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Artykuły w czasopismach na temat „Photon luminescence”

Autor: Grafiati

Data publikacji: 6 września 2023

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1

Petrov, Yu V., O. F. Vyvenko, O. A. Gogina, K. Bolotin, S. Kovalchuk, K. Watanabe i T. Taniguchi. "Cathodoluminescence of carbon-related defects in hexagonal boron nitride". Journal of Physics: Conference Series 2103, nr 1 (1.11.2021): 012065. http://dx.doi.org/10.1088/1742-6596/2103/1/012065.

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Abstract Hexagonal boron nitride is a wide band gap semiconductor exhibiting various luminescence bands in visible and near ultraviolet range, which can be used as single photon source. The luminescence band with zero phonon line at 4.1 eV is commonly ascribed to the carbon impurity introduced during crystal growth. In this paper we provide experimental evidence that carbon-related luminescent centers can be introduced in hBN by local electron irradiation in the chamber of scanning electron microscope at room temperature that can be used as a technique for the nanofabrication of single photon source devices with desired pattern.

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Тютрин, А. А., Д. С. Глазунов, А. Л. Ракевич i Е. Ф. Мартынович. "Формирование тонкого люминесцирующего слоя в кристаллах LiF под действием излучения тлеющего разряда". Письма в журнал технической физики 44, nr 15 (2018): 12. http://dx.doi.org/10.21883/pjtf.2018.15.46435.17145.

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AbstractThe formation of thin layers of luminescent defects on the faces of planar lithium fluoride crystals located in the positive column and Faraday dark space of a glow gas discharge was studied by time-resolved confocal scanning luminescent microscopy and time-correlated single photon counting. The formation of aggregated color centers in the surface layers of crystals was established using the spectral and kinetic characteristics of luminescence appearing after irradiation. The role of gas discharge electrons, ions, and photons in the defect formation mechanism was considered. The defects were shown to be formed under the influence of vacuum ultraviolet (VUV) photons. The VUV radiation intensity distribution in the discharge gap was measured by the method of thermostimulated luminescence. The main source of this radiation was the anodic and cathodic voltage drop regions in a glow discharge.

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3

Yamshchikov, V. M. "Influence of a Scattering Medium Consisting of Potassium Atoms on the Luminescent Signal Decay Time: Theoretical Investigation by Monte Carlo Method". Herald of the Bauman Moscow State Technical University. Series Natural Sciences, nr 3 (102) (czerwiec 2022): 69–85. http://dx.doi.org/10.18698/1812-3368-2022-3-69-85.

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The study solves the problem of the luminescent photons propagation in a resonantly absorbing medium consisting of atoms of the studied substance and a buffer inert gas. The Monte Carlo method was used in numerical experiments carried out to simulate real processes that occur in a chamber designed to determine the lifetime of an individual atom in an excited state by the method of measuring the luminescence intensity decay time. Findings of the research show that when luminescent photons are repeatedly scattered (scattering means the process of absorption and re-emission of a photon by an atom) in a medium, the luminescence decay time noticeably increases, reaching a value greater than the average lifetime of an individual atom in an excited state. The reflection of photons from the walls that make up the chamber can lead to errors in measuring the lifetime. The process of luminescence decay is studied theoretically for various detunings of the laser frequency from the resonant transition frequency. A three-level model of the atom and a model of complete frequency redistribution were applied. The study describes an algorithm based on the Monte Carlo method, which is used to model the three-level population kinetics, laser radiation transfer, radiation trapping, and frequency redistribution

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4

Molinaro, Céline, Sylvie Marguet, Ludovic Douillard, Fabrice Charra i Céline Fiorini-Debuisschert. "From plasmon-induced luminescence enhancement in gold nanorods to plasmon-induced luminescence turn-off: a way to control reshaping". Physical Chemistry Chemical Physics 20, nr 17 (2018): 12295–302. http://dx.doi.org/10.1039/c8cp00867a.

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5

Zeng, Cheng-Hui, Jing-Ling Wang, Yang-Yi Yang, Tian-Shu Chu, Sheng-Liang Zhong, Seik Weng Ng i Wing-Tak Wong. "Lanthanide CPs: the guest-tunable drastic changes of luminescent quantum yields, and two photon luminescence". J. Mater. Chem. C 2, nr 12 (2014): 2235–42. http://dx.doi.org/10.1039/c3tc32309a.

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6

Placide, Virginie, Anh Thy Bui, Alexei Grichine, Alain Duperray, Delphine Pitrat, Chantal Andraud i Olivier Maury. "Two-photon multiplexing bio-imaging using a combination of Eu- and Tb-bioprobes". Dalton Transactions 44, nr 11 (2015): 4918–24. http://dx.doi.org/10.1039/c4dt03115f.

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Two europium and terbium luminescent bio-probes whose luminescence can be sensitized by a two-photon sensitisation process have been designed and the proof-of-concept of biphotonic multiplexing experiment is described.

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7

Korepanov, Vladimir I., Pavel V. Petikar i Guang Hui Ge. "Luminescence of LiF Crystals Doped with Metal Oxide Impurities". Key Engineering Materials 685 (luty 2016): 623–26. http://dx.doi.org/10.4028/www.scientific.net/kem.685.623.

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The luminescence spectra and luminescence excitation spectra have been investigated in the spectral range of 6.5–4.4 eV. Pulsed cathodoluminescence of LiF-WО3 and LiF-TiО2 crystals has been studied in the temperature range of 20–300 K. All LiF crystals doped with metal oxides are found to have similar luminescent properties and identical structure of the luminescence centers. It is assumed that photon and electron bombardment induces excitation of different types of О2− oxygen centers perturbed by impurities and Fe2О3, WО3 and TiО2 included in the oxygen complexes.

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8

Mishra, K. C., J. K. Berkowitz, E. A. Dale, T. P. Das i K. H. Johnson. "Cooperative two-photon luminescence". Journal of Luminescence 46, nr 4 (maj 1990): 209–15. http://dx.doi.org/10.1016/0022-2313(90)90016-5.

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9

Gruzintsev A.N. "Optical modulation of anti-stokes photoluminescence of the Y-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-S : Er". Physics of the Solid State 64, nr 7 (2022): 831. http://dx.doi.org/10.21883/pss.2022.07.54589.320.

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The luminescence and excitation spectra of visible photoluminescence of Y2O2S : Er ceramics (1 at.%) at different optical pumping have been studied. It is shown that the anti-Stokes luminescence of single crystals doped with erbium has a high intensity when pumping the metastable state 4I13/2 of impurities. The resonant wavelengths of IR-photons for two-photon excitation of the visible glow Y2O2S : Er. are determined. A method of photooptical modulation of anti-Stokes luminescence has been developed, which makes it possible to determine the nature of the corresponding electronic transitions inside the excited glow centers. Keywords: Luminescence, excitation, photooptical modulation.

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10

Khodrog, Osama, Norlaili Kabir, Xue Gong, Qinghai Yuan i Jianhua Liu. "Scintillation and Luminescence Properties of the Zinc Oxide (ZnO) Doped Frit Crystal Under Gamma Radiation". Journal of Nanoelectronics and Optoelectronics 15, nr 5 (1.05.2020): 566–73. http://dx.doi.org/10.1166/jno.2020.2765.

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The main objective of this study is to determine the characteristics of the scintillation and luminescent for Zinc Oxide (ZnO). Two groups of ZnO were prepared: pure (P338) and doped (P338Frit). This study investigates the scintillation and luminescent properties of the prepared ZnO in both powder and crystal forms. The NaI(Tl) scintillator is used as a tool for the control scintillator. It is a crystal that is commercially utilized in many radiation detecting fields. The P338 and P338Frit were used as the scintillator in the experimental setup. The P338 and P338Frit were bombarded with gamma photons of 241Am and 137Cs. The set up was connected to Multichannel Analyzer (MCA) to analyse its gamma spectrum. The scintillation occurrence is followed by the occurrence of luminescence in order for photon interactions to be detected by the MCA system. The photons detected are called count. However, self-absorption of the light is common which prevail the count from being recorded even though the scintillation occurs. The Compton continuum and photoelectric peak of the interaction were not distinguished. In conclusion, the characteristics of the luminescence and scintillation for the prepared ZnO were observed, however, the gamma spectrum peaks recorded were inconclusive.

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11

Baker, Gary A., Chase A. Munson, Eric J. Bukowski, Sheila N. Baker i Frank V. Bright. "Assessment of One- and Two-Photon Excited Luminescence for Directly Measuring O2, pH, Na+, Mg2+, or Ca2+ in Optically Dense and Biologically Relevant Samples". Applied Spectroscopy 56, nr 4 (kwiecień 2002): 455–63. http://dx.doi.org/10.1366/0003702021955114.

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We compare the emission spectra and analytical response profiles of several semiselective luminescent probes that are commonly used to quantify nonfluorescent analytes (ruthenium(II) tris(2,2′-bipyridyl) dication, tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) dication, SNARF®-1, fluorescein, Rhodol Green™, and Sodium™, Magnesium™, and Calcium Green™) when they are excited under one- and two-photon excitation conditions in water, aqueous solutions of dyes or fluorophores, undiluted mouse or human serum, human urine, and mouse whole blood. The results from this work can be summarized as follows. First, in cases where the probes possess ground states that are composed of multiple species in equilibrium (e.g., acid and base forms of a luminophore), the analyte-dependent emission spectra can be significantly different under one- and two-photon excitation conditions due to differences in the relative one- and two-photon cross-sections associated with the individual ground-state species. Second, for those probes that exhibit one- and two-photon dependent emission spectra, an assessment of the analytical response vs. target analyte concentration profiles show that the response dynamic range can be improved by up to 100 fold, but the response sensitivity can decrease by up to 25% for two- vs. one-photon excitation. Third, two-photon excited luminescence provides a means to use these semiselective luminescent probes to quantify nonfluorescent analytes directly within optically dense mixtures, including solutions of dyes, mouse or human serum, human urine, and mouse whole blood. Finally, two-photon excited luminescence allows one to quantify nonfluorescent analytes in a spatially defined manner within complex samples.

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12

KADA, W., A. YOKOYAMA, M. KOKA, T. SATOH i T. KAMIYA. "DEVELOPMENT OF ANALYSIS SYSTEM OF MICRO-IBIL COMBINED WITH MICRO-PIXE". International Journal of PIXE 21, nr 01n02 (styczeń 2011): 1–11. http://dx.doi.org/10.1142/s0129083511002100.

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An ion beam induced luminescence analysis system using ion micro-beam (micro-IBIL) was newly developed on the microbeam system of the 3 MeV single-ended accelerator at ion-irradiation research facility TIARA, JAEA. The developed IBIL system consisted of an aspheric microlens, optical fibers, a monochromator and a photon-counting system to observe IBIL photons of specific wavelength with the resolution of 2 nm. A photomultiplier in the photon-counting system was cooled to around 0°C by a peltier device to reduce the background noises down to 10 cps and able to observe weak photon signals from specific chemical composites of the target. Experiments of micro-IBIL were performed using 3 MeV proton microbeam for several scintillators and particulate targets i.e. aerosol particles. The system had achieved chemical-imaging of aerosols by obtaining wavelength-dispersive micro-IBIL image at luminescence center of silicon dioxide.

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13

Peng, Chih Hao, H. T. Liu, K. T. Wu, Y. F. Chen, Hsiung Chou i I. Min Jiang. "Two-Photon Luminescence in Yb:YAG". Advanced Materials Research 535-537 (czerwiec 2012): 1359–66. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1359.

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This work studies the two-photon luminescence spectra of a Yb3+doped YAG crystal grown using the Czochralski method. To study the spectral performance of a 50 at.% Yb:YAG crystal, intense green light (centered at about 544nm) was generated by the crystal upon excitation using a 973nm InGaAs LD pump source. The luminescence spectra were obtained for various Yb concentrations and the emission intensity were plotted versus Yb3+concentration. The green emission light attributed to Yb3+two-photon transition.

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14

Tishchenko, E. V., i A. N. Vasil’ev. "Estimation of yield and decay kinetics of intraband luminescence in multiple-parabolic-branch-band model with account of phonons". Journal of Physics: Conference Series 2298, nr 1 (1.08.2022): 012004. http://dx.doi.org/10.1088/1742-6596/2298/1/012004.

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Abstract The emission spectrum of electron intraband luminescence was calculated for a dielectric crystal with conduction band consists of multiple parabolic branches. This shape of this spectrum adequately correspond to the CsI experimental spectra in the photon energy region ≥ 1.2 eV. The calculated total quantum yield of intraband luminescence of CsI is about 78 photons collected by the silicon photomultiplier per 1 MeV of deposited energy of ionizing radiation. This value is about two times higher than the experimental one, the difference is due to the simplification of the model. It was shown that characteristic times of intraband luminescence are about 1 ps.

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15

Kumano, H., H. Nakajima, S. Ekuni, Y. Idutsu, H. Sasakura i I. Suemune. "Quantum-Dot-Based Photon Emission and Media Conversion for Quantum Information Applications". Advances in Mathematical Physics 2010 (2010): 1–13. http://dx.doi.org/10.1155/2010/391607.

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Single-photon as well as polarization-correlated photon pair emission from a single semiconductor quantum dots is demonstrated. Single photon generation and single photon-pair generation with little uncorrelated multiphoton emission and the feasibility of media conversion of the quantum states between photon polarization and electron spin are fundamental functions for quantum information applications. Mutual media conversion for the angular momentum between photon polarization and electron spin is also achieved with high fidelity via positively charged exciton state without external magnetic field. This is a clear indication that the coupling of photon polarizations and electron spins keeps secured during whole processes before photon emission. Possibility of a metal-embedded structure is demonstrated with the observation of drastic enhancement of excitation and/or collection efficiency of luminescence as well as clear antibunching of photons generated from a quantum dot.

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16

Kurisu, H., J. Horie, K. Nagoya, S. Yamamoto i M. Matsuura. "Enhancement of Exciton and Biexciton Luminescence in CuCl QDs on Dielectric Multilayers". International Journal of Modern Physics B 15, nr 28n30 (10.12.2001): 3841–44. http://dx.doi.org/10.1142/s0217979201008809.

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We investigated photoluminescence properties of the exciton and the biexciton in CuCl quantum dots embedded in an SiO 2 matrix on (λ/4) TiO 2/(λ/4) SiO 2 dielectric multilayers of the distributed Bragg reflector. The intensities of the free exciton luminescence band and the biexciton luminescence bands are enhanced by factors 2 and 6 times in comparison with those in only CuCl quantum dots embedded in an SiO 2 matrix. The origin of this luminescence behavior is partly reflection effects of the luminescence and excitation laser lights but additional effects need to be considered. One possible candidate is the strong exciton-photon interaction due to the confinement effect of the photons in the active layer with CuCl quantum dots.

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17

Pang, Bo, Xiang Xi Meng, Yang Long Hou, Hong Fang Sun i Qiu Shi Ren. "Large-Scale High-Yield Synthesis of PdCu@Au Tripods and the Quantification of their Luminescence Properties for Cancer Cell Imaging". Journal of Nano Research 49 (wrzesień 2017): 85–97. http://dx.doi.org/10.4028/www.scientific.net/jnanor.49.85.

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The synthesis of anisotropic branched gold nanoparticles remines to be challenging as their arm number and arm length could hardly be controlled, greatly limited their biomedical application. We report the large-scale high-yield synthesis of PdCu@Au tripods, and, for the first time, their two-photon luminescence properties with quantitative characterization of the two-photon action cross section as well as quantum yield. By introducing nitrogen protection to the synthesis of the PdCu bimetallic cores, this approach eliminates the oxidative etching caused by oxygen in the air, providing a 2.5 times higher synthetic yield of 70.4 %, which enables the large-scale preparation of PdCu@Au at ca. 380 mg per batch. By the conformal coating of PdCu bimetallic cores, the PdCu@Au tripods are prepared with a purity of >90 % with average arm length 45.3 ± 5.6 nm that is ideal for biomedical applications. The PdCu@Au tripods demonstrate a much brighter two-photon luminescence than that from Au nanorods, with a 3.6 ± 0.9 times larger two-photon action cross section and comparable quantum yield. Our result also shows the two-photon luminescence property of PdCu@Au tripods could be tuned by their distinct localized surface plasmon resonance property and, in turn, the different amount of Au coating. This tunability could be explained by the recently-proposed two-step excitation mechanism of two-photon luminescence in Au nanoparticle. The folate-targeted in vitro two-photon luminescence imaging of MDA-MB-435 breast cancer cells were also demonstrated to show the great potential using PdCu@Au tripods as novel multi-functional platforms for cancer theranostics.

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18

Liu, Wen, Runze Chen i Sailing He. "Ultra-stable near-infrared Tm3+-doped upconversion nanoparticles for in vivo wide-field two-photon angiography with a low excitation intensity". Journal of Innovative Optical Health Sciences 12, nr 03 (maj 2019): 1950013. http://dx.doi.org/10.1142/s1793545819500135.

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Two-photon luminescence with near-infrared (NIR) excitation of upconversion nanoparticles (NPs) is of great importance in biological imaging due to deep penetration in high-scattering tissues, low auto-luminescence and good sectioning ability. Unfortunately, common two-photon luminescence is in visible band with an extremely high exciation power density, which limits its application. Here, we synthesized NaYF4:Yb[Formula: see text]Tm@NaYF4 upconversion NPs with strong two-photon NIR emission and a low excitation power density. Furthermore, NaYF4:Yb[Formula: see text]Tm@NaYF4@SiO2@OTMS@F127 NPs with high chemical stability were obtained by a modified multilayer coating method which was applied to upconversion NPs for the first time. In addition, it is shown that the as-prepared hydrophillic upconversion NPs have great biocompatibility and kept stable for 6 hours during in vivo whole-body imaging. The vessels with two-photon luminescence were clear even under an excitation power density as low as 25[Formula: see text]mW[Formula: see text]cm2. Vivid visualizations of capillaries and vessels in a mouse brain were also obtained with low background and high contrast. Because of cheaper instruments and safer power density, the NIR two-photon luminescence of NaYF4:Yb[Formula: see text]Tm@NaYF4 upconversion NPs could promote wider application of two-photon technology. The modified multilayer coating method could be widely used for upconversion NPs to increase the stable time of the in vivo circulation. Our work possesses a great potential for deep imaging and imaging-guided treatment in the future.

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19

Niu, Chun Hui, Yong Lv, Xiao Ying Li i Qing Shan Chen. "Study on Preparation of RGB Tricolor Up-Conversion Fluorescent Powder". Advanced Materials Research 1015 (sierpień 2014): 566–69. http://dx.doi.org/10.4028/www.scientific.net/amr.1015.566.

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For producing RGB tricolor luminescence, three kinds of components of rare-earth ions is chosen, which are Er3+doping, Er3+-Yb3+co-doping and Tm3+-Yb3+co-doping, respectively. Three kinds of rare-earth doped up-conversion fluoride material are prepared based on high temperature solid-state method. Under being excited by 980nm laser, three materials emit red, green and blue light, whose peak wavelengths are 660nm, 550nm and 480nm, respectively. Through analysis of luminescence process, it can be concluded that red and green luminescence are belong to two-photon absorption transversion, and blue luminescence is three-photon absorption transversion.

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20

Stoupin, Stanislav, Sergey Antipov i Alexander M. Zaitsev. "High-dynamic-range transmission-mode detection of synchrotron radiation using X-ray excited optical luminescence in diamond". Journal of Synchrotron Radiation 27, nr 3 (13.03.2020): 708–12. http://dx.doi.org/10.1107/s1600577520001174.

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Enhancement of X-ray excited optical luminescence in a 100 µm-thick diamond plate by introduction of defect states via electron beam irradiation and subsequent high-temperature annealing is demonstrated. The resulting X-ray transmission-mode scintillator features a linear response to incident photon flux in the range 7.6 × 108 to 1.26 × 1012 photons s−1 mm−2 for hard X-rays (15.9 keV) using exposure times from 0.01 to 5 s. These characteristics enable a real-time transmission-mode imaging of X-ray photon flux density without disruption of X-ray instrument operation.

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21

Yang, Ming, Shun An Chen, Qian Ru Lin i Tao Pang. "Temperature Sensing Assists the Understanding of Er³⁺ Concentration Dependent Anti-Stokes Luminescence in NaYF₄:Er³⁺/Yb³⁺ Nanophosphors". Materials Science Forum 1003 (lipiec 2020): 241–46. http://dx.doi.org/10.4028/www.scientific.net/msf.1003.241.

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In this paper, upcovnerison luminescence in Er3+/Yb3+ co-doped NaYF4 nanophosphors was regulated by changing the Er3+ concentration. With increasing the Er3+ concentration, the green and red emissions increased first and then decreased, but the intensity ratio of red to green emission decreased monotonically. To clarify the role of Er3+ doping, the factors including crystal structure, morphology and size of particle, photon absorption, energy transfer, multi-phonon relaxation, population of emissive levels and emission probability of radiative transitions were considered and analyzed. More importantly, we proposed a simple method for discussing radiation transitions based on luminescence temperature sensing.

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LaRochelle, Sophie, François Ouellette i Jocelyn Lauzon. "Two-photon excitation and bleaching of the 400 nm luminescence band in germanium-doped-silica optical fibres". Canadian Journal of Physics 71, nr 1-2 (1.01.1993): 79–84. http://dx.doi.org/10.1139/p93-012.

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The 400 nm luminescence band of germanium-doped-silica optical fibres was excited via two-photon absorption of an argon ion laser beam. It was observed that the photoluminescence decreased by as much as 25% during the exposure of the fibres to several hundred milliwatts of optical power fora few hours. Surprisingly, the amount of bleaching is not a given proportion of the initial intensity of the luminescence band. These luminescence measurements are qualitatively related to the photosensitivity of the optical fibres. The saturation of two-photon absorption at relatively low power is also observed.

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Chen, Xiaobo, i Zengfu Song. "Study on six-photon and five-photon ultraviolet upconversion luminescence". Journal of the Optical Society of America B 24, nr 4 (15.03.2007): 965. http://dx.doi.org/10.1364/josab.24.000965.

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D'Aléo, Anthony, Abdellah Felouat, Vasile Heresanu, Alain Ranguis, Damien Chaudanson, Artak Karapetyan, Michel Giorgi i Frédéric Fages. "Two-photon excited fluorescence of BF2complexes of curcumin analogues: toward NIR-to-NIR fluorescent organic nanoparticles". J. Mater. Chem. C 2, nr 26 (2014): 5208–15. http://dx.doi.org/10.1039/c4tc00543k.

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Mazo-Vargas, Anyimilehidi, Heungwon Park, Mert Aydin i Nicolas E. Buchler. "Measuring fast gene dynamics in single cells with time-lapse luminescence microscopy". Molecular Biology of the Cell 25, nr 22 (5.11.2014): 3699–708. http://dx.doi.org/10.1091/mbc.e14-07-1187.

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Time-lapse fluorescence microscopy is an important tool for measuring in vivo gene dynamics in single cells. However, fluorescent proteins are limited by slow chromophore maturation times and the cellular autofluorescence or phototoxicity that arises from light excitation. An alternative is luciferase, an enzyme that emits photons and is active upon folding. The photon flux per luciferase is significantly lower than that for fluorescent proteins. Thus time-lapse luminescence microscopy has been successfully used to track gene dynamics only in larger organisms and for slower processes, for which more total photons can be collected in one exposure. Here we tested green, yellow, and red beetle luciferases and optimized substrate conditions for in vivo luminescence. By combining time-lapse luminescence microscopy with a microfluidic device, we tracked the dynamics of cell cycle genes in single yeast with subminute exposure times over many generations. Our method was faster and in cells with much smaller volumes than previous work. Fluorescence of an optimized reporter (Venus) lagged luminescence by 15–20 min, which is consistent with its known rate of chromophore maturation in yeast. Our work demonstrates that luciferases are better than fluorescent proteins at faithfully tracking the underlying gene expression.

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Mai, Xuan-Dung, i Quang-Bac Hoang. "The Large-Scale Synthesis of Vinyl-Functionalized Silicon Quantum Dot and Its Application in Miniemulsion Polymerization". Journal of Nanomaterials 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/2490235.

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Stable luminescence, size-tunability, and biocompatibility encourage the deployment of Cd-free NPs into diverse biological applications. Here we report one-pot synthesis of blue-emitting and polymerizable silicon quantum dots (Si QDs) from which water-soluble Si QDs embedded polystyrene nanoparticles (SiQD@PS NPs) were prepared using a miniemulsion polymerization approach. The hydrodynamic size of NPs was controlled by KOH to oleic acid molar ratio. Studies on the photoluminescence properties of SiQD@PS NPs in different conditions reveal that they exhibit two-photon luminescence property and high stability against pH and UV exposure. These NPs add new size regime to the Si QDs based luminescent makers for bioimaging and therapy applications.

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Kuo, Wen-Shuo, Yen-Sung Lin, Ping-Ching Wu, Chia-Yuan Chang, Jiu-Yao Wang, Pei-Chi Chen, Miao-Hsi Hsieh, Hui-Fang Kao, Sheng-Han Lin i Chan-Chi Chang. "Two-Photon–Near Infrared-II Antimicrobial Graphene-Nanoagent for Ultraviolet–Near Infrared Imaging and Photoinactivation". International Journal of Molecular Sciences 23, nr 6 (17.03.2022): 3230. http://dx.doi.org/10.3390/ijms23063230.

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Nitrogen doping and amino group functionalization through chemical modification lead to strong electron donation. Applying these processes to a large π-conjugated system of graphene quantum dot (GQD)-based materials as electron donors increases the charge transfer efficiency of nitrogen-doped amino acid-functionalized GQDs (amino-N-GQDs), resulting in enhanced two-photon absorption, post-two-photon excitation (TPE) stability, TPE cross-sections, and two-photon luminescence through the radiative pathway when the lifetime decreases and the quantum yield increases. Additionally, it leads to the generation of reactive oxygen species through two-photon photodynamic therapy (PDT). The sorted amino-N-GQDs prepared in this study exhibited excitation-wavelength-independent two-photon luminescence in the near-infrared region through TPE in the near-infrared-II region. The increase in size resulted in size-dependent photochemical and electrochemical efficacy, increased photoluminescence quantum yield, and efficient two-photon PDT. Therefore, the sorted amino-N-GQDs can be applicable as two-photon contrast probes to track and localize analytes in in-depth two-photon imaging executed in a biological environment along with two-photon PDT to eliminate infectious or multidrug-resistant microbes.

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Takematsu, Kana, Sara A. M. Wehlin, Wesley Sattler, Jay R. Winkler i Harry B. Gray. "Two-photon spectroscopy of tungsten(0) arylisocyanides using nanosecond-pulsed excitation". Dalton Transactions 46, nr 39 (2017): 13188–93. http://dx.doi.org/10.1039/c7dt02632c.

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Tang, Minxian, Yanjie Huang, Yuan Wang i Limin Fu. "An ytterbium complex with unique luminescence properties: detecting the temperature based on a luminescence spectrum without the interference of oxygen". Dalton Transactions 44, nr 16 (2015): 7449–57. http://dx.doi.org/10.1039/c5dt00611b.

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[Yb(tta)₃DFQZ] exhibits improved two-photon-sensitized NIR-luminescence properties and thermally enhanced Yb³⁺ luminescence, and enables the detection of temperature without O₂ influence.

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Ullrich, Bruno, Ibrahim Kulaç i Harald Pint. "Photoelectronic properties of YBa2Cu3O6". Canadian Journal of Physics 71, nr 11-12 (1.11.1993): 512–17. http://dx.doi.org/10.1139/p93-080.

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The photocurrent and luminescence properties of thin (1 μm) YBa2Cu3O6 films on sapphire at 77 and 300 K are reported. We demonstrate that the luminescence mechanism of YBa2Cu3O6 depends considerably on the wavelength of the excitation used. Completely different luminescence responses are observed with the 351 and 458 nm lines. A fair agreement, like that in semiconductors with band-to-band transitions, is found between photocurrent and luminescence excited by the 458 nm line. The influence of high electric fields (≤ 5 780 V cm−1) on the photocurrent and luminescence of YBa2Cu3O6 is investigated for the first time. Similar effects on photon-induced tunneling phenomena (Franz–Keldysh effect) are observed. However, we show that the observed effects cannot be explained by photon-induced tunneling phenomena only since the influence of an electric field on the band structure of YBa2Cu3O6 is not only restricted to a bending of bands but modifies the band structure in a more complex manner.

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31

Uddin, Rahim, Jianxiang Wen, Tao He, Fufei Pang, Zhenyi Chen i Tingyun Wang. "Ultraviolet Irradiation Effects on luminescent Centres in Bismuth-Doped and Bismuth-Erbium Co-Doped Optical Fibers via Atomic Layer Deposition". Electronics 7, nr 10 (18.10.2018): 259. http://dx.doi.org/10.3390/electronics7100259.

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The effects of ultraviolet irradiation on luminescent centres in bismuth-doped (BDF) and bismuth/erbium co-doped (BEDF) optical fibers were examined in this study. The fibers were fabricated by modified chemical vapor deposition combining with atomic layer deposition method. The fibers were exposed to irradiation from a 193 nm pulsed wave argon fluoride laser, and an 830 nm wavelength laser diode pump source was employed for excitation. The experimental results showed that, for the BDF, the transmission loss was slightly reduced and the luminescence intensity was increased at the bismuth-related active aluminum centre (BAC-Al). Then, for the BEDF, the transmission loss was increased a little and the luminescence intensity was also increased at the BAC-Al centre. However, the luminescence intensity was decreased at approximately 1420 nm of the bismuth-related active silica centre (BAC-Si) for all fiber samples. One possible formation mechanism for luminescence intensity changes was probably associated with the valence state transfer of bismuth ions. The other possible mechanism was that the ArF-driven two-photon process caused luminescence changes in BAC-Al and BAC-Si. It was very important to reveal nature of luminescence properties of Bi-doped and Bi/Er co-doped optical fiber.

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32

Kalinushkin V. P., Gladilin A. A., Uvarov O. V., Mironov S. A., Chapnin V. A., Studenikin M. I., Il’ichev N. N., Gavrishchuk E. M., Rodin S. A. i Timofeeva N. A. "Effect of annealing atmosphere on the luminescence characteristics of CVD-ZnSe". Semiconductors 56, nr 1 (2022): 63. http://dx.doi.org/10.21883/sc.2022.01.53022.9731.

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The influence of the atmosphere of CVD-ZnSe annealing carried out in modes close to the procedure of their doping with iron on the luminescent characteristics of these crystals is investigated. It was found that annealing in the atmosphere of argon and selenium leads to a qualitative change in the impurity-defect composition and to a complex spatial distribution of the luminescent characteristics of CVD-ZnSe, especially in the crystal region at a distance of up to 400 microns from the surface. In the case of annealing in zinc, the luminescent characteristics are more uniform, with the exception of the near-surface zone with a width of about 100 microns, which has a high luminescence intensity in the entire spectral range under study (0.44-0.72 microns). The obtained results are interpreted on the basis of the assumption about the evaporation of zinc during annealing in argon and selenium. Based on the analysis of the spatial distribution of luminescence, assumptions are made about the nature of the observed impurity-defect centers. Keywords: two-photon confocal microscopy, CVD-ZnSe, impurity-defect composition, high temperature annealing.

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33

Гладилин, А. А., В. П. Данилов, Н. Н. Ильичев, В. П. Калинушкин, М. И. Студеникин, О. В. Уваров, В. А. Чапнин i in. "Исследование мощности люминесценции экситонов и примесно-дефектных центров, возбуждаемых с помощью двухфотонного поглощения". Физика и техника полупроводников 54, nr 1 (2020): 48. http://dx.doi.org/10.21883/ftp.2020.01.48770.9143.

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In the present work, using as an example ZnSe: Fe2+ single crystals, it was experimentally and theoretically studied the effect of the average power of femtosecond laser radiation on the average luminescence power of excitons and impurity-defect centers upon two-photon excitation of the electronic system of a crystal. It has been experimentally shown that the average luminescence power of crystal excitons in the studied range of excitation powers is proportional to 4 degrees of the average excitation radiation power. The average luminescence power of impurity-defect centers has a quadratic character. A theory is constructed that explains the experimentally observed dependencies. It is noted that the nature of the dependence of the crystal luminescence on the pump power during two-photon excitation can be used to estimate the degree of contamination of the crystal by impurity-defect centers.

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34

Petrov Yu.V., Gogina O.A., Vyvenko O.F., Kovalchuk S., Bolotin K., Watanabe K. i Taniguchi T. "Ion-beam Modification of the Local Luminescent Properties of Hexagonal Boron Nitride". Technical Physics 92, nr 8 (2022): 984. http://dx.doi.org/10.21883/tp.2022.08.54560.66-22.

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Hexagonal boron nitride is a promising material of modern optoelectronics. Point defects in this material can serve as single-photon sources. In this paper we investigate the modification of the luminescent properties of hexagonal boron nitride by means of local irradiation with focused gallium and helium ion beams. It is demonstrated that the intensity of band-to-band cathodoluminescence monotonically decreases with increasing ion fluence for both gallium and helium. The luminescence band of about 2 eV may become more intense after exposure to He ions with certain ion fluence. The effect of complete quenching of luminescence after gallium irradiation is used to estimate the diffusion length of excess charge carriers. Keywords: point defects, cathodoluminescence, scanning helium ion microscope, excess charge carriers.

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35

GHOSHAL, S. K., DEVENDRA MOHAN, TADESSE TENAW KASSA i SUNITA SHARMA. "NANOSILICON FOR PHOTONIC APPLICATIONS". International Journal of Modern Physics B 21, nr 22 (10.09.2007): 3783–96. http://dx.doi.org/10.1142/s0217979207037867.

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This presentation is a short review of some scientific insights on the possibilities of photonic applications of nanostructured silicon ( NS – Si ), porous Si ( p - Si ) and Si nanocrystals ( NC – Si ), one of the most interesting problems in nano-crystallite physics. The emission mechanism of a very bright photo-luminescence (PL) band and relatively weak electro-luminescence (EL) are presently the main issue. The basic question lies in whether the emission is an extrinsic or intrinsic property of nanocrystals. It is important from a fundamental physics viewpoint because of the potential application of Si wires and quantum dots in optoelectronic devices and information technology. Nanostructuring silicon is an effective way to turn silicon into a photonic material. It is observed that low-dimensional (one and two dimensions) silicon shows light amplification, photon confinement, photon trapping as well as non-linear optical effects. There is strong evidence of light localization and gas sensing properties of such nanostructures. Future nano-technology would replace electrical with optical interconnects, which has appealing potential for higher-speed performance and immunity to signal cross talk.

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36

Oleynichuk E. A., Danilov P. A., Lednev V. N., Sdvizhenskii P. A., Kuznetsov M. S., Tarelkin S. A., Bondarenko M. G. i Khmelnitsky R. A. "Laser-induced luminescence of boron-doped synthetic diamond at various laser pulse durations". Optics and Spectroscopy 130, nr 4 (2022): 381. http://dx.doi.org/10.21883/eos.2022.04.53721.47-21.

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Excitation of type IIb synthetic diamond by ultrashort laser pulses in the visible range causes broadband luminescence in the UV visible range; the observed luminescence band can be attributed to the A band characteristic of diamonds. The photoluminescence spectra were obtained at different laser pulse durations (0.3-6.2 ps) depending on the pulse energy. A nonlinear dependence of the luminescence yield on the intensity of ultrashort pulses is established. Keywords: broadband luminescence, boron doped diamond, two-photon luminescence, A-band.

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37

Hessley, R. K. "Luminescence in coal and its relation to clay minerals". Clay Minerals 24, nr 1 (marzec 1989): 107–13. http://dx.doi.org/10.1180/claymin.1989.024.1.09.

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AbstractRoom-temperature dehydration of aqueous coal slurries, coal extraction residue, or coal ash results in spontaneous luminescence. The phenomenon is characterized by a monotonic decay in photon activity which precedes a sharp rise in photon release. A maximum is reached within several minutes but subsequent decay is slower and photon emission continues for an extended period of time. The magnitude of photon activity is severely limited by the thickness of the strongly absorbing coal slurry. Prior removal of mineral matter from the coal appears to curtail the dehydration-induced phenomena, suggesting that clays or clay-organic interactions are responsible. Data also suggest that air is required as a medium for discharging the excited species.

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38

Yang, Na, Xiaohua Qi, Di Yang, Mengyao Chen, Yao Wang, Linjun Huang, Olga Grygoryeva, Peter Strizhak, Alexander Fainleib i Jianguo Tang. "Improved Mechanical, Anti-UV Irradiation, and Imparted Luminescence Properties of Cyanate Ester Resin/Unzipped Multiwalled Carbon Nanotubes/Europium Nanocomposites". Materials 14, nr 15 (29.07.2021): 4244. http://dx.doi.org/10.3390/ma14154244.

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Cyanate ester resin (CER) is an excellent thermal stable polymer. However, its mechanical properties are not appropriate for its application, with brittle weakness, and it has poor functional properties, such as luminescence. This work innovatively combines the luminescence property and the improved mechanical properties with the inherent thermal property of cyanate ester. A novel nanocomposite, CER/uMWCNTs/Eu, with multi-functional properties, has been prepared. The results show that with the addition of 0.1 wt.% of uMWCNTs to the resin, the flexural strength and tensile strength increased 59.3% and 49.3%, respectively. As the curing process of the CER progresses, the injected luminescence signal becomes luminescence behind the visible (FBV). The luminescence intensity of CER/uMWCNTs/Eu was much stronger than that of CER/MWCNTs/Eu, and the luminescence lifetime of CER/MWCNTs/Eu and CER/uMWCNTs/Eu was 8.61 μs and 186.39 μs, respectively. FBV exhibited great potential in the embedment of photon quantum information. Therefore, it can be predicted that CER/uMWCNTs/Eu composites will not only have a wide range of applications in sensing, detection, and other aspects, but will also exhibit great potential in the embedding of photon quantum information.

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39

Campioli, Elisa, Domna Maria Nikolaidou, Vincent Hugues, Marco Campanini, Lucia Nasi, Mireille Blanchard-Desce i Francesca Terenziani. "Amplified two-photon brightness in organic multicomponent nanoparticles". Journal of Materials Chemistry C 3, nr 28 (2015): 7483–91. http://dx.doi.org/10.1039/c5tc01136a.

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40

Du, Mengfei, Yi Chen, Weitong Li, Linzhi Su, Huangjian Yi, Fengjun Zhao, Kang Li, Lin Wang i Xin Cao. "MSCN-NET: Multi-stage cascade neural network based on attention mechanism for Čerenkov luminescence tomography". Journal of Applied Physics 132, nr 17 (7.11.2022): 173104. http://dx.doi.org/10.1063/5.0119787.

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Čerenkov luminescence tomography (CLT) is a highly sensitive and promising technique for three-dimensional non-invasive detection of radiopharmaceuticals in living organisms. However, the severe photon scattering effect causes ill-posedness of the inverse problem, and the results of CLT reconstruction are still unsatisfactory. In this work, a multi-stage cascade neural network is proposed to improve the performance of CLT reconstruction, which is based on the attention mechanism and introduces a special constraint. The network cascades an inverse sub-network (ISN) and a forward sub-network (FSN), where the ISN extrapolates the distribution of internal Čerenkov sources from the surface photon intensity, and the FSN is used to derive the surface photon intensity from the reconstructed Čerenkov source, similar to the transmission process of photons in living organisms. In addition, the FSN further optimizes the reconstruction results of the ISN. To evaluate the performance of our proposed method, numerical simulation experiments and in vivo experiments were carried out. The results show that compared with the existing methods, this method can achieve superior performance in terms of location accuracy and shape recovery capability.

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41

Wang, Tianyi, David Halaney, Derek Ho, Marc D. Feldman i Thomas E. Milner. "Two-photon luminescence properties of gold nanorods". Biomedical Optics Express 4, nr 4 (21.03.2013): 584. http://dx.doi.org/10.1364/boe.4.000584.

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42

Kupov, M. R., V. S. Gorelik, P. P. Sverbil i L. S. Lepnev. "Two-photon luminescence in POPOP and stilbene". Journal of Physics: Conference Series 1348 (grudzień 2019): 012055. http://dx.doi.org/10.1088/1742-6596/1348/1/012055.

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43

Nie, Z. G., J. H. Zhang, X. Zhang, S. Z. Lü, X. G. Ren, G. B. Zhang i X. J. Wang. "Photon cascade luminescence in CaAl12O19:Pr, Cr". Journal of Solid State Chemistry 180, nr 10 (październik 2007): 2933–41. http://dx.doi.org/10.1016/j.jssc.2007.08.024.

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Yang, Z., J. H. Lin, M. Z. Su, Y. Tao i W. Wang. "Photon cascade luminescence of Gd3+ in GdBaB9O16". Journal of Alloys and Compounds 308, nr 1-2 (sierpień 2000): 94–97. http://dx.doi.org/10.1016/s0925-8388(00)00908-7.

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45

Agal'tsov, A. M., P. P. Garyaev, V. S. Gorelik, I. A. Ramatullaev i V. A. Shcheglov. "Two-photon-excited luminescence of genetic structures". Quantum Electronics 26, nr 2 (28.02.1996): 177–80. http://dx.doi.org/10.1070/qe1996v026n02abeh000618.

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46

Gorelik, V. S., A. M. Agaltzov i L. I. Zlobina. "Two-photon excited luminescence in condensed matters". Journal of Molecular Structure 266 (marzec 1992): 121–26. http://dx.doi.org/10.1016/0022-2860(92)80056-n.

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47

Omelkov, S. I., K. Chernenko, J. C. Ekström, A. Jurgilaitis, A. Khadiev, A. Kivimäki, A. Kotlov i in. "Recent advances in time-resolved luminescence spectroscopy at MAX IV and PETRA III storage rings". Journal of Physics: Conference Series 2380, nr 1 (1.12.2022): 012135. http://dx.doi.org/10.1088/1742-6596/2380/1/012135.

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Abstract Short-wavelength synchrotron radiation excitation has been an indispensable tool in the studies of the properties of wide gap materials using time-resolved low-temperature luminescence spectroscopy. In recent years, several setups for such investigations have been launched at MAX IV Laboratory and Photon Science at DESY. Two permanently stationed time-resolved luminescence setups at FinEstBeAMS and P66 beamlines are in operation at MAX IV 1.5 GeV and Petra III storage rings, respectively. Mobile luminescence setups have been developed for studies at FemtoMAX and P23 beamlines. FinEstBeAMS, P66 and P23 provide time resolution from ∼160 to 100 ps. The FemtoMAX photon source based on an in-vacuum undulator getting an electron beam from the 3 GeV linear accelerator provides an exceptional time resolution of ∼30 ps, limited by time response of the photodetector. The performance of the setups, achieved milestones and research challenges are discussed for four new luminescence stations available for the research community with the main focus on time-resolved techniques.

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48

Robbins, Emma, Stéphanie Leroy-Lhez, Nicolas Villandier, Marek Samoć i Katarzyna Matczyszyn. "Prospects for More Efficient Multi-Photon Absorption Photosensitizers Exhibiting Both Reactive Oxygen Species Generation and Luminescence". Molecules 26, nr 20 (19.10.2021): 6323. http://dx.doi.org/10.3390/molecules26206323.

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The use of two-photon absorption (TPA) for such applications as microscopy, imaging, and photodynamic therapy (PDT) offers several advantages over the usual one-photon excitation. This creates a need for photosensitizers that exhibit both strong two-photon absorption and the highly efficient generation of reactive oxygen species (ROS), as well as, ideally, bright luminescence. This review focuses on different strategies utilized to improve the TPA properties of various multi-photon absorbing species that have the required photophysical properties. Along with well-known families of photosensitizers, including porphyrins, we also describe other promising organic and organometallic structures and more complex systems involving organic and inorganic nanoparticles. We concentrate on the published studies that provide two-photon absorption cross-section values and the singlet oxygen (or other ROS) and luminescence quantum yields, which are crucial for potential use within PDT and diagnostics. We hope that this review will aid in the design and modification of novel TPA photosensitizers, which can help in exploiting the features of nonlinear absorption processes.

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Gan, Zhixing, Lizhe Liu, Li Wang, Guangsheng Luo, Chunlan Mo i Chenliang Chang. "Bright, stable, and tunable solid-state luminescence of carbon nanodot organogels". Physical Chemistry Chemical Physics 20, nr 26 (2018): 18089–96. http://dx.doi.org/10.1039/c8cp02069h.

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Radtke, J., J. Sponner, C. Jakobi, J. Schneider, M. Sommer, T. Teichmann, W. Ullrich, J. Henniger i T. Kormoll. "Single photon detection and signal analysis for high sensitivity dosimetry based on optically stimulated luminescence with beryllium oxide". EPJ Web of Conferences 170 (2018): 09009. http://dx.doi.org/10.1051/epjconf/201817009009.

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Single photon detection applied to optically stimulated luminescence (OSL) dosimetry is a promising approach due to the low level of luminescence light and the known statistical behavior of single photon events. Time resolved detection allows to apply a variety of different and independent data analysis methods. Furthermore, using amplitude modulated stimulation impresses time- and frequency information into the OSL light and therefore allows for additional means of analysis. Considering the impressed frequency information, data analysis by using Fourier transform algorithms or other digital filters can be used for separating the OSL signal from unwanted light or events generated by other phenomena. This potentially lowers the detection limits of low dose measurements and might improve the reproducibility and stability of obtained data. In this work, an OSL system based on a single photon detector, a fast and accurate stimulation unit and an FPGA is presented. Different analysis algorithms which are applied to the single photon data are discussed.

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