Journal of Luminescence最新文献

{"title":"Explication of the luminescent and optically active RE3+ triply-doped silica phosphate glass films for photonic applications","authors":"P.J. Gracie,&nbsp;D. Geetha","doi":"10.1016/j.jlumin.2024.120922","DOIUrl":"10.1016/j.jlumin.2024.120922","url":null,"abstract":"<div><div>The multi-component silicate glass films triply-doped with Er³⁺/Yb³⁺/Nd³⁺ were fabricated by spin coating technique. X-ray diffraction revealed a cristobalite phase in the glasses doped above 0.6 mol% of Nd³⁺. The transparency of the films increases with the addition of the co-dopant, due to the increase in optical band gap by the Burstein-Moss shift. The high value of the correlated color temperature of the blue emission indicates enhanced visual perception, suggestive of cool blue film lasers. The red emission from upconversion exhibits potentiality for flat display panels. The gain cross-section of the glass with 0.6 mol% of Nd³⁺ was 13.54 <span><math><mrow><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>20</mn></mrow></msup></mrow></math></span> cm² which makes it ideal for NIR film lasers in the S-band region. The Inokuti-Hirayama model predicts luminescence quenching due to dipole-dipole interactions in the glasses co-doped beyond 0.6 mol% of Nd³⁺. The <span><math><mrow><mn>4</mn><msub><mi>F</mi><mrow><mn>9</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>→</mo><mn>4</mn><msub><mi>I</mi><mrow><mn>13</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math></span> transition observed in the films, suggests their suitability for O + E + S band NIR film lasers in telecommunication sectors.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120922"},"PeriodicalIF":3.3,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423549","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":"Nonlinear scintillation effects in the intrinsic luminescence from Sc1.318Y0.655Si1.013O4.987 crystal excited by electrons and γ-quanta","authors":"M.V. Belov ,&nbsp;V.A. Kozlov ,&nbsp;N.V. Pestovskii ,&nbsp;S.Yu. Savinov ,&nbsp;V.S. Tskhay ,&nbsp;V.I. Vlasov ,&nbsp;A.I. Zagumennyi ,&nbsp;Yu.D. Zavartsev ,&nbsp;M.V. Zavertyaev","doi":"10.1016/j.jlumin.2024.120919","DOIUrl":"10.1016/j.jlumin.2024.120919","url":null,"abstract":"<div><div>The spectral and kinetic properties of intrinsic luminescence from (Y₂Sc₁)_0.(3)(Sc)[Si]O₅ crystal are studied. The emission is excited by electrons and <em>γ</em>-quanta. The composition (Y₂Sc₁)_0.(3)(Sc)[Si]O₅ is the congruent one for Sc₂SiO₅-Y₂SiO₅ solid solutions. It is found, that the crystal emits fairly bright intrinsic cathodololuminescence (CL) and radioluminescence (RL) at room temperature. In particular, the light yield of scintillation excited by <em>γ</em>-quanta with the energies of 661.7 keV is of 12000 photons/MeV. An increase in the beam flux by ∼20 times leads to the shift in the maximal CL energy spectral density from 315 to 340 nm and to the decrease in the CL decay time at 415 nm from 1377 ± 3 ns to 1165 ± 1 ns. Simultaneously, the decay time of RL excited by a photoelectron with the energy of 644.7 keV is of 1310 ± 10 ns while a Compton electron with the energy of 477 keV excites RL with the decay time of 1050 ± 10 ns. Also, we observed differences in the CL yield dependencies on the volume-averaged density of electronic excitations (EEs) at different wavelengths. An explanation of the results is given considering the nonlinear scintillation phenomena induced by an interaction between EEs. It is based on a conception that an increase in EE volume density leads to an increase in EEs nonradiative quenching due to these interactions.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120919"},"PeriodicalIF":3.3,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423547","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":"Synthesis of low-dimensional metal halide CsAgCl2 for X-ray scintillation applications","authors":"Heng Guo","doi":"10.1016/j.jlumin.2024.120924","DOIUrl":"10.1016/j.jlumin.2024.120924","url":null,"abstract":"<div><div>Low-dimensional metal halides, which possess efficient luminescent properties, have garnered significant interest in the fields of optoelectronics and radiation detection. This study introduces novel lead-free silver-based metal halide material, CsAgCl₂ microcrystals (MCs). These MCs have a one-dimensional atomic chain structure and a unique [AgCl₅]^4- tetragonal shared triangular configuration. CsAgCl₂ MCs exhibit excellent performance as X-ray scintillators due to their bright broadband yellow emission and fast decay time in the microsecond range. The large Stokes shift of 350 nm is produced by self-trapped exciton emission. In X-ray scintillation applications, CsAgCl₂ MCs demonstrate a high light yield of 13280 photons/MeV and a wide range of linear scintillation response. It is noteworthy that the CsAgCl₂ MCs maintain good stability under both atmospheric conditions and continuous X-ray irradiation. The sample was used in an X-ray imaging screen, which clearly presented the X-ray projection image of a wooden stick. As a result, this research not only contributes to the collection of lead-free metal halide scintillators but also indicates that CsAgCl₂ MCs have a wide range of future applications and potential in areas such as medical imaging, scientific research, and diagnostic and detection technologies.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120924"},"PeriodicalIF":3.3,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423545","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":"Small molecule probes with strong one and two-photon excited fluorescence for bioimaging","authors":"Jinghua Zhang ,&nbsp;Yue Tang ,&nbsp;Qichuan Duan ,&nbsp;Yaling Wang ,&nbsp;Xiaoqiang Tong ,&nbsp;Dongliang Tao ,&nbsp;Rongbao Liao ,&nbsp;Feng Jin ,&nbsp;Kun Yin ,&nbsp;Deqian Huang ,&nbsp;Shangrong Zhang","doi":"10.1016/j.jlumin.2024.120921","DOIUrl":"10.1016/j.jlumin.2024.120921","url":null,"abstract":"<div><div>Two-photon excited fluorescence (TPEF) is widely sought after in bioimaging applications due to its exceptional deep tissue penetration and excellent high spatiotemporal resolution. In this paper, benzothiazole and benzimidazole are linked to N, N-diphenylaniline, respectively, through pyridine vinyl. Two new D-π-A (electron donor-π conjugated bridges-electron acceptor) probes (P1, P2) were designed and synthesized. The molecular structures were completely characterized through FT-IR, ¹H NMR, ¹³C NMR, ESI-MS, and X-ray single crystal diffraction. The probes have good one-photon excited fluorescence and two-photon excited fluorescence. Experimental test results indicate that they can be fluorescence probes for biological imaging of HePG2 and juvenile zebrafish. In addition, the fluorescent probes also have the ability to target and locate cancer cell mitochondria.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120921"},"PeriodicalIF":3.3,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423420","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":"Suzuki-Miyaura coupling reaction: Blue-yellow emitting AIE active dyes for organic electronics","authors":"Reshma J. Pandhare ,&nbsp;Sajeev Chacko ,&nbsp;Rajesh M. Kamble","doi":"10.1016/j.jlumin.2024.120899","DOIUrl":"10.1016/j.jlumin.2024.120899","url":null,"abstract":"<div><div>A series of eight novel donor‒acceptor (D─A) based 2,3-di(thiophen-2-yl)quinoxaline derivatives <strong>2</strong>–<strong>9</strong> were prepared by modulating donor species on quinoxaline core with Palladium catalyzed Suzuki–Miyaura ‘C–C bond’ coupling reaction. The synthesized molecules were fully characterized and studied for impact of D–A interaction on opto-electrochemical properties. Absorption spectra of <strong>2</strong>–<strong>9</strong> display intramolecular charge transfer (ICT) transitions in the range of 388–414 nm. Dyes shows positive solvatochromism and emit in blue‒yellow region with emission maxima 444−550 nm on excitation at their respective ICT maxima in toluene, chloroform, DCM, DMSO and neat solid film. Further, solid state emission was studied for aggregation‒induced emission (AIE) effect in THF–water system due to the nanoparticles formation, as confirmed by FEG‒SEM technique. The HOMO and LUMO energy level for compounds <strong>2</strong>–<strong>9</strong> were measured by cyclic voltammetry and found in the range of −5.15 to −5.94 eV and −2.81 to −3.39 eV. Theoretical studies of molecules were also carried out by using DFT and TD‒DFT calculations. The comparable HOMO and LUMO energy levels with reported ambipolar materials and efficient solid-state emission make synthesized compounds potential candidate for solid state emissive, ambipolar charge transporting materials in organic electronics.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120899"},"PeriodicalIF":3.3,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423544","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":"Spectral analysis and emission properties of Ho3+: YLF in the visible-near infrared band","authors":"Wei Yuan ,&nbsp;Rongbin Dai ,&nbsp;Zheng Zhang ,&nbsp;Xiuji Lin ,&nbsp;Huiying Xu ,&nbsp;Zhiping Cai","doi":"10.1016/j.jlumin.2024.120915","DOIUrl":"10.1016/j.jlumin.2024.120915","url":null,"abstract":"<div><div>In order to study the spectral properties of Ho³⁺:YLiF₄ (Ho³⁺:YLF), we measured the absorption spectra f Ho³⁺:YLF crystal. The experimental and calculated electric dipole line strength are calculated based on Judd-Ofelt theory, so do other spectral parameters. In order to characterize the emission characteristics of energy level, we measured the emission spectra of Ho³⁺:YLF crystal under the pumping of lasers at 450 nm and 640 nm, and the partial emission cross-sections spectra was calculated according to the Fuchtbauer-Ladenburg theory. Moreover, the fluorescence lifetimes of 537 nm, 656 nm, 750 nm, 1195 nm and 1964 nm are measured. As far as we know, the fluorescence lifetime of 1964 nm (∼2 μm) and the emission cross-sections of ∼750 nm and ∼961 nm are confirmed for the first time. This work lays the foundation for the generation of lasing at novel wavelength on Ho³⁺:YLF crystal.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120915"},"PeriodicalIF":3.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142327869","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":"Novel deep-red photoluminescence with extraordinary high luminescence ratio of 5D0−7F4 at 702 nm to 5D0−7F2 at 620 nm in Sr2EuAlO5","authors":"Muhammad Kamran ,&nbsp;Chenglong Xia ,&nbsp;Syeda Duaa Zahra ,&nbsp;Xiao He,&nbsp;Bingyang Zeng,&nbsp;Chunmiao Cui,&nbsp;Jiahui Yang,&nbsp;Xiaoguang Liu,&nbsp;Ling Li","doi":"10.1016/j.jlumin.2024.120913","DOIUrl":"10.1016/j.jlumin.2024.120913","url":null,"abstract":"<div><div>A series of novel red-emitting Sr₂EuAlO₅ phosphors, both undoped and doped with rare earth elements Sm, Ce and Tb ions were synthesized using a solid-state method. The photoluminescent properties were investigated. For the Sr₂EuAlO₅ phosphor, the excitation spectra exhibited a broad charge transfer band ranging from 250 to 360 nm and some sharp peaks ranging from 450 to 550 nm, with the highest sharp peak at 463 nm. The emission spectra showed the red emission in both undoped and doped Sr₂EuAlO₅ phosphors, with the highest peak at 702 nm attributed to ⁵D₀→⁷F₄ transition under different excitation wavelengths of 393 and 463 nm. Doping Tb ions into the host lattice Sr₂EuAlO₅ resulted in an extraordinary ultra-high luminescence ratio of ⁵D₀⁻⁷F₄ at 702 nm to ⁵D₀⁻⁷F₂ at 620 nm, which was approximately three times higher than that of Sr₂EuAlO₅. Ce-doped Sr₂EuAlO₅ phosphors altered the shape of excitation spectra and charge transfer phenomenon was observed, while Sm-doped Sr₂EuAlO₅ significantly enhancing the emission intensity at 702 nm. In this study site preferential occupancy based on bond energy calculations was reported for the first time to theoretically confirm the dopant ion sites. The results indicate that Sm and Tb ions preferentially occupy the Eu1 sites, while Ce ions only occupied the Sr2 positions. The CIE values (x = 0.6311, y = 0.3512) and high color purity of 94.8 % in Sr₂EuAlO₅: 10 % Sm ions indicate its suitability as a red phosphor for WLEDs.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120913"},"PeriodicalIF":3.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359444","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":"Design and synthesis of dicyanoethylene derivatives functionalized with carbazole possessing the properties of obvious aggregation-induced emission and reversible high-contrast mechanofluorochromism","authors":"Juanfang Zhou ,&nbsp;Zimei Zhang ,&nbsp;Meng Li ,&nbsp;Yanpeng Lu ,&nbsp;Defang Xu ,&nbsp;Xingliang Liu","doi":"10.1016/j.jlumin.2024.120918","DOIUrl":"10.1016/j.jlumin.2024.120918","url":null,"abstract":"<div><div>This study devotes to the design, preparation, and examination of two novel D-A structured molecules, designated as <strong>CCEDBF</strong> and <strong>BCCEDBF</strong>, which are derived from carbazole unit, dicyanoethylene segment, and dibenzofuran unit. The distinctive D-A molecular architectures and highly twisted spatial configurations of these compounds facilitate pronounced intramolecular charge transfer (ICT) while also imparting robust solid-state luminescence, exhibiting emission efficiencies of 0.518 and 0.739, respectively, and notable aggregation-induced emission (AIE) with AIE factors of 43 and 30. Significantly, both <strong>CCEDBF</strong> and <strong>BCCEDBF</strong> demonstrate reversible mechanofluorochromic (MFC) behavior characterized by high fluorescence contrast. Mechanical grinding of the initial powders results in a shift in their emission colors, transitioning from green and yellow-green to yellow and orange-red, respectively, alongside a corresponding shift in emission peaks from 525 nm to 536 nm–558 nm and 597 nm. Powder X-ray diffraction (PXRD) examination of the initially synthesized, mechanically processed, and vaporized samples reveals that the observed fluorescence color change is due to a structural transformation between ordered crystalline and disordered amorphous configurations induced by the application of the external force. The red shift in photoluminescence (PL) spectra post-grinding is attributed to a reduced band gap, driven by factors such as extended π-conjugation length, enhanced planar intramolecular charge transfer (PICT) effect, strengthened π-π interactions and exciton coupling, as well as the increase in the orbitals overlap between neighboring molecular. Moreover, the presence or absence of <em>tert</em>-butyl substituents attaching to the 3- and 6-positions of the carbazole units significantly impacts the photophysical properties of these materials.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120918"},"PeriodicalIF":3.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423548","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":"Controllable multicolored optical glass-ceramics based on nanostructure strategies and dopants","authors":"Junyi Wang,&nbsp;Feifei Huang,&nbsp;Guoqing Jiang,&nbsp;Ruoshan Lei,&nbsp;Denghao Li,&nbsp;Shiqing Xu","doi":"10.1016/j.jlumin.2024.120917","DOIUrl":"10.1016/j.jlumin.2024.120917","url":null,"abstract":"<div><div>Novel functional materials that integrate multiple tunable luminescence modes hold significant scientific and application potential. In this study, nanostructure strategies were employed to fabricate a series of microcrystalline glasses doped with rare-earth and transition-metal ions. The crystallization behavior of the nanocrystals (NCs) was revealed through high-resolution transmission electron microscopy (HRTEM), and the photoluminescence spectra of the samples were systematically investigated, demonstrating the achievement of independent and efficient visible light emission. With the further addition of the dopant Mn²⁺, it can occupy different sites to generate efficient energy transfer for ions, effectively improve the luminous efficiency, and changing the Mn²⁺ concentration can achieve a wide tunable color gamut. In addition, by exciting the glass samples with different excitation light sources, tunable emission of both red and blue was achieved. The results demonstrated the significant potential of the experimental samples as new multifunctional materials for optical dynamic anti-counterfeiting applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120917"},"PeriodicalIF":3.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142327866","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":"Influence of d-d transition electrons and thickness variations on the excited-state optical properties: Nonlinear optical characterization of Cr2O3 thin film","authors":"Ammar S. Alattar ,&nbsp;Marzieh Nadafan ,&nbsp;Zahra Dehghani ,&nbsp;Morteza Khashehchi","doi":"10.1016/j.jlumin.2024.120916","DOIUrl":"10.1016/j.jlumin.2024.120916","url":null,"abstract":"<div><div>The structural, morphological, linear, and nonlinear optical properties of Cr₂O₃ thin films with different thicknesses deposited by the thermal deposition, were measured. The structural and morphological parameters of films, determined by XRD, FESEM, and AFM images, are compared to the linear and nonlinear optical characteristics of these media. The bandgap of prepared thin films was obtained from DRS spectra. The electron effective mass (<span><math><mrow><msubsup><mi>m</mi><mi>e</mi><mo>∗</mo></msubsup><mo>/</mo><msub><mi>m</mi><mn>0</mn></msub></mrow></math></span>), linear refractive index (<span><math><mrow><msub><mi>n</mi><mn>0</mn></msub></mrow></math></span>), optical static, and high frequency dielectric constant (<span><math><mrow><msub><mi>ε</mi><mn>0</mn></msub></mrow></math></span> , <span><math><mrow><msub><mi>ε</mi><mi>∞</mi></msub></mrow></math></span>) values were calculated by using the band gap energy values. Increasing the thicknesses of thin films causes to decrease the band gap, an increase RMS, increase the size of nanoparticles and the nonlinear responses of thin films. The high magnitude of n₂, and β belonged to the Cr₂O₃ (300 nm-thickness) in the order of 10⁻⁵ cm²/W, and 10⁻¹ cm/W respectively. The fluctuations in nonlinear responses observed at different thicknesses are attributed to d-d transitions and intraband scattering of equilibrium electrons influenced by laser radiation, as indicated by the nonlinearity data. The considerably elevated refractive non-linearity values in the analyzed film materials suggest their potential for practical applications in optoelectronic devices.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120916"},"PeriodicalIF":3.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359443","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}