Optical Materials最新文献

{"title":"Dual-mode luminescent thermometry in LiYO2:Nd3+,Yb3+ enabled by structural phase transition and phonon-assisted energy transfer","authors":"M. Tahir Abbas ,&nbsp;M. Szymczak ,&nbsp;D. Szymanski ,&nbsp;M. Drozd ,&nbsp;G. Chen ,&nbsp;L. Marciniak","doi":"10.1016/j.optmat.2026.117985","DOIUrl":"10.1016/j.optmat.2026.117985","url":null,"abstract":"<div><div>In this work, a dual-mode luminescent thermometer operating via both ratiometric and lifetime-based readout strategies was developed, enabled by the coexistence of two thermally driven effects: a structural phase transition in LiYO₂ and a phonon-assisted energy transfer from Yb³⁺ to Nd³⁺. As demonstrated, changes in the shape of the emission band of Yb³⁺ ions corresponding to the ²F_5/2 → ²F_7/2 electronic transition, induced by the phase transition, allowed the design of a ratiometric thermometer with a maximum relative sensitivity (<em>S</em>_<em>R</em>) of 3.1% K⁻¹ for LiYO₂:10%Yb³⁺, 1% Nd³⁺ at 290 K. On the other hand, the temperature-dependent Yb³⁺ → Nd³⁺ energy transfer facilitated the development of a lifetime-based thermometer with a maximum <em>S</em>_<em>R</em> of 1.5% K⁻¹ for 20% Nd³⁺ at 378 K. In both approaches, tuning the Nd³⁺ ions concentration enabled modulation of both the sensitivity and the temperature at which the maximum <em>S</em>_<em>R</em> was achieved. This was accomplished by shifting the phase transition temperature and enhancing the probability of interionic energy transfer, respectively. Notably, the temperature ranges corresponding to the maximum <em>S</em>_<em>R</em> for the ratiometric and lifetime modes were found to be distinct, effectively broadening the thermal operating range of the sensor. Additionally, it was shown that LiYO₂:Nd³⁺, Yb³⁺ can be also used as a temperature sensor through the ratio of luminescence intensities recorded at two distinct time gates. Furthermore, the results confirmed that the phonon-assisted energy transfer process plays a dominant role in shaping the luminescence kinetics, surpassing the influence of the structural phase transition. Overall, this study highlights LiYO₂:Nd³⁺,Yb³⁺ as a promising candidate for multimodal luminescent temperature sensing applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117985"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147385266","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}

{"title":"Electric-field-controlled CVD growth of CsPbBr3 perovskite films for improved photodetection","authors":"Kaitao Chen ,&nbsp;Zewen Lin ,&nbsp;Rui Huang ,&nbsp;Jie Song ,&nbsp;Haixia Wu ,&nbsp;Li Xia ,&nbsp;Zhenxu Lin ,&nbsp;Yi Zhang ,&nbsp;Hongliang Li ,&nbsp;Yanqing Guo ,&nbsp;Huihong Lin ,&nbsp;Yandan Wu ,&nbsp;Danqing Liu ,&nbsp;Youming Lu ,&nbsp;Paul K. Chu","doi":"10.1016/j.optmat.2026.117982","DOIUrl":"10.1016/j.optmat.2026.117982","url":null,"abstract":"<div><div>Uncontrolled crystallization of halide perovskites during chemical vapor deposition (CVD) remains a critical barrier to producing high-performance perovskite films for optoelectronics. Herein, an external electric field is introduced during CVD to precisely regulate CsPbBr₃ film growth. Electric-field-assisted growth leads to suppressed instantaneous supersaturation, elevated nucleation energy barriers, and reduced nucleation density, resulting in the formation of uniform, compact films with significantly enlarged grain sizes. These structural improvements yield a lower trap density, enhanced carrier mobility, and reduced non-radiative recombination compared to the untreated samples. Photodetectors constructed with the optimized films have substantially better optoelectronic properties, manifested by a responsivity of about 62 A/W, a specific detectivity surpassing 10¹² Jones, and a broad linear dynamic range of 118 dB. Moreover, they show a −3 dB bandwidth of ∼250 Hz and significantly faster response time, outperforming devices without electric field assistance. The results reveal a scalable and effective strategy to tailor perovskite crystallization by electric field engineering, enabling the fabrication of high-performance optoelectronic devices.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117982"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147385377","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}

{"title":"Investigation of luminescence characteristics of Tm3+ doped lithium borate (LiBO2): A first study","authors":"Tuana Karakoyun Barandır ,&nbsp;Arzu Ege ,&nbsp;Levent Türkler","doi":"10.1016/j.optmat.2026.117961","DOIUrl":"10.1016/j.optmat.2026.117961","url":null,"abstract":"<div><div>Thulium-doped lithium borate (LiBO₂:Tm³⁺) phosphors were synthesized for the first time via a conventional solid-state reaction method. The structural and luminescence characteristics of the synthesized materials were investigated using X-ray diffraction (XRD), thermoluminescence (TL), and photoluminescence (PL) techniques. XRD patterns confirmed a well-crystallized host lattice, demonstrating that the crystalline structure remained stable upon Tm³⁺ substitution. The TL glow curves exhibited distinct overlapping peaks, indicating the presence of efficient trapping and recombination centers that are suitable for dosimetric applications. The kinetic parameters, including the activation energy (E), frequency factor (s), and kinetic order (b), were recorded using glow curve deconvolution based on the General-Order Kinetics (GOK) model. PL measurements under laser excitation revealed intense blue-to-green emissions in the 380-680 nm range, attributed to the characteristic intra-4f transitions of Tm³⁺ ions, specifically the ¹D₂ <span><math><mrow><mo>→</mo></mrow></math></span> ³H₆ and ¹G₄ <span><math><mrow><mo>→</mo></mrow></math></span> ³F₄ transitions. The spectral characteristics underscore the strong crystal field effects and high emission purity. These findings highlight that Tm³⁺-doped lithium borate phosphors combine robust structural integrity with superior luminescent and dosimetric performance, demonstrating their significant potential for environmental radiation dosimetry applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117961"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147385385","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}

{"title":"Laser-programmable wettability on porous silicon visualized by photoacoustic microscopy","authors":"Taiyu Su ,&nbsp;Guo Chen ,&nbsp;Pengbo He ,&nbsp;Ke Zhang ,&nbsp;Yuchen Ai ,&nbsp;Sung-Liang Chen ,&nbsp;Chang-Ching Tu","doi":"10.1016/j.optmat.2026.117971","DOIUrl":"10.1016/j.optmat.2026.117971","url":null,"abstract":"<div><div>This work introduces a novel, mask-free approach to achieve programmable wettability control on porous silicon (PSi) through laser writing, with the process visualized by optical-resolution photoacoustic microscopy (OR-PAM). Unlike conventional lithography methods, this approach enables direct, site-specific conversion of hydrophobic PSi into hydrophilic regions with micrometer precision. Hydrophobic PSi was first fabricated via electrochemical etching and 1-octene hydrosilylation, forming hierarchical porous structures terminated with alkyl chains. Focused nanosecond pulsed laser irradiation locally ablated and oxidized the porous layer, disrupting surface alkyl termination and allowing water infiltration into the irradiated pores—thus realizing a controllable hydrophobic-to-hydrophilic transition. The wettability modification was quantitatively analyzed by water contact angle and photoacoustic (PA) imaging, visualizing a minimum line width of 40 μm. Leveraging the preserved photoluminescence (PL) of PSi, laser-defined hydrophilic wells were employed as miniaturized biochemical reactors for protein detection. A new PL quenching–based bioassay achieved a detection limit of 96.5 ng/mL for HRP–streptavidin without labeling or complex instrumentation. Moreover, interconnected laser-written hydrophilic channels demonstrated open-surface microfluidic diffusion and mixing. This study pioneers a direct, optically programmable platform that unifies laser patterning, PA imaging, and PL sensing on PSi—offering an innovative route toward next-generation lab-on-a-chip systems.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117971"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147385390","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}

{"title":"Blue-to-white light generation using rare-earth dopants and magnesium phosphate glass host interaction","authors":"Vivek gupta ,&nbsp;Santosh Kumar ,&nbsp;S.K. Arya ,&nbsp;R.K. Mishra ,&nbsp;K. Singh","doi":"10.1016/j.optmat.2026.117898","DOIUrl":"10.1016/j.optmat.2026.117898","url":null,"abstract":"&lt;div&gt;&lt;div&gt;A series of rare-earth (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Re&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Pr&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Sm&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Eu&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Dy&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) containing &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mi&gt;MgO&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Na&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Li&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;TiO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; glasses were synthesised via the melt-quenching technique to investigate changes in structural and optical properties with ionic radii and electronegativity variations. X-ray diffraction confirmed the amorphous nature of the glass matrix, while Fourier Transform Infrared (FTIR) spectroscopy revealed the influence of different rare-earth oxides on the phosphate network structure. Optical absorption analysis showed that the optical band gap energy increases up to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Eu&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; content, correlating with changes in the localised state tails. Photoluminescence studies demonstrated tunable emission characteristics; the CIE 1931 coordinates shifted from the greenish-blue towards the white region as the ionic radii decreased. The &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Dy&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; doped glass achieves near-white light emission (colour purity &lt;span&gt;&lt;math&gt;&lt;mo&gt;∼&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt; 2%). The correlated colour temperature (CCT) was highly dependent on the chemical nature of the dopant, ranging from warm white light (1687 K for &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Sm&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) to cool daylight (5721-6465 K for &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Pr&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Dy&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117898"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025519","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}

{"title":"Ultrasound–assisted green synthesis of bismuth ferrite sillenite: Potential for near infra-red reflective nanopigment","authors":"Arvia Arvia ,&nbsp;Iis Nurhasanah ,&nbsp;Nor Basid Adiwibawa Prasetya","doi":"10.1016/j.optmat.2026.117901","DOIUrl":"10.1016/j.optmat.2026.117901","url":null,"abstract":"<div><div>This study investigates the potential for ultrasound-assisted green synthesis of bismuth ferrite as a near-infrared reflective nanopigment. <em>Clitoria ternatea</em> flower extract was used in synthesizing bismuth ferrite by controlling calcination temperatures. The unique properties of <em>Clitoria ternatea</em> extract, such as its high antioxidant content and the carefully controlled calcination temperature, were found to play an important role in the crystallization of sillenite bismuth ferrite. X-ray diffraction confirmed the complete formation of the sillenite bismuth ferrite phase at 600 °C. Transmission electron microscopy and zeta potential measurements showed a highly dispersed and uniform nanostructure of sillenite bismuth ferrite. The potential of sillenite bismuth ferrite as a nanopigment is clear in its pale yellow colour, which demonstrates excellent chromatic stability and a remarkably high near-infrared reflectance. These findings highlight the advanced and eco-sustainable nature of the near-infrared reflective coatings, which are made possible by the synergistic role of the synthesis method and nanopigment.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117901"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025522","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}

{"title":"Defect passivation with tert-substituted organic materials for high efficiency perovskite solar cells","authors":"Haoyi Zhang ,&nbsp;Chaoqun Zhang ,&nbsp;Xuediao Cai ,&nbsp;Fei Gao ,&nbsp;Shengzhong (Frank) Liu","doi":"10.1016/j.optmat.2026.117954","DOIUrl":"10.1016/j.optmat.2026.117954","url":null,"abstract":"<div><div>Perovskite solar cells (PSCs) have witnessed rapid development in their power conversion efficiency (PCE) in recent times. However, defects on the perovskite film surface or grain boundary could lead to performance degradation in terms of the stability and efficiency of PSCs. In the present study, an organic <em>tert</em>-substituted aromatic compound with multifunctional groups of 4-Chloro-2-fluoro-6-iodoaniline (CFI) was introduced into perovskite films to achieve defect passivation on the film surface. In comparison to untreated perovskites, CFI-treated perovskites exhibited a smooth surface with lower defect density and non-radiative recombination within perovskite. This resulted in enhanced <em>V</em>_<em>oc</em> and <em>FF,</em> consequently, the PCE of the planar PSC is improved from 22.52% to 24.26%. Furthermore, the environmental stability of PSCs is also enhanced. Therefore, surface passivation with organic compound containing multifunctional groups could serve as an effective strategy for defect passivating to improve the performance of PSCs.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117954"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384686","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}

{"title":"Impacts of SiH4 molar flow rate on structural and electrical properties of high-Al-composition semi-polar n-AlGaN epi-layers","authors":"Shijie Chen ,&nbsp;Liang Li ,&nbsp;Zhifeng Yang ,&nbsp;Xiaoting Shen ,&nbsp;Xiong Zhang","doi":"10.1016/j.optmat.2026.118001","DOIUrl":"10.1016/j.optmat.2026.118001","url":null,"abstract":"<div><div>The impacts of SiH₄ molar flow rates on the structural and electrical characteristics of Si-doped high-Al-composition semi-polar [11_22]-oriented n-AlGaN epi-layers grown with metal organic chemical vapor deposition technology were systematically investigated. It was revealed that the incorporation of Si atoms was effective to significantly enhance the migration capability of Al and Ga atoms within the semi-polar n-AlGaN epi-layers, which was beneficial to the formation of a smooth surface morphology. In fact, a root-mean-square surface roughness as small as 1.16 nm was achieved for the [11_22]-oriented n-AlGaN epi-layer which was grown at an optimal SiH₄ molar flow rate of 9.52 nmol/min. Furthermore, it was found that when group-III atoms were substituted by Si atoms during the doping process, tilt and mergence of misfit dislocations could be induced by the discrepancy in atomic radius between Si and group-III atoms, resulting in a substantial enhancement in the crystalline integrity for the [11_22]-oriented n-AlGaN epi-layers. Moreover, the increase in the incorporation efficiency of Si atoms was verified to be effective to reduce the ionization energy which was dependent on the electrostatic potential of electrons near Si donor sites, leading to an increase in electron concentration up to 8.40 × 10¹⁸ cm⁻³ for the [11_22]-oriented n-AlGaN epi-layer with an Al composition as high as 63%.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 118001"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384773","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}

{"title":"Detection of oxytetracycline residues in milk based on the fluorescence quenching effect of AgInS2/ZnS quantum dots","authors":"Jie Chen,&nbsp;Lijiao Sun,&nbsp;Xiaoyun Pu,&nbsp;Kezhen Qi,&nbsp;Ya Yan","doi":"10.1016/j.optmat.2026.117927","DOIUrl":"10.1016/j.optmat.2026.117927","url":null,"abstract":"<div><div>Water-dispersed ZnS-coated AgInS₂ quantum dots (AIS/ZnS QDs) were synthesized via a one-pot aqueous method, and their crystal structure, surface composition, morphology and optical properties were systematically characterized. Based on the fluorescence quenching effect of AIS/ZnS QDs toward oxytetracycline (OTC), a fluorescence spectrophotometric method was established for OTC detection in milk. Under optimal conditions (QDs preparation at pH 5.5, detection temperature of 20 °C, and detection concentration of 0.160 g/L, with a 25 min reaction time), the relative fluorescence quenching degree (ΔF/F₀) showed a good linear correlation with logC (OTC concentration), with a linear equation of ΔF/F₀ = 0.2933 logC + 2.3388 (R² = 0.9984), a linear range of 1.22 × 10⁻⁸ to 2.5 × 10⁻⁵ mol/L and a detection limit of 1.82 × 10⁻⁹ mol/L. The spiked recoveries of OTC in milk were 96.9%–107.1%. Furthermore, the possible quenching mechanism was proposed. This work offers insights into AIS-based functional material synthesis and expands their applications in fluorescence analysis.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117927"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384785","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}

{"title":"Cr3+ doped NaYF4:Er3+/Yb3+ robust green luminescent upconversion nanophosphors for temperature sensing and photonic applications","authors":"Shouvik Choudhury ,&nbsp;Shruti Narayanan ,&nbsp;Debojyoti Ray Chawdhury ,&nbsp;Prem B. Bisht","doi":"10.1016/j.optmat.2026.117922","DOIUrl":"10.1016/j.optmat.2026.117922","url":null,"abstract":"<div><div>Upconversion nanophosphors are synthesized by Er³⁺ (1 %)/Yb³⁺ (40 %) co-doping of hexagonal NaYF₄ in the presence of a transition metal ion Cr³⁺ by hydrothermal method. Cr³⁺ ion concentration was systematically increased in steps of 5 % (0–20 %) to study the effect of doping concentration. X-ray diffraction study confirmed the formation of the hexagonal phase for the nanophosphors. X-ray photoelectron spectroscopy study showed successful rare earth and Cr³⁺ ion doping into the lattice. An order of magnitude enhancement of green luminescence was observed upon doping the systems with Cr³⁺ ions. The photoluminescence (PL) intensity shows maximum at 15 % Cr³⁺ doping. Temperature dependent PL study indicates its high sensitivity. The colour purity of the system is found to be 97 %. Nonlinear optical studies showed the manifestation of reverse saturable absorption phenomenon owing to the sequential multiphoton absorption and energy transfer mechanism. This phenomenon is useful in imaging applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"174 ","pages":"Article 117922"},"PeriodicalIF":4.2,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147385154","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}