Journal of Luminescence最新文献_第2页

Twist-controlled electronic conjugation in pyrazoloquinoline dyes: Photostable blue emitters with near-unity fluorescence quantum yields 吡唑喹啉染料中的扭控电子偶联：具有接近统一荧光量子产率的光稳定蓝色发射体

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-05 DOI: 10.1016/j.jlumin.2026.121747

Tomasz Uchacz , Paweł Szlachcic , Marcin Andrzejak , Joanna Zams , Piotr Wieczorek , Przemysław Kolek , Katarzyna Stadnicka , Andrzej Danel , Arkadiusz Gut

The design of highly fluorescent chromophores has gained notable interest in recent years. In this work, we synthesized two new dyes based on the 1H-pyrazolo[3,4-b]quinoline scaffold, each bearing a sterically twisted phenyl group at the 1-position of the pyrazole ring. By varying the number of methyl substituents on the phenyl ring (1-(2-methylphenyl) and 1-(2,6-dimethylphenyl)), we were able to tune the torsional angle between the phenyl group and the heterocyclic core. This structural control enabled modulation of key photophysical properties, including fluorescence quantum yield, fluorescence lifetime, emission color, and solvatochromism. The reference compound lacking steric hindrance (1-phenyl-pyrazoloquinoline) displayed polarity-dependent blue-green fluorescence, long fluorescence lifetimes (up to 31 ns), and a large excited-state dipole moment (11.4 D). Increasing steric congestion forced the phenyl ring toward a nearly perpendicular orientation (DFT-predicted torsion ∼80°), reducing electronic coupling with the pyrazole core. This electronic decoupling resulted in highly efficient fluorescence, with quantum yields reaching 100 % and lifetimes of ∼14 ns. Consequently, the emission in polar solvents could be systematically tuned from blue-green to deep blue depending on the number of methyl substituents. The dyes exhibited excellent photostability, with only 1.5 % degradation after 6 h of irradiation at 350 nm, as well as high thermal stability and no tendency to aggregate. Furthermore, the investigated compounds maintained near-unity fluorescence quantum yields even when incorporated into a polymer matrix. These features suggest strong potential for optical applications, particularly as fluorescence quantum yield standards. The experimental observations were supported by quantum-chemical calculations, X-ray crystallography, and cyclic voltammetry measurements.

近年来，高荧光发色团的设计引起了人们的极大兴趣。在这项工作中，我们基于1h -吡唑啉[3,4-b]喹啉支架合成了两种新的染料，每种染料在吡唑环的1位上都有一个立体扭曲的苯基。通过改变苯基环上的甲基取代基（1-（2-甲基苯基）和1-（2,6-二甲基苯基））的数量，我们能够调整苯基和杂环核心之间的扭角。这种结构控制可以调节关键的光物理性质，包括荧光量子产率、荧光寿命、发射颜色和溶剂变色。缺乏位阻的参比化合物（1-苯基吡唑喹啉）显示出极性依赖的蓝绿色荧光，荧光寿命长（高达31 ns），激发态偶极矩大（11.4 D）。空间拥塞的增加迫使苯基环朝向几乎垂直的方向（dft预测的扭转~ 80°），减少了与吡唑核心的电子耦合。这种电子去耦导致了高效荧光，量子产率达到100%，寿命为~ 14 ns。因此，极性溶剂中的发射可以根据甲基取代基的数量系统地从蓝绿色调谐到深蓝色。该染料表现出优异的光稳定性，在350 nm照射6 h后降解率仅为1.5%，具有较高的热稳定性和无聚集倾向。此外，所研究的化合物保持接近统一的荧光量子产率，即使合并到聚合物基质中。这些特征表明光学应用的巨大潜力，特别是作为荧光量子产率标准。实验观察得到了量子化学计算、x射线晶体学和循环伏安法测量的支持。

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引用次数: 0

Highly twisted dual state emissive imidazole donor-acceptor fluorophore: Reversible halofluorochromism and structure controlled photostability 高度扭曲双态发射咪唑给受体荧光团：可逆的氟化荧光和结构控制的光稳定性

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-04 DOI: 10.1016/j.jlumin.2026.121746

R. Rameshbabu Priyadharsan , Sasikala Ravi , Elakkiya Sivakumar , Subramanian Karthikeyan , Mehboobali Pannipara , Abdullah G. Al-Sehemi , Dohyun Moon , Savarimuthu Philip Anthony

Dual state emissive imidazole derivatives, 4-(4,5-diphenyl-1H-imidazole-2-yl)-3,5-dimethoxy-N,N-diphenylaniline (Imi-B) and 3,5-dimethoxy-4-(1H-phenanthro[9,10-d]imidazole-2-yl)-N,N-diphenylaniline (Imi-P) were synthesized and investigated their photophysical and stimuli-responsive properties in solution as well as solid-state. Single crystal structural studies revealed highly twisted molecular conformation between triphenylamine phenyl and imidazole due to the presence of methoxy substituents. Imi-B and Imi-P showed strong solid-state fluorescence (quantum yield (ϕ_f) = 22.03 and 12.4 %) at 435 and 456 nm, respectively. Both Imi-B and Imi-P also displayed strong fluorescence in solvents with different polarity (ϕ_f = 0.07 to 0.53 compared to quinine sulphate standard). The presence of acid-responsive nitrogen functionality was utilized to demonstrate pH dependent reversible fluorescence switching in solution as well as solid-state. In solids, Imi-B showed red shifting of fluorescence with strong reduction of intensity whereas Imi-P displayed only red shifting of emission upon trifluoroacetic acid (TFA) exposure. In contrast, both molecules showed significant reduction of intensity with red shifting of emission in solution by TFA exposure. The fluorescence was perfectly reversed to initial state by NH₃ exposure in solution compared to the solid-state. The photostability studies revealed strong reduction of fluorescence intensity and appearance of new absorption for Imi-B. But Imi-P displayed good stability and did not show significant change over 80 min UV exposure. Thus, the conformation of integrating phenyl substituents in the imidazole units significantly influenced on the photostability of imidazole derivatives.

合成了咪唑双态发射衍生物4-（4,5-二苯基- 1h -咪唑-2-基）-3,5-二甲氧基- n， n -二苯基苯胺（Imi-B）和3,5-二甲氧基-4-（1h -菲唑[9,10-d]咪唑-2-基）- n， n -二苯基苯胺（Imi-P），并研究了它们在溶液和固态中的光物理和刺激响应性能。单晶结构研究表明，由于甲氧基取代基的存在，三苯胺苯基和咪唑之间存在高度扭曲的分子构象。在435 nm和456nm处，Imi-B和Imi-P表现出较强的固态荧光（量子产率（ϕf）分别为22.03和12.4%）。Imi-B和Imi-P在不同极性的溶剂中也显示出很强的荧光（与硫酸奎宁标准相比，ϕ = 0.07 ~ 0.53）。利用酸响应氮功能的存在来证明溶液和固态中pH依赖的可逆荧光开关。在固体中，Imi-B在三氟乙酸（TFA）暴露下表现出荧光红移和强度的强烈降低，而Imi-P仅表现出发射红移。相比之下，这两种分子暴露在TFA溶液中都表现出明显的强度降低和发射红移。与固态相比，NH3暴露在溶液中的荧光完全逆转到初始状态。光稳定性研究表明，Imi-B的荧光强度明显降低，并出现新的吸收。但Imi-P表现出良好的稳定性，在紫外线照射80分钟后没有明显变化。因此，在咪唑基上整合苯基取代基的构象对咪唑衍生物的光稳定性有显著影响。

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引用次数: 0

Multimodal and color-tunable luminescence in CaZnOS:Eu3+,Pr3+ phosphors CaZnOS:Eu3+，Pr3+荧光粉的多模态和颜色可调发光

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-04 DOI: 10.1016/j.jlumin.2026.121745

Sarfraz Ahmad , Shulong Chang , Fuhang Jiao , Yuan Deng , Xiang Li , Junlu Sun , Ying Xiao , Lin Dong

With the growing demands for multilayered security and advanced anti-counterfeiting technologies, luminescent materials capable of multimodal excitation and color tuning are increasingly vital. Here, we report the solid-state synthesis of CaZnOS-based phosphors co-doped with Eu³⁺ and Pr³⁺, enabling excitation- and stress-dependent emission across a broad chromatic range. Systematic variation of Pr³⁺ concentration, with Eu³⁺ fixed at 1.5 %, revealed broad photoluminescence spanning red to bluish-green under UV excitation (290–490 nm) and mechanoluminescence with force-induced color evolution from red to green. Temperature-dependent PL further demonstrated clear thermochromic responses, particular in CaZnOS:1.5 %Eu³⁺,1 %Pr³⁺. Practical demonstrations in color-tunable handwriting and anticounterfeiting labels underscore the versatility of these phosphors in secure and interactive optical applications. The combination of remarkable color-tuning capability, robust mechanoluminescent performance, and thermal stability positions CaZnOS:Eu³⁺,Pr³⁺ as an ideal platform for next-generation e-signatures, security features, and integrated optoelectronic devices.

随着人们对多层安全性和先进防伪技术的需求日益增长，具有多模态激发和颜色调谐功能的发光材料变得越来越重要。在这里，我们报道了与Eu3+和Pr3+共掺杂的caznos基荧光粉的固态合成，使激发和应力依赖的发光在宽的色范围内。Pr3+浓度系统变化时，Eu3+固定在1.5%，在紫外激发下（290-490 nm）显示出从红色到蓝绿色的广泛光致发光，并在力诱导下从红色到绿色演变为机械发光。温度依赖性PL进一步表现出明显的热致变色反应，特别是在CaZnOS: 1.5% Eu3+， 1% Pr3+中。可调色手写和防伪标签的实际演示强调了这些荧光粉在安全和交互式光学应用中的多功能性。卓越的调色能力、强大的机械发光性能和热稳定性使CaZnOS:Eu3+、Pr3+成为下一代电子签名、安全功能和集成光电器件的理想平台。

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引用次数: 0

Electrostatic self-assembled rhodamine B functionalized terbium-based MOFs for highly sensitive detection of sulfide ions 静电自组装罗丹明B功能化铽基mof用于高灵敏度检测硫化物离子

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-03 DOI: 10.1016/j.jlumin.2026.121736

Yuhong Xie , Yiying Wang , Yourong Zhao , Jiali Yang , Yangchun Fan , Hongda Li , Daojiang Gao , Zhanglei Ning

In this study, a dual-emission ratiometric fluorescent materials, rhodamine B-functionalized terbium-based metal-organic frameworks (RhB@Tb-MOFs), were synthesized through an ultrasonic immersion approach. The resulting RhB@Tb-MOFs demonstrate a distinct red-green dual emission, generating an easily distinguishable orange-red luminescence with excellent stability across a wide pH range and aqueous environments. This novel probe demonstrates excellent selectivity along with outstanding anti-interference capability, achieving a detection limit as low as 0.219 μM for S²⁻. Moreover, the sensing mechanism was studied in detail, which is attributed to a dynamic quenching mechanism. This study highlights a versatile and generalizable approach for enhancing luminescence-based sensing performance through the encapsulation of fluorescent dyes in Ln-MOFs, presenting significant potential for environmental monitoring and bioanalytical applications.

本研究采用超声浸没法合成了一种双发射比荧光材料罗丹明b功能化铽基金属有机骨架（RhB@Tb-MOFs）。由此产生的RhB@Tb-MOFs显示出明显的红绿双发射，产生易于区分的橙红色发光，在宽pH范围和水环境中具有优异的稳定性。该探针具有优异的选择性和抗干扰能力，对S2−的检测限低至0.219 μM。并对其传感机理进行了详细研究，认为其是一种动态猝灭机制。这项研究强调了一种通用的方法，通过在ln - mof中封装荧光染料来增强基于发光的传感性能，在环境监测和生物分析应用中具有重要的潜力。

引用次数: 0

Organic-inorganic hybrid perovskite as a self-sacrificing template towards high-quality Cs4PbBr6 green emitters 有机-无机杂化钙钛矿作为自我牺牲模板制备高质量的Cs4PbBr6绿色发光体

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-03 DOI: 10.1016/j.jlumin.2026.121734

Siyuan Fu , Hong Ming , Haorui Zhu , Kaiyu Huang , Hanqi Yao , Zhen Chen , Xiaofeng Liu , Huidan Zeng

Driven by the urgent need for narrow-band green emitters to address the color gamut deficiency in current white light-emitting diodes (WLEDs), in this work we develop a novel precursor-mediated strategy for the controlled synthesis of high-efficiency Cs₄PbBr₆ perovskite crystals. Unlike conventional methods that often yield mixed phases, we utilize a judiciously designed organic-inorganic hybrid perovskite crystal, (HDA)Cs₂Pb₃Br₁₀ (HDA = 1,6-hexanediamine), as a self-sacrificing template for the synthsis of high purity Cs₄PbBr₆ crystals. By precisely adjusting the solvent composition (HBr/DMF(N,N-Dimethylformamide) ratio) during the dissolution-recrystallization process, selective and controllable phase conversion of the hybrid perovskite to Cs₄PbBr₆ or CsPbBr₃ was achieved. Specifically, the resulting high-quality Cs₄PbBr₆ crystals exhibit a high photoluminescence quantum yield (PLQY) of up to 94 %. The phase transition mechanism systematically investigated through combined spectroscopic methods unravels that the transformation into all-inorganic perovskites benefits from the stripping of the HDA²⁺ organic interlayer by the DMF solvent, while the formation of high-quality Cs₄PbBr₆ crystals is attributed to the Pb-deficient environment provided by HBr and DMABr (Dimethylammonium bromide). Furthermore, a prototype WLED device fabricated with the obtained Cs₄PbBr₆ crystals and commercial K₂SiF₆:Mn⁴⁺ phosphor demonstrated a high luminous efficiency of 98.04 lm/W and an extensive color gamut covering 136 % of National Television System Committee (NTSC) and 101.6 % of Rec.2020 (derived from the photoluminescence spectra after passing RGB optical filters). These results highlight the potential of the Cs₄PbBr₆ crystals for application in advanced wide-color-gamut displays.

为解决当前白光二极管（wled）色域不足的迫切需要，我们开发了一种新的前驱体介导策略，用于控制合成高效的Cs4PbBr6钙钛矿晶体。不同于传统的方法通常会产生混合相，我们利用一种精心设计的有机-无机杂化钙钛矿晶体（HDA）Cs2Pb3Br10 （HDA = 1,6-己二胺）作为自我牺牲模板来合成高纯度的Cs4PbBr6晶体。通过在溶解-重结晶过程中精确调节溶剂组成（HBr/DMF（N，N-二甲基甲酰胺）比），实现了杂化钙钛矿向Cs4PbBr6或CsPbBr3的选择性可控相变。具体来说，得到的高质量Cs4PbBr6晶体具有高达94%的光致发光量子产率（PLQY）。通过组合光谱方法系统研究了钙钛矿的相变机理，揭示了钙钛矿向全无机钙钛矿的转变得益于DMF溶剂对HDA2+有机中间层的剥离，而高质量Cs4PbBr6晶体的形成归因于HBr和DMABr（二甲基溴化铵）提供的缺铅环境。此外，用获得的Cs4PbBr6晶体和商用K2SiF6:Mn4+荧光粉制作的WLED原型器件显示出98.04 lm/W的高发光效率和广泛的色域，覆盖了国家电视系统委员会（NTSC）的136%和Rec.2020的101.6%（通过RGB滤光片后的光致发光光谱）。这些结果突出了Cs4PbBr6晶体在先进的宽色域显示器中的应用潜力。

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引用次数: 0

Photo- and X-ray excited luminescence, thermoluminescence and scintillation characteristics of LuGd2Al3Ga2O12:Ce,Mo single crystal scintillators: Influence of Mo co-doping LuGd2Al3Ga2O12:Ce，Mo单晶闪烁体的光激发发光、热发光和闪烁特性：Mo共掺杂的影响

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2026-01-03 DOI: 10.1016/j.jlumin.2026.121737

Warut Chewpraditkul , Nakarin Pattanaboonmee , Weerapong Chewpraditkul , Ongsa Sakthong , Masao Yoshino , Takahiko Horiai , Shunsuke Kurosawa , Kei Kamada , Romana Kucerkova , Alena Beitlerova , Tingsong Li , Yanbin Wang , Chen Hu , Jiang Li , Vlademir Babin , Martin Nikl , Akira Yoshikawa

Mo co-doped LuGd₂Al₃Ga₂O₁₂:Ce,Mo (Mo = 0, 300, 600 ppm) single crystals were grown by the micro-pulling-down method. The optical absorption and X-ray excited luminescence spectra, temperature dependence of photoluminescence decay kinetics, afterglow and thermoluminescence (TL) intensity, and scintillation properties (light yield, LY, and decay time) were investigated. The quenching temperature of 355 K was determined from temperature-dependent photoluminescence decay kinetics in the temperature range of 77–487 K under excitation in the 4f - 5d₁ absorption band of the Ce³⁺ ions. Under excitation of 662 keV γ rays, the LuGd₂Al₃Ga₂O₁₂:Ce,Mo600 sample showed high LY value of 32,900 photons/MeV, energy resolution of 7.6 %, and scintillation decay time of 119 ns (38 %) + 475 ns (62 %). The lower LY value together with higher contribution of slower scintillation decay component among the samples studied was observed for LuGd₂Al₃Ga₂O₁₂:Ce,Mo300 sample, consistently with its higher afterglow intensity and longer de-trapping time of the dominant TL glow peak at 356 K.

采用微拉下法制备了Mo共掺杂LuGd2Al3Ga2O12:Ce，Mo （Mo = 0,300, 600 ppm）单晶。研究了光吸收和x射线激发发光光谱、光致发光衰变动力学、余辉和热致发光（TL）强度以及闪烁特性（产光量、LY和衰变时间）的温度依赖性。在Ce3+离子的4f - 5d1吸收带激发下，在77 ~ 487 K的温度范围内，根据温度依赖的光致发光衰变动力学确定了355 K的猝灭温度。在662 keV γ射线激发下，LuGd2Al3Ga2O12:Ce，Mo600样品的LY值高达32900光子/MeV，能量分辨率为7.6%，闪烁衰减时间为119 ns (38%) + 475 ns（62%）。LuGd2Al3Ga2O12:Ce，Mo300样品具有较低的LY值和较慢的闪烁衰减分量的较高贡献，且在356k时具有较高的余辉强度和较长的脱捕获时间。

{"title":"Photo- and X-ray excited luminescence, thermoluminescence and scintillation characteristics of LuGd2Al3Ga2O12:Ce,Mo single crystal scintillators: Influence of Mo co-doping","authors":"Warut Chewpraditkul , Nakarin Pattanaboonmee , Weerapong Chewpraditkul , Ongsa Sakthong , Masao Yoshino , Takahiko Horiai , Shunsuke Kurosawa , Kei Kamada , Romana Kucerkova , Alena Beitlerova , Tingsong Li , Yanbin Wang , Chen Hu , Jiang Li , Vlademir Babin , Martin Nikl , Akira Yoshikawa","doi":"10.1016/j.jlumin.2026.121737","DOIUrl":"10.1016/j.jlumin.2026.121737","url":null,"abstract":"<div><div>Mo co-doped LuGd<sub>2</sub>Al<sub>3</sub>Ga<sub>2</sub>O<sub>12</sub>:Ce,Mo (Mo = 0, 300, 600 ppm) single crystals were grown by the micro-pulling-down method. The optical absorption and X-ray excited luminescence spectra, temperature dependence of photoluminescence decay kinetics, afterglow and thermoluminescence (TL) intensity, and scintillation properties (light yield, LY, and decay time) were investigated. The quenching temperature of 355 K was determined from temperature-dependent photoluminescence decay kinetics in the temperature range of 77–487 K under excitation in the 4f - 5d<sub>1</sub> absorption band of the Ce<sup>3+</sup> ions. Under excitation of 662 keV <em>γ</em> rays, the LuGd<sub>2</sub>Al<sub>3</sub>Ga<sub>2</sub>O<sub>12</sub>:Ce,Mo600 sample showed high LY value of 32,900 photons/MeV, energy resolution of 7.6 %, and scintillation decay time of 119 ns (38 %) + 475 ns (62 %). The lower LY value together with higher contribution of slower scintillation decay component among the samples studied was observed for LuGd<sub>2</sub>Al<sub>3</sub>Ga<sub>2</sub>O<sub>12</sub>:Ce,Mo300 sample, consistently with its higher afterglow intensity and longer de-trapping time of the dominant TL glow peak at 356 K.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121737"},"PeriodicalIF":3.6,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

引用次数: 0

Fluorescence thermometry utilizing ambient light via energy transfer progression 荧光测温利用环境光通过能量转移过程

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2025-12-31 DOI: 10.1016/j.jlumin.2025.121732

Shuai He , Shuang Zheng , Yubo Lin , Liangliang Zhang , Xuanli Wang , Xiaobo Yu , Qian Guan , Luomeng Chao , Jun Qiao , Yonghong Ma

Optical thermometry based on temperature-dependent luminescent parameters, such as the luminescent intensity ratio (LIR), offers non-contact operation and high resolution but often requires complex excitation systems. This study presents a broadband near-infrared (NIR)-emitting phosphor, Gd_2.4Lu_0.6Ga₄AlO₁₂ (GLGA): Cr³⁺, xYb³⁺, which can be directly excited by ambient light, thereby significantly simplifying the measurement setup by eliminating the need for an external light source. The material exhibits an emission spectrum covering 650–1050 nm and demonstrates remarkable temperature-dependent characteristics over the 303–483 K range. By leveraging energy transfer between Cr³⁺ and Yb³⁺ and their distinct thermal quenching behaviors, the LIR of Yb³⁺ to Cr³⁺ emission is established as a reliable temperature probe. A maximum relative sensitivity of 0.5 % K⁻¹ is achieved at 423 K for the sample with x = 0.20. Practical applicability is verified using phosphor-embedded silicone elastomers, which enable accurate temperature sensing under various ambient light conditions (sunlight, cloudy day, and indoor lighting). This work confirms the great potential of visible-light-excited NIR-emitting materials in ambient-light-activated fluorescence thermometry.

光学测温基于温度相关的发光参数，如发光强度比（LIR），提供非接触操作和高分辨率，但往往需要复杂的激发系统。本研究提出了一种宽带近红外（NIR）发光荧光粉Gd2.4Lu0.6Ga4AlO12 (GLGA): Cr3+, xYb3+，它可以被环境光直接激发，从而大大简化了测量设置，无需外部光源。该材料的发射光谱覆盖650-1050 nm，在303-483 K范围内具有显著的温度依赖性。利用Cr3+和Yb3+之间的能量传递及其不同的热猝灭行为，建立了Yb3+对Cr3+发射的LIR作为可靠的温度探头。在423 K时，对于x = 0.20的样品，最大相对灵敏度为0.5% K−1。使用嵌入磷的有机硅弹性体验证了实用性，该弹性体可以在各种环境光条件下（阳光，阴天和室内照明）实现精确的温度传感。这项工作证实了可见光激发nir发射材料在环境光激活荧光测温中的巨大潜力。

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引用次数: 0

583 nm laser using Dy-doped silica fibre: Study of fibre fabrication, absorption and emission spectra, yellow laser, photodarkening and related spectral changes 583 nm掺镝二氧化硅光纤激光器：光纤制备、吸收和发射光谱、黄色激光、光变暗及相关光谱变化的研究

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2025-12-31 DOI: 10.1016/j.jlumin.2025.121733

Arindam Halder

We present a cladding-pumped (at 445 nm) Dysprosium (Dy)-doped germano-alumino-silicate fibre (DGAF) laser operating at 583 nm, producing 148 mW of output power with 3.24 % slope efficiency. The DGAFs with 125 μm cladding, 8–10 μm core, and ∼0.13 NA were fabricated in-house using modified chemical vapour deposition process with solution doping technique (MCVD-SD). The fabrication steps, Dy³⁺ absorption and emission spectra, emission lime times; laser cavity design, laser performances, and photodarkening effect (PD) for DGAFs were discussed. The impact of PD on the 583 nm laser output, laser threshold and efficiency were studied. The influence of different glass modifiers like as magnesium (Mg), yttrium (Y), cerium (Ce), on the PD behavior of the 583 nm laser in DGAFs was investigated. A significant change in background attenuation at 630 nm was observed between pristine and post-PD conditions, ranging from below 50 dB/km to above 100 dB/km. This change was attributed to PD which is believed to be the primary factor affecting the generation a good-quality yellow laser using Dy doped silica fibre. This research will be beneficial for the development of future yellow lasers using Dy-doped silica fibre.

我们提出了一种包层泵浦（445 nm）掺镝（Dy）的锗铝硅酸纤维（DGAF）激光器，其工作波长为583 nm，输出功率为148 mW，斜率效率为3.24%。采用改进的化学气相沉积工艺和溶液掺杂技术（MCVD-SD）制备了包层厚度为125 μm、芯层厚度为8-10 μm、NA为0.13的DGAFs。制备步骤，Dy3+吸收和发射光谱，发射石灰次数；讨论了DGAFs的激光腔设计、激光性能和光变暗效应。研究了PD对583nm激光输出、激光阈值和效率的影响。研究了镁（Mg）、钇(Y)、铈（Ce）等不同玻璃改性剂对583nm激光在DGAFs中PD行为的影响。在原始和pd后条件下，在630 nm处观察到显著的背景衰减变化，范围从低于50 dB/km到高于100 dB/km。这种变化归因于PD， PD被认为是影响使用Dy掺杂硅纤维产生高质量黄色激光器的主要因素。这一研究成果将有助于未来掺镝硅纤维黄色激光器的发展。

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引用次数: 0

Eco-friendly carbon dots synthesized from galgal juice for ultraviolet detection 用海藻汁合成的环保碳点，用于紫外线检测

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2025-12-30 DOI: 10.1016/j.jlumin.2025.121730

Srijan Pushkarna , Jyoti Prakash , Kapil Sood , Praveen Malik , Mamta Shandilya , Shivani Dhall

The synthesis of carbon dots via a green route using natural precursor exhibits unique properties, making them a promising candidate for various applications. In this work, we utilized hill galgal juice for synthesizing carbon dots using a cost-effective one-step hydrothermal-assisted green method. We examined the crystal phase and optical properties of the synthesized sample using various techniques, including X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), Raman spectroscopy, UV–Vis spectroscopy, and photoluminescence spectroscopy. The resulting carbon dots exhibited an increased interlayer spacing of about 4.02 Å and a wide optical bandgap of ∼3.2 eV, which can be attributed to the oxygen-containing groups bonded to their surfaces. Interestingly, it was found that when subjected to ultraviolet light, the carbon dots exhibited strong, bright bluish-green fluorescence and exhibited high photoluminescence. Additionally, we fabricated an ultraviolet sensor at room temperature using the as-synthesized sample, achieving a sensing response of 9 % without employing any complex steps. Moreover, the quantum yield of synthesized carbon dots was found to be 22 %.

利用天然前驱体通过绿色途径合成碳点具有独特的性能，使其成为各种应用的有前途的候选者。在这项工作中，我们利用山藻汁合成碳点，采用成本效益高的一步水热辅助绿色方法。我们使用各种技术，包括x射线衍射（XRD）、场发射扫描电镜（FE-SEM）、拉曼光谱、紫外-可见光谱和光致发光光谱，检测了合成样品的晶体相位和光学性质。所得到的碳点显示出增加的层间距约为4.02 Å和宽的光学带隙约为3.2 eV，这可归因于其表面结合的含氧基团。有趣的是，当受到紫外光照射时，碳点表现出强烈的、明亮的蓝绿色荧光，并表现出高的光致发光。此外，我们利用合成的样品在室温下制作了一个紫外传感器，在不采用任何复杂步骤的情况下实现了9%的传感响应。此外，合成的碳点的量子产率为22%。

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引用次数: 0

Optical-based sensors for monitoring of brain chemistry biomarkers 用于监测脑化学生物标志物的光学传感器

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence

Pub Date : 2025-12-30 DOI: 10.1016/j.jlumin.2025.121731

Chou-Yi Hsu , Ghaleb A. Oriquat , Rekha M M , Subhashree Ray , Jayshree Nellore , Vimal Arora , Ibrahim K. Alsulami , Zaid H. Mahmoud

Brain chemistry, also known as neurochemistry, refers to the study of the chemical substances and processes within the nervous system, particularly the brain, that influence its function and behavior. These chemicals, including neurotransmitters (NTs) and neuromodulators, play a vital role in communication between neurons and ultimately control everything from movement and thought to emotions and bodily functions. Understanding the specific functions of chemical messengers in brain communication requires highly precise tools capable of measuring the concentration and release patterns of neurotransmitters and neuromodulators. Optical (bio)sensors are emerging as powerful tools for monitoring brain chemistry with high spatial and temporal resolution, offering unprecedented insights into brain function and disease. Here we present a comprehensive review of nano optical biosensors that can be helpful for brain neurochemical monitoring through sensitive detection of NTs and neuromodulators.

脑化学，也被称为神经化学，是指研究神经系统，特别是大脑中影响其功能和行为的化学物质和过程。这些化学物质，包括神经递质（nt）和神经调节剂，在神经元之间的交流中起着至关重要的作用，并最终控制从运动、思想到情绪和身体功能的一切。理解化学信使在大脑交流中的特定功能需要高度精确的工具，能够测量神经递质和神经调节剂的浓度和释放模式。光学（生物）传感器正在成为监测大脑化学的强大工具，具有高空间和时间分辨率，为大脑功能和疾病提供前所未有的见解。在这里，我们介绍了纳米光学生物传感器，可以帮助脑神经化学监测，通过灵敏的检测NTs和神经调节剂。

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