Optical Materials最新文献

{"title":"Encapsulated multi-resonance TADF dendrimer with AIEE property for efficient solution-processed narrowband deep-blue OLEDs","authors":"Wenhao Zhang ,&nbsp;Xinxin Qian ,&nbsp;Wenli Shi,&nbsp;Jiangqi Jiang,&nbsp;Hai Zhou,&nbsp;Zhijie Wu,&nbsp;Zongyu Yang,&nbsp;Xinxin Ban,&nbsp;Yumeng Xin","doi":"10.1016/j.optmat.2025.117163","DOIUrl":"10.1016/j.optmat.2025.117163","url":null,"abstract":"<div><div>The utilization of multiple resonances (MR) thermally activated delayed fluorescence (TADF) materials for solution-processed organic light-emitting diodes (OLEDs) faced notable challenges in severe aggregation-caused quenching (ACQ) issues. Here, we successfully developed a narrow-band deep blue MR-TADF dendrimer (2CzphQAO) for solution-processed OLEDs by introducing three flexible carbazole branches around carbonyl/N emissive core as encapsulated unit. The branches connected by alkyl chains can not only effectively avoid the severe aggregation quenching of narrowband emission, but also improve its solubility in conventional organic solvents. In addition, 2CzphQAO also exhibits clear aggregation-induced emission enhancement (AIEE) properties in the molecular packaging state, which can effectively promote exciton utilization without causing spectral broadening. The resultant encapsulated MR-TADF dendrimer was able to show bright deep-blue emission peaked at 438 nm with a full width at half maximum (FWHM) of 47 nm. The solution-processed OLEDs based on the dendrimer achieved a maximum external quantum efficiency (EQE max) of 12.1 % with Commission Internationale de l’Eclairage (CIE) coordinate of (0.13,0.14), which is among the promising device efficiency of solution-processed narrowband deep blue OLEDs. This study demonstrates that the encapsulation of rigid MR-TADF molecule will be a feasible strategy for design efficient solution-processable OLEDs with high color purity.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117163"},"PeriodicalIF":3.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144298770","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 photoluminescence of a novel red-emitting phosphor of CaLaGaO4:Eu3+ by lithium ion doping","authors":"Yan Zhao,&nbsp;Zhonghui Li,&nbsp;Jiaxu Wang,&nbsp;Xingsheng Zhao,&nbsp;Changli Liu,&nbsp;Jifeng Ban,&nbsp;Xinlong Zhang,&nbsp;Hengwei Zhou,&nbsp;Xiaokang Jiang","doi":"10.1016/j.optmat.2025.117229","DOIUrl":"10.1016/j.optmat.2025.117229","url":null,"abstract":"<div><div>CaLaGaO₄:Eu³⁺ and Li ⁺ -doped CaLaGaO₄:30 %Eu³⁺ series phosphors were synthesized via high-temperature solid-state reactions. The results show that these phosphors can be efficiently excited by near-ultraviolet light at 392 nm and emit intense red light at 609 nm. The red emission at 609 nm corresponds to the hypersensitive electric dipole transition of Eu³⁺ (⁵D₀ → ⁷F₂). Upon reaching 30 % Eu³⁺ doping concentration, a distinct concentration quenching phenomenon emerges. Subsequent Li⁺ co-doping investigation demonstrates that incorporating 0.5 % Li⁺ induces remarkable luminescence enhancement: (1) The room-temperature fluorescence intensity exhibits 1.56-fold augmentation compared to Li⁺-free counterparts; (2) The absolute quantum yield (QY) increases from 11.3 % to 21.6 %, representing 91.2 % relative improvement; (3) Thermal stability characterization reveals 81.9 % intensity retention at 498 K (vs. 75.0 % in undoped system), corresponding to 9.2 % relative enhancement in thermal endurance. These findings suggest that the introduction of Li⁺ can effectively sensitize and enhance the fluorescence properties of the host matrix, offering a promising strategy for improving the performance of fluorescent materials.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117229"},"PeriodicalIF":3.8,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290676","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 visible photoluminescence in biocompatible liquids obtained by rehydration of Saccharina latissima algae at room temperature","authors":"L. Torrisi ,&nbsp;G. Genovese ,&nbsp;D. Spagnuolo ,&nbsp;D. Lombardo ,&nbsp;A. Torrisi ,&nbsp;M. Cutroneo","doi":"10.1016/j.optmat.2025.117245","DOIUrl":"10.1016/j.optmat.2025.117245","url":null,"abstract":"<div><div>The rehydration process of air-dried algae <em>Saccharina latiss</em>ima, obtained with distilled water and/or with phosphate-buffered saline solution (PBS), led to the formation of a highly photoluminescent liquid. The structure-function relationships for the bioactivities of these algae are still little known and undisclosed. The aim of this work is twofold: to describe the surprising behavior of the <em>Saccharina latiss</em>ima when it is rehydrated at room temperature and to attempt its release in liquids that appear photoluminescent under UV excitation.</div><div>Rehydration seems to release nanometric-sized molecules into the liquid, making it absorbent in the near UV. Polysaccharides and phenols, released by the algae, act as quantum dots dispersed in the liquid. The absorption of UV light by the liquid, at 365 nm, induces luminescence in the visible wavelength region with high emission in the blue band, around 478 nm. Further release removes larger nanoparticles that emit first in the green-yellow regions and subsequently in the brown-orange-red regions.</div><div>Characterization measurements of the biocompatible luminescent liquid were performed by considering optical spectroscopies in the UV, Visible, and IR ranges, and electron microscopy.</div><div>Possible applications, such as bioimaging, diagnostics, and therapy, together with the possibility to realize luminescent films and devices, are proposed, and some are described as well.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117245"},"PeriodicalIF":3.8,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290674","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":"Construction of 2D/3D biochar modified g-C3N4 for efficient removal of tetracycline hydrochloride via photocatalytic PMS activation","authors":"Fukang Feng ,&nbsp;Xiaoyu Zhang ,&nbsp;Xusheng Xu ,&nbsp;Qianyi Huang ,&nbsp;Haixia Yin ,&nbsp;Ruonan Li ,&nbsp;Guangyu Wu ,&nbsp;Weinan Xing","doi":"10.1016/j.optmat.2025.117246","DOIUrl":"10.1016/j.optmat.2025.117246","url":null,"abstract":"<div><div>The conversion of abundant forestry/agricultural residues into value-added photocatalytic materials represents a sustainable strategy for environmental remediation. This study reports a one-step synthesis of wood flour-derived biochar (BC) coupled with 3D flower-like g-C₃N₄ (3D CN) to address the inherent limitations of rapid charge recombination and poor light absorption in bulk g-C₃N₄. Comprehensive characterization revealed that BC incorporation significantly enhanced both charge separation and light-harvesting capabilities. When applied in peroxymonosulfate (PMS) activation under visible light, the optimized 3D BC-CN60 composite demonstrated remarkable tetracycline hydrochloride (TC) degradation efficiency, achieving a first-order kinetic constant (56.04 × 10⁻³ min⁻¹) 5.27-fold higher than pristine 3D CN. Systematic investigations of operational parameters (catalyst dosage, calcination temperature, TC concentration, PMS content, and pH) yielded optimal conditions achieving 98.04 % TC removal within 60 min. Radical quenching experiments identified ¹O₂, •SO₄⁻ as well as •OH as the predominant reactive species, while intermediate analysis proposed two possible degradation pathways. The significantly improved photocatalytic performance is attributed to BC's dual function as both an electron acceptor and conductive bridge, which effectively suppresses charge recombination while promoting interfacial electron transfer. This work provides fundamental insights into biomass-derived carbon materials for designing efficient photocatalytic systems, demonstrating the potential of agricultural waste utilization in advanced oxidation processes for antibiotic wastewater treatment.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117246"},"PeriodicalIF":3.8,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290675","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":"Eu2+/Eu3+ doped Al2O3 coatings formed on tungsten by plasma electrolytic oxidation: photoluminescent properties and application in luminescence thermometry","authors":"Stevan Stojadinović ,&nbsp;Pedro Nelson ,&nbsp;Sanja Kuzman ,&nbsp;Jovana Periša ,&nbsp;Zoran Ristić ,&nbsp;Aleksandar Ćirić","doi":"10.1016/j.optmat.2025.117244","DOIUrl":"10.1016/j.optmat.2025.117244","url":null,"abstract":"<div><div>Plasma electrolytic oxidation (PEO) was employed to synthesize Eu²⁺/Eu³⁺ doped Al₂O₃ coatings on tungsten substrates using an alkaline phosphate electrolyte containing Eu₂O₃ particles at ambient conditions, eliminating the need for high-temperature or reducing atmospheres. The structural, morphological, and photoluminescence (PL) properties of the coatings were investigated. X-ray diffraction (XRD) confirmed the formation of alpha Al₂O₃ as the dominant phase. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) analysis demonstrated uniform coatings with increasing europium content at higher Eu₂O₃ concentrations. The PL spectra exhibited characteristic emissions from both Eu²⁺ (broadband 4<em>f</em>⁶5<em>d</em>¹ → <em>4f</em>⁷) and Eu³⁺ (sharp ⁵<em>D</em>₀ → ⁷<em>F</em>_J) transitions, confirming the coexistence of both valence states. Eu³⁺ excitation spectra feature a charge transfer band and 4<em>f</em>-4<em>f</em> transitions. There is a negligible energy transfer between Eu²⁺ and Eu³⁺ ions. The local coordination of Eu³⁺ and Eu²⁺ ions in Al₂O₃ coatings is analyzed using the PL spectra, showing that both ions are in low-symmetry sites. The luminescence intensity ratio (<em>LIR</em>) of Eu²⁺/Eu³⁺ emissions was utilized for optical thermometry from 300 K to 650 K, showing a quasi-Boltzmann temperature dependence. The temperature-dependent PL studies revealed high absolute sensitivity (0.0008 K⁻¹ @ 575 K), demonstrating the potential of Eu²⁺/Eu³⁺ doped Al₂O₃ coatings for contactless luminescence thermometry applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117244"},"PeriodicalIF":3.8,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289058","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":"Bi–TiO2 nanomaterials in treating toxic water dye pollutants with machine learning models","authors":"Ujwala O. Bhagwat ,&nbsp;Sanjhana Anandan ,&nbsp;Saanvi Goel ,&nbsp;Abdullah Al Souwaileh ,&nbsp;Jerry J. Wu ,&nbsp;Vetriselvi Thirunavukarasu ,&nbsp;Sambandam Anandan ,&nbsp;Muthupandian Ashokkumar","doi":"10.1016/j.optmat.2025.117231","DOIUrl":"10.1016/j.optmat.2025.117231","url":null,"abstract":"<div><div>In the current investigation, bismuth-loaded TiO₂ nanoparticles were effectively synthesized via a single-step ultrasonication technique. The phase identification of the Bi–TiO₂ nanomaterials was carried out using powder X-ray diffraction technique, other physical and chemical characterization methods. Furthermore, variations in bismuth concentrations (0.3 M, 0.5 M, and 0.7 M) led to the observation of a notable decrease in the band gap (3.20, 2.95, 2.91, and 2.80 eV). The efficiency of these samples was evaluated by photocatalytic degradation of Congo red azo dye, a toxic pollutant in aqueous environment. 0.7 M Bi-loaded sample exhibited about 95 % Congo red dye degradation efficacy in 480 min. Additionally, the photodegradation experiments were carried out using a variety of scavengers (Ethylene diamine tetra acetic acid (EDTA), Isopropyl alcohol (IPA), and benzoquinone) to illustrate that the degradation is mainly by OH^● radicals. Machine learning (ML) models were used to predict the photocatalytic degradation efficiency of Bi–TiO₂ nanomaterials in treating Congo red dye. Using Random Forest (RF), Gradient Boosting Decision Trees (GBDT), and XGBoost models, we optimized several experimental conditions such as catalyst concentration, dye concentration, and scavenger presence to maximize degradation efficiency.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117231"},"PeriodicalIF":3.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290677","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":"Structure and nonlinear optical properties of TeO2–WO3–PbO thin film glasses","authors":"G. Gorni ,&nbsp;D. Munoz-Martin ,&nbsp;A. Ruiz de la Cruz ,&nbsp;V. Martin-Diaconescu ,&nbsp;L. Simonelli ,&nbsp;J. Garcia-Lopez ,&nbsp;J.M. Fernandez Navarro ,&nbsp;J. Solis ,&nbsp;J. Gonzalo","doi":"10.1016/j.optmat.2025.117206","DOIUrl":"10.1016/j.optmat.2025.117206","url":null,"abstract":"<div><div>Lead tungsten tellurite thin film glasses have been produced by pulsed laser deposition in a broad TeO₂ compositional range (50–85 mol%). Films present high transparency with an optical band gap <em>E</em>_<em>g</em> = 3.3–3.4 eV, large refractive index (<em>n</em> &gt; 2) and reduced absorption (<em>k</em> &lt; 10⁻⁴) in the visible and near infrared ranges, whereas their nonlinear optical response (<em>∣χ</em>^<em>(3)</em><em>∣</em>) is found to be ≥ 10⁻¹² esu at 1.3 μm. The dependence of <em>n</em>, <em>E</em>_<em>g</em> and <em>∣χ</em>^<em>(3)</em><em>∣</em> with film composition is analyzed and compared with the values determined for the parent bulk glasses. <em>∣χ</em>^<em>(3)</em><em>∣</em> increases as the TeO₂ content in the film glasses decreases, while it remains constant for bulk glasses. This behaviour is analyzed in the frame of Line's model and correlated to the structural differences between bulk and film glasses. In the case of bulk glasses, X-ray absorption spectroscopy results at the W L₃ and L₁-edges clearly indicate the presence of W⁶⁺ ions in a distorted octahedral coordination, with the coordination environment and W–O bond distance remaining unchanged regardless of the WO₃ content. Raman analysis suggests that films have a structure close to that of bulk glasses, with a moderate WO₃ and PbO enrichment, and a relative increase of the non-bridging oxygen fraction that are proposed to be responsible for the observed increase of <em>∣χ</em>^<em>(3)</em><em>∣</em> in the films.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"167 ","pages":"Article 117206"},"PeriodicalIF":3.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279447","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 single-phase white-emitting garnet-structured phosphor with ultra-high luminescent thermal stability and color stability","authors":"Feiyan Xie ,&nbsp;Junqiang Gu ,&nbsp;Dekang Xu ,&nbsp;Xiaodan Zheng ,&nbsp;Qiancheng Xiong ,&nbsp;Qiang Zhang ,&nbsp;Hairui Wu ,&nbsp;Jinyu Yang","doi":"10.1016/j.optmat.2025.117227","DOIUrl":"10.1016/j.optmat.2025.117227","url":null,"abstract":"<div><div>Currently, single-phase white-emitting phosphors have garnered significant attention in the field of phosphor-converted white light-emitting diodes (pc-WLEDs). Unfortunately, poor luminescent thermal stability has severely hindered the development of phosphors for solid-state lighting. In this study, to enhance the luminescent thermal stability of phosphors, and a series of NGGGO:Dy³⁺,Tm³⁺ phosphors were successfully synthesized via the high-temperature solid-state method. The effects of different doping concentrations on the crystal structure, luminescent spectrum, and thermal stability of the phosphors were thoroughly investigated. X-ray diffraction analysis revealed that all the phosphors maintained a garnet structure without the formation of any impurity phases. Photoluminescence spectra demonstrated that under excitation at 353 nm, the yellow emission of Dy³⁺ and the blue emission of Tm³⁺ achieved effective spectral complementarity, yielding white light emission with CIE coordinates of (0.329, 0.329). More importantly, the phosphor exhibited exceptional luminescent thermal stability, maintaining 96.21 % of its luminescent intensity at room temperature even at high temperatures (475 K). This study provided new insights for the development of efficient and thermally stable single-phase white-emitting phosphors, potentially advancing the technology of white LED lighting.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"166 ","pages":"Article 117227"},"PeriodicalIF":3.8,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253451","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":"Green hydrothermal synthesis of Au/TiO2 nanocomposites using eggplant (Solanum melongena L.) peel extract for enhanced photocatalytic hydrogen production","authors":"Naushad Ahmad ,&nbsp;Mohammad Rizwan Khan ,&nbsp;Sonaimuthu Mohandoss ,&nbsp;Kuppu Sakthi Velu","doi":"10.1016/j.optmat.2025.117226","DOIUrl":"10.1016/j.optmat.2025.117226","url":null,"abstract":"<div><div>In this study, we described an environmentally friendly and sustainable approach for the synthesis of TiO₂ NPs and Au/TiO₂ (Au/TiO₂ NPs) nanocomposites utilizing eggplant peel extract (<em>Solanum melongena</em> L.) as a bio-template and complexing agent for enhanced photocatalytic hydrogen (H₂) production. The nanostructures of the TiO₂ NPs and Au/TiO₂ NPs were examined using Field emission-Scanning electron microscopes (FE-SEM) with Energy dispersive spectroscopy (EDS) mapping and Transmission electron microscopes (TEM) images displayed diverse spherical shapes of TiO₂ NPs, while Au/TiO₂ NPs exhibited fine Au particles uniformly distributed on the TiO₂ NPs surface. X-ray diffraction (XRD) pattern confirmed anatase and rutile structures, with Au/TiO₂ NPs exhibiting peaks corresponding to face-centered cubic (fcc) structure of AuNPs. UV–Visible (UV–Vis) absorption spectra indicated a redshift in absorption peaks for Au/TiO₂ NPs and the bandgap energy of TiO₂ NPs was initially measured at 3.06 eV upon incorporation of Au (Au/TiO₂ NPs) decreased to 2.95 eV, a crucial factor for potential photocatalytic applications. Based on the electrochemical H₂ evolution, Au/TiO₂ NPs demonstrated significantly reduced overpotentials measuring at 182 mV along with a Tafel slope of 129 mV/dec under visible light. The photocatalytic H₂ production of TiO₂ NPs and Au/TiO₂ NPs with methanol as a sacrificial electron donor under visible light optimization including reaction time, concentration, catalyst dosage, pH, and temperature were systematically studied. The Au/TiO₂ NPs exhibited a photocatalytic H₂ production rate of 468.3 μmol after 6 cycles with an apparent quantum yield (AQY) reaching 9.3 % was achieved at 420 nm. The results suggest a promising potential for the Au/TiO₂ NPs catalyst in addressing forthcoming challenges associated with both environmental issues and energy concerns.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"166 ","pages":"Article 117226"},"PeriodicalIF":3.8,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241421","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":"Optical refractive properties and phonon spectra of Na2SO4 single crystal","authors":"M. Ya Rudysh ,&nbsp;B.V. Andriyevsky ,&nbsp;P.A. Shchepanskyi ,&nbsp;M. Karkulovska ,&nbsp;V. Yo Stadnyk ,&nbsp;L. Bychto ,&nbsp;R.S. Brezvin","doi":"10.1016/j.optmat.2025.117228","DOIUrl":"10.1016/j.optmat.2025.117228","url":null,"abstract":"<div><div>Na₂SO₄ crystal was grown by slow evaporation method from an aqueous solution. Using the PXRD method, the crystal structure of Na₂SO₄ was investigated at room temperature, and it was found that the crystal belongs to the orthorhombic symmetry of the space group <em>Fddd</em> (no. 70) with the following unit cell parameters: <em>a</em> = 5.8568(4) Å, <em>b</em> = 12.2957(7) Å, <em>c</em> = 9.809(1) Å, and <em>V</em> = 706.52(8) ų. The dispersion of the refractive indices of Na₂SO₄ crystal in the visible and ultraviolet ranges was measured at room temperature and the principle refractive indices of optical indicatrix were determined to be <em>n</em>_<em>X</em> = 1.4703, <em>n</em>_<em>Y</em> = 1.4847, and <em>n</em>_<em>Z</em> = 1.47669 for the wavelength λ = 500 nm. The first-principle calculations of the phonon properties of the crystal were performed using the lattice dynamics method and DFPT approach. The polarized normal incidence reflection spectra of Na₂SO₄ crystal were measured in the infrared range 50–1300 cm⁻¹ by using FTIR spectrometer and synchrotron radiation. The calculated reflection spectra of Na₂SO₄ crystal are in very good agreement with the experimental ones. In Na₂SO₄ crystal, the Reststrahlen band in the spectral range of 1120–1200 cm⁻¹ is confirmed experimentally and theoretically.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"166 ","pages":"Article 117228"},"PeriodicalIF":3.8,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253442","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}