Journal of Luminescence最新文献

{"title":"Ultrafast energy transfer between all-inorganic tin-based perovskite nanocrystals and RhB chromophore","authors":"Zhaoyong Jiao,&nbsp;Zhiheng Shang,&nbsp;Minghuan Cui,&nbsp;Shuwen Zheng,&nbsp;Pan Song,&nbsp;Haiying Wang,&nbsp;Jicai Zhang,&nbsp;Jian Song,&nbsp;Shuhong Ma,&nbsp;Guangrui Jia,&nbsp;Zhongpo Zhou,&nbsp;Chaochao Qin","doi":"10.1016/j.jlumin.2025.121383","DOIUrl":"10.1016/j.jlumin.2025.121383","url":null,"abstract":"<div><div>This study explores the energy transfer mechanisms through visible-light excitation of hybrids based on CsSnBr₃ nanocrystals and Rhodamine B (RhB) chromophores. The ability of RhB dyes to donate energy to CsSnBr₃ is comprehensively investigated with steady-state and time-resolved photoluminescence, as well as femtosecond transient absorption spectroscopy. The Förster resonance energy transfer (FRET) dominates (85.1 %) the photosensitization of the singlet excited state of RhB in the nanocrystal-chromophore hybrids with a rate constant of 4.3 × 10⁹ s⁻¹. These findings reveal the energy transfer mechanism and highlight the design of light-harvesting devices based on CsSnBr₃ nanocrystals and organic chromophores.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121383"},"PeriodicalIF":3.3,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient near-infrared emission and imaging of lead-free double perovskite Cs2TeCl6 by Mo4+ doping","authors":"Chao Wang ,&nbsp;Junlin Wang ,&nbsp;Dongting Wang ,&nbsp;Linli He","doi":"10.1016/j.jlumin.2025.121381","DOIUrl":"10.1016/j.jlumin.2025.121381","url":null,"abstract":"<div><div>In this work, we successfully synthesized a novel lead-free perovskite material Cs₂TeCl₆: xMo⁴⁺(x = 0.02,0.06,0.1,0.2) and conducted in-depth research on its near-infrared emission characteristics. The morphology of the material was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results confirmed that the synthesized Cs₂TeCl₆: xMo⁴⁺ exhibited excellent crystallinity and high phase purity. And it exhibits efficient luminescence performance in the near-infrared region, with a maximum emission wavelength of 900 nm and a full width at half maximum of 100 nm. The photoluminescence quantum yield (PLQY) in the near-infrared region (750–1100 nm) measured at an excitation wavelength of 450 nm is as high as 29 %. The temperature-dependent (80–480K) near-infrared PL spectra also exhibit good thermal stability at low and high temperatures. Near infrared phosphor converted LEDs (pc-LEDs) made from this material exhibit excellent stability in the range of 100 mÃ500 mA. The pc-LEDs based on Cs₂TeCl₆: 0.1Mo⁴⁺ material exhibit efficient near-infrared emission in the near-infrared region, demonstrating excellent performance in applications such as venous photography, night vision and drug impurity detection. In addition, the excellent performance of this material not only provides new insights for the application of perovskite materials in near-infrared luminescence, but also provides important theoretical and experimental basis for the development of new and efficient near-infrared luminescent materials.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121381"},"PeriodicalIF":3.3,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photoluminescence characteristics and Judd–Ofelt analysis of YBa3(BO3)3:Tb3+ phosphors co-doped with Li+, Na+, and K+","authors":"Abeer S. Altowyan ,&nbsp;U.H. Kaynar ,&nbsp;Cem Gök ,&nbsp;H. Aydin ,&nbsp;Jabir Hakami ,&nbsp;M.B. Coban ,&nbsp;A. Canimoglu ,&nbsp;N. Can","doi":"10.1016/j.jlumin.2025.121380","DOIUrl":"10.1016/j.jlumin.2025.121380","url":null,"abstract":"<div><div>This study presents a systematic investigation of the photoluminescent properties of Tb³⁺-doped YBa₃(BO₃)₃ (YBBO) phosphors, synthesized via a microwave-assisted sol-gel combustion (MA-SG) method and co-doped with monovalent alkali ions (Li⁺, Na⁺, K⁺). Structural, vibrational, and morphological analyses were performed using XRD with Rietveld refinement, Raman and FTIR spectroscopy, and SEM–EDS. These analyses confirmed the successful incorporation of dopants without compromising the borate lattice. Photoluminescence (PL) measurements under near-UV excitation (377 nm) showed intense green emission attributed to the ⁵D₄ → ⁷F₅ transition of Tb³⁺, with Li⁺ co-doping producing the greatest enhancement (∼2.7 × ) in emission intensity. Lifetime measurements revealed longer decay times with co-doping, suggesting reduced non-radiative relaxation processes. Judd–Ofelt (J–O) analysis confirmed strong radiative transitions and high internal quantum efficiency (η ≈ 48.4 %). The internal quantum efficiency (IQE) of 48.4 % was estimated using Judd–Ofelt theory, which is based on radiative transition probabilities derived from emission spectra. This method, while theoretical, is widely accepted for powdered phosphors and provides insight into the intrinsic radiative efficiency of the activator ions. Although absolute quantum yield (QY) measurements are typically obtained using integrating sphere systems to account for all optical losses, in this study, such measurements were not performed. Nonetheless, the strong agreement between radiative parameters and observed photoluminescence behavior supports the reliability of the calculated efficiency. In this study, J–O parameters were derived from the integrated emission spectra of Tb³⁺ transitions, following an emission-based approach that has been increasingly employed for powdered phosphors due to its experimental feasibility. Colorimetric analysis using CIE chromaticity diagrams validated the tunable green emission behaviour of the phosphors. Minor deviations from ideal green were linked to background blue emission from the host matrix, a feature that may offer spectral advantages in multifunctional optical applications. Furthermore, the phosphor exhibited a rare negative thermal quenching (NTQ) behavior, maintaining or enhancing emission intensity up to 550 K, which is superior to many commercial green phosphors.These results highlight the crucial role of alkali ion co-doping in tuning the local crystal field, enhancing emission efficiency, and paving the way for the development of efficient green-emitting phosphors for solid-state lighting applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121380"},"PeriodicalIF":3.3,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-precision machine learning analysis of photoluminescence and I-V measurements in SiNWs-based Schottky diodes","authors":"Radhouane Laajimi ,&nbsp;Kawther Laajimi ,&nbsp;Mehdi Rahmani","doi":"10.1016/j.jlumin.2025.121379","DOIUrl":"10.1016/j.jlumin.2025.121379","url":null,"abstract":"<div><div>Silicon nanowires (SiNWs) structures were obtained by Ag-assisted chemical etching (Ag-ACE) method for different etching durations (d_etch). Ag/SiNWs form Schottky barriers and are highly sensitive to surface states, which make them excellent for photodetectors Schottky diodes. Mathematical (MT) and decision tree (DT) algorithms were used to predict and analyze the photoluminescence (PL) intensity and current-voltage (I-V) characteristics of Ag/SiNWs/Si junctions as a function of d_etch. The developed models were validated using experimental measurements. A comparative analysis based on statistical evaluation criteria was also carried out. The MT model shows outstanding performance. This model based on a 7th-order Gaussian function was trained to analyze the PL curves at times of 30, 90, and 300 s. It achieves a MSE of 1.47 × 10⁻⁹, a MAE of 2.9 × 10⁻⁵, a RMSE of 3.8 10⁻⁵, and an R² of 0.9988 for d_etch of 300 s. For the prediction of I-V characteristics, the mathematical model based on a 9th generation polynomial function was trained at the same etching times. For d_etch equal to 300 s, this model achieves an MSE of 1.00 10⁻¹⁴, an MAE of 8.34 × 10⁻⁸, an RMSE of 1.00 × 10⁻⁷, and an R² value of 0.9998, demonstrating its high predictive accuracy for this time. The obtained results demonstrate superior capabilities of the mathematical models and highlight the performance of the applicability of machine learning to the validation of opto-electrical experimental data of SiNWs-based Schottky diode.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121379"},"PeriodicalIF":3.3,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatiotemporal control of upconversion luminescence through vacancy-induced local structure engineering","authors":"Xiaojia Su ,&nbsp;Xuan Liu ,&nbsp;Jingru Lai ,&nbsp;Yu Yuan ,&nbsp;Xiaoli Shi ,&nbsp;Mingye Ding","doi":"10.1016/j.jlumin.2025.121376","DOIUrl":"10.1016/j.jlumin.2025.121376","url":null,"abstract":"<div><div>The escalating proliferation of counterfeit commodities in global markets has emerged as a critical socioeconomic challenge, driving urgent demands for advanced anti-counterfeiting technologies with enhanced security and practicability. Lanthanide-doped upconversion nanoparticles (UCNPs) have demonstrated exceptional potential in fluorescent anti-counterfeiting applications due to their unique anti-Stokes emission characteristics and near-infrared (NIR) excitation capability. Despite significant progress, current multicolor modulation strategies face fundamental limitations including complex doping architectures, inefficient energy transfer, and reliance on multiple excitation wavelengths. This study addresses these challenges through a novel crystal field engineering approach to achieve excitation-responsive color tuning in a simplified single-activator system. We developed a cubic-phase Na_0.5YbF_3.5:Er/Y@CaF₂:Yb nanostructure through precise local crystal field modulation, where strategic adjustment of Na⁺/F⁻ molar ratios enables remarkable enhancement of red-to-green emission ratios compared to conventional counterparts. The engineered CaF₂:Yb sensitization shell effectively suppresses surface-related quenching, resulting in UC enhancement. Crucially, the optimized system demonstrates unprecedented excitation-dependent chromatic switching between green and red emissions through simple laser pulse width modulation under single 980 nm excitation. The unique luminescent properties enable the designed nanocrystals exhibit promising in advanced anti-counterfeiting application. These findings not only overcome existing limitations in multicolor UCNP engineering but also provide fundamental insights into excitation-selective energy transfer mechanisms, with potential extensions to information security and high-resolution bioimaging applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121376"},"PeriodicalIF":3.3,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impacts of varied roughness in n-AlGaN surface for the optoelectronic performance of AlGaN based ultraviolet Mini-LEDs","authors":"Shirui Cai ,&nbsp;Zhangwei Li ,&nbsp;Lijie Zheng ,&nbsp;Hongli Qiu ,&nbsp;Yuxuan Liu ,&nbsp;Zongmin Lin ,&nbsp;Yuhan Su ,&nbsp;Shouqiang Lai ,&nbsp;Tingzhu Wu","doi":"10.1016/j.jlumin.2025.121377","DOIUrl":"10.1016/j.jlumin.2025.121377","url":null,"abstract":"<div><div>In this work, 300 × 300 μm² AlGaN-based ultraviolet (UV) Mini-LEDs were fabricated on c-plane sapphire substrates. After removing the sapphire substrate and AlN buffer layer using the laser lift-off (LLO) technique, the exposed n-AlGaN surfaces were roughened through chemical etching with varying durations, resulting in four types of UV Mini-LEDs with different n-AlGaN surface roughness levels. The surface roughness of these n-AlGaN layers was characterized by using the scanning electron microscope (SEM) and atomic force microscopy (AFM) measurement. Electro-optical measurements demonstrated that surface roughening improved both the light extraction efficiency (LEE) and external quantum efficiency (EQE) of the UV Mini-LEDs. To further explore the physical mechanisms underlying the LEE enhancement in devices with varied surface roughness levels, the finite-difference time-domain (FDTD) simulations were adopted. Additionally, the results of surface temperature distribution also indicated that the increased surface roughness could improve the thermal performance of devices. Notably, prolonged roughening treatment duration was observed to adversely affect the forward voltage characteristics of Mini-LEDs, indicating the necessity for proper surface roughening processes to balance luminous efficiency and electrical performance during device fabrication.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121377"},"PeriodicalIF":3.3,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical properties of porphyrin aluminum metal-organic frameworks by “conventional” and synchronous luminescence spectroscopy, and effect of sorption of diethyl sulfide","authors":"Mohammad Shahwaz Ahmad,&nbsp;Alexander Samokhvalov","doi":"10.1016/j.jlumin.2025.121375","DOIUrl":"10.1016/j.jlumin.2025.121375","url":null,"abstract":"<div><div>Metal-organic frameworks (MOFs) are advanced structured coordination polymers that contain metals and organic linkers and feature interesting optical properties. Particularly, MOFs with linkers of complex structure, which absorb and emit light in the optical range, are promising for opto-electronics, chemo-sensing toxic vapors and liquids, sorption-based removal of hazardous compounds, and beyond. Here, we report studies of optical properties of two porphyrin MOFs using “conventional” excitation-emission matrix (EEM) spectra, from the near-UV through visible and into the near-infrared (NIR) range. Namely, the porphyrin aluminum MOF without metal in the porphyrin ring, compound 2 actAl-MOF-TCPPH₂ absorbs light in the near-UV range due to the Soret band and, additionally, throughout the visible range. Its photoluminescence (PL) occurs in the NIR range via the purely electronic Q(0-0) and the first vibronic Q(0–1) bands. Further, the related compound 4 actAl-MOF-TCPPCu with Cu²⁺ cation in the porphyrin ring exhibits a strong, a factor 50 quenching of the PL signal, due to the paramagnetic copper cation. Nevertheless, it shows the characteristic emission via both the Q(0-0) and Q(0–1) bands. Further, compound 4 adsorbs vapor of volatile organic sulfur compound diethyl sulfide (DES), forming the stoichiometric absorption complex. Binding DES to the metalloporphyrin ring in this complex is detected based on the EEM spectra. Next, the common drawbacks of the EEM spectra, e.g. wide and overlapping emission bands and peaks due to diffraction grating artifact, have been overcome by the advanced method. Namely, the solid-state synchronous luminescence spectroscopy (SS-SLS) allows to successfully resolve both Q-bands in these MOFs and remove spectral artifacts. Additionally, the SS-SLS allows to get insight into the origin of an additional NIR emission band due to the interaction of each compound with molecular oxygen. For both porphyrin MOFs, the comprehensive scheme of optical (absorption and emission) transitions was obtained which includes the Soret band, two Q-bands, and the emission band involving oxygen.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121375"},"PeriodicalIF":3.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical spectroscopy study of damage induced in nitrogen-doped 6H-SiC by neutron irradiation","authors":"Xin Li ,&nbsp;Xinyue Yan ,&nbsp;Defeng Liu ,&nbsp;Xujie Hao ,&nbsp;Quangui Zhang ,&nbsp;Fei Zhu ,&nbsp;Cuihong Wang ,&nbsp;Hongfei Liu ,&nbsp;Rongyun Jiang ,&nbsp;Shouchao Zhang","doi":"10.1016/j.jlumin.2025.121373","DOIUrl":"10.1016/j.jlumin.2025.121373","url":null,"abstract":"<div><div>This study examines the effects of neutron irradiation on nitrogen-doped 6H-SiC single crystals (<em>N</em>_<em>D</em> ≈ 3.0 × 10¹⁹ cm⁻³), focusing on defect formation, recovery, and optical properties. Neutron irradiation with a fluence of 1.27 × 10²¹ n/cm² was followed by annealing from room temperature to 1650 °C. X-ray diffraction, UV–visible near-infrared absorption, and Raman spectroscopy were used to analyze changes in lattice structure, bandgap, and light absorption. Raman spectroscopy provided insights into chemical disorder and recovery mechanisms. The N_CV_Si configuration was identified as a key contributor to photoluminescence and defect energy levels. A four-stage recovery process was observed in Raman spectra, with varying contributions of Frenkel defects, interstitials, and vacancy types at different temperatures. Additionally, a novel defect-induced optical rotation effect was discovered due to radiation-mediated symmetry breaking, highlighting the impact of neutron irradiation on optical properties. This research offers a deeper understanding of defect recovery and optical effects in irradiated SiC materials and establishes 6H-SiC as a critical benchmark for radiation damage mechanisms in SiC polytypes.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121373"},"PeriodicalIF":3.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144469906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Near-unity quantum efficiency and remarkable anti-thermal quenching of Cr3+-activated Gd3AlGa4O12 garnet emitter for advanced broadband NIR light source","authors":"Di Qian ,&nbsp;Yahong Jin ,&nbsp;Haoyi Wu ,&nbsp;Yihua Hu","doi":"10.1016/j.jlumin.2025.121378","DOIUrl":"10.1016/j.jlumin.2025.121378","url":null,"abstract":"<div><div>Advances in broadband near-infrared (NIR) emitting materials represent a pivotal frontier for next-generation intelligent NIR phosphor-converted light-emitting diode (pc-LED) technologies. However, practical implementation of these materials has been constrained by challenges such as suboptimal quantum efficiency (QE) and pronounced thermal quenching (TQ). In this study, we report the synthesis and comprehensive characterization of broadband NIR-emitting phosphors, Gd₃AlGa₄O₁₂:Cr³⁺, exhibiting anti-TQ properties without compromising QE. The material's inherent structural rigidity, wide bandgap, and the minimal electron-phonon coupling (EPC) effect provide a foundation for high-performance broadband NIR luminescence. Strategic optimization of Cr³⁺ doping concentrations, combined with controlled excited-state electron migration, achieves an internal quantum efficiency (IQE) of 98.23 % and a remarkable anti-TQ capability (135.1 %@483 K). The practical potential is further demonstrated through prototype NIR pc-LED implementation, where integration with a commercial blue LED chip delivers an NIR output power of 285.38 mW at 1170 mA and a wall-plug efficiency (WPE) of 17.42 % at 30 mA, highlighting its potential for use in diverse applications such as plant growth, component analysis, night vision, nondestructive detection, and non-invasive imaging. Overall, this work addresses critical challenges in broadband NIR phosphors and advances the development of high-performance and energy-efficient miniatured broadband NIR light sources.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121378"},"PeriodicalIF":3.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mn-doped Ag2S quantum dots-fluoride hybrid nanostructure for high-sensitivity NIR-II ratiometric thermometry","authors":"Haorui Zhu ,&nbsp;Zhengying Du ,&nbsp;Denghao Li ,&nbsp;Lei Lei ,&nbsp;Gongxun Bai ,&nbsp;Huanping Wang ,&nbsp;Xianghua Zhang ,&nbsp;Shiqing Xu ,&nbsp;Jianrong Qiu","doi":"10.1016/j.jlumin.2025.121374","DOIUrl":"10.1016/j.jlumin.2025.121374","url":null,"abstract":"<div><div>Nanothermometers enable the detection of temperature changes at the microscopic scale, which is crucial for elucidating biological mechanisms and guiding treatment strategies. To address the limited sensitivity of thermally coupled level (TCL)-based nanothermometers, we introduce a defect-engineered NIR-II ratiometric probe by integrating temperature-insensitive NaYF₄:Nd@NaYF₄ core-shell nanocrystals (NPs) with Mn-doped Ag₂S quantum dots (QDs). The Mn²⁺ doping introduces Ag ⁺ vacancies in Ag₂S, enhancing thermal quenching via phonon-assisted nonradiative recombination. The resulting NaYF₄:Nd@NaYF₄-Mn: Ag₂S@SiO₂ nanocomposite exhibits a record-high relative sensitivity of 2.1 % K⁻¹ at 323 K, surpassing our previous work (0.81 % K⁻¹, Du et al., 2024) and TCL-based sensors. Moreover, the SiO₂ matrix not only encapsulates and protects the fluoride nanocrystals and quantum dots but also shields them from aqueous environments, ensuring outstanding luminescence stability. This preparation method provides ideas for the fabrication of other multifunctional composite probes, and the probe also provides new options for biological imaging and temperature detection.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"286 ","pages":"Article 121374"},"PeriodicalIF":3.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}