Optical Materials: X最新文献_第3页

Relationship between Ce3+ 5d1 level, conduction-band bottom, and shallow electron trap level in Gd3Ga5O12:Ce and Gd3Al1Ga4O12:Ce crystals studied via pump-probe absorption spectroscopy 通过泵探吸收光谱研究 Gd3Ga5O12:Ce 和 Gd3Al1Ga4O12:Ce 晶体中 Ce3+ 5d1 电平、导带底层和浅电子陷阱电平之间的关系

Optical Materials: X Pub Date : 2025-02-01 DOI: 10.1016/j.omx.2024.100398

Mamoru Kitaura , Heishun Zen , Shinta Watanabe , Hirokazu Masai , Kei Kamada , Kyoung-Jin Kim , Akira Yoshikawa , Jumpei Ueda

{"title":"Relationship between Ce3+ 5d1 level, conduction-band bottom, and shallow electron trap level in Gd3Ga5O12:Ce and Gd3Al1Ga4O12:Ce crystals studied via pump-probe absorption spectroscopy","authors":"Mamoru Kitaura , Heishun Zen , Shinta Watanabe , Hirokazu Masai , Kei Kamada , Kyoung-Jin Kim , Akira Yoshikawa , Jumpei Ueda","doi":"10.1016/j.omx.2024.100398","DOIUrl":"10.1016/j.omx.2024.100398","url":null,"abstract":"<div><div>Ce3+-doped compounds are typically the preferred materials for the development of inorganic phosphors for white LEDs, displays, and scintillators. In this study, pump-probe absorption spectroscopy was performed for Gd3Ga5O12:Ce and Gd3Al1Ga4O12:Ce crystals using ultraviolet (UV) and visible (VIS) pump light, and infrared (IR) probe light. A change in the IR-absorption was observed owing to the generation of free carrier plasma via photoexcitation. Through a simple analysis, the excitation spectra of this change determined the energy at the bottom of the conduction band relative to that at the Ce3+ 4f level. The transient response of the IR-absorption change suggested different relaxation processes for excited electrons in Gd3Ga5O12:Ce and Gd3Al1Ga4O12:Ce. Analysis of the thermally stimulated luminescence (TSL) glow curve determined the trap depth of the electrons in Gd3Al1Ga4O12:Ce. Based on positron annihilation lifetime spectroscopy (PALS), the generation of electron traps was linked to the introduction of vacancy complexes or vacancy aggregates with a negative charge, namely nonstoichiometric compositions. This helps achieve high-quality Ce3+-doped multicomponent oxides.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"25 ","pages":"Article 100398"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182671","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

Luminescence properties of ZnSe single crystals co-doped with Fe and Cr 掺杂铁和铬的 ZnSe 单晶的发光特性

Optical Materials: X Pub Date : 2025-02-01 DOI: 10.1016/j.omx.2024.100393

K. Lamonova , A. Prokhorov , M. Schmidbauer , A. Kwasniewski , Yu Kazarinov , M. Konuhova , A. Platonenko , Z. Remeš , K. Ridzoňová , M. Buryi

引用次数: 0

Phototransferred thermoluminescence of rose quartz: Measurement and analysis 玫瑰石英的光转移热致发光：测量和分析

Optical Materials: X Pub Date : 2025-02-01 DOI: 10.1016/j.omx.2024.100391

M.L. Chithambo , I.A. Ferreira , N.M. Trindade

引用次数: 0

Study of defect formation mechanisms in Li2ZrO3/MgLi2ZrO4 ceramics using EPR spectroscopy 用EPR光谱研究Li2ZrO3/MgLi2ZrO4陶瓷缺陷形成机制

Optical Materials: X Pub Date : 2025-02-01 DOI: 10.1016/j.omx.2024.100396

Dmitriy I. Shlimas , Ainagul A. Khametova , Artem L. Kozlovskiy , Maxim V. Zdorovets

{"title":"Study of defect formation mechanisms in Li2ZrO3/MgLi2ZrO4 ceramics using EPR spectroscopy","authors":"Dmitriy I. Shlimas , Ainagul A. Khametova , Artem L. Kozlovskiy , Maxim V. Zdorovets","doi":"10.1016/j.omx.2024.100396","DOIUrl":"10.1016/j.omx.2024.100396","url":null,"abstract":"<div><div>The article presents the results of experimental studies of the effect of the stabilizing MgO dopant using the electron spin resonance (ESP) method on enhancement of the stability of Li2ZrO3 ceramics to defect formation processes and accumulation of radiolysis products in the near-surface layer in the case of high-dose irradiation with protons simulating the hydrogenation effects characteristic of processes associated with tritium production. During the conducted studies, it was established that the addition of the stabilizing MgO dopant results in formation of inclusions in the form of the tetragonal MgLi2ZrO4 phase, which leads to an increase in the resistance of the near-surface layers to destructive damage due to the accumulation of structural damage (oxygen vacancies and point defects), as well as products of the physicochemical processes of radiolysis, characteristic of high irradiation fluence values. It was found that in the case of unmodified Li2ZrO3 ceramics, the formation of HC2 – centers is observed at a fluence of 1016 proton/cm2, while for two-phase ceramics, the formation of HC2 – centers is observed at higher fluences, while the intensity of the bands is significantly less than in the case of single-phase unmodified ceramics. The difference in the nature of changes in the intensities of singlet bands responsible for the presence of vacancy defects in the damaged layer, as well as HC2 – centers for single-phase and two-phase ceramics is a direct confirmation of the inhibition of structural degradation mechanisms in two-phase ceramics.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"25 ","pages":"Article 100396"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181686","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}

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The influence of the conduction band of BaCl2 on the thermal quenching of the Tm2+ 4f125d1→4f13 and 4f13→4f13 luminescence in orthorhombic BaCl2:Tm2+/3+ BaCl2导带对正晶BaCl2:Tm2+/3+中Tm2+ 4f125d1→4f13和4f13→4f13发光热猝灭的影响

Optical Materials: X Pub Date : 2025-02-01 DOI: 10.1016/j.omx.2024.100389

M.P. Plokker, H.T. Hintzen

{"title":"The influence of the conduction band of BaCl2 on the thermal quenching of the Tm2+ 4f125d1→4f13 and 4f13→4f13 luminescence in orthorhombic BaCl2:Tm2+/3+","authors":"M.P. Plokker, H.T. Hintzen","doi":"10.1016/j.omx.2024.100389","DOIUrl":"10.1016/j.omx.2024.100389","url":null,"abstract":"<div><div>The positioning of the Tm2+ 4f125d1 and 4f13 energy levels as relative to the conduction band of the orthorhombic BaCl2 host lattice has been determined. Therefore, the energies of the Tm2+ 4f125d1-and excited 4f13-level were retrieved, as relative to the Tm2+ 4f13 ground state. In addition, the energy for exciton creation in the orthorhombic BaCl2 host lattice was established, from which the bandgap energy was determined. This value was found to correspond quite well to known literature values. Furthermore, the Tm3+-Cl- charge transfer transition was determined, from which the energy difference between the Tm2+ 4f13 ground state and the top of the BaCl2 valence band was deduced. A host referred binding energy scheme deduced for BaCl2:Tm2+ then showed that the lowest energy Tm2+ 4f125d1-levels are positioned 0.3–0.5 eV below the BaCl2 conduction band. Room temperature photo-excitation into this level will then most likely result in thermal ionization effects that have an impact on the Tm2+ 4f125d1→4f13 and 4f13→4f13 luminescence and corresponding quantum yield.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"25 ","pages":"Article 100389"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181703","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}

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Preface to the special issue after ESTE 2023 conference ESTE 2023会议后特刊序

Optical Materials: X Pub Date : 2024-12-01 DOI: 10.1016/j.omx.2024.100379

Dariusz Hreniak , Mariusz Stefański , Wiesław Stręk , Rober Tomala , Eugeniusz Zych

引用次数: 0

Luminescence of copper-doped α-quartz crystal after oxygen treatment 氧处理后掺铜 α-石英晶体的发光特性

Optical Materials: X Pub Date : 2024-11-23 DOI: 10.1016/j.omx.2024.100381

A. Trukhin

{"title":"Luminescence of copper-doped α-quartz crystal after oxygen treatment","authors":"A. Trukhin","doi":"10.1016/j.omx.2024.100381","DOIUrl":"10.1016/j.omx.2024.100381","url":null,"abstract":"<div><div>Treatment of copper-doped natural α-quartz in oxygen atmosphere at 1200 °C leads to changes in luminescence properties. The luminescence center of AlO4−-Cu+ is modified. The intensity is low in the annealed sample and increases after X-ray irradiation at 293 K. Annealing of the irradiated sample leads to a strong peak of thermally stimulated luminescence (TSL) at ∼500 K. Its spectral composition is mainly due to the AlO4−-Cu+ center. Irradiation of the sample treated with oxygen at 77 K gives a new TSL peak at ∼180 K and a peak at 244 K existing in the untreated sample. Both peaks were attributed to Cuo centers released from different sites and recombined with a hole in AlO4 having additional oxygen. The introduction of copper ions into quartz removes alkali metal ions and eliminates the corresponding luminescence, but after treatment in oxygen, luminescence with similar parameters is restored at low temperatures. In this case, only the glow of the AlO4−-Cu+ center is observed in the recombination luminescence (TSL and afterglow). Therefore, modification of the AlO4−-Cu + center with oxygen imparts to this center properties similar to the complex center AlO4− (K, Na or Li ion) with monovalent aluminum ions, although the alkali ions are replaced by copper ions. The oxygen-treated sample exhibits an increased efficiency of energy transfer by excitons to the luminescence center, measured as excitation spectra in the region of fundamental absorption of silicon dioxide. The X-ray excitation of the self-trapped exciton luminescence does not depend on oxygen treatment. Also, the spectra of intrinsic optical reflection and Raman scattering do not change compared to the untreated sample. The obtained result is interpreted as a modification of the defect by high-temperature treatment in oxygen.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"25 ","pages":"Article 100381"},"PeriodicalIF":0.0,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720223","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

The effect of temperature factor during heavy ion irradiation on structural disordering of SiC ceramics 重离子辐照时的温度因素对碳化硅陶瓷结构紊乱的影响

Optical Materials: X Pub Date : 2024-11-23 DOI: 10.1016/j.omx.2024.100383

Kymbat M. Tynyshbayeva , Artem L. Kozlovskiy

{"title":"The effect of temperature factor during heavy ion irradiation on structural disordering of SiC ceramics","authors":"Kymbat M. Tynyshbayeva , Artem L. Kozlovskiy","doi":"10.1016/j.omx.2024.100383","DOIUrl":"10.1016/j.omx.2024.100383","url":null,"abstract":"<div><div>The paper presents the results of the influence of heavy ion irradiation on the formation of anisotropic distortions of the crystal structure and electron density distribution in SiC ceramics. The assessment of the change in the properties of the damaged layer was carried out using Raman spectroscopy methods, and using data on structural changes obtained using the X-ray diffraction method. The observed alterations in the spectral modes E1(TO), E2(TO) and A1(LO) depending on the irradiation temperature indicate an anisotropic distortion of the structure, which has a clearly expressed dependence on the irradiation temperature, as well as the type of ions used for irradiation. The assessment results of changes in the electron density distribution contingent upon the irradiation temperature for both types of ion irradiation showed a direct correlation between the irradiation temperature growth and the electron density anisotropic distortion caused by the deformation of chemical bonds. In turn, the combination of the effects of thermal heating and ionization processes causes deformation distortion of chemical bonds, which is most pronounced at high irradiation temperatures, for which thermal expansion of the crystal lattice and accelerated diffusion of vacancy defects play a key role in disordering.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"25 ","pages":"Article 100383"},"PeriodicalIF":0.0,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720222","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

Synthesis and optical properties of LaSrGaO4:RE3+ (RE = Sm, Eu, Ho) single crystals via optical float zone method 通过光学浮区法合成 LaSrGaO4:RE3+（RE = Sm、Eu、Ho）单晶体及其光学特性

Optical Materials: X Pub Date : 2024-11-21 DOI: 10.1016/j.omx.2024.100380

Hasan Yilmaz , Masahiko Isobe , Oliver Clemens , Markus Suta , Pascal Puphal

{"title":"Synthesis and optical properties of LaSrGaO4:RE3+ (RE = Sm, Eu, Ho) single crystals via optical float zone method","authors":"Hasan Yilmaz , Masahiko Isobe , Oliver Clemens , Markus Suta , Pascal Puphal","doi":"10.1016/j.omx.2024.100380","DOIUrl":"10.1016/j.omx.2024.100380","url":null,"abstract":"<div><div>The advancement of synthesis of materials with luminescence properties of lanthanoid ions in various single crystalline host compounds with low phonon energies has facilitated the optimization of numerous materials to meet the specific optical properties required for diverse applications such as new energy resource exploration, light-emitting diodes (LEDs), quantum dot displays, laser technology, sensors, telecommunications, medical diagnostics and more. Enhanced analyses of the luminescence mechanism of lanthanoid ions in various host compounds, which have captivated researchers for many years and culminated in the development of innovative materials for optical applications. To obtain a deeper understanding of the luminescence mechanism of Sm3+, Eu3+, and Ho3+ ions incorporated into the Ruddlesden-Popper-type host compounds (La1-xREx)SrGaO4 (RE = Sm, Eu, Ho and x = 0; 0.05; 0.10) high quality single crystals with homogenous activator distribution grown by the optical floating zone (OFZ) method were examined systematically. X-ray diffraction (XRD) characterization shows that the compound crystallizes in a tetragonal crystal system with the space group I4/mmm (no. 139) with homogenous distribution of the dopants shown via backscattered electron (BSE) imaging. Photoluminescence studies at both 77 K and 298 K reveal that the incorporated lanthanoid ions brightly emit and even show unusual transitions due to the low cutoff phonon energy of the host compound that limits non-radiative loss pathways. Together with a high physical density of ∼6.4 g/cm3, these phosphors could be conceptualized as interesting candidates for X-ray imaging phosphors aiming at high light yields.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"25 ","pages":"Article 100380"},"PeriodicalIF":0.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720221","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

Optical and EPR study of Mn4+ ions in different crystal environments in Mn, Li co-doped MgO 锰、锂共掺氧化镁中不同晶体环境下 Mn4+ 离子的光学和 EPR 研究

Optical Materials: X Pub Date : 2024-11-06 DOI: 10.1016/j.omx.2024.100378

L. Borkovska , K. Kozoriz , I. Vorona , O. Gudymenko , S. Ponomaryov , O. Melnichuk , V. Trachevskii , O. Chukova , L. Khomenkova

{"title":"Optical and EPR study of Mn4+ ions in different crystal environments in Mn, Li co-doped MgO","authors":"L. Borkovska , K. Kozoriz , I. Vorona , O. Gudymenko , S. Ponomaryov , O. Melnichuk , V. Trachevskii , O. Chukova , L. Khomenkova","doi":"10.1016/j.omx.2024.100378","DOIUrl":"10.1016/j.omx.2024.100378","url":null,"abstract":"<div><div>The influence of Li ion on the symmetry of Mn4+ center and its photoluminescence (PL) in MgO:0,01%Mn, 3 % Li ceramics is studied by the X-ray diffraction, electron paramagnetic resonance (EPR), PL and optical absorption methods. It is shown that Li co-doping stimulates conversion of Mn2+ on Mg site into Mn4+ and can decrease symmetry of Mn4+ in a case of their specific close arrangement in the crystal lattice. Two kinds of Mn4+ centers are identified in the EPR and PL spectra: cubic Mn4+ and tetragonal complex Mn4+-Li+. The parameters of corresponding EPR centers are estimated from the experimental spectra (gcub = 1.994, |A|cub = 70.9 × 104 cm−1; g1tetr = g2tetr = 1.994, g3tetr = 1.993, |A|tetr = 71 × 104 cm−1, |D|tetr = 220 × 104 cm−1). The PL lines observed in the low temperature PL spectra are assigned to the specific Mn4+ related centers using a complementary study of PL excitation spectra and temperature dependent PL spectra. The lines at 654 nm and 671 nm are ascribed to R-line of Mn4+ in a site of cubic symmetry and its phonon overtone, correspondingly, as well as the lines at 666 nm and 681 nm are attributed to R2 line of Mn4+ in site with tetragonal symmetry and to its phonon overtone, correspondingly. It is shown that in Mn doped MgO ceramics made without intentional Li co-doping, the cubic Mn4+ center can be present and contribute to the PL spectra.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100378"},"PeriodicalIF":0.0,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660496","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