Optical Materials最新文献_第7页

Quantum-confined CeO2/NiO nanocomposite with tuneable blue emission for LED and photonic applications 具有可调谐蓝光发射的量子约束CeO2/NiO纳米复合材料用于LED和光子应用

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2026-01-02 DOI: 10.1016/j.optmat.2026.117842

M.P. Srinivasan , K. Jeevagan , T. Jose Antony , R. Divya , A. Ayeshamariam , N. Punithavelan

In this present work, a hydrothermally synthesised CeO₂/NiO nanocomposite with a novel heterojunction interface, quantum-confined deep-blue emission verified by CIE chromaticity mapping, and superior thermal stability, making it a promising environmentally benign material for high-purity LED and display applications. The formation of individual CeO₂ and NiO phases with strong metal–oxygen bonding was evidenced by structural analysis from XRD and FTIR. At the same time, nanosized particles with well-defined lattice fringes were observed by HRSEM and HRTEM, which favoured the presence of a heterojunction interface. The UV–Vis DRS optical band gap estimation revealed quantum confinement-induced blue-shifted transitions with 3.55 eV and 3.74 eV corresponding to CeO₂ and NiO areas, respectively. Photoluminescence (PL) spectra under 237 nm excitation had a prominent blue emission peaking at 480 nm and were associated with the presence of oxygen vacancies and Ce³⁺/Ce⁴⁺ redox species. The emission was also described through CIE chromaticity mapping, with coordinates (x = 0.1985, y = 0.2253) verifying deep-blue emission with high spectral purity. Thermal analysis showed stability up to 500 °C, which proves the material's stability for device integration. These findings confirm the CeO₂/NiO nanocomposite as a viable blue-emitting material for solid-state lighting and optoelectronic display technologies.

在本研究中，一种水热合成的CeO2/NiO纳米复合材料具有新颖的异质结界面，通过CIE色度映射验证了量子限制的深蓝发射，以及优越的热稳定性，使其成为高纯度LED和显示应用的有前途的环保材料。XRD和FTIR的结构分析证实了CeO2和NiO相的形成具有较强的金属-氧键。同时，HRSEM和HRTEM观察到纳米颗粒具有明确的晶格条纹，有利于异质结界面的存在。紫外-可见DRS光学带隙估计显示CeO2和NiO区分别对应3.55 eV和3.74 eV的量子禁锢诱导蓝移跃迁。237 nm激发下的光致发光（PL）光谱在480 nm处有一个突出的蓝色发射峰，这与氧空位和Ce3+/Ce4+氧化还原物质的存在有关。通过CIE色度映射也描述了发射，坐标（x = 0.1985, y = 0.2253）验证了具有高光谱纯度的深蓝色发射。热分析表明，该材料的稳定性高达500°C，证明了该材料在器件集成方面的稳定性。这些发现证实了CeO2/NiO纳米复合材料是固态照明和光电子显示技术中可行的蓝色发射材料。

{"title":"Quantum-confined CeO2/NiO nanocomposite with tuneable blue emission for LED and photonic applications","authors":"M.P. Srinivasan , K. Jeevagan , T. Jose Antony , R. Divya , A. Ayeshamariam , N. Punithavelan","doi":"10.1016/j.optmat.2026.117842","DOIUrl":"10.1016/j.optmat.2026.117842","url":null,"abstract":"<div><div>In this present work, a hydrothermally synthesised CeO2/NiO nanocomposite with a novel heterojunction interface, quantum-confined deep-blue emission verified by CIE chromaticity mapping, and superior thermal stability, making it a promising environmentally benign material for high-purity LED and display applications. The formation of individual CeO2 and NiO phases with strong metal–oxygen bonding was evidenced by structural analysis from XRD and FTIR. At the same time, nanosized particles with well-defined lattice fringes were observed by HRSEM and HRTEM, which favoured the presence of a heterojunction interface. The UV–Vis DRS optical band gap estimation revealed quantum confinement-induced blue-shifted transitions with 3.55 eV and 3.74 eV corresponding to CeO2 and NiO areas, respectively. Photoluminescence (PL) spectra under 237 nm excitation had a prominent blue emission peaking at 480 nm and were associated with the presence of oxygen vacancies and Ce3+/Ce4+ redox species. The emission was also described through CIE chromaticity mapping, with coordinates (x = 0.1985, y = 0.2253) verifying deep-blue emission with high spectral purity. Thermal analysis showed stability up to 500 °C, which proves the material's stability for device integration. These findings confirm the CeO2/NiO nanocomposite as a viable blue-emitting material for solid-state lighting and optoelectronic display technologies.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"173 ","pages":"Article 117842"},"PeriodicalIF":4.2,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145895941","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}

引用次数: 0

Highly photoluminescent polymer films deposited on glass and flexible substrates based on partially oxidized silicon nanocrystals 基于部分氧化硅纳米晶体的高光致发光聚合物薄膜沉积在玻璃和柔性衬底上

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2026-01-02 DOI: 10.1016/j.optmat.2025.117841

A. Coyopol , A.M. Sánchez , A. Alvarado-García , R. Romano-Trujillo , G. García-Salgado , E. Rosendo , C. Morales

In this work, optical properties of Silicon (Si) Oxide powders with Si nanocrystals (Si-nCs) embedded in a polymeric matrix (polymethyl methacrylate-PMMA) on BK7 glass and flexible substrates (acetate) are reported. The Si oxide powders were exfoliated from porous silicon layers (PSLs) with porosities of 57–98.3 % obtained at 65 mA. The PSLs were obtained by electrochemical etching using, Si p-type (110), ρ = 0.25–0.6 Ω-cm. For this, current densities of 65 mA and 35 mA were used with hydrofluoric acid and ethanol solution (Hf:EtOH) in (3:1), (1:3), (1:2), and (1:1) proportions respectively. To passivate and preserve the Photoluminescence (PL), the Si-oxide powders collected from exfoliation of PSLs were immersed at the polymeric matrix and deposited on acetate and BK7 glass substrates by spin-coating method. The PSLs were characterized by Photoluminescence (PL), Scanning Electron Microscopy (SEM) and X-ray spectroscopy (EDS). Subsequently, Si-oxide powders as a polymeric film exhibited strong PL emission either on acetate or on BK7 glass substrates, for which samples were characterized by PL and Raman measurements. The presence of oxidized Si-nCs were detected by Raman measurements, with average sizes between 1 and 1.5 nm, creating radiative defects (Si=O) that could be responsible of PL. The PSLs PL emission maximum position remained almost at the same wavelength even after when it is deposited on the polymer. In this manner, oxidized Si-nCs serve as effective passivating agents for PL.

本文报道了在BK7玻璃和柔性衬底（醋酸盐）上嵌入聚合物基体（聚甲基丙烯酸甲酯- pmma）的硅纳米晶（Si- ncs）氧化硅粉末的光学性质。在65毫安时，从多孔硅层（PSLs）中分离得到孔隙率为57 ~ 98.3%的氧化硅粉末。采用Si p型（110），ρ = 0.25-0.6 Ω-cm电化学刻蚀法制备PSLs。为此，分别以（3:1）、（1:3）、（1:2）和（1:1）比例的氢氟酸和乙醇溶液（Hf:EtOH）的电流密度为65 mA和35 mA。为了钝化和保存光致发光（PL），将从PSLs剥离中收集的si -氧化物粉末浸泡在聚合物基体中，并通过旋涂法沉积在醋酸盐和BK7玻璃衬底上。采用光致发光（PL）、扫描电镜（SEM）和x射线能谱（EDS）对合成的psl进行了表征。随后，硅氧化物粉末作为聚合物薄膜在醋酸盐或BK7玻璃衬底上表现出强烈的PL发射，样品通过PL和拉曼测量进行了表征。通过拉曼测量检测到氧化Si- ncs的存在，其平均尺寸在1到1.5 nm之间，产生可能导致发光的辐射缺陷（Si=O）。即使沉积在聚合物上，psl的发光最大位置也几乎保持在同一波长。通过这种方式，氧化的Si-nCs作为PL的有效钝化剂。

{"title":"Highly photoluminescent polymer films deposited on glass and flexible substrates based on partially oxidized silicon nanocrystals","authors":"A. Coyopol , A.M. Sánchez , A. Alvarado-García , R. Romano-Trujillo , G. García-Salgado , E. Rosendo , C. Morales","doi":"10.1016/j.optmat.2025.117841","DOIUrl":"10.1016/j.optmat.2025.117841","url":null,"abstract":"<div><div>In this work, optical properties of Silicon (Si) Oxide powders with Si nanocrystals (Si-nCs) embedded in a polymeric matrix (polymethyl methacrylate-PMMA) on BK7 glass and flexible substrates (acetate) are reported. The Si oxide powders were exfoliated from porous silicon layers (PSLs) with porosities of 57–98.3 % obtained at 65 mA. The PSLs were obtained by electrochemical etching using, Si p-type (110), ρ = 0.25–0.6 Ω-cm. For this, current densities of 65 mA and 35 mA were used with hydrofluoric acid and ethanol solution (Hf:EtOH) in (3:1), (1:3), (1:2), and (1:1) proportions respectively. To passivate and preserve the Photoluminescence (PL), the Si-oxide powders collected from exfoliation of PSLs were immersed at the polymeric matrix and deposited on acetate and BK7 glass substrates by spin-coating method. The PSLs were characterized by Photoluminescence (PL), Scanning Electron Microscopy (SEM) and X-ray spectroscopy (EDS). Subsequently, Si-oxide powders as a polymeric film exhibited strong PL emission either on acetate or on BK7 glass substrates, for which samples were characterized by PL and Raman measurements. The presence of oxidized Si-nCs were detected by Raman measurements, with average sizes between 1 and 1.5 nm, creating radiative defects (Si=O) that could be responsible of PL. The PSLs PL emission maximum position remained almost at the same wavelength even after when it is deposited on the polymer. In this manner, oxidized Si-nCs serve as effective passivating agents for PL.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"173 ","pages":"Article 117841"},"PeriodicalIF":4.2,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928794","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}

引用次数: 0

High-performance self-powered solar-blind ultraviolet photodetector based on GaN/κ-Ga2O3 heterojunction 基于GaN/κ-Ga2O3异质结的高性能自供电太阳盲紫外探测器

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2026-01-02 DOI: 10.1016/j.optmat.2026.117843

Qianqian Zhan , Yang Li , Linkai Yue , Mengfan Xu , Xinrui Zhao , Wenxiang Mu , Zhitai Jia

Self-powered solar-blind ultraviolet photodetectors (SBPDs) based on Ga₂O₃ exhibit significant advantages in practical applications due to their high efficiency, low power consumption, and fast response speed. In this study, Sn-doped κ-Ga₂O₃ films were epitaxially grown on GaN/sapphire substrates using a cost-effective and environmentally friendly mist-chemical vapor deposition (Mist-CVD), enabling fabrication of a self-powered SBPD based on a GaN/κ-Ga₂O₃ heterojunction. At zero bias under 254 nm illumination with 500 μW/cm² optical power density, the device exhibited a photocurrent of 1.61 × 10⁻⁷ A, photo-to-dark current ratio of 2.78 × 10³, responsivity of 80.5 mA/W, external quantum efficiency of 39.38 %, detectivity of 1.18 × 10¹² Jones, and rise/decay times of 660 ms/590 ms. This result substantially outperforms those of previously reported self-powered SBPDs based on either β-Ga₂O₃ or amorphous Ga₂O₃. The energy band alignment diagrams were constructed to elucidate the carrier transport mechanism in the self-powered SBPD based on the GaN/κ-Ga₂O₃ heterojunction. The incorporation of Sn substantially enhanced the separation efficiency of photogenerated carriers, consequently improving the photoelectric performance of the device. This study provides a promising strategy for fabricating high-performance Ga₂O₃-based SBPDs.

基于Ga2O3的自供电太阳盲紫外探测器（sbpd）具有效率高、功耗低、响应速度快等特点，在实际应用中具有显著的优势。在本研究中，采用经济高效且环保的雾-化学气相沉积（雾- cvd）技术在GaN/蓝宝石衬底上外延生长sn掺杂的κ-Ga2O3薄膜，从而制备了基于GaN/κ-Ga2O3异质结的自供电SBPD。在254 nm、500 μW/cm2光功率密度的零偏置条件下，器件的光电流为1.61 × 10−7 a，光暗比为2.78 × 103，响应率为80.5 mA/W，外量子效率为39.38%，探测率为1.18 × 1012 Jones，上升/衰减时间为660 ms/590 ms。这一结果大大优于先前报道的基于β-Ga2O3或非晶Ga2O3的自供电sbpd。构建了能带排列图，阐明了GaN/κ-Ga2O3异质结自供电SBPD中的载流子输运机制。Sn的加入大大提高了光生载流子的分离效率，从而提高了器件的光电性能。该研究为制备高性能ga2o3基sbpd提供了一种有前途的策略。

{"title":"High-performance self-powered solar-blind ultraviolet photodetector based on GaN/κ-Ga2O3 heterojunction","authors":"Qianqian Zhan , Yang Li , Linkai Yue , Mengfan Xu , Xinrui Zhao , Wenxiang Mu , Zhitai Jia","doi":"10.1016/j.optmat.2026.117843","DOIUrl":"10.1016/j.optmat.2026.117843","url":null,"abstract":"<div><div>Self-powered solar-blind ultraviolet photodetectors (SBPDs) based on Ga2O3 exhibit significant advantages in practical applications due to their high efficiency, low power consumption, and fast response speed. In this study, Sn-doped κ-Ga2O3 films were epitaxially grown on GaN/sapphire substrates using a cost-effective and environmentally friendly mist-chemical vapor deposition (Mist-CVD), enabling fabrication of a self-powered SBPD based on a GaN/κ-Ga2O3 heterojunction. At zero bias under 254 nm illumination with 500 μW/cm2 optical power density, the device exhibited a photocurrent of 1.61 × 10−7 A, photo-to-dark current ratio of 2.78 × 103, responsivity of 80.5 mA/W, external quantum efficiency of 39.38 %, detectivity of 1.18 × 1012 Jones, and rise/decay times of 660 ms/590 ms. This result substantially outperforms those of previously reported self-powered SBPDs based on either β-Ga2O3 or amorphous Ga2O3. The energy band alignment diagrams were constructed to elucidate the carrier transport mechanism in the self-powered SBPD based on the GaN/κ-Ga2O3 heterojunction. The incorporation of Sn substantially enhanced the separation efficiency of photogenerated carriers, consequently improving the photoelectric performance of the device. This study provides a promising strategy for fabricating high-performance Ga2O3-based SBPDs.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"173 ","pages":"Article 117843"},"PeriodicalIF":4.2,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928239","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}

引用次数: 0

Dynamic spin-state reprogramming in Mn-doped in Co site of LaCoO3 for sustainable photocatalytic water treatment 锰掺杂Co位LaCoO3的动态自旋态重编程用于可持续光催化水处理

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2025-12-31 DOI: 10.1016/j.optmat.2025.117793

T. Sasikala , O. Raina , T. Swathi , R. Marnadu , Mohd Shkir , Mohamed Benghanem , Vasudeva Reddy Minnam Reddy , Woo Kyoung Kim

Mn-doped LaCoO₃ perovskites (LaCo_1-xMn_xO₃, x = 0–0.20) were synthesized via a sol–gel route and systematically investigated as visible-light-responsive photocatalysts for the degradation of Rhodamine B (RhB). Structural and morphological analyses confirmed the formation of phase-pure perovskites with reduced crystallite size and lattice expansion upon Mn incorporation. Mn doping effectively modulated the electronic structure, leading to bandgap narrowing (2.27 → 1.98 eV), the creation of oxygen vacancies, and the establishment of Mn³⁺/Mn⁴⁺- Co²⁺/Co³⁺ redox couples. The resulting lattice expansion decreased the crystal field splitting energy, driving a low-spin (t_2g⁶ e_g⁰) → high-spin (t_2g⁴ e_g²) transition in Co³⁺ ions. This spin-state reprogramming activated e_g orbitals, enhanced Co 3d-O 2p hybridization, and promoted spin-polarized charge transport, enabling efficient carrier separation and migration. Consequently, LaCo_0.80Mn_0.20O₃ exhibited superior photocatalytic activity, achieving >90 % RhB degradation within 60 min under visible-light irradiation. PL and EIS analyses corroborated reduced charge recombination and improved conductivity, while scavenger studies confirmed •O₂⁻ and •OH radicals as dominant reactive species. The catalyst also demonstrated excellent recyclability and structural stability. This study unveils spin-state reprogramming coupled with oxygen vacancy engineering as an effective route to design next-generation LaCoO₃-based photocatalysts for sustainable visible-light-driven water purification.

采用溶胶-凝胶法合成了mn掺杂LaCoO3钙钛矿（LaCo1-xMnxO3, x = 0-0.20），并对其作为可见光响应光催化剂降解罗丹明B （RhB）进行了系统研究。结构和形态分析证实Mn掺入后形成了相纯钙钛矿，晶粒尺寸减小，晶格膨胀。Mn掺杂有效地调节了电子结构，导致带隙缩小（2.27→1.98 eV），产生氧空位，并建立了Mn3+/Mn4+- Co2+/Co3+氧化还原对。由此产生的晶格膨胀降低了晶体场分裂能量，驱动Co3+离子的低自旋（t2g6 eg0）→高自旋（t2g4 eg2）转变。这种自旋态重编程激活了eg轨道，增强了Co 3d-O 2p杂化，促进了自旋极化电荷输运，实现了高效的载流子分离和迁移。因此，LaCo0.80Mn0.20O3表现出优异的光催化活性，在可见光照射下60 min内实现了90%的RhB降解。PL和EIS分析证实了电荷重组的减少和电导率的提高，而清除剂研究证实了•O2−和•OH自由基是主要的反应物质。该催化剂还具有良好的可回收性和结构稳定性。该研究揭示了自旋态重编程结合氧空位工程作为设计下一代lacoo3光催化剂的有效途径，用于可持续可见光驱动的水净化。

{"title":"Dynamic spin-state reprogramming in Mn-doped in Co site of LaCoO3 for sustainable photocatalytic water treatment","authors":"T. Sasikala , O. Raina , T. Swathi , R. Marnadu , Mohd Shkir , Mohamed Benghanem , Vasudeva Reddy Minnam Reddy , Woo Kyoung Kim","doi":"10.1016/j.optmat.2025.117793","DOIUrl":"10.1016/j.optmat.2025.117793","url":null,"abstract":"<div><div>Mn-doped LaCoO3 perovskites (LaCo1-xMnxO3, x = 0–0.20) were synthesized via a sol–gel route and systematically investigated as visible-light-responsive photocatalysts for the degradation of Rhodamine B (RhB). Structural and morphological analyses confirmed the formation of phase-pure perovskites with reduced crystallite size and lattice expansion upon Mn incorporation. Mn doping effectively modulated the electronic structure, leading to bandgap narrowing (2.27 → 1.98 eV), the creation of oxygen vacancies, and the establishment of Mn3+/Mn4+- Co2+/Co3+ redox couples. The resulting lattice expansion decreased the crystal field splitting energy, driving a low-spin (t2g6 eg0) → high-spin (t2g4 eg2) transition in Co3+ ions. This spin-state reprogramming activated eg orbitals, enhanced Co 3d-O 2p hybridization, and promoted spin-polarized charge transport, enabling efficient carrier separation and migration. Consequently, LaCo0.80Mn0.20O3 exhibited superior photocatalytic activity, achieving >90 % RhB degradation within 60 min under visible-light irradiation. PL and EIS analyses corroborated reduced charge recombination and improved conductivity, while scavenger studies confirmed •O2− and •OH radicals as dominant reactive species. The catalyst also demonstrated excellent recyclability and structural stability. This study unveils spin-state reprogramming coupled with oxygen vacancy engineering as an effective route to design next-generation LaCoO3-based photocatalysts for sustainable visible-light-driven water purification.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"173 ","pages":"Article 117793"},"PeriodicalIF":4.2,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928241","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}

引用次数: 0

Temperature dependence of Cr2＋–Fe2＋ ions energy transfer efficiency in Zn1−xMnxSe (x = 0.3) crystal and its influence on Fe2＋ ions decay Zn1 - xMnxSe （x = 0.3）晶体中Cr2+ -Fe2 +离子能量转移效率的温度依赖性及其对Fe2+离子衰变的影响

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2025-12-30 DOI: 10.1016/j.optmat.2025.117836

M.E. Doroshenko , H. Jelinkova , A. Riha , K. Pierpoint

The temperature dependence of Cr^2＋ and Fe^2＋ ions decay times, as well as non-radiative energy transfer macroparameter

γ

of the Cr^2＋–Fe^2＋ interaction efficiency was determined. The experimentally observed data were then used for a successive description of the decay kinetics of Fe^2＋ ions in the case of excitation via Cr^2＋–Fe^2＋ energy transfer.

测定了Cr2+和Fe2+离子衰变时间的温度依赖性以及Cr2+ -Fe2 +相互作用效率的非辐射能量转移宏观参数γ。实验观察到的数据随后被用于连续描述通过Cr2+ -Fe2 +能量转移激发的Fe2+离子的衰变动力学。

引用次数: 0

Nonlinear optical responses of MXene/Metal oxide hybrid material for passive mode-locking in thulium/holmium-doped fiber laser 掺铥/掺钬光纤激光器中MXene/金属氧化物杂化材料被动锁模的非线性光学响应

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2025-12-29 DOI: 10.1016/j.optmat.2025.117835

Muhammad Asnawi Zainal , Mohamad Akmal Mohamad Lutfi , Norazriena Yusoff , Siti Nabila Aidit , Harith Ahmad

MXenes are drawing considerable attention in ultrafast photonics due to their layered structure and strong nonlinear optical performance. Complementing this, metal oxides (MO) offer the structural and chemical versatility needed to create more robust hybrid materials. Our study leverages the combined properties of both material classes to synthesize niobium carbide/cobalt oxide (Nb₂CT_x/Co₃O₄) hybrid material, prepared using a solution-based method with ultrasonication. The nonlinear optical properties of the prepared Nb₂CT_x/Co₃O₄ coated onto the side-polished fiber were measured using the balanced twin detection method. Our findings reveal that Nb₂CT_x/Co₃O₄ hybrid SA exhibits good saturation absorption properties, with a saturation intensity of 3.4 MW/cm², modulation depth of 10.5 %, and non-saturable loss of 81.1 %. Upon integrating the fabricated SA into a full-ring thulium/holmium-doped fiber laser (THDFL) cavity, stable mode-locking was achieved, with the laser operating at a center wavelength of 1901 nm. The generated pulses had a repetition rate of 14.2 MHz and a pulse width of 1.28 ps. The laser exhibited good stability, with a signal-to-noise ratio (SNR) of approximately 44 dB and no significant fluctuations observed during long-term operation. These results highlight the promising performance of Nb₂CT_x/Co₃O₄ as an SA and demonstrate its potential as a hybrid MXene–metal oxide SA for future ultrafast photonic devices.

MXenes由于其层状结构和较强的非线性光学性能而在超快光子学领域受到广泛关注。与此相辅相成的是，金属氧化物（MO）提供了制造更坚固的混合材料所需的结构和化学多功能性。本研究利用这两种材料的综合性能，采用超声法制备了碳化铌/氧化钴（Nb2CTx/Co3O4）杂化材料。利用平衡孪晶检测法测量了涂覆在侧面抛光光纤上的Nb2CTx/Co3O4的非线性光学性能。研究结果表明，Nb2CTx/Co3O4杂化SA具有良好的饱和吸收性能，饱和强度为3.4 MW/cm2，调制深度为10.5%，不饱和损耗为81.1%。将制备的SA集成到全环掺铥/钬光纤激光器（THDFL）腔中，实现了稳定的锁模，激光器工作在1901 nm的中心波长。产生的脉冲重复频率为14.2 MHz，脉冲宽度为1.28 ps。激光器表现出良好的稳定性，信噪比（SNR）约为44 dB，在长期工作期间未观察到明显的波动。这些结果突出了Nb2CTx/Co3O4作为SA的良好性能，并展示了它作为混合mxene -金属氧化物SA在未来超快光子器件中的潜力。

{"title":"Nonlinear optical responses of MXene/Metal oxide hybrid material for passive mode-locking in thulium/holmium-doped fiber laser","authors":"Muhammad Asnawi Zainal , Mohamad Akmal Mohamad Lutfi , Norazriena Yusoff , Siti Nabila Aidit , Harith Ahmad","doi":"10.1016/j.optmat.2025.117835","DOIUrl":"10.1016/j.optmat.2025.117835","url":null,"abstract":"<div><div>MXenes are drawing considerable attention in ultrafast photonics due to their layered structure and strong nonlinear optical performance. Complementing this, metal oxides (MO) offer the structural and chemical versatility needed to create more robust hybrid materials. Our study leverages the combined properties of both material classes to synthesize niobium carbide/cobalt oxide (Nb2CTx/Co3O4) hybrid material, prepared using a solution-based method with ultrasonication. The nonlinear optical properties of the prepared Nb2CTx/Co3O4 coated onto the side-polished fiber were measured using the balanced twin detection method. Our findings reveal that Nb2CTx/Co3O4 hybrid SA exhibits good saturation absorption properties, with a saturation intensity of 3.4 MW/cm2, modulation depth of 10.5 %, and non-saturable loss of 81.1 %. Upon integrating the fabricated SA into a full-ring thulium/holmium-doped fiber laser (THDFL) cavity, stable mode-locking was achieved, with the laser operating at a center wavelength of 1901 nm. The generated pulses had a repetition rate of 14.2 MHz and a pulse width of 1.28 ps. The laser exhibited good stability, with a signal-to-noise ratio (SNR) of approximately 44 dB and no significant fluctuations observed during long-term operation. These results highlight the promising performance of Nb2CTx/Co3O4 as an SA and demonstrate its potential as a hybrid MXene–metal oxide SA for future ultrafast photonic devices.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"172 ","pages":"Article 117835"},"PeriodicalIF":4.2,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145885289","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}

引用次数: 0

CuO/ZnO Bi-layered nanoarchitecture for room temperature CO2 sensing at low concentrations 低浓度室温CO2传感的CuO/ZnO双层纳米结构

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2025-12-29 DOI: 10.1016/j.optmat.2025.117840

Selwa Kebaili , Sabrina Iaiche , Faycal Bensouici , Abdelkader Djelloul , Stefano Bellucci , Fatima Boudeffar , Hocine Cheraga , Nour Eddine Gabouze , Mohamed Bououdina

Bi-layered ZnO/CuO nanostructured films have been examined for CO₂ gas sensing applications. X-ray diffraction, Fourier transform infrared, and Raman spectroscopy confirm the formation of a hexagonal wurtzite ZnO and a monoclinic CuO. Scanning electron and atomic force microscopies' observations reveal homogeneous, dense, and quasi-porous surfaces with smooth spherical sponge-like (ZnO), rough spherical-like (CuO and ZnO/CuO), and rough flat plate-like (for CuO/ZnO) grains morphologies with a few cracks. UV–visible spectroscopy shows greater transmittance (45–90 %) in the infrared and visible domains, while the energy bandgap decreases significantly from 3.3 eV for ZnO to 1.5 eV for the remaining films. The measurements of the sensor's electrical characteristics at room temperature, including current-voltage (I–V), sensitivity-concentration (S–C), and current-time (I-t), indicate a sensitivity to the presence of CO₂ gas and that the fabricated sensor exhibits excellent sensitivity and faster response/recovery times. Indeed, the ZnO thin-film sensor recorded the highest sensitivity of 44.77 % at 31 ppm carbon dioxide concentration at room temperature. Based on the results obtained, a sensing mechanism is proposed. The findings demonstrate that metal oxide multilayered nanostructures are promising candidates for applications such as gas sensing, photocatalysis, and UV photodetection.

研究了双层ZnO/CuO纳米结构薄膜在CO2气体传感中的应用。x射线衍射，傅里叶变换红外和拉曼光谱证实了六方纤锌矿ZnO和单斜CuO的形成。扫描电子显微镜和原子力显微镜观察显示，表面均匀致密，具有光滑的球形海绵状（ZnO），粗糙的球形（CuO和ZnO/CuO）和粗糙的平板状（CuO /ZnO）晶粒形貌，并有少量裂纹。紫外可见光谱显示，ZnO薄膜在红外和可见光区域具有较高的透光率（45 ~ 90%），而其余薄膜的能带隙从ZnO的3.3 eV显著减小到1.5 eV。在室温下测量传感器的电气特性，包括电流-电压（I-V），灵敏度-浓度（S-C）和电流-时间（I-t），表明对CO2气体存在的灵敏度，并且制造的传感器具有出色的灵敏度和更快的响应/恢复时间。在室温下，当二氧化碳浓度为31 ppm时，ZnO薄膜传感器的灵敏度最高，达到44.77%。在此基础上，提出了一种传感机制。研究结果表明，金属氧化物多层纳米结构在气体传感、光催化和紫外光探测等领域具有广阔的应用前景。

{"title":"CuO/ZnO Bi-layered nanoarchitecture for room temperature CO2 sensing at low concentrations","authors":"Selwa Kebaili , Sabrina Iaiche , Faycal Bensouici , Abdelkader Djelloul , Stefano Bellucci , Fatima Boudeffar , Hocine Cheraga , Nour Eddine Gabouze , Mohamed Bououdina","doi":"10.1016/j.optmat.2025.117840","DOIUrl":"10.1016/j.optmat.2025.117840","url":null,"abstract":"<div><div>Bi-layered ZnO/CuO nanostructured films have been examined for CO2 gas sensing applications. X-ray diffraction, Fourier transform infrared, and Raman spectroscopy confirm the formation of a hexagonal wurtzite ZnO and a monoclinic CuO. Scanning electron and atomic force microscopies' observations reveal homogeneous, dense, and quasi-porous surfaces with smooth spherical sponge-like (ZnO), rough spherical-like (CuO and ZnO/CuO), and rough flat plate-like (for CuO/ZnO) grains morphologies with a few cracks. UV–visible spectroscopy shows greater transmittance (45–90 %) in the infrared and visible domains, while the energy bandgap decreases significantly from 3.3 eV for ZnO to 1.5 eV for the remaining films. The measurements of the sensor's electrical characteristics at room temperature, including current-voltage (I–V), sensitivity-concentration (S–C), and current-time (I-t), indicate a sensitivity to the presence of CO2 gas and that the fabricated sensor exhibits excellent sensitivity and faster response/recovery times. Indeed, the ZnO thin-film sensor recorded the highest sensitivity of 44.77 % at 31 ppm carbon dioxide concentration at room temperature. Based on the results obtained, a sensing mechanism is proposed. The findings demonstrate that metal oxide multilayered nanostructures are promising candidates for applications such as gas sensing, photocatalysis, and UV photodetection.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"172 ","pages":"Article 117840"},"PeriodicalIF":4.2,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145885291","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}

引用次数: 0

Effects of Si doping on the optical properties of n-type GaN crystals Si掺杂对n型GaN晶体光学性质的影响

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2025-12-29 DOI: 10.1016/j.optmat.2025.117837

Zhanguo Qi , Shouzhi Wang , Zhongxin Wang , Qiubo Li , Huihui Shao , Lei Liu , Guodong Wang , Xiufang Chen , Shuang Zhang , Kaize Jiang , Xiangang Xu , Lei Zhang

This study utilizes hydride vapor phase epitaxy (HVPE) technology combined with a porous gallium nitride (GaN) substrate. By optimizing the growth mode and buffer layer structure, the dislocation density is effectively reduced. Using silane (SiH₄) as the doping source, the influence of Si doping on the optical properties of GaN is systematically investigated by regulating the doping flows (0–60 sccm). Ultimately, a uniformly doped 2-inch n-type Si-doped GaN single crystal substrate was successfully grown and processed with a surface roughness of <0.2 nm: the Si concentration is ∼2 × 10¹⁹ cm⁻³, the resistivity is as low as 0.0045 Ω cm, the (002) plane high-resolution X-ray diffraction full width at half maximum is 61.60 arcsec, and the dislocation density is ∼1.14 × 10⁶ cm⁻².

本研究利用氢化物气相外延（HVPE）技术结合多孔氮化镓（GaN）衬底。通过优化生长方式和缓冲层结构，有效地降低了位错密度。以硅烷（SiH4）为掺杂源，通过调节掺杂流量（0 ~ 60 sccm），系统研究了Si掺杂对GaN光学性能的影响。最终，成功生长并加工出均匀掺杂的2英寸n型Si掺杂GaN单晶衬底，表面粗糙度为<；0.2 nm， Si浓度为~ 2 × 1019 cm−3，电阻率低至0.0045 Ω cm,（002）平面高分辨率x射线衍射半最大全宽为61.60 arcsec，位错密度为~ 1.14 × 106 cm−2。

引用次数: 0

Femtosecond laser direct writing of dual-wavelength waveguide lasers in Nd:YAP crystal 双波长波导激光器在Nd:YAP晶体中的飞秒激光直接写入

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2025-12-28 DOI: 10.1016/j.optmat.2025.117838

Lijuan Shi , Pengda Wang , Yiding Fei , Kun Zhang , Jiaxiang Zhou , Bin Zhang , Yingying Ren , Weijin Kong , Lingqi Li

We report on the fabrication of depressed cladding waveguides in anisotropic neodymium-doped yttrium orthoaluminate (Nd:YAlO₃ or Nd:YAP) crystal by femtosecond laser direct writing. Three waveguides are fabricated along different crystallographic orientations and exhibit good guiding properties. Confocal micro-photoluminescence (μ-PL) spectroscopy reveals that the crystalline microstructure after laser irradiation preserves the luminescence characteristics of Nd³⁺ ions in the waveguide cores. Under optical pumping at 804 nm, the fabricated a-axis and b-axis waveguides support simultaneous dual-wavelength laser oscillation at 1064 nm and 1079 nm, with an output power ratio that can be adjusted by varying the pump polarization. This work facilitate the development of miniature dual-wavelength laser sources based on laser-written Nd:YAP waveguides.

本文报道了利用飞秒激光直接写入技术在各向异性掺钕正铝酸钇（Nd:YAlO3或Nd:YAP）晶体中制备抑制包层波导。沿着不同的晶体取向制备了三种波导，并表现出良好的导向性能。共聚焦微光致发光（μ-PL）光谱分析表明，激光照射后的晶体结构保留了波导芯中Nd3+离子的发光特性。在804 nm光泵浦下，制备的a轴和b轴波导支持1064 nm和1079 nm的双波长激光振荡，输出功率比可以通过改变泵浦偏振来调节。这项工作促进了基于激光写入Nd:YAP波导的微型双波长激光源的发展。

引用次数: 0

Preparation and catalytic performance of low-cost S-doped short columnar micro-nano structure ZrO2 低成本s掺杂短柱状微纳结构ZrO2的制备及其催化性能

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials

Pub Date : 2025-12-27 DOI: 10.1016/j.optmat.2025.117833

Ping Li , Weixia Dong , Chenlang Xu , Qifu Bao , Zhiwen Hu , Gao-ling Zhao

S-doped ZrO₂ with a short columnar micro-nano structure was successfully synthesized through a cost-effective solvothermal method using biomass feathers as a morphology-inducing agent. The phase composition, microstructure, oxygen vacancy specific surface area, and optical properties of the as-prepared powders were systematically characterized by XRD, FE-SEM, TEM, XPS, BET, UV–Vis DRS and FT-IR, etc, respectively. Results revealed that the biomass content critically governed the morphological evolution and surface area optimization of ZrO₂. At an optimal biomass dosage of 0.2 %, the synthesized ZrO₂ exhibited a hierarchical architecture comprising short columnar microstructures decorated with surface-adhered nanoparticles. Photocatalytic evaluation under visible light demonstrated a 99.14 % degradation efficiency for 5 mg/L RhB within 90 min, outperforming spherical ZrO₂ (synthesized without biomass) by a factor of 4.6 in reaction rate constant. In addition, the S-doped ZrO₂ material, featuring a short columnar micro-nano structure, exhibits excellent stability during photocatalytic reactions. Furthermore, its micrometer-scale dimensionality ensures convenient handling and storage. This work highlights the dual role of biomass in steering micro/nanostructural engineering and enhancing photocatalytic properties through synergistic morphology-doping effects.

以生物质羽毛为形态诱导剂，通过溶剂热法成功合成了具有短柱状微纳结构的s掺杂ZrO2。采用XRD、FE-SEM、TEM、XPS、BET、UV-Vis DRS、FT-IR等手段对制备的粉体的物相组成、微观结构、氧空位比表面积和光学性能进行了系统表征。结果表明，生物量对ZrO2的形态演化和表面积优化具有重要的控制作用。在最佳生物质添加量为0.2%时，合成的ZrO2呈现出由表面粘附纳米颗粒装饰的短柱状微结构组成的层次化结构。可见光下的光催化评价表明，在90 min内对5 mg/L RhB的降解效率为99.14%，反应速率常数为球形ZrO2（无生物质合成）的4.6倍。此外，s掺杂ZrO2材料具有短柱状微纳结构，在光催化反应中表现出优异的稳定性。此外，其微米级的尺寸确保了方便的搬运和存储。这项工作强调了生物质在引导微/纳米结构工程和通过协同形态掺杂效应增强光催化性能方面的双重作用。

{"title":"Preparation and catalytic performance of low-cost S-doped short columnar micro-nano structure ZrO2","authors":"Ping Li , Weixia Dong , Chenlang Xu , Qifu Bao , Zhiwen Hu , Gao-ling Zhao","doi":"10.1016/j.optmat.2025.117833","DOIUrl":"10.1016/j.optmat.2025.117833","url":null,"abstract":"<div><div>S-doped ZrO2 with a short columnar micro-nano structure was successfully synthesized through a cost-effective solvothermal method using biomass feathers as a morphology-inducing agent. The phase composition, microstructure, oxygen vacancy specific surface area, and optical properties of the as-prepared powders were systematically characterized by XRD, FE-SEM, TEM, XPS, BET, UV–Vis DRS and FT-IR, etc, respectively. Results revealed that the biomass content critically governed the morphological evolution and surface area optimization of ZrO2. At an optimal biomass dosage of 0.2 %, the synthesized ZrO2 exhibited a hierarchical architecture comprising short columnar microstructures decorated with surface-adhered nanoparticles. Photocatalytic evaluation under visible light demonstrated a 99.14 % degradation efficiency for 5 mg/L RhB within 90 min, outperforming spherical ZrO2 (synthesized without biomass) by a factor of 4.6 in reaction rate constant. In addition, the S-doped ZrO2 material, featuring a short columnar micro-nano structure, exhibits excellent stability during photocatalytic reactions. Furthermore, its micrometer-scale dimensionality ensures convenient handling and storage. This work highlights the dual role of biomass in steering micro/nanostructural engineering and enhancing photocatalytic properties through synergistic morphology-doping effects.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"172 ","pages":"Article 117833"},"PeriodicalIF":4.2,"publicationDate":"2025-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145885287","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}

引用次数: 0