Optical Materials最新文献

{"title":"Effect of europium doping on structural, optical and fluorescence lifetime studies of CuS nanostructures","authors":"B. Sree Sesha Sudha Gayatri,&nbsp;N. Madhusudhana Rao","doi":"10.1016/j.optmat.2025.116982","DOIUrl":"10.1016/j.optmat.2025.116982","url":null,"abstract":"<div><div>The purpose of the current study was to examine the impact of varying concentrations of Europium (Eu) atoms on the physical properties of copper sulphide (CuS) nanostructures designed for optical and fluorescence studies. CuS nanostructures were grown using the hydrothermal method and subsequently evaluated their structural, optical, and morphological characteristics. Nanostructures of CuS doped with Eu at levels of 0, 1, 3, 5, and 7 at. % were synthesised. For the purpose of analysing their properties, various characterisation instruments like X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS), UV–Vis, photoluminescence, and FESEM were utilised. Chemical states were analysed using XPS. The XRD analysis of CuS revealed its hexagonal structure in the covellite phase and samples doped with Eu showed an increment in crystallite size. Eu-doped CuS nanostructures exhibit bandgap increment with the introduction of doping. FESEM analysis reveals the formation of flower-like structures resembling spheres, while lower magnification identifies the presence of nanoflakes. Room-temperature photoluminescence analysis was performed utilising a fluorescence spectrophotometer, revealing orange-red emission peaks at an excitation wavelength of 350 nm. The colour-correlation temperature (CCT) and colour index of extinction (CIE) values of the synthesised samples indicate significant potential for application in display technology. The analysis of fluorescence lifetime and decay in CuS nanostructures doped with Eu was validated through fluorescence lifetime measurements, indicating that the Eu dopant serves as a fluorescence-enhancing agent. Their unique luminescent properties, particularly the strong red emission, suggest potential applications in red-emitting phosphors, white LEDs, high-energy batteries, and supercapacitors.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116982"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714406","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":"A novel dual optimization reagent enables ultra-bright and air-stable cesium copper iodine thin films","authors":"Fushuai Li ,&nbsp;Chuanhe Ma ,&nbsp;Shu Li ,&nbsp;Jinchun Jiang ,&nbsp;Hailong Wang","doi":"10.1016/j.optmat.2025.116984","DOIUrl":"10.1016/j.optmat.2025.116984","url":null,"abstract":"<div><div>Cesium copper iodine (CsCuI) perovskite LED (PeLED) possesses several advantages, including eco-friendly, high stability, abundant elements, and low cost. Improving the photoluminescent performance and stability of the CsCuI perovskite thin film, which serves as the emissive layer, is crucial for enhancing the overall PeLED performance. This paper reports a dual optimization strategy (DOS) that uses a novel mixed toluene (Tol) and oleic acid (OA) reagent. Tol acts as an antisolvent, and OA serves as a passivator. Experimental results show that the DOS increases crystal nucleation rate and mitigates film defects. The photoluminescence quantum yield (PLQY) of the Cs₃Cu₂I₅ perovskite thin film prepared by DOS exceeds 90 %, and after 40 days of storing in air, the PLQY remains at the initial 88 %. This DOS, mixing antisolvent and passivator, also provides new ideas for improving other lead-free metal halide perovskites.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116984"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714407","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":"Preparation of Zn2GeO4 semiconductor and its performance of UV detection","authors":"Haoyu Wang ,&nbsp;Hongkun Huang ,&nbsp;Teng Ma ,&nbsp;Hao Qiang","doi":"10.1016/j.optmat.2025.116968","DOIUrl":"10.1016/j.optmat.2025.116968","url":null,"abstract":"<div><div>In this work, a ternary metal oxide nanomaterial (Zn₂GeO₄) has been prepared by the combination of laser ablation in liquid and hydrothermal method. The effects of hydrothermal time and temperature on the microstructure and size of Zn₂GeO₄ has been studied. The results shows that the change of hydrothermal temperature has a great effect on the crystallization of the product, while the change of reaction time has no obvious effect on the quality of the product. The analysis of UV-VIS absorption spectra shows that the band gap of synthesized Zn₂GeO₄ is 4.58 eV, which is suitable for UV detection. Finally, we tested the UV detector based on Zn₂GeO₄ nanomaterial, and found that the conductivity of the material increases significantly with the increase of the irradiation laser intensity, indicating that the material has excellent photosensitivity and detection ability.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116968"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714409","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 stability of polymethylphenylsiloxane varnish modified with SiO2 nanoparticles and exposed to solar spectrum quanta","authors":"Mikhail M. Mikhailov,&nbsp;Vladimir A. Goronchko,&nbsp;Semyon A. Yuryev,&nbsp;Alexey N. Lapin,&nbsp;Dmitriy S. Fedosov,&nbsp;Svetlana P. Ivanichko","doi":"10.1016/j.optmat.2025.116980","DOIUrl":"10.1016/j.optmat.2025.116980","url":null,"abstract":"<div><div>The article is focused on the effect of modification with silicon dioxide nanoparticles on the stability of polymethylphenylsiloxane varnish exposed to solar spectrum quanta. The modification was carried out within 0.1–10 wt % of SiO₂ by mixing the varnish with toluene and nanopowder and by subsequent application of ultrasonic waves in order to obtain the even distribution of nanoparticles. The irradiation was performed using a xenon arc lamp with the intensity 3 times higher than solar radiation. The analysis included studying the diffuse reflectance spectra within 0.2–2.5 μm; the optical absorption edge; the solar absorptance; FTIR and XRD spectra obtained after modifying and irradiating the samples; the adhesion of the samples to the aluminum-magnesium alloy substrate. Irradiation of the varnish leads to the appearance of integral absorption band from 295 to 700 nm, which is determined by the radicals formed by irradiation upon after breaking of the chemical bonds Si–Si, Si–C, C–C, C–O, CH₂–H, C–H, and Si–O. The results allowed for determining the optimal concentration value for SiO₂ nanoparticles that provides a 1.3-fold increase in the photostability of optical properties. The resulting modified varnishes can be used to develop thermal control coatings for spacecraft and photostable coatings for solar industry.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116980"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714501","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":"Sm2O3 modulated structural, optical, thermal and electrical properties of LiBaBO3 glasses","authors":"B. Ajay Kumar ,&nbsp;B. Sreenivas ,&nbsp;P. Indira ,&nbsp;A.K. Bhatnagar ,&nbsp;P. Hima Bindu","doi":"10.1016/j.optmat.2025.116978","DOIUrl":"10.1016/j.optmat.2025.116978","url":null,"abstract":"<div><div>Structural, optical, thermal and electrical properties of (1-x)[50B₂O₃–30Li₂O–20BaO]-xSm₂O₃ glasses [where x=0, 0.2, 0.4, 0.6, 0.8 and 1.0 mol%], synthesized by using a traditional melt-quenching technique, are reported in this paper. XRD, SEM/EDX studies on these glasses confirm the glassy structure and also their elemental composition. The densities of the samples, declined from 3.094 to 3.045 g/cm³, as the concentration of the dopant Sm₂O₃ increased, while the molar volume increased from 24.059 to 24.986 cm³/mol. FTIR, Raman spectra and UV–Vis spectra of these glasses to determine their optical characteristics. The direct and indirect band gap energies of the glass samples varied in the ranges of 3.99–3.74 eV and 3.01–2.71 eV, respectively. A decline in the Urbach energy from 0.43 to 0.32 eV is observed with increase of the dopant. The obtained results are discussed with reference to the structural changes in the glass network. The glass transition temperature increased by increasing the dopant concentration and the heating rate according to the DSC analysis of the formed glasses. The activation energy of the glass transition also increased with the dopant concentration. The variation of the DC conductivity with temperature was studied to understand electronic transport phenomena in these glasses.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116978"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706226","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":"Systematic analysis of nonlinear optical properties in pristine and rare-earth-doped Zn2V2O7 for low-power optical limiting applications","authors":"Haritha J ,&nbsp;Mani Rahulan K ,&nbsp;N. Angeline Little Flower ,&nbsp;T. Sharmila ,&nbsp;Sabari Girisun T C ,&nbsp;Annie Sujatha R","doi":"10.1016/j.optmat.2025.116974","DOIUrl":"10.1016/j.optmat.2025.116974","url":null,"abstract":"<div><div>This study focuses on the optical limiting (OL) as well as, nonlinear optical (NLO), properties of pristine and rare-earth (RE) doped zinc pyrovanadate (Zn₂V₂O₇), were systematically investigated through the Z-scan method operated at 532 nm wavelength within the nanosecond domain. RE-doped Zn₂V₂O₇ nanoparticles, where RE = Nd, Er, and Eu, are prepared through the hydrothermal method, and their structural, morphological, and optical properties are studied in detail. The X-ray diffraction studies describe the structure information and surface morphology it exhibits as revealed by scanning electron microscopy. The molecular structures and chemical bonding have been confirmed using Raman spectroscopy and Fourier-transform infrared spectroscopy. The linear absorption studies revealed decreased band gap energy upon doping with RE elements. Nonlinear optical studies conducted using the open-aperture (OA) Z-scan method showed that all the samples exhibited reverse saturable absorption (RSA) behavior through a mechanism involving the simultaneous absorption of two photons. Contrary to the pristine Zn₂V₂O₇, the OL and NLO behavior of the RE-doped samples are strongly enhanced. Among the materials under study, Eu-doped Zn₂V₂O₇ revealed the highest nonlinear optical absorption with better optical limiting performance compared to Nd and Er doping. These findings indicate that Eu-doped Zn₂V₂O₇ can be considered as a material with potential applications in low-power optical limiting devices due to its enhanced optical limiting characteristics and effective nonlinear absorption.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116974"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739008","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":"Polydopamine modified Nd-doped TiO2 films for improved electrochromism and energy storage","authors":"Bo Zhang ,&nbsp;Xiaoxing Yan ,&nbsp;Shengli Liu ,&nbsp;Enze Wu ,&nbsp;Yuanyuan Tian","doi":"10.1016/j.optmat.2025.116969","DOIUrl":"10.1016/j.optmat.2025.116969","url":null,"abstract":"<div><div>Electrochromic materials can show reversible optical changes under the small applied voltages, which have the great application prospects in smart window, energy storage, thermal control fields. In the practical application of electrochromic materials, fast responsiveness and stable periodicity are urgently needed. In this study, the nanoporous Nd-doped TiO₂ (TNO) films are synthesized by the hydrothermal method, and then polydopamine (PDA) is coated on the surfaces of TNO films to prepare TNO-P_t films (t = 15, 30, 60 and 120). TNO-P_t films have the wider transmittance modulations and larger surface capacitances than that of TNO film. Moreover, TNO-P_t films have shorter response times and higher cycle stability due to PDA films enhance the interface ion transfer properties and electrochemical stability of nanoporous TNO films. In particular, the coloring and bleaching times of the TNO-P₆₀ film is 12.4 and 18.3 s, and retained 91.7 % of the initial transmittance modulation (70.3 %) after 2000 cycles. In addition, the surface capacitance of TNO film modified by PDA can be risen to 238 %. Therefore, TNO-P_t films can be used as one candidate material for electrochromic energy saving and storage window.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116969"},"PeriodicalIF":3.8,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680677","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":"Enhanced luminous exitance and saturation threshold of Y3Al5O12:Ce phosphor-in-glass films via incorporation of highly thermally conductive boron nitride particles","authors":"Bingguo Liu ,&nbsp;Yanghan Guo ,&nbsp;Yangzi Li ,&nbsp;Shiqing Pang ,&nbsp;Shunzi Li ,&nbsp;Peng Xu ,&nbsp;Dan Zhao ,&nbsp;Carsten Dam-Hansen ,&nbsp;Jian Xu ,&nbsp;Baoli Du ,&nbsp;Ole Bjarlin Jensen","doi":"10.1016/j.optmat.2025.116973","DOIUrl":"10.1016/j.optmat.2025.116973","url":null,"abstract":"<div><div>Phosphor-in-glass film (PiG-film) displays great potential for high performance laser-driven white lighting, benefiting from its facile fabrication and high efficiency. However, the low thermal conductivity of the glass matrix may lead to thermal quenching of phosphors and limit the maximum luminous flux of the light source. Here, boron nitride (BN) with high thermal conductivity and low absorption coefficient was embedded into Y₃Al₅O₁₂:Ce PiG-film to facilitate the heat-transfer process, and to regulate the propagation of both laser and fluorescence. The influences of BN particle size and doping concentration on surface morphology (pore formation), luminescence saturation threshold (LST), luminous flux, and the spatial distribution of correlated color temperature (CCT) were investigated and correlated. Moreover, the luminescence spot confinement was analyzed and luminous exitance was obtained. Benefiting from the formation of effective BN heat-transfer network, the luminous efficacy of both YAG-45-2 % and YAG-45-1 % films surpass the non-doped one as laser power density &gt;19.00 W/mm². A LST higher than 27.04 W/mm² was observed in YAG-45-2 % film, more than 42 % higher than the non-doped one. Though the extra reflection of blue laser by BN particles downgrades the CCT spatial distribution uniformity, the particles strongly scatter the fluorescence and restrict the fluorescence-emitting spot (diameter) expansion from 307 to 174 μm, and a high luminous exitance of 1614 lm/mm² was achieved in YAG-45-2 % film. These results firmly demonstrate that incorporation of particles with high thermal conductivity and low absorption coefficient in PiG-film is a feasible strategy for achieving high-brightness laser lighting.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116973"},"PeriodicalIF":3.8,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706225","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":"Metallic transition metal dichalcogenide-based single-frequency fiber lasers with sub-kHz linewidths","authors":"Yiyu Gan,&nbsp;Wenyao Zhang,&nbsp;Qiao Wen","doi":"10.1016/j.optmat.2025.116941","DOIUrl":"10.1016/j.optmat.2025.116941","url":null,"abstract":"<div><div>MTe₂ (M = V, Nb), with remarkable physical features, is a typical layered metallic transition metal dichalcogenide that has garnered a lot of interest. It has established a wide range of applications in the disciplines of advanced electronic devices, magnetics, and electrochemistry. Nevertheless, its utilization in single frequency fiber lasers has been rather restricted. MTe₂ (M = V, Nb) samples were exfoliated into a few layers by using liquid phase exfoliation. Next, by carefully depositing MTe2 (M = V, Nb) nanosheets onto the surface of D-shaped fibers, we investigated the potential applications of MTe₂ (M = V, Nb)-based transient bragg grating. This resulted in the successful development of two stable single-frequency fiber lasers based on VTe₂ and NbTe₂, respectively. The center wavelengths of these SFFLs are approximately 1550 nm. The linewidth of NbTe₂, which is the narrowest ever reported for an SFFL based on low-dimensional materials, was measured to be approximately 354.5 Hz, with a signal-to-noise ratio of 72.672 dB. The signal-to-noise ratio of VTe₂ is about 75.22 dB, the highest observed among lasers based on low-dimensional materials.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116941"},"PeriodicalIF":3.8,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714510","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":"Thermal noise reduction in ion-beam sputtered HfO2:Ta2O5 thin films via high-temperature treatment","authors":"Valeria Milotti ,&nbsp;Giulio Favaro ,&nbsp;Massimo Granata ,&nbsp;Danièle Forest ,&nbsp;Christophe Michel ,&nbsp;Julien Teillon ,&nbsp;Nicole Busdon ,&nbsp;Marco Bazzan ,&nbsp;Hanna Skliarova ,&nbsp;Giacomo Ciani ,&nbsp;Carlo Scian ,&nbsp;Livia Conti ,&nbsp;Shima Samandari ,&nbsp;Valentina Venturino ,&nbsp;Michele Magnozzi ,&nbsp;Maurizio Canepa ,&nbsp;Nicholas Demos ,&nbsp;Slawomir Gras ,&nbsp;Matthew Evans ,&nbsp;Valérie Martinez ,&nbsp;Anaël Lemaître","doi":"10.1016/j.optmat.2025.116901","DOIUrl":"10.1016/j.optmat.2025.116901","url":null,"abstract":"<div><div>Reducing coating thermal noise (CTN) in mirrors for gravitational wave (GW) interferometers is pivotal to improving sensitivity in the mid-frequency range. Current mirror coatings are heat-treated (annealed) after deposition in order to partially relax their microstructure and to improve their optical and mechanical properties. The maximum annealing temperature is an important parameter in this respect as a higher thermal energy allows the system to relax to more stable configurations, which is often beneficial for the thermal noise performances of the coatings. However, the useful temperature range is limited by the stability of the amorphous microstructure, since excessive heating eventually leads to the formation of crystalline grains which are detrimental from both the mechanical and optical viewpoints. In this work, inspired by the possibility to improve glass stability in alloys by a careful choice of mixing ratios, we studied ion-beam co-sputtered amorphous HfO₂:Ta₂O₅ thin films with different HfO₂ concentrations, so as to identify conditions that would lead to a higher glass stability in order to explore the effects of a thermal annealing over an extended temperature range. We then deposited a multilayer mirror, alternating layers of HfO₂:Ta₂O₅ with composition providing the highest crystallization temperature and SiO₂ layers. The thermal Brownian noise of the mirror coating was found to decrease with increasing heat-treatment temperatures, reaching losses comparable to the Ti-doped Ta₂O₅ coatings of Advanced LIGO when heated at the highest possible temperature. Our results demonstrate the critical importance of optimizing the film composition and annealing procedure in order to improve the coating performances and the sensitivity for the next generation of GW detectors.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116901"},"PeriodicalIF":3.8,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726293","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}