Optical Materials: X最新文献

{"title":"The dual luminescence of M2MgTeO6 (M= Sr, Ba) double perovskites","authors":"E. Cavalli ,&nbsp;F. Mezzadri ,&nbsp;M.M. Natile","doi":"10.1016/j.omx.2024.100337","DOIUrl":"https://doi.org/10.1016/j.omx.2024.100337","url":null,"abstract":"<div><p>Sr₂MgTeO₆ (SMT) and Ba₂MgTeO₆ (BMT) ceramics with the double perovskite structure have been synthesized by solid-state route and by thermal decomposition of nitrate solution precursor. Both compounds possess interesting and unexpected emission properties in the visible and NIR regions, never reported before for this type of materials. These properties have been measured in different experimental conditions in order to characterize their nature. The literature information on tellurium containing luminescent materials is not rich and the data are somewhat contradictory: nevertheless, they agree in assigning the emission properties to Te⁴⁺ in octahedral coordination, whereas the Te⁶⁺ ion is considered not luminescent. The presence of Te⁴⁺ ions has then been verified by XPS measurements. On the basis of the experimental evidences, the visible luminescence has been assigned to a transition between the electronic levels of the Te⁴⁺ ion. The origin of the NIR emission appears more difficult to assess: among the explored hypotheses, the most convincing one, at the present level of the information, involves the possible interactions between the Te⁴⁺ and Te⁶⁺ ions with consequent formation of an optically active charge transfer state, as already observed for other ns²-type ions (Bi³⁺, Sb³⁺).</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000494/pdfft?md5=1101d43af504905d68adf91d6a193c0e&pid=1-s2.0-S2590147824000494-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141596724","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}

{"title":"New explanation for oxidation-induced Cr4+ formation in garnets","authors":"","doi":"10.1016/j.omx.2024.100342","DOIUrl":"10.1016/j.omx.2024.100342","url":null,"abstract":"<div><p>The demand for self-Q-switched lasers caused a growing interest in Cr⁴⁺:YAG materials. However, the main problem of Cr⁴⁺:YAG is an insufficient concentration of Cr⁴⁺ ions. This problem is complicated by the absence of the adequate model describing formation of Cr⁴⁺ ions. Analysis of the temperature dependence of Cr³⁺ luminescence in the Cr-doped YAG ceramics after different thermal treatments allows understanding the mechanism of Cr³⁺-Cr⁴⁺ valence transformation. Two types of Cr³⁺ centers with different spectroscopic properties were revealed in the Cr,Ca-doped YAG ceramics, namely, single Cr³⁺ ions, and Cr³⁺/ <span><math><mrow><mo>[</mo><mrow><msubsup><mtext>Ca</mtext><mi>C</mi><mo>′</mo></msubsup><mo>…</mo><msubsup><mi>V</mi><mi>O</mi><mo>·</mo></msubsup></mrow><mo>]</mo></mrow></math></span> couples. Using the obtained spectroscopic data, a model of formation of Cr⁴⁺ ions in YAG lattice was proposed.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000548/pdfft?md5=3c9a7ae63d7fa17074f627e252bf4efd&pid=1-s2.0-S2590147824000548-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141951374","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}

{"title":"Influence of swift heavy ions irradiation on optical and luminescence properties of Y3Al5O12 single crystals","authors":"","doi":"10.1016/j.omx.2024.100341","DOIUrl":"10.1016/j.omx.2024.100341","url":null,"abstract":"<div><p>Optical and luminescence properties of Y₃Al₅O₁₂ (YAG) single crystals preliminary irradiated by swift heavy ions were studied. Swift heavy Xe ions with fluences ranging from 6·10¹⁰ to 2·10¹² ions/cm² were utilized for the irradiation of nominally undoped YAG single crystals. A stable strong induced absorption observed in the 200–600 nm spectral range correlates with the irradiation fluence. It is suggested that several centers are responsible for this induced absorption in YAG single crystals and their possible origin (F-type centers) is proposed and discussed. The swift heavy ions irradiation strongly modifies the luminescence properties of YAG, namely, the excitonic emission at liquid helium temperature is drastically suppressed in heavily irradiated crystals.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000536/pdfft?md5=40d7203da9ddb58508b48342cff27d3c&pid=1-s2.0-S2590147824000536-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141622198","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}

{"title":"Luminescence properties of Tb3+-activated K2O–La2O3–Ga2O3 glasses","authors":"","doi":"10.1016/j.omx.2024.100344","DOIUrl":"10.1016/j.omx.2024.100344","url":null,"abstract":"<div><p>Photoluminescence, scintillation, and thermoluminescence characteristics of the Tb³⁺-activated gallate glasses (20K₂O–(11-x/2)La₂O₃–69Ga₂O₃–x/2Tb₄O₇, x = 0.1–1.0) were investigated. The Tb³⁺-activated gallate glasses exhibited photoluminescence with some peaks at approximately 490, 540, 595, and 625 nm that were attributable to the 4f→4f transition of Tb³⁺. These peaks also appeared under X-ray radiation, and the x = 1.0 gallate glass showed the highest intensity. Moreover, a broad thermoluminescence glow peak appeared at 90 °C, and the thermoluminescence peak intensity decreased with increasing the Tb concentration. A complimentary relation between the scintillation and thermoluminescence intensity was observed.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000561/pdfft?md5=3f9c180a8e48e9bd872da6d395d19f60&pid=1-s2.0-S2590147824000561-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141848459","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}

{"title":"Preface: Phosphor materials for solid state lighting","authors":"","doi":"10.1016/j.omx.2024.100326","DOIUrl":"10.1016/j.omx.2024.100326","url":null,"abstract":"","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S259014782400038X/pdfft?md5=02b29b09fee12a3f3df5e92de024991a&pid=1-s2.0-S259014782400038X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141051031","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}

{"title":"The effect of the outer-sphere cations on the photophysical and magnetic properties of rare earth complexes with 2,2,2-trichloro-N-(diphenylphosphoryl)acetamide","authors":"Łukasz Michnik ,&nbsp;Albano N. Carneiro Neto ,&nbsp;Viktor A. Trush ,&nbsp;Maria Korabik ,&nbsp;Oscar L. Malta ,&nbsp;Volodymyr M. Amirkhanov ,&nbsp;Paula Gawryszewska","doi":"10.1016/j.omx.2024.100332","DOIUrl":"https://doi.org/10.1016/j.omx.2024.100332","url":null,"abstract":"<div><p>Two series of rare earth coordination compounds have been synthesized (<strong>Na[RE(L</strong>_{<strong>4</strong>}<strong>)]</strong> (labeled as <strong>1RE</strong>) and <strong>PPh</strong>_{<strong>4</strong>}<strong>[RE(L</strong>_{<strong>4</strong>}<strong>)]</strong> (labeled as <strong>2RE)</strong><strong>,</strong> where RE = Y³⁺, Eu³⁺, Tb³⁺, L = 2,2,2-trichloro-N-(diphenylphosphoryl)acetamide) to determine the possibility of modifying their photophysical and magnetical properties by changing the counterion. The crystal structure of <strong>1RE</strong> was determined based on the single-crystal X-ray diffraction and the crystal structure of <strong>2RE</strong> was determined based on quantum chemistry computational procedures. Characterization of the physicochemical properties of the compounds was carried out using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), ¹H and ³¹P NMR spectroscopy as well as FT-IR, absorption and luminescence spectroscopy in the temperature range of 300 - 77 K. The rate constants of radiative (A_rad) and non-radiative (A_nrad) transitions, intrinsic (<span><math><mrow><msubsup><mi>Q</mi><mi>Ln</mi><mi>Ln</mi></msubsup></mrow></math></span>) and overall (<span><math><msubsup><mi>Q</mi><mrow><mi>L</mi><mi>n</mi></mrow><mi>L</mi></msubsup></math></span>) emission quantum yields, sensitization efficiency (η_sens), the experimental and theoretical intensity parameters (Ω_λ), the forward (<span><math><mrow><msup><mi>W</mi><mi>S</mi></msup></mrow></math></span>, <span><math><mrow><msup><mi>W</mi><mi>T</mi></msup></mrow></math></span>) and backward (<span><math><mrow><msubsup><mi>W</mi><mi>b</mi><mi>S</mi></msubsup></mrow></math></span>, <span><math><mrow><msubsup><mi>W</mi><mi>b</mi><mi>T</mi></msubsup></mrow></math></span>) intramolecular energy transfer (IET) rates were determined. Magnetic properties of Tb³⁺ compounds were studied in a constant field of 0.5 T in the temperature range of 1.8–300 K. Dynamic AC magnetic susceptibility measurements were carried out as a function of temperature and frequency for <strong>1</strong><strong>Tb</strong> and <strong>2</strong><strong>Tb</strong>. Only in the case of <strong>2</strong><strong>Tb</strong>, in the presence of an external DC field, a slight temperature dependence of in-phase χ′ and out-of-phase χ'' susceptibility was recorded. Based on experimental and theoretical results, the significant effect of counterion on the photophysical and magnetic properties of RE chelates has been demonstrated and clarified, providing valuable guidance for the design of bifunctional electromagnetic radiation converters.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000445/pdfft?md5=e48cfced280f1e014d3b600574bb7afc&pid=1-s2.0-S2590147824000445-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141480962","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}

{"title":"Thermoluminescence studies of a Gothic church in Świebodzin from Silesia in Poland","authors":"Andrzej Legendziewicz ,&nbsp;Janina Legendziewicz","doi":"10.1016/j.omx.2024.100308","DOIUrl":"10.1016/j.omx.2024.100308","url":null,"abstract":"<div><p>The paper presents thermoluminescence (TL) studies that aim to establish the possibility of using such analysis to determine the date of the construction, transformation and/or rebuilding of a historical church. The determination of the age of building structures using the form of absolute dating that is now used by architects and archeologists is difficult and complex. A relatively large error of estimation can be observed in archeological studies. In the case of samples from the Middle Ages, such errors are not acceptable. The authors attempted to develop an alternative spectroscopic TL method for such studies, and proposed that the composition of bricks should be measured using X-ray diffraction, electron microscopy (EM) and TL spectra. The bricks for the testing were taken from internal walls and the walls in the attics of churches, i.e. from places built during the last stage of construction works. The TL measurements were made using x-ray and β source excitation within the temperature range of 25–500°C. Two different sizes of grains were studied: small (∼0.1 mm) and large (∼0.5 mm). A gothic church in Świebodzin from 1555, which has a well-known history of its construction, was selected for the investigations. Due to the fact that this church is 326 years younger than the two churches evaluated and described in [1], the composition of its bricks could be different. Therefore, the authors decided to compare the XRD data, EM results and TL spectra for bricks taken from all three churches. The intensities of the TL and the integrated TL intensities were determined. The measurement results are important for creating a relationship between the TL intensity and the date a building object was constructed. Moreover, thanks to this it was possible to verify the construction date of Saski Palace in Warsaw.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000202/pdfft?md5=9f31848effe6ede06519121ce5b3ca06&pid=1-s2.0-S2590147824000202-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141031197","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}

{"title":"Highly efficient In(I) doped Cs3Cu2I5 single crystals for light-emitting diodes and gamma spectroscopy applications","authors":"","doi":"10.1016/j.omx.2024.100335","DOIUrl":"10.1016/j.omx.2024.100335","url":null,"abstract":"<div><p>High-quality Cs₃Cu₂I₅:In single crystals with a 7 mm diameter were grown by using the vertical Bridgman method. These crystals have a high optical transmittance (&gt;75 %) and emit a bright red-orange light under both UV and X-ray irradiation. The Cs₃Cu₂I₅:In crystals can exhibit a high photoluminescence quantum efficiency (PLQY) of 79.5 %, thus we explored the potential applications for light-emitting diodes (LED). The fabricated LED demonstrated CIE color coordinates of (0.553, 0.431) with a color rendering index (Ra) of 77, making it suitable for supplementary light in plant growth. Moreover, we evaluated their gamma-ray spectroscopy capability by using an avalanche photodiode (APD) detector. Under ¹³⁷Cs gamma-ray irradiation, the gamma scintillation yield and energy resolution gradually degraded as the In concentration increased, which can be attributed to an enhanced afterglow after In doping.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000470/pdfft?md5=7269a507f016dfa0bc94a9d377e0ba88&pid=1-s2.0-S2590147824000470-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141704809","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}

{"title":"Advanced luminescence applications of 3d3 transition metal ions","authors":"","doi":"10.1016/j.omx.2024.100338","DOIUrl":"10.1016/j.omx.2024.100338","url":null,"abstract":"<div><p>Transition metal ions with a <em>3d</em>^<em>3</em> electronic configuration are among the most prevalent dopants in luminescent materials, favored for their distinctive energy level configurations and the ability to tailor their spectroscopic properties by modulating the crystal field strength. Despite a history of applications spanning over six decades, recent years have seen a surge in increasingly sophisticated and innovative applications that warrant particular attention. Consequently, this paper will provide a comprehensive overview of the potential uses of phosphors ion-doped with a <em>3d</em>^<em>3</em> electronic configuration in advanced applications including: laser, lighting, NIR vision, plant cultivation, temperature and pressure sensing, optical heating, fingerprint detection, optical power meters.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000500/pdfft?md5=7e886a1b8f2de28940b36c15c5a6cc10&pid=1-s2.0-S2590147824000500-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141637224","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}

{"title":"Influence of the 4f5d-1S0 energy gap on the decay times of Pr3+-doped fluoride scintillating glasses","authors":"","doi":"10.1016/j.omx.2024.100339","DOIUrl":"10.1016/j.omx.2024.100339","url":null,"abstract":"<div><p>A comparative analysis of praseodymium (Pr³⁺)-doped fluoride glasses, APLF [20Al(PO₃)₃–80LiF–PrF₃], BCAYF (19BaF₂–33.25CaF₂–42.75AlF₃–5YF₃–PrF₃), and BCAPLF (19BaF₂–33.25CaF₂–42.75AlF₃–15P₂O₅–20LiF–PrF₃), reveals the effect of the host matrix on the optical properties, particularly the luminescence behavior of Pr³⁺ ions. X-ray absorption near edge structure (XANES) spectroscopy verifies the presence of Pr ions in the glasses with a +3 oxidation state. Absorption spectra results suggest that the lowest energy level of the Pr³⁺ 4f5d configuration is influenced by the oxide/fluoride ratio of the glasses. As both interconfigurational 4f5d and intraconfigurational 4f² transitions are observed, the energy gap between the lowest level of the 4f5d configuration and the overlapping ¹S₀ level of the 4f² configuration is found to influence the predominance of UV emissions from the 4f5d and ¹S₀ levels as well as their decay times. Consequently, a larger 4f5d-¹S₀ energy gap of ∼5000 cm⁻¹ leads to a more intense UV emission from the 4f5d level with a faster decay time. These results underscore the significance of minimizing the energy of the 4f5d level and increasing the gap between 4f5d-¹S₀ levels to be able to obtain fast UV emissions from Pr³⁺-doped fluoride glasses.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000512/pdfft?md5=e789057e4582f402367fac2b60cdd2d1&pid=1-s2.0-S2590147824000512-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141691254","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}