Journal of Luminescence最新文献

{"title":"Enhanced green and NIR emissions in Yb2Mo4O15:Er3+ via excitation energy confinement for a novel NIR LED with real-time chip temperature monitoring","authors":"Haibin Zhang ,&nbsp;Jiarui Zhao ,&nbsp;Ying Ji,&nbsp;Tao Pang","doi":"10.1016/j.jlumin.2025.121233","DOIUrl":"10.1016/j.jlumin.2025.121233","url":null,"abstract":"<div><div>For upconversion luminescence (UCL), high concentration of Yb³⁺ ions enhance excitation energy absorption but often suffer from significant luminescence quenching due to energy migration among the ions. In this study, we choose Yb₂Mo₄O₁₅:Er³⁺, known for its exceptional UCL efficiency, to investigate the confinement of excitation energy for improved UCL and near-infrared (NIR) emission. Our findings reveal that the incorporation of 10 mol% inert Lu³⁺ confines more excitation energy at sublattice level, resulting in an 4.56-fold increase in green UCL and a 35 % enhancement in NIR luminescence. A simple physical model is employed to understand the relationship between light-induced heating and pump power, and to guide the calibration of temperature sensing. Finally, we propose to design an NIR LED with real-time chip temperature monitoring for night vision lighting.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"282 ","pages":"Article 121233"},"PeriodicalIF":3.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783223","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":"Photophysical properties of Eu3+ in functionalized room-temperature ionic liquids: 1-Butyl-3-Methylimidazolium o-toluate and 1-Butyl-3-Methylimidazolium m-toluate: A fluorescence enhancement study","authors":"V. Shyamala Devi","doi":"10.1016/j.jlumin.2025.121223","DOIUrl":"10.1016/j.jlumin.2025.121223","url":null,"abstract":"<div><div>This study investigates the fluorescence enhancement of Eu³⁺ ions incorporated into two new room-temperature ionic liquids (RTILs), namely 1-Butyl-3-Methylimidazolium <em>o</em>-Toluate and 1-Butyl-3-Methylimidazolium <em>m</em>-Toluate. The fluorescence properties of Eu³⁺, such as emission intensities and lifetimes, were assessed in the presence of these ionic liquids. The enhancement effects are attributed to the ligand sensitization process of Eu³⁺ using RTILs, including their non-quenching environment, which influence the solvation environment and the emission properties of Eu³⁺. The findings offer insights into the potential application of these RTILs in the nanomolar level detection of Eu³⁺ in ionic liquids. The observed lifetime of Eu³⁺ in toluate-based ionic liquids exhibits a significant enhancement compared to its counterpart in aqueous solution, highlighting the potential of these media for improved luminescence performance in sensing applications.</div><div>In this study, we report the synthesis and characterization of newly designed ionic liquids. The synthesis method is detailed, ensuring reproducibility and efficiency. Comprehensive characterization was performed using infrared (IR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and mass spectrometry to confirm the structural integrity and purity of the synthesized compounds.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"282 ","pages":"Article 121223"},"PeriodicalIF":3.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786298","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":"Radiation dose dependence of the Bi3+ luminescence in YPO4","authors":"Y.A. Kuznetsova ,&nbsp;I.N. Ogorodnikov ,&nbsp;D.V. Raikov ,&nbsp;S.A. Kiselev ,&nbsp;V.S. Voynov ,&nbsp;M.A. Mashkovtsev ,&nbsp;D.V. Khionin ,&nbsp;A.V. Chukin ,&nbsp;E.K. Gorodnichiy","doi":"10.1016/j.jlumin.2025.121222","DOIUrl":"10.1016/j.jlumin.2025.121222","url":null,"abstract":"<div><div>The UV persistent phosphors YPO₄:Bi were synthesized using both solid-state reaction and hydrothermal methods. XRD and SEM analyses confirmed the formation of single-phase powders. The solid-state synthesis resulted in ‘large’ particle sizes (1–4 μm), while the hydrothermal synthesis produced ‘small’ particle sizes (30–45 nm). The emission centers providing UV-C and UV-A luminescence under X-ray excitation are single Bi³⁺ ion and Bi³⁺– Bi³⁺ pairs. The highest emission yield was observed for samples with a Bi³⁺ concentration of 0.6 mol.%. An analysis of thermoluminescence glow curves using the general order kinetics model, revealed hole traps with an activation energy of 0.93–1.05 eV and electron traps with an activation energy of 0.75–0.85 eV. The dominant mechanisms for UV-C and UV-A emission involve hole recombination at Bi²⁺ ions and electron recombination at Bi3+– Bi⁴⁺ pairs, respectively. The optimal X-ray irradiation dose is 10–12 Gy. The UV-C and UV-A afterglow curves at room temperature follow the sum of exponential and first-order hyperbola functions, corresponding to electron recombination through the conduction band and hole recombination via tunneling, respectively. The afterglow durations for the solid-state prepared powder are 40 min for UV-A and 10 min for UV-C. The powder synthesized by hydrothermal method shows a significant reduction in intensity of afterglow due to the surface energy losses. Notably, despite the decreased intensity, there is a significant increase in the duration of the tunneling component responsible for UV-C emission, attributed to the reduced average distance between the emission center and the hole trap. Methods for improving the afterglow characteristics of YPO₄:Bi nanoparticles are proposed.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"282 ","pages":"Article 121222"},"PeriodicalIF":3.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786299","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":"Visible and infrared up-conversion emission in Er3+-doped fluorochlorozirconate glasses under 1550 nm and 980 nm excitations","authors":"Cyril Koughia,&nbsp;Safa Kasap","doi":"10.1016/j.jlumin.2025.121219","DOIUrl":"10.1016/j.jlumin.2025.121219","url":null,"abstract":"<div><div>Upconversion (UC) and photoluminescence (PL) measurements were carried out on trivalent erbium (Er³⁺) doped fluorochlorozirconate (FCZ) glasses. The experiments show that neither PL spectra nor PL relaxation times depend on Er³⁺ concentration up to 2 at.%, indicating the absence of clusterization and collective effects. Radiation diffusion was also excluded based on the PL decay lifetime being experimentally the same in powder and bulk samples. Additionally, FCZ:Er³⁺ shows an efficient up-conversion in visible and IR regions under 1550 nm or 980 nm pumping. The intensity of up-converted PL bands versus pumping intensity (<em>G</em>) behavior follows PL ∝ <em>G</em>^<em>n</em> with <em>n</em> varying from 1 to 3 depending on the PL band and pump wavelength and intensity. The observed dependences and variation of <em>n</em> may be interpreted by a model of linear rate equations for seven lower manifolds, approximated by six monolevels. The validity of this approximation is supported by the application of the McCumber theory to the shapes of PL and optical absorption spectra. The present model for the experimental data was also supplemented by using Judd-Ofelt parameters obtained from the absorption spectra on the same set of glasses. It should be emphasized that the model developed in this work provides a self-consistent interpretation of the upconversion experiments at 1550 and 980 nm pumping reported herein.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"282 ","pages":"Article 121219"},"PeriodicalIF":3.3,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792290","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":"Regulating broadband near-infrared luminescence and thermal stability of Cs2AgBiCl6 double perovskite via alkali metal ions doping","authors":"Jingjing Liu ,&nbsp;Jianwu Wei ,&nbsp;Peican Chen ,&nbsp;Binbin Luo ,&nbsp;Liya Zhou ,&nbsp;Jie Tian ,&nbsp;Jiahong Pan ,&nbsp;Alexei V. Emeline ,&nbsp;Qi Pang","doi":"10.1016/j.jlumin.2025.121221","DOIUrl":"10.1016/j.jlumin.2025.121221","url":null,"abstract":"<div><div>Lead-free double perovskites have attracted much attention for their unique optical properties, though achieving efficient broadband near-infrared (NIR) emission with them remains a challenge. In this work, we successfully synthesized a new microcrystalline structure of lead-free double perovskites Cs₂Ag_1-xR_xBiCl₆ (R = Na, K, Rb) using a simple chemical reflux method, achieving NIR emission. Notably, Cs₂Ag_0.7K_0.3BiCl₆ demonstrates a broad emission spectrum spanning from 500 to 1200 nm with a significant half-peak width of 300 nm under 365 nm excitation. This is attributed to the doping of alkali metal ions can break the inherent parity-forbidden transition and induce strong exciton-phonon coupling through lattice distortion. Temperature-dependent photoluminescence spectroscopy and density functional theory calculations analysis reveal that alkali metal ions can enhance the thermal stability of self-trapped exciton emission by reducing exciton-phonon coupling strength. Finally, we demonstrate the promising applications of Cs₂Ag_0.7K_0.3BiCl₆ crystals with broad emission bands for NIR night vision and information encryption. This provides new insights into the realization of near-infrared emission and thermal stability regulation.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"282 ","pages":"Article 121221"},"PeriodicalIF":3.3,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783222","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":"Enhanced red upconversion luminescence in Fe3+-activated NaYF4: Yb, Er nanocrystals for rapid latent fingerprint recognition","authors":"Guangliang Lu,&nbsp;Yiping Zhang,&nbsp;Jianlian Song,&nbsp;Yuhan Jing,&nbsp;Xingyu Li,&nbsp;Rao Qin,&nbsp;Da Biao Zhai,&nbsp;Jiangang Jiang,&nbsp;Yiping Wang,&nbsp;He Wang","doi":"10.1016/j.jlumin.2025.121218","DOIUrl":"10.1016/j.jlumin.2025.121218","url":null,"abstract":"<div><div>Traditional methods for latent fingerprint (LFP) detection often suffer from insufficient contrast and background interference, limiting their effectiveness in forensic applications, particularly in complex environments. This study introduces an innovative approach that combines Fe³⁺-doped NaYF₄:Yb, Er upconversion nanoparticles (UCNPs) with digital image processing technology. By optimizing the Fe³⁺ doping concentration (15 % mmol) and synthesis temperature (220 °C), the red emission intensity at 655 nm was enhanced by 13.96 times compared to undoped samples. The amplified red emission originates from energy transfer of |²F_7/2, ⁴T_1g⟩ (Yb³⁺-Fe³⁺ dimer) to ⁴F_9/2 (Er³⁺) states, coupled with crystalline field symmetry distortion induced by Fe³⁺ codoping. Dynamic studies of ⁴S_3/2 and ⁴F_9/2 states under 980 nm pulsed laser excitation, alongside diffuse reflectance analysis, corroborate the proposed upconversion mechanism. Additionally, The optimized UCNPs demonstrated high biocompatibility and stability, achieving LFP visualization with contrast ratios up to 85.03 % and structural similarity scores exceeding 91.58 % via MATLAB-based digital image processing, a significant improvement over conventional methods. This work establishes a robust, non-toxic LFP detection system with potential applications in forensic science.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"282 ","pages":"Article 121218"},"PeriodicalIF":3.3,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747365","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":"A novel red-emission Ca2LaTiAl3O12:Eu3+ phosphor with garnet structure and high stability for high-CRI white light-emitting devices","authors":"Weihao Ye ,&nbsp;Mi Li ,&nbsp;Shaowei Li ,&nbsp;Jie Luo ,&nbsp;Yingji He ,&nbsp;Yang Lv ,&nbsp;Xiaotang Liu ,&nbsp;Yingliang Liu ,&nbsp;Guangqi Hu","doi":"10.1016/j.jlumin.2025.121217","DOIUrl":"10.1016/j.jlumin.2025.121217","url":null,"abstract":"<div><div>The exploration of highly efficient and stable red-emitting materials is crucial for white light-emitting devices with a high color rendering index (CRI), Eu³⁺-activated phosphors with garnet structures hold significant promise in this regard. In this study, we developed a novel Ca₂LaTiAl₃O₁₂(CLTA):Eu³⁺ red phosphor with high brightness and a photoluminescence quantum yield (PLQY) of 65 % using a one-step solid-state reaction method. This phosphor exhibits excellent photostability, high thermal stability, and impressive fluorescence recovery, indicating its suitability for LED packaging. Utilizing the optimized CLTA:Eu³⁺ which is cost-effective, the fabricated LEDs achieve a high CRI of 91.6 demonstrating strong potential for WLED applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"281 ","pages":"Article 121217"},"PeriodicalIF":3.3,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746630","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":"Microwave-assisted synthesis of up-converting Yb3+/Eu3+ co-doped yttrium oxyfluoride micro/nano particles for white light emission","authors":"Liqin Xiang ,&nbsp;Keyun Li ,&nbsp;Yunxiao Li ,&nbsp;Chaoshun Yang ,&nbsp;Adnan Ahmed ,&nbsp;Xiaopeng Zhao ,&nbsp;Wei Gao","doi":"10.1016/j.jlumin.2025.121216","DOIUrl":"10.1016/j.jlumin.2025.121216","url":null,"abstract":"<div><div>Lanthanide ion-doped up-conversion yttrium oxyfluoride (YOF) materials have wide applications in lighting displays, biological imaging, anticounterfeiting, and more. Traditional wet chemical methods used to prepare YOF are time-consuming and have low reproducibility. Controllable and rapid synthesis of YOF micro- or nanoparticles remains a challenge for advancing their applications. In this work, Eu³⁺ and Yb³⁺ co-doped YOF nanoparticles were synthesized using a microwave-assisted method. The particles exhibited excellent up-conversion photoluminescence properties when excited with a 980 nm laser. The calcination temperature and doping concentration of rare earth elements significantly affect the emission color and intensity, and white color emission can be achieved using a single emitter by tuning the doped ion concentration.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"282 ","pages":"Article 121216"},"PeriodicalIF":3.3,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747364","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-resolution X-ray imaging based on one-dimensional copper-silver-based metal halide scintillators","authors":"Chao Wang ,&nbsp;Jie Feng ,&nbsp;Dongting Wang ,&nbsp;Junlin Wang","doi":"10.1016/j.jlumin.2025.121213","DOIUrl":"10.1016/j.jlumin.2025.121213","url":null,"abstract":"<div><div>In this work, Cs₆Cu₃AgBr₁₀ perovskite was synthesized by hot-injection method. Through a series of structural and morphological characterization techniques, it was shown that the synthesized Cs₆Cu₃AgBr₁₀ perovskite has high purity and good crystal structure. Theoretical calculation shows that Cs₆Cu₃AgBr₁₀ perovskite material has a direct band gap structure, which is advantageous to the separation and transmission of photogenerated carriers, and thus improve the photoelectric conversion efficiency of the material. In addition, the flexible film made based on vacuum filtration has good flexibility, uniformity, and a smooth and dense particulate layer. Imaging systems based on this membrane can achieve a high resolution of more than 19.35 lp/mm, which is one of the highest values reported in the literature. These studies show great potential for practical X-ray imaging applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"281 ","pages":"Article 121213"},"PeriodicalIF":3.3,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738882","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":"Substitution induced solvatochromism behaviour of blue emissive N-aryl pyrazoline derivatives and DFT studies","authors":"Praveena Puthige ,&nbsp;Sarojini B. Kunhanna ,&nbsp;Vishwanath Turukarabettu ,&nbsp;Vinutha V. Salian","doi":"10.1016/j.jlumin.2025.121200","DOIUrl":"10.1016/j.jlumin.2025.121200","url":null,"abstract":"<div><div>In the present investigation, a series of 5-[4-(benzyloxy)phenyl]-3-(thiophen-2-yl)-4,5-dihydro-1<em>H</em>-pyrazole derivatives (<strong>A-E</strong>) were successfully synthesized <em>via</em> the cyclization of (2<em>E</em>)-3-[4-(benzyloxy)phenyl]-1-(thiophen-2-yl)prop-2-en-1-one (<strong>1</strong>) with differently substituted phenyl hydrazine respectively. The substituents on the para position of phenyl ring were methyl (-CH₃), bromine (-Br) cyano (-CN) and nitro (-NO₂) groups, leading to the formation of distinct pyrazoline derivatives. This study highlights the influence of different substituents as well as solvents on the potential physicochemical properties of these synthesized pyrazoline derivatives. To investigate the absorption and emission behaviours of the pyrazoline derivatives in various polar and nonpolar solvents; the solvent-solute interactions were analyzed using the solvent polarity parameter approach and Lipperte-Mataga equation. In polar solvents the compounds <strong>A</strong>-<strong>D</strong> exhibited higher Stokes shifts than nonpolar solvents. So the change in excited state intermolecular interactions such as H-bonding brought changes in dipole moments. These derivatives were evaluated for their fluorescence quantum yield (QY) which exhibited fluorescence emission in blue region, as confirmed by CIE diagram. The QY was also effected by polarity of the solvents as compounds <strong>A</strong>-<strong>D</strong> gave least QY in methanol compared to BuOH. The solid state absorption and emission spectral analysis indicated red shift in the emission spectra than in solvents with highest for compound <strong>E</strong> (-NO₂) which could be accounted for J-aggregation in the solid state. These aggregation patterns changed in solution state. The compound E did not show any emission in the polar solvents due to quenching. Additionally, Density functional theory (DFT) calculations were conducted to evaluate the optimized theoretical molecular geometry and frontier molecular orbital properties of the five synthesized organic molecules indicated their semiconductor behaviour. These results provide an avenue to consider the pyrazoline molecules as excellent luminescent materials.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"281 ","pages":"Article 121200"},"PeriodicalIF":3.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746628","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}