Optical Materials: X最新文献

New type of symmetry inhomogeneity in β-TCP-type phosphors: symmetrical features of mixed oxysalts β- tcp型荧光粉的新型对称不均匀性：混合氧盐的对称特征

Optical Materials: X Pub Date : 2025-07-01 DOI: 10.1016/j.omx.2025.100421

I.V. Nikiforov , V.V. Titkov , E.S. Zhukovskaya , M.M. Klimenko , E.A. Pankrushina , А.А. Vasin , D.V. Deyneko

{"title":"New type of symmetry inhomogeneity in β-TCP-type phosphors: symmetrical features of mixed oxysalts","authors":"I.V. Nikiforov , V.V. Titkov , E.S. Zhukovskaya , M.M. Klimenko , E.A. Pankrushina , А.А. Vasin , D.V. Deyneko","doi":"10.1016/j.omx.2025.100421","DOIUrl":"10.1016/j.omx.2025.100421","url":null,"abstract":"<div><div>This study shows the modification of photoluminescent properties (PL) of red-emitting β-Ca3(PO4)2-type (β-TCP) phosphor through anionic sublattice substitution. A new series of Eu3+-activated Ca9La(PO4)7(1–x)(VO4)7x were synthesized using the solid-state method. X-ray powder diffraction study shows that all sample have β-TCP structure, however the differences in symmetry between the samples was found by second harmonic generation method. The unusual centrosymmetric structure appeared at 0.2 ≤ x ≤ 0.5 in Ca9La(PO4)7(1–x)(VO4)7x:Eu3+. Study of the series' photoluminescence properties revealed significant improvement in Eu3+-emission intensity for centrosymmetric samples. The PO4 ↔ VO4 substitution at 0.2 ≤ x ≤ 0.5 resulted in a 1.6-fold enhancement of Eu3+ photoluminescent properties. The emission intensity changes correspond to variations in the anionic part of the structure while maintaining constant activator concentration. The optical band-gap of the synthesized phosphors was estimated at ∼3 eV. Characteristic lifetimes decreased from 1.796 to 0.538 ms with increasing VO4 content. Quantum yields reached 34 % with just 1 mol.% of Eu3+. The crystal structure variation proposed here serves as an effective tool for improving photoluminescence properties of rare-earth ions.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"27 ","pages":"Article 100421"},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144887428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface mechanics of GaAsP/GaAs epilayers for non-linear optical devices 非线性光学器件用GaAsP/GaAs薄膜的表面力学研究

Optical Materials: X Pub Date : 2025-07-01 DOI: 10.1016/j.omx.2025.100420

Samuel M. Linser , Shivashankar R. Vangala , Harris J. Hall , Duane Brinegar , Timothy A. Prusnick , Vladimir L. Tassev

{"title":"Surface mechanics of GaAsP/GaAs epilayers for non-linear optical devices","authors":"Samuel M. Linser , Shivashankar R. Vangala , Harris J. Hall , Duane Brinegar , Timothy A. Prusnick , Vladimir L. Tassev","doi":"10.1016/j.omx.2025.100420","DOIUrl":"10.1016/j.omx.2025.100420","url":null,"abstract":"<div><div>We report on nanoindentation measurements of hydride vapor phase epitaxy (HVPE) grown Gallium Arsenide Phosphide (GaAs1-xPx) epilayers, of interest for generation of mid-infrared wavelengths via frequency conversion. Our results indicate a linear trend in Young's modulus with increasing phosphorus content (P-content), in keeping with Vegard's Law for ternary compounds. The corresponding data for hardness demonstrate significant bowing with a peak of 10.7 GPa occurring at 78 % P-content. Some epilayers exhibit non-negligible spatial variation in their mechanical properties, which is investigated with complementary measurements. Photoluminescence measurements indicate high composition uniformity, while atomic force microscopy reveals a direct correlation between surface roughness and mechanical variability. Preliminary laser-induced damage threshold (LIDT) results are reported, and the implications for material optimization are discussed. With a 1070-nm continuous wave laser, GaAs0.75P0.25 and GaAs0.52P0.48 epilayers demonstrated LID thresholds of 600 kW/cm2 and 300 kW/cm2, respectively.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"27 ","pages":"Article 100420"},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144536184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comprehensive optical characterization of organic thin films for OLED applications via spectroscopic ellipsometry 有机发光二极管应用中有机薄膜的综合光学特性

Optical Materials: X Pub Date : 2025-07-01 DOI: 10.1016/j.omx.2025.100419

I. Aulika, P. Paulsone, J. Butikova, K.A. Štucere, A. Vembris

{"title":"Comprehensive optical characterization of organic thin films for OLED applications via spectroscopic ellipsometry","authors":"I. Aulika, P. Paulsone, J. Butikova, K.A. Štucere, A. Vembris","doi":"10.1016/j.omx.2025.100419","DOIUrl":"10.1016/j.omx.2025.100419","url":null,"abstract":"<div><div>In this study, spectroscopic ellipsometry was employed to characterize the optical properties of 19 different organic thin films used in the fabrication of organic light-emitting diodes (OLEDs). The films were deposited via thermal evaporation onto quartz and soda lime float glass substrates coated with a SiO2 buffer layer and indium tin oxide (ITO). The analysis included a range of organic compounds, from widely studied materials such as CBP (4,4′-Bis(N-carbazolyl)-1,1′-biphenyl) to less-explored compounds such as TAZ (3-(Biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole), PO-T2T ((1,3,5-Triazine-2,4,6-triyl)tris(benzene-3,1-diyl)tris(diphenylphosphine oxide)), CzSi (9-(4-tert-butylphenyl)-3,6-bis(triphenylsilyl)-9H-carbazole), and NBphen (2,9-Dinaphthalen-2-yl-4,7-diphenyl-1,10-phenanthroline). Attention was given to the influence of substrate material on the complex refractive index - specifically, the refractive index (n) and extinction coefficient (k) - across a broad spectral range (210–1690 nm, 0.7–5.9 eV). The results reveal critical insights into substrate-dependent variations, including the presence of refractive index gradients and anisotropic optical behavior in selected organic thin films.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"27 ","pages":"Article 100419"},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deformation-induced enhancement of Ex-emission in RbI and KI single crystals 变形诱导的RbI和KI单晶发射增强

Optical Materials: X Pub Date : 2025-05-24 DOI: 10.1016/j.omx.2025.100416

K. Shunkeyev, Sh Sagimbayeva, A. Kenzhebayeva

引用次数: 0

Special issue on selected papers from the international symposium on optical materials conference, ISOM9: Current research in optical materials 国际光学材料研讨会论文精选特刊，ISOM9：光学材料的研究现状

Optical Materials: X Pub Date : 2025-05-01 DOI: 10.1016/j.omx.2025.100412

Prof. Xavier Mateos (Guest Editors), Prof. Akira Yoshikawa (Guest Editors), Prof. Francesc Díaz (Guest Editors)

引用次数: 0

Withdrawal notice to: “Methane sensors based on ZnGa2O4 ceramics with addition of Er for combustion monitoring systems” [Opt. Mater. X 26C 100409] 撤销通知：“燃烧监测系统中基于ZnGa2O4陶瓷添加Er的甲烷传感器”[Opt. Mater.][26c100409]

Optical Materials: X Pub Date : 2025-05-01 DOI: 10.1016/j.omx.2025.100413

Аleksei V. Almaev , Zhakyp T. Karipbayev , Ernar B. Zhurkin , Nikita N. Yakovlev , Olzhas I. Kukenov , Alexandr O. Korchemagin , Gulzhanat A. Akmetova-Abdik , Kuat K. Kumarbekov , Amangeldy M. Zhunusbekov , Leonid A. Mochalov , Ekaterina A. Slapovskaya , Anatoli I. Popov

引用次数: 0

Study of the effect of phase formation processes on the change in optical and thermal properties of Nd2Zr2O7 ceramics with a pyrochlore structure 研究相形成过程对具有热核结构的 Nd2Zr2O7 陶瓷的光学和热学特性变化的影响

Optical Materials: X Pub Date : 2025-03-07 DOI: 10.1016/j.omx.2025.100410

Artem L. Kozlovskiy , Dmitriy I. Shlimas , Natalya Volodina , Gulnaz ZhMoldabayeva , Mussa Kabiyev , Marina Konuhova

{"title":"Study of the effect of phase formation processes on the change in optical and thermal properties of Nd2Zr2O7 ceramics with a pyrochlore structure","authors":"Artem L. Kozlovskiy , Dmitriy I. Shlimas , Natalya Volodina , Gulnaz ZhMoldabayeva , Mussa Kabiyev , Marina Konuhova","doi":"10.1016/j.omx.2025.100410","DOIUrl":"10.1016/j.omx.2025.100410","url":null,"abstract":"<div><div>The paper presents the results of studies of the influence of phase formation processes with variations in annealing temperature on the processes of stabilization of the crystal structure, optical and thermal properties of Nd2Zr2O7 ceramics, which have great potential for use in optoelectronic applications due to the transitions of Nd3 ions, as well as high stability to external factors with the possibility of creating transparent ceramics. During the conducted studies it was established that the stabilization temperature of the Nd2Zr2O7 phase is 1100–1250 °C, at which the throughput is maximum, and the thermal conductivity coefficient is about 2.1–2.2 W/m × K. The assessment of phase transformations and changes in optical properties revealed that an elevation in the annealing temperature, leading to stabilization of the Nd2Zr2O7 phase, leads to a decrease in the concentration of oxygen vacancies in the structure of ceramics; however, at temperatures above 1200 °C, the observed growth in oxygen vacancies is due to the effects of substitution of Zr4+ cations by Nd3+ cations, which results in formation of additional oxygen vacancies in the structure, alongside impurity inclusions in the form of a cubic phase of Zr(Nd)O2, which is a product of phase polymorphic transformations during high-temperature annealing. Alterations in the thermophysical properties of Nd2Zr2O7 ceramics are directly dependent on phase formation processes and associated changes in the concentration of oxygen vacancies, which are the determining factor influencing the heat transfer rate.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"26 ","pages":"Article 100410"},"PeriodicalIF":0.0,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Methane sensors based on ZnGa2O4 ceramics with addition of Er for combustion monitoring systems 燃烧监测系统中基于ZnGa2O4陶瓷添加Er的甲烷传感器

Optical Materials: X Pub Date : 2025-03-07 DOI: 10.1016/j.omx.2025.100409

Аleksei V. Almaev , Zhakyp T. Karipbayev , Ernar B. Zhurkin , Nikita N. Yakovlev , Olzhas I. Kukenov , Alexandr O. Korchemagin , Gulzhanat A. Akmetova-Abdik , Kuat K. Kumarbekov , Amangeldy M. Zhunusbekov , Leonid A. Mochalov , Ekaterina A. Slapovskaya , Anatoli I. Popov

{"title":"Methane sensors based on ZnGa2O4 ceramics with addition of Er for combustion monitoring systems","authors":"Аleksei V. Almaev , Zhakyp T. Karipbayev , Ernar B. Zhurkin , Nikita N. Yakovlev , Olzhas I. Kukenov , Alexandr O. Korchemagin , Gulzhanat A. Akmetova-Abdik , Kuat K. Kumarbekov , Amangeldy M. Zhunusbekov , Leonid A. Mochalov , Ekaterina A. Slapovskaya , Anatoli I. Popov","doi":"10.1016/j.omx.2025.100409","DOIUrl":"10.1016/j.omx.2025.100409","url":null,"abstract":"<div><div>Ceramic pellets of pure ZnGa2O4 and ZnGa2O4 with Er-addition are synthesized and their structural and gas-sensitive properties are investigated. The addition of Er leads to the formation of a second Er3Ga5O12 phase in the ZnGa2O4 matrix and a larger active surface which allows an 11.1-fold increase in the response of ZnGa2O4 to 104 ppm of CH4. At the maximum response temperature corresponding to 650 °C, the responses to 100 and 104 ppm of CH4 for ZnGa2O4 with Er addition were 2.91 a.u. and 20.74 a.u., respectively. ZnGa2O4 with Er addition is characterized by a wide dynamic range of CH4 concentrations, from 100 ppm to 20000 ppm, weak dependence of gas-sensitive characteristics on humidity in the relative humidity range of 30–70 %, weak changes of gas-sensitive characteristics under cyclic gas exposure. The samples also demonstrate high responses to NO2 and H2, which at a gas concentration of 100 ppm and a temperature of 650 °C are 3.37 a.u. and 4.77 a.u., respectively. A plausible mechanism of the sensing effect of ZnGa2O4 with Er addition is proposed and prospects for the development of high-temperature CH4 sensors based on the studied samples for combustion monitoring systems and determination of the ideal fuel/air mixture are discussed.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"26 ","pages":"Article 100409"},"PeriodicalIF":0.0,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatial mapping of optical constants and thickness variations in ITO films and SiO2 buffer layers ITO薄膜和SiO2缓冲层光学常数和厚度变化的空间映射

Optical Materials: X Pub Date : 2025-03-07 DOI: 10.1016/j.omx.2025.100408

I. Aulika, P. Paulsone, E. Laizane, J. Butikova, A. Vembris

{"title":"Spatial mapping of optical constants and thickness variations in ITO films and SiO2 buffer layers","authors":"I. Aulika, P. Paulsone, E. Laizane, J. Butikova, A. Vembris","doi":"10.1016/j.omx.2025.100408","DOIUrl":"10.1016/j.omx.2025.100408","url":null,"abstract":"<div><div>In this work, we present detailed spectroscopic ellipsometry (SE) measurements across thirty indium tin oxide In2O3–SnO2 (ITO) substrates, providing insights into variations in the complex refractive index <math><mrow><mover><mi>N</mi><mo>˜</mo></mover></mrow></math> for the same commercial ITO material. This study includes an analysis of the distribution of ITO surface roughness, ITO thickness, SiO2 buffer layer thickness, and the complex refractive index of ITO including electrical resistivity and its gradient. The SE mapping, conducted over a (1.5 × 1.5) cm scan area on multiple substrates of (2.5 × 2.5) cm size, reveals uniformity in above parameters within single ITO substrate. However, substantial thickness variations in the SiO2 buffer layer along with fluctuations in the <math><mrow><mover><mi>N</mi><mo>̃</mo></mover></mrow></math> of ITO are observed across the set of substrates. Our findings underscore the importance of individually assessing each ITO substrate's optical properties prior to additional layer deposition, as this precision is essential for reliable investigations of other materials, such as organic compounds in OLEDs, in both ex-situ and in-situ studies. Additionally, this article provides comprehensive optical property data for ITO substrates consisting of soda lime float glass coated with a thin SiO2 buffer layer.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"26 ","pages":"Article 100408"},"PeriodicalIF":0.0,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

La doped Lu2O3 scintillator doed Lu2O3闪烁器

Optical Materials: X Pub Date : 2025-02-23 DOI: 10.1016/j.omx.2025.100405

Jarek Glodo, Yimin Wang, Urmila Shirwadkar, Lakshmi Soundara Pandian

{"title":"La doped Lu2O3 scintillator","authors":"Jarek Glodo, Yimin Wang, Urmila Shirwadkar, Lakshmi Soundara Pandian","doi":"10.1016/j.omx.2025.100405","DOIUrl":"10.1016/j.omx.2025.100405","url":null,"abstract":"<div><div>Lu2O3 has emerged as a highly attractive host material for gamma-ray detection, primarily due to its high density (9.4 g/cm3) and effective atomic number (68). Various dopants have been explored to enhance its scintillation properties, with notable examples including Eu3+ and Yb3+. While Eu3+ doping results in high luminosity, it suffers from a prolonged decay time in the millisecond range. On the other hand, Yb3+ produces a fast scintillation response in the nanosecond range, but at the cost of a significantly lower light yield. Both dopants present limitations for gamma-ray spectroscopy.</div><div>Recently, we developed a novel variant of Lu2O3 doped with La3+. Given the high melting point of the host material (2490 °C), ceramic consolidation techniques were employed during synthesis, leveraging the optically isotropic cubic structure of the material. This composition offers a balanced set of properties, exhibiting a light yield as high as 20,000 photons/MeV and two dominant decay time components at 530 ns and 1230 ns. Additionally, the energy resolution at 662 keV was measured to be 5.3 %, which can be attributed to the material's highly proportional response.</div><div>Optimization of La3+ concentration revealed that the best results were achieved at a doping level of around 5 %. The material demonstrated excellent timing properties, with a fast rise time, <600 ps, and a single-channel timing resolution measured at 511 keV is 307ps. This composition is highly suited for radiation detection applications where intrinsic background noise is not a concern, such as in radiography. Furthermore, its superior timing characteristics and high stopping power make it attractive for Positron Emission Tomography (PET).</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"26 ","pages":"Article 100405"},"PeriodicalIF":0.0,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0