Pub Date : 2024-09-22DOI: 10.1016/j.optmat.2024.116154
In addition to efficiency and lifetime, spectral stability, high color rendering index (CRI), and the Commission Internationale de l’Eclairag (CIE) coordinate close to the equi-energy white point (0.33, 0.33) are also important parameters for the development of white organic light emitting diodes (WOLEDs). However, how to realize these advantages at the same time is a challenge. In this paper, a series of white devices based on complementary color full thermally activated delayed fluorescence (full-TADF) emitters were fabricated with the aim to obtain WOLEDs with high color rendering index and CIE coordinate near the equi-energy white point. Through optimizing the doping concentration of the emitters, adding a supplementary emission layer, modifying the thickness of the main emission layer and the supplementary emission layer, the best device displays the CIE coordinates of (0.34, 0.35) and the CRI of 86, exhibiting good white emission. The results in this paper may provide a feasible method for realizing complementary color full-TADF WOLEDs with pure white emission.
{"title":"Pure white emission full thermally activated delayed fluorescence organic light emitting diode with a supplementary emission layer","authors":"","doi":"10.1016/j.optmat.2024.116154","DOIUrl":"10.1016/j.optmat.2024.116154","url":null,"abstract":"<div><div>In addition to efficiency and lifetime, spectral stability, high color rendering index (CRI), and the Commission Internationale de l’Eclairag (CIE) coordinate close to the equi-energy white point (0.33, 0.33) are also important parameters for the development of white organic light emitting diodes (WOLEDs). However, how to realize these advantages at the same time is a challenge. In this paper, a series of white devices based on complementary color full thermally activated delayed fluorescence (full-TADF) emitters were fabricated with the aim to obtain WOLEDs with high color rendering index and CIE coordinate near the equi-energy white point. Through optimizing the doping concentration of the emitters, adding a supplementary emission layer, modifying the thickness of the main emission layer and the supplementary emission layer, the best device displays the CIE coordinates of (0.34, 0.35) and the CRI of 86, exhibiting good white emission. The results in this paper may provide a feasible method for realizing complementary color full-TADF WOLEDs with pure white emission.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-21DOI: 10.1016/j.optmat.2024.116143
Nickel compounds nanoparticles have great potential for optoelectronic devices. In this study, we investigate the structural, morphological, optical, and electrical properties of (PET/ITO/NiO/Ag) and (PET/ITO/β-Ni(OH)2/Ag) heterojunction obtained by chemical bath deposition and spin coating, which are low-cost techniques. The crystal size was obtained by XRD diffraction; the structural analysis showed crystal dimensions in the 2–7 nm intervals. An enhanced conductivity of 0.86 (Ω/cm) and an increment in the lifetime carriers compared with samples without annealing treatment were observed. The I–V characteristics measured at room temperature, the height of the Schottky barriers, were estimated in the range of 0.56–0.60 eV. This method leads to an affordable application in optoelectronic devices.
{"title":"Effect of annealing on optoelectronic properties of β-Ni(OH)2 nanoparticles for flexible heterojunction","authors":"","doi":"10.1016/j.optmat.2024.116143","DOIUrl":"10.1016/j.optmat.2024.116143","url":null,"abstract":"<div><div>Nickel compounds nanoparticles have great potential for optoelectronic devices. In this study, we investigate the structural, morphological, optical, and electrical properties of (PET/ITO/NiO/Ag) and (PET/ITO/<strong><em>β</em></strong>-Ni(OH)<strong>2</strong>/Ag) heterojunction obtained by chemical bath deposition and spin coating, which are low-cost techniques. The crystal size was obtained by XRD diffraction; the structural analysis showed crystal dimensions in the 2–7 nm intervals. An enhanced conductivity of 0.86 (<strong>Ω</strong>/cm) and an increment in the lifetime carriers compared with samples without annealing treatment were observed. The I–V characteristics measured at room temperature, the height of the Schottky barriers, were estimated in the range of 0.56–0.60 eV. This method leads to an affordable application in optoelectronic devices.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-21DOI: 10.1016/j.optmat.2024.116151
The impact of substitution of B2O3/Co3O4 in borosilicate glasses on their optical, structural, and physical characteristics as well as their ability to attenuate γ-rays was examined. Using the traditional melt quenching process, glass samples with the chemical formula (45-X)B2O3+15SiO2+ 20BaF2+20Na2O + XCo3O4, where X equals 0.0, 0.5, 1.0, 1.5, and 2.0 mol%. The prepared samples were coded as Co-0.0 - Co-2.0. XRD measurements revealed the non-crystalline character of the Co-X samples. The molar volume (Vm) decreased from 31.19 cm3/mol to 31.08 cm3/mol, although the density (ρ) increased from 2.81 g/cm3 to 2.94 g/cm3. When comparing Co-0.0 and Co-2.0, the direct optical band gap () values reduced from 4.32 eV to 3.77 eV, while the indirect optical band gap () decreased from 3.93 eV to 3.44 eV. The Co-X glasses' Urbach's energy (EU) ranged from 0.297 eV to 0.248 eV. As the ratio of Co2+ ions rose, the optical dielectric constants of Co-X glasses, ε1 (actual part) and ε2 (imaginary portion) were improved. The linear (μ) and mass (μm) attenuation coefficients and effective atomic number (Zef) were followed the order: Co-2.0 > Co-1.5 > Co-1.0 > Co-0.5 > Co-0.0. The created Co-2.0 glass, which has the maximum amount of cobalt (III) oxide, has the lowest mean free path (MFP) and half/tenth value layers (H/TVL). The examined Co-X glasses can be employed for optical and γ-ray shielding purposes, as confirmed by the results.
{"title":"Impact of B2O3/Co3O4 substitution on structure, physical, optical characteristics and photon attenuation capacity of borosilicate glasses","authors":"","doi":"10.1016/j.optmat.2024.116151","DOIUrl":"10.1016/j.optmat.2024.116151","url":null,"abstract":"<div><div>The impact of substitution of B<sub>2</sub>O<sub>3</sub>/Co<sub>3</sub>O<sub>4</sub> in borosilicate glasses on their optical, structural, and physical characteristics as well as their ability to attenuate γ-rays was examined. Using the traditional melt quenching process, glass samples with the chemical formula (45-X)B<sub>2</sub>O<sub>3</sub>+15SiO<sub>2</sub>+ 20BaF<sub>2</sub>+20Na<sub>2</sub>O + XCo<sub>3</sub>O<sub>4</sub>, where X equals 0.0, 0.5, 1.0, 1.5, and 2.0 mol%. The prepared samples were coded as Co-0.0 - Co-2.0. XRD measurements revealed the non-crystalline character of the Co-X samples. The molar volume (V<sub>m</sub>) decreased from 31.19 cm<sup>3</sup>/mol to 31.08 cm<sup>3</sup>/mol, although the density (ρ) increased from 2.81 g/cm<sup>3</sup> to 2.94 g/cm<sup>3</sup>. When comparing Co-0.0 and Co-2.0, the direct optical band gap (<span><math><mrow><msubsup><mi>E</mi><mi>g</mi><mrow><mi>D</mi><mi>i</mi><mi>r</mi><mi>e</mi><mi>c</mi><mi>t</mi></mrow></msubsup></mrow></math></span>) values reduced from 4.32 eV to 3.77 eV, while the indirect optical band gap (<span><math><mrow><msubsup><mi>E</mi><mi>g</mi><mrow><mi>I</mi><mi>n</mi><mi>d</mi><mi>i</mi><mi>r</mi><mi>e</mi><mi>c</mi><mi>t</mi></mrow></msubsup></mrow></math></span>) decreased from 3.93 eV to 3.44 eV. The Co-X glasses' Urbach's energy (E<sub>U</sub>) ranged from 0.297 eV to 0.248 eV. As the ratio of Co<sup>2+</sup> ions rose, the optical dielectric constants of Co-X glasses, <em>ε</em><sub>1</sub> (actual part) and <em>ε</em><sub>2</sub> (imaginary portion) were improved. The linear (μ) and mass (μ<sub>m</sub>) attenuation coefficients and effective atomic number (Z<sub>ef</sub>) were followed the order: Co-2.0 > Co-1.5 > Co-1.0 > Co-0.5 > Co-0.0. The created Co-2.0 glass, which has the maximum amount of cobalt (III) oxide, has the lowest mean free path (M<sub>FP</sub>) and half/tenth value layers (H/T<sub>VL</sub>). The examined Co-X glasses can be employed for optical and γ-ray shielding purposes, as confirmed by the results.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142315201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-20DOI: 10.1016/j.optmat.2024.116148
The success of myoblasts transplantation for regeneration in ischemic heart disease is largely determined by their interactions with resident macrophages. Studying their complex, contradictory, and poorly understood interactions requires the development of effective and reliable approaches for labeling and tracking myoblasts. Here, we present a useful approach for studying myoblast migration into macrophage colonies using cell-internalizable thermally treated polyelectrolyte microcapsules containing Rhodamine B (average size is approximately 3.2 ± 0.8 μm). The presented capsules exhibited fluorescence photoconversion properties, allowing for individual fluorescence coding of myoblast cells based on the number of converted and unconverted microcapsules when several capsules were internalized simultaneously. More than 70 % of C2C12 cells internalized the capsules (74 % of which contained more than two). The metabolic activity did not decrease to below 80 %, and proliferation and mobility did not change significantly. The initial cell density during the incubation with the capsules had a significant effect on the uptake efficiency. We tracked the migration of individually labeled myoblasts and their daughter cells into a macrophage colony (Raw 264.7) over 96 h. The marked cells purposefully moved with other myoblasts towards the macrophage colony, while the macrophages did not shorten the distance, despite their ability to migrate. This proposed approach may provide valuable insights for future research into the role and interaction of macrophages and myoblasts in cardiac muscle repair and regeneration.
{"title":"Photoconvertible markers for study individual myoblast migration into the macrophage's colony","authors":"","doi":"10.1016/j.optmat.2024.116148","DOIUrl":"10.1016/j.optmat.2024.116148","url":null,"abstract":"<div><div>The success of myoblasts transplantation for regeneration in ischemic heart disease is largely determined by their interactions with resident macrophages. Studying their complex, contradictory, and poorly understood interactions requires the development of effective and reliable approaches for labeling and tracking myoblasts. Here, we present a useful approach for studying myoblast migration into macrophage colonies using cell-internalizable thermally treated polyelectrolyte microcapsules containing Rhodamine B (average size is approximately 3.2 ± 0.8 μm). The presented capsules exhibited fluorescence photoconversion properties, allowing for individual fluorescence coding of myoblast cells based on the number of converted and unconverted microcapsules when several capsules were internalized simultaneously. More than 70 % of C2C12 cells internalized the capsules (74 % of which contained more than two). The metabolic activity did not decrease to below 80 %, and proliferation and mobility did not change significantly. The initial cell density during the incubation with the capsules had a significant effect on the uptake efficiency. We tracked the migration of individually labeled myoblasts and their daughter cells into a macrophage colony (Raw 264.7) over 96 h. The marked cells purposefully moved with other myoblasts towards the macrophage colony, while the macrophages did not shorten the distance, despite their ability to migrate. This proposed approach may provide valuable insights for future research into the role and interaction of macrophages and myoblasts in cardiac muscle repair and regeneration.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1016/j.optmat.2024.116112
Single doped Mg0.388Al2O3.408O4 phosphor was prepared and multivalent Mn ion (Mn2+ and Mn4+) emission was achieved in a single host. The structure, morphology, and luminescence characteristics of Mn ions in Mg0.388Al2O3.408O4 were discussed in detail, especially the temperature dependent emission characteristics of Mn ions. Based on the fluorescence intensity ratio (FIR) of Mn2+versus Mn4+ and the decay lifetime of Mn4+ emission as the temperature readout, a dual-mode optical temperature-sensing mechanism was proposed and studied in the temperature range of 293–473 K. The maximum relative sensitivities (Sr) are derived as 2.83 % K−1 (at 373 K based on FIR) and 3.40 % K−1 (at 473 K based on decay lifetime), respectively. The temperature sensing characteristics of Mg0.388Al2.408O4: Mn2+/Mn4+ powders in a full fiber system were studied, which can provide thermal-sensitive emissions at dual-wavelengths for stable ratiometric temperature sensing with good precision and repeatability. The constructed all fiber temperature sensing system has been applied in the on-line monitoring of CPU temperature.
制备了单掺杂 Mg0.388Al2O3.408O4 荧光粉，并在单一宿主中实现了多价锰离子（Mn2+ 和 Mn4+）发射。详细讨论了 Mg0.388Al2O3.408O4 中锰离子的结构、形态和发光特性，尤其是锰离子随温度变化的发射特性。根据 Mn2+ 与 Mn4+ 的荧光强度比（FIR）和 Mn4+ 发射的衰减寿命作为温度读数，提出并研究了在 293-473 K 温度范围内的双模光学温度传感机制，得出最大相对灵敏度（Sr）分别为 2.83 % K-1（在 373 K 时基于 FIR）和 3.40 % K-1（在 473 K 时基于衰减寿命）。研究了 Mg0.388Al2.408O4：Mn2+/Mn4+ 粉末在全光纤系统中的温度传感特性，该系统可提供双波长热敏发射，用于稳定的比率温度传感，具有良好的精度和重复性。所构建的全光纤温度传感系统已应用于 CPU 温度的在线监测。
{"title":"Fiber temperature sensor based on dual-wavelength emitting Mg0.388Al2.408O4: Mn2+/Mn4+ phosphors for real-time temperature monitoring","authors":"","doi":"10.1016/j.optmat.2024.116112","DOIUrl":"10.1016/j.optmat.2024.116112","url":null,"abstract":"<div><div>Single doped Mg<sub>0.388</sub>Al<sub>2</sub>O<sub>3.408</sub>O<sub>4</sub> phosphor was prepared and multivalent Mn ion (Mn<sup>2+</sup> and Mn<sup>4+</sup>) emission was achieved in a single host. The structure, morphology, and luminescence characteristics of Mn ions in Mg<sub>0.388</sub>Al<sub>2</sub>O<sub>3.408</sub>O<sub>4</sub> were discussed in detail, especially the temperature dependent emission characteristics of Mn ions. Based on the fluorescence intensity ratio (FIR) of Mn<sup>2+</sup> <em>versus</em> Mn<sup>4+</sup> and the decay lifetime of Mn<sup>4+</sup> emission as the temperature readout, a dual-mode optical temperature-sensing mechanism was proposed and studied in the temperature range of 293–473 K. The maximum relative sensitivities (<em>S</em><sub>r</sub>) are derived as 2.83 % K<sup>−1</sup> (at 373 K based on FIR) and 3.40 % K<sup>−1</sup> (at 473 K based on decay lifetime), respectively. The temperature sensing characteristics of Mg<sub>0.388</sub>Al<sub>2.408</sub>O<sub>4</sub>: Mn<sup>2+</sup>/Mn<sup>4+</sup> powders in a full fiber system were studied, which can provide thermal-sensitive emissions at dual-wavelengths for stable ratiometric temperature sensing with good precision and repeatability. The constructed all fiber temperature sensing system has been applied in the on-line monitoring of CPU temperature.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142315203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1016/j.optmat.2024.116121
An organic metamaterial absorber (OMA) with a total thickness of 2.98 mm composed by multi-layer flexible frequency selective surface (FSS) and worked in ultra wideband (UWB) is investigated. The proposed absorber is stacked on a metal substrate by organic materials layer by layer, such as polyimide and polyvinyl chloride. According to equivalent circuit and electromagnetic field analysis, periodic FSS patterns are printed on organic materials using organic conductive ink. The absorption rate of the structure is high up to 90 % and the fractional bandwidth (FBW) reached 147.7 % at 11.78–78.32 GHz, which shows incident angle insensitive within 50°. In addition, the fabricated prototype with a single unit cell of 0.17 g is measured in an anechoic chamber using free space method. Furthermore, the measurement is in great agreement with the simulation, which demonstrates the reliability and the practical application prospect of the provided OMA with flexible, lightweight and ultrathin construction.
本文研究了一种由多层柔性频率选择表面（FSS）组成、总厚度为 2.98 毫米的有机超材料吸收器（OMA），该吸收器可用于超宽带（UWB）。所提出的吸收器由聚酰亚胺和聚氯乙烯等有机材料逐层堆叠在金属基板上。根据等效电路和电磁场分析，使用有机导电油墨在有机材料上印刷了周期性 FSS 图案。该结构的吸收率高达 90%，在 11.78-78.32 GHz 频率范围内的分数带宽（FBW）达到 147.7%，入射角在 50° 以内不敏感。此外，在电波暗室中使用自由空间法测量了单单元尺寸为 0.17 g 的原型。此外，测量结果与模拟结果非常吻合，这证明了所提供的具有灵活、轻质和超薄结构的 OMA 的可靠性和实际应用前景。
{"title":"Organic UWB metamaterial absorber with angle insensitive based on flexible frequency selective surface","authors":"","doi":"10.1016/j.optmat.2024.116121","DOIUrl":"10.1016/j.optmat.2024.116121","url":null,"abstract":"<div><div>An organic metamaterial absorber (OMA) with a total thickness of 2.98 mm composed by multi-layer flexible frequency selective surface (FSS) and worked in ultra wideband (UWB) is investigated. The proposed absorber is stacked on a metal substrate by organic materials layer by layer, such as polyimide and polyvinyl chloride. According to equivalent circuit and electromagnetic field analysis, periodic FSS patterns are printed on organic materials using organic conductive ink. The absorption rate of the structure is high up to 90 % and the fractional bandwidth (FBW) reached 147.7 % at 11.78–78.32 GHz, which shows incident angle insensitive within 50°. In addition, the fabricated prototype with a single unit cell of 0.17 g is measured in an anechoic chamber using free space method. Furthermore, the measurement is in great agreement with the simulation, which demonstrates the reliability and the practical application prospect of the provided OMA with flexible, lightweight and ultrathin construction.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1016/j.optmat.2024.116145
In this work, the Tb3+/Eu3+ co-doped 30SrO–10MgO–50SiO2–5TiO2–5B2O3–1Tb2O3-xEu2O3 (x = 0–2.5 mol% at 0.5 intervals) glasses were prepared by the melt-quenching method, and the single-phase Sr2MgSi2O7 glass-ceramics were obtained after heat treatment. The structural and fluorescence performance of the glasses and glass-ceramics were examined using DSC, XRD, SEM, FTIR, and photoluminescence spectra, and the energy transfer process between Tb3+ and Eu3+ was systematically investigated. With increasing Eu2O3 contents, the thermal stability of the glasses is enhanced and the density of both the glasses and the glass-ceramics rises. The XRD and SEM results reveal the precipitation of the irregular spherical Sr2MgSi2O7 microcrystals with a grain size roughly within 0.5–1 μm. Under 376 nm excitation, the overall emission intensity and lifetime of Eu3+ ions increase with increasing Eu2O3 contents, and the energy transfer efficiency reaches 58.74 % from 31.07 %. According to the Dexter model, the energy transfer process between the Tb3+ and Eu3+ is dominated by the quadrupole-quadrupole interactions. By varying the Eu2O3 contents, all the glass-ceramics exhibit higher color purity (82.06–96.27 %), and their chromaticity coordinates shift from yellowish green towards reddish orange, which is potentially promising for w-LEDs.
{"title":"Tunable emission and energy transfer of Tb3+/Eu3+ co-doped single-phase Sr2MgSi2O7 glass-ceramics","authors":"","doi":"10.1016/j.optmat.2024.116145","DOIUrl":"10.1016/j.optmat.2024.116145","url":null,"abstract":"<div><div>In this work, the Tb<sup>3+</sup>/Eu<sup>3+</sup> co-doped 30SrO–10MgO–50SiO<sub>2</sub>–5TiO<sub>2</sub>–5B<sub>2</sub>O<sub>3</sub>–1Tb<sub>2</sub>O<sub>3</sub>-<em>x</em>Eu<sub>2</sub>O<sub>3</sub> (<em>x</em> = 0–2.5 mol% at 0.5 intervals) glasses were prepared by the melt-quenching method, and the single-phase Sr<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub> glass-ceramics were obtained after heat treatment. The structural and fluorescence performance of the glasses and glass-ceramics were examined using DSC, XRD, SEM, FTIR, and photoluminescence spectra, and the energy transfer process between Tb<sup>3+</sup> and Eu<sup>3+</sup> was systematically investigated. With increasing Eu<sub>2</sub>O<sub>3</sub> contents, the thermal stability of the glasses is enhanced and the density of both the glasses and the glass-ceramics rises. The XRD and SEM results reveal the precipitation of the irregular spherical Sr<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub> microcrystals with a grain size roughly within 0.5–1 μm. Under 376 nm excitation, the overall emission intensity and lifetime of Eu<sup>3+</sup> ions increase with increasing Eu<sub>2</sub>O<sub>3</sub> contents, and the energy transfer efficiency reaches 58.74 % from 31.07 %. According to the Dexter model, the energy transfer process between the Tb<sup>3+</sup> and Eu<sup>3+</sup> is dominated by the quadrupole-quadrupole interactions. By varying the Eu<sub>2</sub>O<sub>3</sub> contents, all the glass-ceramics exhibit higher color purity (82.06–96.27 %), and their chromaticity coordinates shift from yellowish green towards reddish orange, which is potentially promising for w-LEDs.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1016/j.optmat.2024.116136
The constructing of heterojunction piezo-photocatalysts has been regarded as a promising strategy in environmental remediation. Herein, a novel Ag2O/Na0.5Bi0.5TiO3 (Ag2O/NBT) p-n heterojunction is designed by using a facile method, inducing the remarkable enhancement of photocatalytic performance by piezoelectric effect under ultrasonic vibration. The Ag2O/NBT heterojunction can degrade 99 % Rhodamine B (RhB) within 30 min when exposed to light irradiation and ultrasonic vibration simultaneously, with a high reaction rate constant of 0.140 min−1, which is 4.5 times and 17.5 times that of individual photocatalysis (0.031 min−1) and piezocatalysis (0.008 min−1), respectively. Moreover, the Ag2O/NBT heterojunction exhibits excellent stability and reusability after five cycles. The improved piezo-photocatalytic performance can be attributed to the formation of p-n heterojunction and the generation of built-in electric field, which makes a high separation of photogenerated carriers. Finally, a possible piezo-photocatalytic mechanism for removal RhB was proposed based on the radical trapping experiment. It is expected that the results can provide valuable information for the further investigations of Ag2O/NBT heterojunction as a potential piezo-photocatalyst in the environmental remediation.
{"title":"Optimizing catalytic performance of Ag2O/Na0.5Bi0.5TiO3 heterojunction by the piezo-phototronic coupling effect","authors":"","doi":"10.1016/j.optmat.2024.116136","DOIUrl":"10.1016/j.optmat.2024.116136","url":null,"abstract":"<div><div>The constructing of heterojunction piezo-photocatalysts has been regarded as a promising strategy in environmental remediation. Herein, a novel Ag<sub>2</sub>O/Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> (Ag<sub>2</sub>O/NBT) p-n heterojunction is designed by using a facile method, inducing the remarkable enhancement of photocatalytic performance by piezoelectric effect under ultrasonic vibration. The Ag<sub>2</sub>O/NBT heterojunction can degrade 99 % Rhodamine B (RhB) within 30 min when exposed to light irradiation and ultrasonic vibration simultaneously, with a high reaction rate constant of 0.140 min<sup>−1</sup>, which is 4.5 times and 17.5 times that of individual photocatalysis (0.031 min<sup>−1</sup>) and piezocatalysis (0.008 min<sup>−1</sup>), respectively. Moreover, the Ag<sub>2</sub>O/NBT heterojunction exhibits excellent stability and reusability after five cycles. The improved piezo-photocatalytic performance can be attributed to the formation of p-n heterojunction and the generation of built-in electric field, which makes a high separation of photogenerated carriers. Finally, a possible piezo-photocatalytic mechanism for removal RhB was proposed based on the radical trapping experiment. It is expected that the results can provide valuable information for the further investigations of Ag<sub>2</sub>O/NBT heterojunction as a potential piezo-photocatalyst in the environmental remediation.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1016/j.optmat.2024.116133
In this work, the optical properties of niobium pentoxide () films were extensively studied across a wide spectral range using heterogeneous data-processing methods, combining ellipsometric and spectrophotometric measurements for five samples with thicknesses between 20 and 250 nm. This study primarily determined the optical constants of from the far infrared to the vacuum ultraviolet, presenting these constants as dispersion parameters using the universal dispersion model to describe valence electron excitations in ultraviolet region as well as phonon vibrations in infrared region. These comprehensive and reliable data across such a broad spectral range are unprecedented. Secondly, presented optical characterization proofs that films can be grown without defects such as surface roughness, porosity, or inhomogeneity. This fact, together with its high refractive index, makes a promising material for optical applications.
{"title":"Wide spectral range optical characterization of niobium pentoxide (Nb2O5) films by universal dispersion model","authors":"","doi":"10.1016/j.optmat.2024.116133","DOIUrl":"10.1016/j.optmat.2024.116133","url":null,"abstract":"<div><div>In this work, the optical properties of niobium pentoxide (<span><math><mrow><msub><mrow><mtext>Nb</mtext></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mtext>O</mtext></mrow><mrow><mn>5</mn></mrow></msub></mrow></math></span>) films were extensively studied across a wide spectral range using heterogeneous data-processing methods, combining ellipsometric and spectrophotometric measurements for five samples with thicknesses between 20 and 250 nm. This study primarily determined the optical constants of <span><math><mrow><msub><mrow><mtext>Nb</mtext></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mtext>O</mtext></mrow><mrow><mn>5</mn></mrow></msub></mrow></math></span> from the far infrared to the vacuum ultraviolet, presenting these constants as dispersion parameters using the universal dispersion model to describe valence electron excitations in ultraviolet region as well as phonon vibrations in infrared region. These comprehensive and reliable data across such a broad spectral range are unprecedented. Secondly, presented optical characterization proofs that <span><math><mrow><msub><mrow><mtext>Nb</mtext></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mtext>O</mtext></mrow><mrow><mn>5</mn></mrow></msub></mrow></math></span> films can be grown without defects such as surface roughness, porosity, or inhomogeneity. This fact, together with its high refractive index, makes <span><math><mrow><msub><mrow><mtext>Nb</mtext></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mtext>O</mtext></mrow><mrow><mn>5</mn></mrow></msub></mrow></math></span> a promising material for optical applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142315202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1016/j.optmat.2024.116146
The demand for white-light luminescent materials for the white-light-emitting diodes (W-LEDs) field has been growing in modern life. In this work, a series of Sn2+ and Mn2+ ions co-doped highly transparent white-light emitting oxyfluoride glasses (precursor glass, PG) and Sr2LuF7 glass-ceramics (GC) were successfully prepared by the melt-quenching technique. Their luminescent and structural properties were investigated by the transmission spectra, excitation and emission spectra at different temperatures (300-500 K), luminescent decay curves, XRD, and TEM characterizations. Upon excitation with ultraviolet (UV) light, tunable broadband blue-white light emissions of Sn2+ were obtained by adjusting the concentration of Sn2+ ions. A conspicuous energy transfer process from Sn2+ to Mn2+ was observed in Sn2+/Mn2+ co-doped samples. Tunable broadband luminescence between blue-white light and orange-red light regions and nearly pink-white light emission was realized by varying Mn2+ concentration. Furthermore, compared to PG samples, the emissions were enhanced in GC samples due to the crystallization of Sr2LuF7 nanocrystals. Excellent thermal stability was also performed in these Sn2+ doped PG and GC samples with a recovering value of 96 % and 98.8 %, respectively. Simultaneously, Sn2+ doped PG and GC samples also own good optical thermal sensitivities with an SA value of 2.28 % and 2.47 % K-1, respectively. Our results indicate that these Sn2+/Mn2+ co-doped PG and GC may serve as tunable light sources under UV excitation and have prospects on the ratiometric optical thermometry fields.
{"title":"Tunable broadband luminescence of the novel Sn2+ doped oxyfluoride glass and glass-ceramics for W-LEDs","authors":"","doi":"10.1016/j.optmat.2024.116146","DOIUrl":"10.1016/j.optmat.2024.116146","url":null,"abstract":"<div><div>The demand for white-light luminescent materials for the white-light-emitting diodes (W-LEDs) field has been growing in modern life. In this work, a series of Sn<sup>2+</sup> and Mn<sup>2+</sup> ions co-doped highly transparent white-light emitting oxyfluoride glasses (precursor glass, PG) and Sr<sub>2</sub>LuF<sub>7</sub> glass-ceramics (GC) were successfully prepared by the melt-quenching technique. Their luminescent and structural properties were investigated by the transmission spectra, excitation and emission spectra at different temperatures (300-500 K), luminescent decay curves, XRD, and TEM characterizations. Upon excitation with ultraviolet (UV) light, tunable broadband blue-white light emissions of Sn<sup>2+</sup> were obtained by adjusting the concentration of Sn<sup>2+</sup> ions. A conspicuous energy transfer process from Sn<sup>2+</sup> to Mn<sup>2+</sup> was observed in Sn<sup>2+</sup>/Mn<sup>2+</sup> co-doped samples. Tunable broadband luminescence between blue-white light and orange-red light regions and nearly pink-white light emission was realized by varying Mn<sup>2+</sup> concentration. Furthermore, compared to PG samples, the emissions were enhanced in GC samples due to the crystallization of Sr<sub>2</sub>LuF<sub>7</sub> nanocrystals. Excellent thermal stability was also performed in these Sn<sup>2+</sup> doped PG and GC samples with a recovering value of 96 % and 98.8 %, respectively. Simultaneously, Sn<sup>2+</sup> doped PG and GC samples also own good optical thermal sensitivities with an <em>S</em><sub>A</sub> value of 2.28 % and 2.47 % K<sup>-</sup><sup>1</sup>, respectively. Our results indicate that these Sn<sup>2+</sup>/Mn<sup>2+</sup> co-doped PG and GC may serve as tunable light sources under UV excitation and have prospects on the ratiometric optical thermometry fields.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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