Optical Materials: X最新文献_第10页

From synthesis to fabrication: Engineering thin translucent films with green persistent luminescent nanoparticles 从合成到制造:工程半透明薄膜与绿色持久发光纳米粒子

Optical Materials: X Pub Date : 2023-09-27 DOI: 10.1016/j.omx.2023.100271

Douglas L. Fritzen , Gabriel Nardy , Marcelo C. Portes , Luidgi Giordano , Everton Bonturim , Verônica C. Teixeira , Lucas C.V. Rodrigues

{"title":"From synthesis to fabrication: Engineering thin translucent films with green persistent luminescent nanoparticles","authors":"Douglas L. Fritzen , Gabriel Nardy , Marcelo C. Portes , Luidgi Giordano , Everton Bonturim , Verônica C. Teixeira , Lucas C.V. Rodrigues","doi":"10.1016/j.omx.2023.100271","DOIUrl":"https://doi.org/10.1016/j.omx.2023.100271","url":null,"abstract":"<div>Green-emitting ZnGa2O4:Mn2+ persistent luminescent nanoparticles were synthesized via a solvothermal method followed by a microwave-assisted sintering at 1150 °C. The obtained cubic-like particles averaged 62 ± 16 nm by Transmission Electron Microscopy (TEM) and presented afterglow for up to 2 h after a 5 min excitation in the UV. By Electron Paramagnetic Resonance (EPR), it was observed that the Mn2+ dopant replaces uniquely Zn2+ sites during synthesis. The obtained particles were dispersed with hydroxypropyl methylcellulose (HPMC) in water to create thin films by drop-casting. The films with different concentrations of nanoparticles (1 g/m2, 10 g/m2 and 100 g/m2) had average visible transmittances between 20% and 24%, and presented persistent luminescence after UV excitation, with longer duration by increasing nanoparticle concentration. By synchrotron X-ray Fluorescence (XRF) nanomapping of these films it is possible to see clusters of up to 6 μm of the nanoparticles in the film due to water pockets during film-casting. The X-ray Excited Optical Luminescence (XEOL) showed only Mn2+ emission and the XEOL-XRF mapping proved the integrity of the nanoparticles after film fabrication. By combining the solvothermal method, microwave-assisted sintering, and drop casting, this study establishes a promising pathway for the development of advanced flexible and translucent persistent luminescent composites.</div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49739004","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: 1

(INVITED) Flexible photonics for biomedical applications: A review (特邀)柔性光子学在生物医学中的应用:综述

Optical Materials: X Pub Date : 2023-09-16 DOI: 10.1016/j.omx.2023.100265

Riccardo Ballarini, Stefano Taccheo

引用次数: 0

Crystal structure and thermally enhanced photoluminescence in Eu(III) coordination polymers self-assembled from p-nitrobenzoic acid 对硝基苯甲酸自组装Eu(III)配位聚合物的晶体结构和热增强光致发光

Optical Materials: X Pub Date : 2023-09-11 DOI: 10.1016/j.omx.2023.100266

Shuping Ji , Yu Dong , Puyan Hao, Mengzhen Jia, Rui Zhu, Yiming Zhang, Xiaoqi Zhao, Lei Zhao

{"title":"Crystal structure and thermally enhanced photoluminescence in Eu(III) coordination polymers self-assembled from p-nitrobenzoic acid","authors":"Shuping Ji , Yu Dong , Puyan Hao, Mengzhen Jia, Rui Zhu, Yiming Zhang, Xiaoqi Zhao, Lei Zhao","doi":"10.1016/j.omx.2023.100266","DOIUrl":"https://doi.org/10.1016/j.omx.2023.100266","url":null,"abstract":"<div>Luminescent thermal quenching is a very troublesome thing for the practical application of luminescent materials, but also is a very common phenomenon. In theory, artificially reducing the number of quenching group around the luminescent lanthanide ion can effectively enhance the luminescence of lanthanide luminescent materials. In this paper, {[Eu2(NBA)6(H2O)4]∙H2O}n [Eu-NBA, NBA = p-nitrobenzoic acid] coordination polymers containing abundant coordination and interstitial water molecules were synthesized via hydrothermal methods. The chemical composition, crystal structures, and thermal stability of Eu-NBA coordination polymers were systemically investigated by Frontier-transfer infrared (FTIR) spectra, single-crystal X-ray diffraction and thermogravimetric analysis. X-ray diffraction analysis results revealed that Eu-NBA coordination polymers were crystallized into one-dimensional (1D) chain structures, where the adjacent Eu3+ ions were linked together by bidentate and/or tetradentate bridging carboxylate groups of the NBA ligands. The temperature-dependent photoluminescence spectra revealed that the shape and intensity of the luminescence spectra strongly depended on the coordination environment around Eu3+, and significant luminescent thermal enhancement was observed. These experimental results provided useful theoretical support for further understanding of the luminescence enhancement mechanism of lanthanide coordination polymers.</div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49719509","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

Combined density functional theory and boundary element methods study on optical and electronic properties of interfacial Au/TiO2 defects 结合密度泛函理论和边界元方法研究Au/TiO2界面缺陷的光学和电子性质

Optical Materials: X Pub Date : 2023-09-11 DOI: 10.1016/j.omx.2023.100267

Diem Thi-Xuan Dang , Nam Hoang Vu , Thu Thi-Hanh Vu , Nam Thoai , Yoshiyuki Kawazoe , Bach Thang Phan , Duc Nguyen-Manh

{"title":"Combined density functional theory and boundary element methods study on optical and electronic properties of interfacial Au/TiO2 defects","authors":"Diem Thi-Xuan Dang , Nam Hoang Vu , Thu Thi-Hanh Vu , Nam Thoai , Yoshiyuki Kawazoe , Bach Thang Phan , Duc Nguyen-Manh","doi":"10.1016/j.omx.2023.100267","DOIUrl":"https://doi.org/10.1016/j.omx.2023.100267","url":null,"abstract":"<div>This study investigates the optical and electrical properties of Au/TiO2 nanoparticles with different sizes and defects by combining micro- and macro-scale simulations through density functional theory (DFT) and boundary element method (BEM), respectively. The O-vacancy in the sample enhances the bonding and the electron transfer at the Au/TiO2 perimeter zone, as indicated by the binding energy and charge density difference in DFT calculations, respectively. BEM simulation indicates a stronger electromagnetic field in the Au/TiO2 interface of the sample with O-vacancy. DFT calculations demonstrate that the optical absorption of Au/TiO2 in the ultraviolet range is well described by the absorption coefficient spectra, whereas the BEM results well describe the range of the surface plasmon resonance absorption of Au/TiO2 in the wavelength range of 480–550 nm through the absorption cross-section. This study demonstrates the combined role of DFT and BEM in studying the electrical and optical properties of the nanocrystal system.</div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49719506","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

Effect of adding Er3+ on the precipitated crystalline phase of SrF2–ZnO–B2O3 glass and upconversion luminescence Er3+对SrF2-ZnO-B2O3玻璃析出晶相及上转换发光的影响

Optical Materials: X Pub Date : 2023-09-09 DOI: 10.1016/j.omx.2023.100268

Ryo Tanaka , Yuuki Kitagawa , Kenji Shinozaki

{"title":"Effect of adding Er3+ on the precipitated crystalline phase of SrF2–ZnO–B2O3 glass and upconversion luminescence","authors":"Ryo Tanaka , Yuuki Kitagawa , Kenji Shinozaki","doi":"10.1016/j.omx.2023.100268","DOIUrl":"https://doi.org/10.1016/j.omx.2023.100268","url":null,"abstract":"<div>Elucidating the relationship between nucleation and its structure in glasses is essential for the efficient development of new glass-ceramics. In this study, we developed new oxyfluoride nanocrystallized glass-ceramics with potential for upconversion luminescence, phosphor for LEDs, and fiber laser hosts. We investigated the glass-forming region in the SrF2–ZnO–B2O3 system and the crystallization behavior, glass structure, and optical properties of the xSrF2–(50−x)ZnO–50B2O3 system with the lowest quantity of glass-forming oxides. Whereas both the x = 10 and x = 20 samples precipitated more than 100 nm diameter of Zn4B6O13 by heat treatment, the Er3+-doped samples with x = 10 and x = 20 precipitated SrF2 nanocrystals of less than 20 nm. The resulting SrF2 nanocrystallized glass was transparent, and upconversion luminescence was observed by irradiating with a 980-nm LD. We found that the addition of Er3+ ions has a significant impact on crystallization, and the proposed mechanism for this is that the bond selectivity arising from the polarizability forms fluoride-rich domains, and Er3+ further assists the nucleation of SrF2 by serving as a crystal nucleation site. This study is expected to provide a guideline for the development of new transparent nanocrystallized glasses.</div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49719512","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

Broad-range high-resolution optical spectroscopy of CH3NH3PbBr3 hybrid perovskite single crystals: Optical phonons, absorption edge, phase transitions CH3NH3PbBr3杂化钙钛矿单晶的宽范围高分辨率光谱学:光学声子、吸收边、相变

Optical Materials: X Pub Date : 2023-08-28 DOI: 10.1016/j.omx.2023.100259

Vasilisa E. Anikeeva , Kirill N. Boldyrev , Olga I. Semenova , Taisiya S. Sukhikh , Marina N. Popova

{"title":"Broad-range high-resolution optical spectroscopy of CH3NH3PbBr3 hybrid perovskite single crystals: Optical phonons, absorption edge, phase transitions","authors":"Vasilisa E. Anikeeva , Kirill N. Boldyrev , Olga I. Semenova , Taisiya S. Sukhikh , Marina N. Popova","doi":"10.1016/j.omx.2023.100259","DOIUrl":"10.1016/j.omx.2023.100259","url":null,"abstract":"<div>Vibrational and structural properties have an enormous influence on optoelectronic properties of hybrid halide perovskites CH3NH3PbX3 (X = I, Br, Cl), which are perspective materials for different photovoltaic applications. Here, we report results of the first high-resolution optical spectroscopy measurements of large CH3NH3PbBr3 single crystals in wide frequency (20–20 000 cm−1) and temperature (5–300 K) ranges. Fit of polarized far-infrared reflection spectra using Lorentz model of damped oscillators revealed parameters of three phonons at room temperature and 38 phonons at 10 K. An analysis of mid-infrared transmission spectra gave evidence of a strong anharmonicity in this hybrid perovskite. A splitting of some lines observed in the orthorhombic phase was presumably assigned to the tunneling of the CH3NH3+ cation molecule between several potential energy minima. The temperature behavior of the transmission spectra near the fundamental absorption edge was tentatively explained by the competition between two different exciton transitions in CH3NH3PbBr3. Positions of spectral lines and of the absorption edge measured at cooling and heating the sample demonstrate hysteresis loops in the vicinities of phase transitions around 237, 155, and 149 K, thus revealing the first-order nature of all three phase transitions in CH3NH3PbBr3.</div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48480296","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

Preparation and photoluminescence properties of high thermal stability Sr3Ga2Sn1.5Si2.5O14:Eu3+ red phosphors for high-power light-emitting diodes application 大功率发光二极管用高热稳定性Sr3Ga2Sn1.5Si2.5O14:Eu3+红色荧光粉的制备及其光致发光性能

Optical Materials: X Pub Date : 2023-08-24 DOI: 10.1016/j.omx.2023.100264

Huanyi Guo , Yuling Zheng , Tongna Shi , Zhiyu Qin , Guoying Zhao , Yufeng Liu , Ganghua Zhang , Dehua Wu , Langping Dong , Jingshan Hou , Yongzheng Fang

{"title":"Preparation and photoluminescence properties of high thermal stability Sr3Ga2Sn1.5Si2.5O14:Eu3+ red phosphors for high-power light-emitting diodes application","authors":"Huanyi Guo , Yuling Zheng , Tongna Shi , Zhiyu Qin , Guoying Zhao , Yufeng Liu , Ganghua Zhang , Dehua Wu , Langping Dong , Jingshan Hou , Yongzheng Fang","doi":"10.1016/j.omx.2023.100264","DOIUrl":"https://doi.org/10.1016/j.omx.2023.100264","url":null,"abstract":"<div>A series of Sr3Ga2Sn1·5Si2·5O14:xEu3+ (SGSSO:xEu3+) phosphors with excellent thermal stability were prepared by the solid-state reaction method. The phase and luminescence properties of the sample were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance spectroscopy, and photoluminescence (PL) spectra. Under the excitation of 395 nm, the SGSSO:Eu3+ phosphor exhibits strong red emission at 618 nm, which is attributed to the 5D0 → 7F2 transition of the Eu3+ ions. When monitoring the 618 nm emission peak, the excitation spectrum contains several excitation peaks with a maximum value of 395 nm, which is well matched with the commercial violet LED chips. In addition, the emission spectra of SGSSO:Eu3+ at different temperatures have also been studied. Pleasantly, the luminous intensity of the SGSSO:Eu3+ sample at 150 °C still maintains 80.2% of that at room temperature, demonstrating its good thermal stability and application potential in high-power LEDs. The mechanism for the high thermal stability of the as-prepared phosphor was also discussed. Moreover, the photoluminescence quantum yield of the optimized SGSSO:0.06Eu3+ phosphor can reach 62.7%. Finally, a warm white LED device with high color rendering index and low color temperature was prepared using the prepared SGSSO:Eu3+ phosphor as a red component, verifying the application potential of SGSSO:0.06Eu3+ in LEDs.</div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49735446","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: 1

(INVITED) smart and efficient multi-color tuning using fluoride upconversion nanoparticles blending (应邀)智能和高效的多色调谐使用氟化物上转换纳米粒子混合

Optical Materials: X Pub Date : 2023-08-23 DOI: 10.1016/j.omx.2023.100260

T.O. Sales, J.M. Chaves, C. Jacinto

{"title":"(INVITED) smart and efficient multi-color tuning using fluoride upconversion nanoparticles blending","authors":"T.O. Sales, J.M. Chaves, C. Jacinto","doi":"10.1016/j.omx.2023.100260","DOIUrl":"10.1016/j.omx.2023.100260","url":null,"abstract":"<div>Color tuning using upconversion nanoparticles (NPs) in the visible, in an attempt to obtain white light, has been achieved in several ways and has aroused much scientific and technological interest lately, due to its potential applications in color displays technology, assay of biological compounds, remote sensing, optical data storage and optical printing. In this work, we present a simple and smart way to obtain color tuning in practically all the chromaticity diagram. LaF3 and CaF2 NPs were used with different dopants. They were chosen because of their high resistance to optical damage, low phonon energy (<400 cm−1), chemical durability and thermal stability compared to other matrices, mainly various vitreous ones. Our method proved to be efficient, as the competition processes of energy transfer between the dopant ions have been a challenge to obtain an efficient color tuning and, mainly, to obtain pure white light. Our approach is based on mixing upconversion NPs powders of LaF3:Yb3+/Tm3+, LaF3:Yb3+/Ho3+ and CaF2:Yb3+/Er3+ in specific amounts. In all measurements, the Yb3+ ion was used as a sensitizer and the Tm3+, Ho3+ or Er3+ ions as activators to generate colors in the blue (Tm3+), green (Ho3+) and red (Er3+) regions, thus requiring a single excitation wavelength. Varying the amount of powder of each sample in the mixture, it was possible to observe a continuous tuning of colors in the CIE-1931 chromaticity diagram in a direct, efficient and cost-effective manner, which enables a range of application, mainly in multi-color luminescence and anticounterfeiting.</div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47194636","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

Luminescent properties of the Sr8−xBaxMgY(PO4)7:Eu2+ solid solution Sr8−xBaxMgY(PO4)7:Eu2+固溶体的发光性能

Optical Materials: X Pub Date : 2023-08-11 DOI: 10.1016/j.omx.2023.100257

Nakyung Lee , Małgorzata Sójka , Jakoah Brgoch

{"title":"Luminescent properties of the Sr8−xBaxMgY(PO4)7:Eu2+ solid solution","authors":"Nakyung Lee , Małgorzata Sójka , Jakoah Brgoch","doi":"10.1016/j.omx.2023.100257","DOIUrl":"https://doi.org/10.1016/j.omx.2023.100257","url":null,"abstract":"<div>Photoluminescence generated by substituting rare-earth ions on multiple crystallographically independent cation sites within a crystalline host material is one of the most common approaches for creating a full-spectrum phosphor-converted white light-emitting diode (pc-wLED). In this work, a series of complex orthophosphates with the composition (Sr8−xBax)0.99Eu0.08MgY(PO4)7 (x = 0, 1, 2, 3) were synthesized via high-temperature solid-state synthesis. These materials possess five potential substitution sites achieving broadband (5905 cm−1) yellow photoluminescence through multi-site substitution showing a violet-excited photoluminescent quantum yield of nearly 50%. Developing such an efficient broad emission spectrum is crucial for enhancing the color rendering ability of pc-wLEDs. Varying the Sr2+ to Ba2+ shifts the emission color from green-yellow to yellow under violet excitation (λex = 400 nm) while influencing the full-width-at-half-maximum (fwhm). Temperature-dependent photoluminescence measurements indicate that phosphor has good thermal stability with T50, the temperature at which the emission intensity is half of the low-temperature intensity, at 420 K and stable chromaticity coordinates, further supporting that the (Sr8−xBax)0.99Eu0.08MgY(PO4)7 series are promising candidates for LED white lighting. Constructing a prototype pc-wLEDs device using (Sr7Ba)0.99Eu0.08MgY(PO4)7, the highest quantum yield phosphor, produced a functional daylight bulb with a color rendering index (CRI) of 90.</div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49719335","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

Luminescent properties of the Sr8−Ba MgY(PO4)7:Eu2+ solid solution Sr8−Ba MgY(PO4)7:Eu2+固溶体的发光特性

Optical Materials: X Pub Date : 2023-08-01 DOI: 10.1016/j.omx.2023.100257

Nakyung Lee, M. Sójka, Jakoah Brgoch

引用次数: 0