U. Rogulis, A. Fedotovs, Dz Berzins, G. Krieke, L. Skuja, A. Antuzevics
{"title":"Low temperature recombination luminescence of Mg3Y2Ge3O12:Tb3+","authors":"U. Rogulis, A. Fedotovs, Dz Berzins, G. Krieke, L. Skuja, A. Antuzevics","doi":"10.1016/j.omx.2024.100368","DOIUrl":"10.1016/j.omx.2024.100368","url":null,"abstract":"<div><div>A study was conducted to examine the recombination processes in persistent phosphor Mg<sub>3</sub>Y<sub>2</sub>Ge<sub>3</sub>O<sub>12</sub>:Tb<sup>3+</sup> garnet at low temperatures. Photoluminescence (PL), recombination luminescence (RL), electron paramagnetic resonance (EPR), and EPR detected by PL or RL were measured.</div><div>In samples with low Tb<sup>3+</sup> concentration, a broad PL and RL band around 400–450 nm and characteristic Tb<sup>3+</sup> lines were observed. However, in samples with high Tb<sup>3+</sup> concentration, only Tb<sup>3+</sup> lines were present. Both the broad-band and the line components exhibit long-lasting tunneling luminescence with hyperbolic decay. After 263 nm UV irradiation signals of intrinsic electron (F-type) and hole (V-type) trapping centres were observed in the EPR spectra. Such signals were also observed in RL-detected EPR spectra, indicating that the broad RL band at low Tb<sup>3+</sup> concentrations originates from tunneling recombination between these intrinsic traps. At high Tb<sup>3+</sup> concentrations, the RL-EPR spectrum was not observed, suggesting that intrinsic electron and Tb-related hole trapping centres probably participate in the tunneling recombination.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100368"},"PeriodicalIF":0.0,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356636","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":"Latent fingerprint detection and identification using yellow-emitting YOF:Pr3+ nanophosphor","authors":"Sumedha Tamboli , Govind B. Nair , S.J. Dhoble , H.C. Swart","doi":"10.1016/j.omx.2024.100364","DOIUrl":"10.1016/j.omx.2024.100364","url":null,"abstract":"<div><div>In this study, YOF:Pr<sup>3+</sup> nanophosphors were synthesized using the microwave-assisted hydrothermal route. The structural and morphological properties of the nanophosphors calcined at different temperatures were studied in detail to optimize the synthesis conditions. The visible region and near-infrared (NIR) photoluminescence (PL) properties of the nanophosphors were obtained. Intense emission bands were observed in the blue and red regions under 250 nm excitation. The CIE chromaticity diagram showed that the color coordinates of the nanophosphors were located in the yellow region. The optimum Pr<sup>3+</sup>-concentration was found to be 0.002 mol fraction. The application of YOF: 0.002 Pr<sup>3+</sup> nanophosphor for latent fingerprint detection was examined and evaluated on different types of surfaces. The nanophosphor demonstrated excellent adherence to the ridge patterns and sufficient sensitivity required for distinguishing between the ridges and the furrows. Different levels of detail were also observed that provided necessary information for the individualization of the fingerprints. The results suggest that the prepared YOF:Pr<sup>3+</sup> nanophosphor can be a potential candidate for the rapid visualization and detection of latent fingerprints.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100364"},"PeriodicalIF":0.0,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142326520","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":"Threshold phenomena in photoluminescence of upconversion micro- and nanophosphors containing Er3+ and Yb3+ ions","authors":"M.G. Zuev , V.G. Il'ves , S.Yu. Sokovnin , A.A. Vasin , E.Yu. Zhuravleva","doi":"10.1016/j.omx.2024.100363","DOIUrl":"10.1016/j.omx.2024.100363","url":null,"abstract":"<div><div>During electron beam evaporation of green-emitting (λ<sub>ex</sub> = 980 nm) silicate upconversion (UC-PL) bulk phosphors Sr<sub>2</sub>Y<sub>6.8</sub>YbEr<sub>0.2</sub>Si<sub>6</sub>O<sub>26</sub>, amorphous nanoparticles of size 2.7 nm are formed. The nanoparticles are globules formed during condensation of chains consisting of SiO<sub>4</sub> tetrahedra. When the globules are excited with radiation of λ<sub>ex</sub> = 980 nm, the luminescence color becomes red and its intensity increases 80 times compared with bulk phosphors. It has been shown that luminescence is influenced by nonradiative processes between different transitions of Er<sup>3+</sup> ions. There is a threshold population of the Er<sup>3+</sup> and Yb<sup>3+</sup> levels (level <sup>2</sup><em>F</em><sub>5/2</sub>) in the region of relatively low pumping powers. Above this threshold, a sharp increase in the intensity of upconversion photoluminescence occurs. We show that the produced nanophosphors have a core consisting of a combination of SiO tetrahedra (n = 0, 1, 2), while Er, Yb, Sr, and Y ions are on the surface of the globules. Owing to this structure of the globules, the interaction of Er and Yb ions with nucleus defects, which usually suppress the luminescence, decreases. Probably, for this reason the luminescence intensity increases. Our findings reveal that new effective non-linear materials can be designed for converting IR radiation into visible radiation. The produced effective phosphors can hold promise as fluorescent probes in bioresearch, for fundamental therapy, as well as for new display technologies.</div></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100363"},"PeriodicalIF":0.0,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356635","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}
Lucas P. Fonseca , Natália C. Oliveira , Lucas M. Martins , Luis V.A. Scalvi
{"title":"Thin film deposition of organic-inorganic quinoline-tin dioxide p-n junction for optoelectronic devices","authors":"Lucas P. Fonseca , Natália C. Oliveira , Lucas M. Martins , Luis V.A. Scalvi","doi":"10.1016/j.omx.2024.100361","DOIUrl":"10.1016/j.omx.2024.100361","url":null,"abstract":"<div><p>Tin dioxide (SnO<sub>2</sub>) is an oxide semiconductor with n-type characteristics, with high transparency in the UV–Vis, where the donors are usually associated with oxygen vacancies and interstitial tin ions. Quinoline derivatives (QD) are usually p-type semiconductors with emission in the blue range. We report photo-induced properties of the QD <em>4-(6-(diethylamino)-4-phenylquinolin-</em>2-yl<em>)benzoic acid</em> and the combination with the inorganic semiconductor oxide SnO<sub>2</sub>, both layers in the form of thin film, which forms a heterostructure. Thin film is a very convenient format for integration in optoelectronics. Emission of the QD takes place in blue range (470–485 nm) and depends on the solvent when in solution, being used acetone and tetrahydrofuran (THF). However, when in the form of thin film, it does not depend on the solvent. Concerning the heterostructure, it is explored under distinct device architecture: 1) combination in a transport profile perpendicular to the films (transverse contacts) leading to a rectifying behavior similar to a <em>p-n</em> junction, which is evidence of the p-type-like electrical behavior of the QD; 2) in parallel conduction profile, where there seems to exist some sort of interfacial phenomenon similar to a two-dimensional electron gas (2-DEG), a property that can be explored in transparent high-mobility transistors.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100361"},"PeriodicalIF":0.0,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000731/pdfft?md5=31dcfd348578e4c0a89e8caf8245840f&pid=1-s2.0-S2590147824000731-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274561","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}
Matthias Balthasar Kesting , Jörg Meyer , Gunnar Seide
{"title":"Assessment of polylactide as optical material","authors":"Matthias Balthasar Kesting , Jörg Meyer , Gunnar Seide","doi":"10.1016/j.omx.2024.100360","DOIUrl":"10.1016/j.omx.2024.100360","url":null,"abstract":"<div><p>Due to growing concerns considering environmental pollution, interest in bioplastics is rising. For technical applications, the respective materials have to meet high requirements. In optical applications these include transmittance, refractive index and dispersion but also dimensional stability, resistance against thermal influences and radiation induced degradation. Polylactide (PLA), a bio-based and biodegradable polymer, is already applied in high tech applications such as bioresorbable implants. The material shows favorable optical properties in its glassy state and excellent resistance against photodegradation. However, the application of PLA is hindered by its crystallization behavior. When exposed to temperatures above 55–60 °C it turns hazy. This might be avoided by hindering crystallization or tailoring crystal morphology. In this critical review, current applications of PLA are discussed and its broad use is shown. A literature search is carried out considering fully bio-based and biodegradable plastics for optical applications. The results show that currently no material is commercially available that meets all requirements set. Finally, an overview of the current state in research is provided, considering PLA-based materials with adapted crystallization behavior under the aspect of transparency. This includes use of additives, formulation of blends and material treatments. Finally, recommendations for the goal of achieving highly sustainable PLA-based optical components are given.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100360"},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S259014782400072X/pdfft?md5=564c289071e8260d58e93b008bfb9d6c&pid=1-s2.0-S259014782400072X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274559","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}
Nikifor Rakov , Francisco Matias , Yutao Xing , Glauco S. Maciel
{"title":"Mn2+ doped Zn2SiO4 phosphors: A threefold-mode sensing approach for optical thermometry in the visible region at 525 nm","authors":"Nikifor Rakov , Francisco Matias , Yutao Xing , Glauco S. Maciel","doi":"10.1016/j.omx.2024.100359","DOIUrl":"10.1016/j.omx.2024.100359","url":null,"abstract":"<div><p>Optical functional materials such as nanostructured silicates have been studied for photonics applications involving energy conversion. In this scenario, we studied Zn<sub>2</sub>SiO<sub>4</sub>:Mn<sup>2+</sup> nanostructured powders prepared by combustion synthesis for optical thermometry based on photon downshifting. The structural analysis showed that Zn<sub>2</sub>SiO<sub>4</sub> particles were found embedded in clustered silica nanoparticles. The photoluminescence analysis showed that the samples exhibit intense green emission (centered around 525 nm), corresponding to the electronic transition <sup>4</sup>T<sub>1</sub> → <sup>6</sup>A<sub>1</sub> of Mn<sup>2+</sup>, when exposed to a low power ultraviolet lamp (centered around 255 nm). The temperature sensing performance of this material was evaluated using three different methodologies, i.e. the luminescence decay time constant, the spectral full width at half maximum, and the luminescence peak intensity from the <sup>4</sup>T<sub>1</sub> → <sup>6</sup>A<sub>1</sub> radiative transition. The thermometric analysis based on luminescence peak intensity provided a maximum relative sensitivity of ∼4.9x10<sup>−3</sup> K<sup>−1</sup> at 498 K, while the decay lifetime and the spectral width at half maximum provided maximum relative temperature sensitivities of ∼2.9x10<sup>−3</sup> K<sup>−1</sup> at 523 K and ∼1.7x10<sup>−3</sup> K<sup>−1</sup> at 298 K, respectively.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100359"},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000718/pdfft?md5=02e3cd9e5163c2fbde5ab8025099e08c&pid=1-s2.0-S2590147824000718-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238228","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":"Upconversion luminescence of pyrochlore structured (A2B2O7) phosphors","authors":"B.V. Naveen Kumar , H.C. Swart , R.E. Kroon","doi":"10.1016/j.omx.2024.100355","DOIUrl":"10.1016/j.omx.2024.100355","url":null,"abstract":"<div><p>The pyrochlore-structured (A<sub>2</sub>B<sub>2</sub>O<sub>7</sub>) compounds have emerged as a focal point in contemporary research and materials science, captivating attention for their intriguing properties such as photoluminescence, superconductivity, ionic mobility, and potential applications in high-temperature barrier coatings. Their potential application in up- or down-conversion photoluminescence further positions them for integration into a myriad of optoelectronic and sensing devices. Building on extensive prior research, this review delves into the upconversion (UC) luminescence properties of numerous pyrochlore-structured host materials (titanates, zirconates, hafnates, and ytterbium pyrochlores), specifically those doped with rare earth ions. While these materials may share similar chemical and structural characteristics, their luminescent capabilities exhibit significant variation upon rare earth ion doping. The phase transitions of various pyrochlore-structured compounds with respect to cation ratio, the relationship between crystal structure, doping concentrations, and UC luminescent properties in pyrochlore-structured compounds are summarized in detail. Through controlled doping strategies and structural adjustments, researchers have been able to tailor the luminescence properties of pyrochlore structured compounds to meet specific application requirements. The intricate exploration of the UC luminescence properties of pyrochlore-structured compounds, especially when doped with rare earth ions, showcases the rich potential for these materials in a wide array of applications across various fields, from advanced sensing technologies to innovative optoelectronic devices, paving the way for exciting advancements in materials science and beyond.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100355"},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000676/pdfft?md5=d306776b4ced6aa08042b9934bfcaf1f&pid=1-s2.0-S2590147824000676-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238227","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":"Investigation of the optical and electrical properties of zinc oxide by terahertz time domain ellipsometry","authors":"Zixi Zhao , Verdad C. Agulto , Toshiyuki Iwamoto , Kosaku Kato , Kohei Yamanoi , Toshihiko Shimizu , Nobuhiko Sarukura , Takashi Fujii , Tsuguo Fukuda , Masashi Yoshimura , Makoto Nakajima","doi":"10.1016/j.omx.2024.100352","DOIUrl":"10.1016/j.omx.2024.100352","url":null,"abstract":"<div><p>In order to demonstrate the application of terahertz time-domain ellipsometry (THz-TDE) in the characterization of wide-bandgap semiconductors, we studied two zinc oxide (ZnO) single crystals with different conductivities. The optical properties of ZnO samples with low conductivity and high conductivity are both obtained by ellipsometric parameters, while the electrical properties of ZnO sample with high conductivity are well deduced and fitted using the Drude model. These results suggest that THz-TDE can effectively obtain the optical and electrical properties of wide-gap semiconductors and can be used to characterize semiconductors with carrier densities higher than 10<sup>16</sup> cm<sup>−3</sup>.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100352"},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000640/pdfft?md5=09b00669cf8f0ea510165357d2007a82&pid=1-s2.0-S2590147824000640-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142233736","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":"A review of the optically and thermally stimulated luminescence properties of aluminosilicates","authors":"S.W.S. McKeever","doi":"10.1016/j.omx.2024.100351","DOIUrl":"10.1016/j.omx.2024.100351","url":null,"abstract":"<div><p>This paper reviews the main literature describing models for thermoluminescence (TL), optically stimulated luminescence (OSL) and radiophotoluminescence (RPL) in aluminosilicate materials, namely natural feldspar minerals and synthetic glasses. The work examines the different models proposed to explain the various luminescence phenomena and compares them with each other. The models include thermally and optically stimulated excited-state tunneling, band-tail state hopping, and ionization and transportation through the band-tail states and/or the conduction band. Temperature and stimulation wavelength are critical parameters, with one model or another dominating over different temperature and/or wavelength ranges. Some recommendations for future research are noted.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100351"},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000639/pdfft?md5=fe9b6868c2ee8a998ceeae8d203f0656&pid=1-s2.0-S2590147824000639-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274560","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":"Electrophysical and thermoelectric properties and crystal structure of the formed Mn4Si7 thin vacuum coatings","authors":"B.D. Igamov , G.T. Imanova , V.V. Loboda , V.V. Zhurikhina , I.R. Bekpulatov , A.I. Kamardin","doi":"10.1016/j.omx.2024.100353","DOIUrl":"10.1016/j.omx.2024.100353","url":null,"abstract":"<div><p>The necessary information on the formation of high manganese silicide (Mn<sub>4</sub>Si<sub>7</sub>) coating by magnetron sputtering method is presented in this work. The technology and basic modes of creating the necessary targets for a magnetron sputtering device are presented. Targets were created by adding silicon and manganese powders in the required amount and heating them under vacuum conditions at high temperature and pressure. Thin silicide films (thin coatings) of different thicknesses were formed on the surface of silicon dioxide from the produced targets using the method of magnetron sputtering. The electrophysical and thermoelectric properties of the produced films were studied using physical and optical methods.Due to the change in the structure of the coatings during subsequent heat treatment, the Seebeck coefficient noticeably increases.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"24 ","pages":"Article 100353"},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000652/pdfft?md5=50167fddcdae7748b468112f17ea05c0&pid=1-s2.0-S2590147824000652-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229230","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}