TNAI-mPh gradually blue-shifts (617 nm, 609 nm, and 605 nm) and their nonradiative decay rates decrease progressively (1.61 × 10⁶ s⁻¹, 8.46 × 10⁵ s⁻¹, and 6.46 × 10⁵ s⁻¹), governed by differences in conjugation extent and intramolecular steric hindrance caused by distinct donor configurations. However, in the aggregated state, TNAI-mPh exhibits a pronounced red-shift but suffers from aggregation-induced quenching. In contrast, DNAI-mPh effectively combines high luminescence efficiency with a red-shifted emission wavelength. When doped into a dendritic host material as the emissive layer in solution-processed OLEDs, devices based on DNAI-mPh and TNAI-mPh achieved optimal external quantum efficiencies (EQEs) of 6.4 % and 5.7 %, respectively, along with identical peak electroluminescence at 628 nm at a doping concentration of 10 wt%.

热激活延迟荧光（TADF）材料可以有效地利用三重态激子，但由于受能隙定律和固态发射猝灭控制的高非辐射衰减率，红色TADF分子的发展滞后。本研究提出了一种新的a - d -π- d - a型分子设计策略，以苯基环为π桥，在不同位置连接多个NAI-DMAC单元。合成了3个红色发射体，分别为线性、v形和三叶草形给体结构的DNAI-pPh、DNAI-mPh和TNAI-mPh。在单分子状态下，DNAI-pPh、DNAI-mPh和TNAI-mPh的辐射逐渐蓝移（617 nm、609 nm和605 nm），其非辐射衰减率逐渐降低（1.61 × 106 s−1、8.46 × 105 s−1和6.46 × 105 s−1），这是由不同给体构型引起的共轭程度和分子内位阻的差异所决定的。然而，在聚集状态下，TNAI-mPh表现出明显的红移，但受到聚集诱导的猝灭的影响。相比之下，dna - mph有效地结合了高发光效率和红移发射波长。当掺杂到树枝状主体材料中作为溶液处理oled的发射层时，基于DNAI-mPh和TNAI-mPh的器件分别获得了最佳的外量子效率（EQEs），分别为6.4%和5.7%，并且在掺杂浓度为10 wt%时具有相同的628 nm电致发光峰。

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引用次数: 0

Tri-functional fluorescent probe based on the PET/ICT mechanism for tracing pH, HOCl and polarity 基于PET/ICT机制的三功能荧光探针追踪pH、HOCl和极性

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments

Pub Date : 2025-11-28 DOI: 10.1016/j.dyepig.2025.113470

Feng Li , Qing Mei , Yu-Rong Guo , Rui-Zhen Zhang

In this work, a novel multifunctional probe (FN) was developed by combining phenothiazine derivatives with 4-pyridineacetonitrile for the detection of pH, HOCl and polarity. FN could separately detect three parameters in different channels (red, yellow, blue). FN exhibited polarity sensitivity and showed intense yellow fluorescence in low polarity solvents. As the polarity increased, the fluorescence would shift toward the red (from 576 nm to 637 nm) and weaken. Two pH sensitive sites allowed FN to undergo two successive protonation processes. The probe exhibited red fluorescence in alkaline conditions, while its fluorescence weakened under acidic conditions. Besides, the probe was also selective and sensitive to HOCl fluctuations with good linearity in the range of 5–30 μM and could display blue fluorescence centered at 488 nm through specific oxidation reaction. Therefore, based on different fluorescence changes, FN could achieve separate responses to pH, HOCl and polarity. The probe was used for the detection of pH in actual water samples with satisfactory results. FN was also prepared as test strips for the detection of HOCl, showing a significant color change which was dependent on the concentration of HOCl. Significantly, FN had promising application potential in cells and could be used to detect changes of pH and HOCl.

本文将吩噻嗪衍生物与4-吡啶乙腈结合，制备了一种新型多功能探针（FN），用于检测pH、HOCl和极性。FN可以分别检测红、黄、蓝三个通道的参数。FN具有极性敏感性，在低极性溶剂中表现出强烈的黄色荧光。随着极性的增加，荧光会向红色方向移动（从576 nm到637 nm）并减弱。两个pH敏感位点允许FN经历两个连续的质子化过程。探针在碱性条件下呈现红色荧光，在酸性条件下荧光减弱。在5 ~ 30 μM范围内，探针对HOCl波动具有良好的选择性和敏感性，并能通过特异性氧化反应显示以488 nm为中心的蓝色荧光。因此，根据不同的荧光变化，FN可以分别对pH、HOCl和极性进行响应。该探针用于实际水样pH的检测，结果令人满意。FN也被制备为HOCl检测的试纸条，显示出明显的颜色变化，这取决于HOCl的浓度。值得注意的是，FN在细胞中具有很好的应用潜力，可以用于检测pH和HOCl的变化。

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引用次数: 0