Optical Materials最新文献

{"title":"Unravelling the influence of Ag{111} nanoprism on the redox characteristics of Fe2O3 for efficient photocatalytic degradation","authors":"Mahalakshmi Ramar ,&nbsp;S. Gunasekaran ,&nbsp;Mohd Shkir ,&nbsp;Anjali Sharma ,&nbsp;Balasubramanian Karthikeyan","doi":"10.1016/j.optmat.2025.117099","DOIUrl":"10.1016/j.optmat.2025.117099","url":null,"abstract":"<div><div>Incorporating noble metal nanostructures onto metal oxides surface can significantly improve the photocatalytic performance towards dye degradation. Hematite (α-Fe₂O₃) is considered as a potential candidate for photocatalytic applications due to its unique optoelectronic properties. However, improving the light absorption co-efficient and the excitonic carrier lifetime in Fe₂O₃ is highly required which can be achieved through the incorporation of noble metals. Hence, in this work, different silver (Ag) nanostructures such as Ag nanospheres and Ag {111} nanoprisms are incorporated on Fe₂O₃ surface, thereby enhancing the absorption co-efficient of Fe₂O₃ through localized surface plasmon resonance (LSPR) of Ag nanostructures. Initially, a solid-state sintering technique was employed to prepare pure Fe₂O₃, then Ag nanostructures has been incorporated by constant stirring of Fe₂O₃ and Ag nanostructures in aqueous solution. The structural, morphological and vibration properties were studied by XRD, FESEM, HRTEM, XPS, and Raman analysis respectively. UV–Visible spectral analysis revealed that the optical bandgap energy of Fe₂O₃ gets decreased from 1.93 eV to 1.81 eV upon Ag nanostructures incorporation. Further, time-resolved photoluminescence measurements demonstrated an improved carrier lifetime in Ag{111}/Fe₂O₃ (2.67 ns) compared to Ag nanospheres/Fe₂O₃ (2.5 ns) and pure Fe₂O₃ (1.05 ns). Photocatalytic performance of the prepared samples were evaluated by the degradation of aqueous Rhodamine-6G dye, and the results showed a significant improvement in degradation efficiency, with a maximum photocatalytic efficiency of 87.47 % and a rate constant of 0.0482 min⁻¹. The result implies that the optoelectronic properties of Ag NSs plays a crucial role on the redox reactions involved in the photocatalytic dye degradation.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117099"},"PeriodicalIF":3.8,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143913138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selective Fe3+ sensing probes with transport-Mimetic behaviour: DFT studies and molecular docking insights into transferrin receptor interactions","authors":"Bi Bi Ayisha Mulla ,&nbsp;Aravind R. Nesaragi ,&nbsp;Sharankumar T M ,&nbsp;Ravindra R. Kamble ,&nbsp;Ashok H. Sidarai","doi":"10.1016/j.optmat.2025.117111","DOIUrl":"10.1016/j.optmat.2025.117111","url":null,"abstract":"<div><div>In this study, we present the design, synthesis, and characterization of two coumarin-based fluorescent chemosensors, C1 (4-((4-((Benzo[<em>d</em>]oxazol-2-ylthio)methyl)1H-1,2,3-triazol-1-yl)methyl)-7-methoxy-2H-chromen-2-one) and C2 (4-((4-((Benzo[<em>d</em>]oxazol-2-ylthio)methyl)-1H-1,2,3-triazol-1-yl)methyl)-6-(<em>tert</em>-butyl)-2H-chromen-2-one), synthesized via click chemistry. The absorptive and emissive properties of probes were investigated with various metal ions, revealing an excellent luminescent sensing response to key micronutrients, specifically Fe³⁺ ions. Thermodynamic fluorescence studies demonstrated that the quenching of the probes by Fe³⁺ is dynamic, involving photo-induced electron transfer (PET) that reduces fluorescence intensity. The detection limit for Fe³⁺ was determined to be 1.88 μM for C1 and 2.06 μM for C2, indicating high sensitivity. Binding sites and interactions between the probes and metal ions were elucidated through density functional theory (DFT) calculations, supported by Fourier transmission infrared (FT-IR) and mass spectrometry. Additionally, molecular docking studies were performed with the human transferrin receptor, demonstrating strong binding affinities of −10.2 kcal/mol for C1 and -9.6 kcal/mol for C2 with key amino acid residues, suggesting their potential role as Fe³⁺ transporters, which may be useful in managing transferrin imbalances and related disorders. These findings highlight the potential of C1 and C2 as effective sensors for Fe³⁺ ions, with promising applications in biomedicine and molecular diagnostics.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117111"},"PeriodicalIF":3.8,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Defect states assisted optical nonlinearity of metal nanoparticle incorporated 2D graphene-MoS2 nanocomposites for engineered photonic device applications","authors":"M. Abith,&nbsp;T.C. Sabari Girisun","doi":"10.1016/j.optmat.2025.117104","DOIUrl":"10.1016/j.optmat.2025.117104","url":null,"abstract":"<div><div>Advanced nonlinear materials are engineered with tailored structural, physical and chemical properties to address modern technological demands exhibiting multifunctional potentiality. Here the synergistic behaviour of copper nanoparticles decorated reduced graphene oxide-Molybdenum disulfide (Cu@rGO-MoS₂) hybrid was assessed to estimate the influence of defect states on the nonlinear optical absorption behaviour under intense nanosecond laser excitation. Cu@rGO-MoS₂ hybrids, prepared by hydrothermal synthesis with different concentration of Cu was preliminarily characterized by X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy analysis. The rGO layer stacking upon MoS₂ nanosheets with hexagonal structure, chemical states of all the counterparts, few layer MoS₂ in the hybrid, successful reduction of graphene oxide and fingerprint vibrational bands were confirmed. The scanning electron microscopy images showcased MoS₂ as spherical structure and rGO as layers with Cu initially as dots grow and form wires/rods of varying length and width with increasing Cu concentration in the hybrids. Altogether, the preliminary characteristics probed the presence of enhanced defect states in all the hybrids. The availability of complex sub bandgap states for new pathways in the electronic transition were confirmed using linear ground state absorption analysis. The nonlinear absorption studies were carried out by performing open aperture Z-scan analysis using a Q-switched Nd:YAG laser (532 nm, 10 Hz and 9 ns). All the open aperture Z-scan pattern depicted reverse saturable absorption (RSA) behaviour at all the input on-axis intensities. The RSA was attributed to the sequential two photon absorption mechanism which was underpinned by the intensity dependent Z-scan studies. The carrier dynamics, field enhancements effects, large active surface region, broad light absorption and induced more defects with inclusion of Cu nanoparticles has effectively influenced the nonlinear optical absorption behaviour by tuning the electronic structure making provisions for utilizing the Cu@rGO-MoS₂ hybrid as an efficient optical limiter for laser safety.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117104"},"PeriodicalIF":3.8,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly efficient Eu3+→Tb3+ energy transfer and colour tunable Y4Al2O9: Eu3+, Tb3+ nanophosphors: A promising material for concealed fingerprint analysis and solid-state lighting","authors":"R. Arunakumar ,&nbsp;B.R. Radha Krushna ,&nbsp;I.S. Pruthviraj ,&nbsp;S.C. Sharma ,&nbsp;Liza Mohapatra ,&nbsp;K. Akila ,&nbsp;R. Anitha ,&nbsp;K. Manjunatha ,&nbsp;Sheng Yun Wu ,&nbsp;B. Bommalingaiah ,&nbsp;T.B. Nijalingappa ,&nbsp;G. Ramakrishna ,&nbsp;H. Nagabhushana","doi":"10.1016/j.optmat.2025.117090","DOIUrl":"10.1016/j.optmat.2025.117090","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Color-tunable Y&lt;sub&gt;4&lt;/sub&gt;Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;9&lt;/sub&gt;: Eu&lt;sup&gt;3+&lt;/sup&gt;, Tb&lt;sup&gt;3+&lt;/sup&gt; (YAM: Eu&lt;sup&gt;3+&lt;/sup&gt;, Tb&lt;sup&gt;3+&lt;/sup&gt;) nanophosphors (NPs) are synthesized using a solution combustion approach using &lt;em&gt;Moringa Oleifera&lt;/em&gt; (&lt;em&gt;M.O.&lt;/em&gt;) leaves extract as fuel. These NPs are extensively characterized through X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). A comprehensive investigation is conducted on their luminescent properties, concentration quenching mechanism, energy transfer (ET) dynamics, luminescence kinetics, thermal stability, and potential applications. Under near-ultraviolet (n-UV) excitation at 365 nm, YAM: 5 %Eu&lt;sup&gt;3+&lt;/sup&gt;, 2 %Tb&lt;sup&gt;3+&lt;/sup&gt; NPs exhibited bright green fluorescence at 543 nm due to an efficient &lt;em&gt;Eu&lt;/em&gt;&lt;sup&gt;&lt;em&gt;3+&lt;/em&gt;&lt;/sup&gt;&lt;em&gt;→Tb&lt;/em&gt;&lt;sup&gt;&lt;em&gt;3+&lt;/em&gt;&lt;/sup&gt; ET process with 93.58 % efficiency, following a dipole-dipole interaction mechanism. The Tb&lt;sup&gt;3+&lt;/sup&gt;→Eu&lt;sup&gt;3+&lt;/sup&gt; ET enabled tunable emissions from red to green by varying dopant concentrations. When combined with n-UV LED chips, these NPs produced red, green, and white emissions, highlighting their potential for white light emitting device (w-LEDs) applications. Thermal stability is excellent, retaining 92.8 % luminescence at 420 K, with an activation energy of 0.3047 eV, S&lt;sub&gt;r&lt;/sub&gt; of 0.718 % K&lt;sup&gt;−1&lt;/sup&gt; at 300 K, and an internal quantum efficiency (&lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;QE&lt;/em&gt;&lt;/sub&gt;) of 87.58 %. Integration with BAM: Eu&lt;sup&gt;2+&lt;/sup&gt; blue phosphors and a 370 nm n-UV chip enabled fabrication of w-LEDs with a high color rendering index (CRI) &lt;em&gt;R&lt;/em&gt;&lt;sub&gt;&lt;em&gt;a&lt;/em&gt;&lt;/sub&gt; = 91 and a correlated color temperature (CCT) of 5232 K, suitable for indoor lighting. Beyond solid-state lighting, these NPs demonstrated high-resolution latent fingerprints (LFPs) detection. In this work, we proposed a comprehensive strategy for quantifying the fluorescence contrast of fingerprints, integrating both fluorescence intensity and color indices through photoluminescence (PL) spectroscopy analysis. The intensity index (I) reflects the relative fluorescence intensity between the fingerprint and its background, while the color index encompasses three components: hue, saturation, and value (L), with hue and saturation represented collectively by the chroma (C) parameter. The overall fluorescence contrast is defined as the product of relative intensity, chroma, and the common logarithm of the value index (I·C·log L). This approach is employed to quantify fingerprints deposited on various substrates using optimized YAM:5 %Eu&lt;sup&gt;3+&lt;/sup&gt;, 2 %Tb&lt;sup&gt;3+&lt;/sup&gt; nanoparticles, exhibiting high sensitivity, accuracy, and an excellent detection limit. Thus, the developed fluorescence contrast quantification and enhancement method using YAM:5 %Eu&lt;sup&gt;3+&lt;/sup&gt;, 2 %Tb&lt;sup&gt;3+&lt;/sup&gt; NPs provides a novel and effective tool for practical forensic anal","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117090"},"PeriodicalIF":3.8,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ethyl cellulose as a host material for thermally-activated delayed fluorescence emitters","authors":"Daiva Tavgeniene ,&nbsp;Gintare Krucaite ,&nbsp;Dovydas Blazevicius ,&nbsp;Saulius Grigalevicius ,&nbsp;Alla Bogoslovska ,&nbsp;Amjad Ali ,&nbsp;Glib Baryshnikov ,&nbsp;Petro Smertenko ,&nbsp;Mats Fahlman ,&nbsp;Andrei Smertenko ,&nbsp;Oleg Dimitriev","doi":"10.1016/j.optmat.2025.117097","DOIUrl":"10.1016/j.optmat.2025.117097","url":null,"abstract":"<div><div>Thermally-activated delayed fluorescence (TADF) emitters are typically introduced to the OLEDs by doping into a host matrix to prevent emission losses caused by aggregation, concentration quenching, and unwanted excimer emission. While small molecules are usually chosen for the host matrix design, polymers could offer better solution processing and lower production costs for light-emitting structures. In this study, we demonstrate that ethyl cellulose (EC), an environmentally friendly polymer, can serve as a host matrix for specific TADF molecules, enabling the preparation of high-quality films through solution processing. We found that the relative photoluminescence (PL) quantum yield of composite samples using the EC matrix is enhanced by about ten times compared to neat solid-state films of the same dyes. Our PL emission spectroscopy and fluorescence microscopy studies on two pairs of donor-acceptor-donor molecules—each pair having the same donor units but different sulfonyl or carbonyl acceptor groups—revealed distinct morphologies and complex emission bands. The emission color was determined by the interplay of emission components in the multicomponent charge-transfer band. Neat dye films showed aggregated species with red-shifted charge-transfer emission, while guest-host systems exhibited smooth morphology with brighter, more even, and blue-shifted emission. The enhanced PL emission in composite films is attributed to a model where emitter molecules are frozen in the polymer matrix, adopting a restricted twisting disorder. In contrast, the PL emission in neat dye films is weakened due to the higher molecular twisting disorder. We suggest that the interface between EC and the guest molecules facilitates their specific intermolecular packing and suppresses intramolecular twisting upon photoexcitation, leading to a dominant locally excited state and a resulting blue shift in the emission spectrum.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117097"},"PeriodicalIF":3.8,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carrier selection in downshifting perovskite quantum dot films for crystalline silicon solar cells","authors":"Suteng Qu ,&nbsp;Jiahao Wu ,&nbsp;Jiantao Xu ,&nbsp;Peng Wang ,&nbsp;Jian Song","doi":"10.1016/j.optmat.2025.117100","DOIUrl":"10.1016/j.optmat.2025.117100","url":null,"abstract":"<div><div>Crystal silicon solar cells have long dominated the photovoltaic market, but their photoelectric conversion efficiencies are difficult to further improve. Although some studies have proposed to coat perovskite quantum dot downshifting film on surface of the device, there remains a lack of systematic research on the interaction between the quantum dots and their carriers. We selected three typical polymers in optical film, ethylene-vinyl acetate copolymer (EVA), polymethyl methacrylate copolymer (PMMA) and ethylene-methyl methacrylate copolymer (EMMA), and mixed them with perovskite quantum dots solutions to prepare composite films. Through component analysis, optical characterization, and theoretical calculations, we systematically explored the interaction between different polymers and perovskite quantum dots. Under protection of three composite downshifting films based on EVA, PMMA, and EMMA, the efficiencies of crystal silicon cells were increased by 0.49 %, 0.21 % and 0.81 %, respectively. As demonstrated by density functional theory calculations, it is the strong interaction between polymer chains and perovskite quantum dots make EMMA become the champion carrier for perovskite quantum dot. This study presents a promising perovskite quantum dot/polymer composite film characterized by low production costs and stable performance, demonstrating significant potential in the field of photovoltaics.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"164 ","pages":"Article 117100"},"PeriodicalIF":3.8,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143881381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The structure and optical properties of CdS films prepared by sulfur-atmosphere annealing of precursors","authors":"Xuemei Li ,&nbsp;Shanshan Li ,&nbsp;Rui Cui ,&nbsp;Yongbo Zhang ,&nbsp;Bo Yue ,&nbsp;Rengang Zhang ,&nbsp;Peng Zhang ,&nbsp;Runsheng Yu ,&nbsp;Fuyan Liu ,&nbsp;Xingzhong Cao","doi":"10.1016/j.optmat.2025.117098","DOIUrl":"10.1016/j.optmat.2025.117098","url":null,"abstract":"<div><div>High-quality CdS thin films were successfully fabricated using the sputtering-evaporation-sputtering method in conjunction with annealing in sulfur-vapor atmosphere. The structure, morphology, composition, optical properties and defects of the films were investigated by X-ray diffraction, scanning electron microscope, atomic force microscopy, UV–Vis spectrophotometer, and Slow Positron Doppler Broadening Spectroscopy. The results show that precursors include Cd and CdS and are converted into CdS films during annealing. The CdS films exhibit a hexagonal structure with oriented growth along the (002) crystal plane. And the CdS films have a dense structure without any cracks or pinholes and their S/Cd atomic ratios are in the range of 0.98–1.07. All CdS films have high transmittance in the visible range and band gap in the range of 2.38–2.41eV. Sulfur-atmosphere annealing improves the crystallinity, optical transmittance, and chemical composition of the CdS films. Besides, as annealing temperature increases, the crystallite size of the CdS films enhances with the rms surface roughness of 5.18–7.9 nm. It is also found that defect concentration in the annealed films decreases with increasing depth from the surface. And increasing annealing temperature is beneficial to improve the crystallinity of CdS films, attributed to the sulfur diffusion and occupation of sulfur vacancies. The CdS film annealed at 500 °C shows the good crystallinity, high uniformity, and low defect concentration, which can be utilized for photodetectors.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117098"},"PeriodicalIF":3.8,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pressure-induced modifications of magnetic and optical properties in Yb3+-doped CrBr3","authors":"Thom J. Snoeren ,&nbsp;Marina T. Candela ,&nbsp;Rafael Valiente ,&nbsp;Daniel R. Gamelin","doi":"10.1016/j.optmat.2025.117102","DOIUrl":"10.1016/j.optmat.2025.117102","url":null,"abstract":"<div><div>The optical properties of Yb³⁺-doped CrBr₃ have been measured at various pressures, using Yb³⁺ as a spin-bearing luminescent probe of short-range magnetic order. The trends in Raman and optical absorption with pressure indicate compression of [CrBr₆]^3- octahedra with a uniform Cr³⁺-Br^- bond-length contraction of ∼0.005 Å/GPa, despite the soft van der Waals gap. The <em>f-f</em> photoluminescence of Yb³⁺ redshifts with increasing pressure, attributed to enhanced Yb³⁺ <em>f</em>-orbital covalency leading to an increased sensitivity to Br^- spin-orbit coupling at high pressure. An increase in the energy difference between Yb³⁺ up and down (pseudo)spin ground states is observed with increasing pressure, reflecting enhanced Yb³⁺-Cr³⁺ magnetic exchange coupling because of the shortened metal-halide bond lengths. A decrease in <em>T</em>_C of CrBr₃ with increasing pressure counteracts this effect. Exchange splitting of the Yb³⁺ ground state is still observed even above the magnetic ordering temperature of CrBr₃ due to non-cancelling short-range Yb³⁺-Cr³⁺ exchange interactions. Analysis reveals a discontinuity in the pressure dependence of the Yb³⁺-Cr³⁺ magnetic exchange coupling strength (<em>J</em>_Yb-Cr) at ∼3.5 GPa, attributed to a loss of magnetic correlation and a reduction of <em>T</em>_C under pressure. These results highlight the versatility of Yb³⁺ as an optical probe of bonding and magnetism in CrBr₃, and more generally as a designer defect for spin-photonic functionalization in this class of 2D van der Waals magnets.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117102"},"PeriodicalIF":3.8,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancement of upconversion in Nd3+/Yb3+ co-doped tellurite glass microspheres produced by a plasma arc","authors":"Snigdha Thekke Thalakkal ,&nbsp;Davor Ristić ,&nbsp;Zsolt Kis ,&nbsp;Hrvoje Gebavi ,&nbsp;Mile Ivanda","doi":"10.1016/j.optmat.2025.117046","DOIUrl":"10.1016/j.optmat.2025.117046","url":null,"abstract":"<div><div>In this paper, we report enhanced upconversion emission in Nd<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> and Yb<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> co-doped tellurite glass microspheres, fabricated via the plasma torch method. The upconversion efficiency was found to be much stronger in the produced microspheres in respect to the precursor glass, which we attribute to the change of luminiscence properties induced by the microsphere production process. The samples were excited using a 980 nm laser, and the upconversion behavior was analyzed under increasing power using Raman spectroscopy. The rapid thermal quenching of the glass powder during microsphere formation significantly enhanced the upconversion efficiency observed in the spherical samples. Emission and absorption characteristics were comprehensively analyzed using Raman and UV–visible spectroscopy, respectively. Furthermore, lifetime luminescence measurements were performed at emission wavelengths of 590 nm, 870 nm, and 980 nm.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"164 ","pages":"Article 117046"},"PeriodicalIF":3.8,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing luminescent and mechanical properties of carboxymethylcellulose films: The role of glycerol in lanthanide complex incorporation","authors":"Ana Beatriz Catel,&nbsp;Fernanda Ferraz Camilo,&nbsp;Celso Molina","doi":"10.1016/j.optmat.2025.117092","DOIUrl":"10.1016/j.optmat.2025.117092","url":null,"abstract":"<div><div>Developing flexible luminescent materials through immobilizing lanthanide ion complexes in plasticized carboxymethylcellulose (CMC) films presents a significant challenge. This study focused on the synthesis of CMC films incorporating [Eu(tta)₃(H₂O)₂] and [Tb(acac)₃(H₂O)₃] complexes, with varying amounts of glycerol as a plasticizer, using casting technique deposition. The resulting films exhibited amorphous characteristics and thermal stability up to approximately 245 °C. Photoluminescence studies revealed that films containing the Eu³⁺ complex displayed intense emission in the red region (614 nm) when excited at 352 nm, attributed to the antenna effect. Notably, the CMC_Eu_20.0 GLY film, with the highest concentration of plasticizer, showed significant enhancements in experimental lifetime (0.69 ms) and quantum efficiency (39 % q (⁵D₀)) compared to the pristine complex (0.22 ms and 24 %, respectively). Films containing the Tb³⁺ complex, when excited at 300 nm, exhibited strong emission in the green region at 546 nm. An increase in excited lifetime was observed with increasing glycerol content, reaching a maximum of 1.50 ms at 15 % glycerol concentration. The mechanical properties of the films were significantly influenced by plasticizer content. The addition of 20 % glycerol resulted in a substantial increase in elongation at break from 8.9 % to 39.5 %. However, it also led to increased flexibility and reduced traction resistance, as evidenced by the decrease in Young's modulus from 3.4 to 1.5 MPa and breaking stress from 12.4 to 5.6 MPa. Interestingly, the incorporation of lanthanide complexes did not significantly affect the mechanical properties of the films. This finding suggests that luminescent properties can be tailored independently of the mechanical characteristics, offering versatility in material design for various applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"165 ","pages":"Article 117092"},"PeriodicalIF":3.8,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}