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1. Facilitating Low-Energy Activation in the Near-Infrared Persistent Luminescent Phosphor Zn₁₊ₓGa₂–₂ₓSnₓO₄:Cr³⁺via Crystal Field Strength Modulations

Author:
Pan, Zaifa; Castaing, Victor; Yan, Liping; Zhang, Lulu; Zhang, Cong; Shao, Kang; Zheng, Yifan; Duan, Changkui; Liu, Jianhua; Richard, Cyrille; Viana, Bruno
Source:
Journal of physical chemistry 2020 v.124 no.15 pp. 8347-8358
ISSN:
1932-7455
Subject:
photons,   etc   ; bioimaging; cations; luminescence;     Show all 4 Subjects
Abstract:
... Cr³⁺-activated persistent luminescent phosphors with a spinel structure are emerging materials in bio-imaging applications for their distinctive features of deep biotissue penetration and rechargeable near-infrared persistent emission. To realize the long-term and multicycle imaging purpose, reactivation using in situ external light with deep biotissue penetration is an alternative strategy, apart ...
DOI:
10.1021/acs.jpcc.0c01951

2. Exciton-Polariton Properties in Planar Microcavity of Millimeter-Sized Two-Dimensional Perovskite Sheet

Author:
Zhang, Xiaoli; Shi, Huafeng; Dai, Haitao; Zhang, Xinhai; Sun, Xiao Wei; Zhang, Zhaoyu
Source:
ACS applied materials & interfaces 2020 v.12 no.4 pp. 5081-5089
ISSN:
1944-8252
Subject:
photons,   etc   ; absorption; emissions; energy;     Show all 4 Subjects
Abstract:
... In this work, the self-organized two-dimensional (2D) perovskite crystal sheet was synthesized for exciton-polariton studies. The layered 2D perovskite sheets naturally form Fabry–Pérot (F–P) optical cavities and exhibit evident cavity polariton modes. In the region of F–P cavity polariton modes, an exciton-polariton is formed by the superposition of strongly coupled exciton and photon states and ...
DOI:
10.1021/acsami.9b19968

3. Cavity-enhanced energy transfer between nano-emitters and monolayer graphene

Author:
Wang, Jun-Feng; Zhou, Hao-Lei; Xiong, Xiao; Li, Qiang; Cheng, Ze-Di; Liu, Zheng-Hao; Yan, Fei-Fei; Lin, Sheng-Ran; Xu, Jin-Shi; Wang, Guan-Zhong; Wu, Lin; Li, Chuan-Feng; Guo, Guang-Can
Source:
Carbon 2020 v.161 pp. 794-799
ISSN:
0008-6223
Subject:
photons,   etc   ; aluminum; energy transfer; graphene; nanodiamonds; silica;     Show all 6 Subjects
Abstract:
... Photonic cavities have been shown to efficiently control and enhance the Förster resonance energy transfer (FRET) between point-like donors and acceptors. In this work, we experimentally implemented photonic cavity control of the energy transfer between point-like donors and two-dimensional acceptors, using an integrated system combining an Al/SiO₂ cavity with nano-emitters and graphene. We demons ...
DOI:
10.1016/j.carbon.2020.02.003

4. Estimation of gamma-rays, and fast and the thermal neutrons attenuation characteristics for bismuth tellurite and bismuth boro-tellurite glass systems

Author:
Lakshminarayana, G.; Kebaili, Imen; Dong, M. G.; Al-Buriahi, M. S.; Dahshan, A.; Kityk, I. V.; Lee, Dong-Eun; Yoon, Jonghun; Park, Taejoon
Source:
Journal of materials science 2020 v.55 no.14 pp. 5750-5771
ISSN:
0022-2461
Subject:
photons,   etc   ; bismuth; energy; gamma radiation; neutrons;     Show all 5 Subjects
Abstract:
... Gamma-rays and fast and thermal neutron attenuation features of (Bi₂O₃)ₓ–(TeO₂)₍₁₀₀₋ₓ₎ (where x = 5, 8, 10, 12, and 15 mol%) and [(TeO₂)₀.₇–(B₂O₃)₀.₃]₍₁₋ₓ₎–(Bi₂O₃)ₓ (where x = 0.05, 0.10, 0,15, 0.20, 0.25, and 0.3 mol%) glass systems have been explored and compared. For all samples, mass attenuation coefficients (μ/ρ) are estimated within 0.015–15 MeV photon energy range by MCNP5 simulation code a ...
DOI:
10.1007/s10853-020-04446-4

5. Chiral Photonic Liquid Crystalline Polyethers with Widely Tunable Helical Superstructures

Author:
Farooq, Muhammad Amjad; Wei, Wei; Xiong, Huiming
Source:
Langmuir 2020 v.36 no.12 pp. 3072-3079
ISSN:
1520-5827
Subject:
photons,   etc   ; ambient temperature; moieties; polymerization; polymers; wavelengths;     Show all 6 Subjects
Abstract:
... Liquid crystalline polymers with tunable structures on the scale of visible wavelength are important in optical technology due to their enhanced mechanical stability, processability, and structural integrity. Herein, we report a series of cholesteric liquid crystalline (CLC) polyethers with a widely tunable pitch length and a broad CLC phase window through a bottom-up structural design. The well-d ...
DOI:
10.1021/acs.langmuir.0c00304

6. Substitutional Doping of Yb³⁺ in CsPbBrₓCl₃–ₓ Nanocrystals

Author:
Lesage, Arnon; van der Laan, Marco; Gomez, Leyre; Gregorkiewicz, Tom
Source:
Journal of physical chemistry 2020 v.124 no.11 pp. 6413-6417
ISSN:
1932-7455
Subject:
photons,   etc   ; energy; ions; lead; nanocrystals; semiconductors; ytterbium;     Show all 7 Subjects
Abstract:
... Lead halide perovskite nanocrystals (NCs) have been widely studied in recent years because of their huge application potential as a cost-effective UV–vis semiconductor. On the other hand, introduction of rare-earth (RE) ions is a popular way to modify the photonic properties of semiconductors because of their sharp electronic transitions in vis–NIR. However, with small absorption cross sections, f ...
DOI:
10.1021/acs.jpcc.9b11393

7. Lotus-Leaf-Inspired Flexible and Tunable Random Laser

Author:
Li, Xueyang; Liu, Hao; Xu, Xiaoyan; Yang, Bing; Yuan, Hong; Guo, Jingwei; Sang, Fengting; Jin, Yuqi
Source:
ACS applied materials & interfaces 2020 v.12 no.8 pp. 10050-10057
ISSN:
1944-8252
Subject:
photons,   etc   ; biosensors; dyes; lasers; leaves; photostability; resorption;     Show all 7 Subjects
Abstract:
... We describe herein a flexible and tunable random laser made from a flexible poly(dimethylsiloxane) substrate. The substrate is prepared by casting via soft lithography from a lotus leaf to produce a micropapilla surface structure similar to that of a lotus leaf. The micropapilla provides efficient multiple scattering for the photons generated in the gain medium, and random lasing emerges because p ...
DOI:
10.1021/acsami.9b23524

8. Silicon optical sensor arrays for environmental and health applications

Author:
Bryan, Michael R.; Miller, Benjamin L.
Source:
Current opinion in environmental science & health 2019 v.10 pp. 22-29
ISSN:
2468-5844
Subject:
photons,   etc   ; optical properties; silicon;     Show all 3 Subjects
Abstract:
... Dramatic advances in our understanding of biology have been met step by step with advances in sensor technology. Sensors based on the optical properties of silicon have proven to be particularly useful. This brief review discusses two primary classes of silicon-based sensors capable of multiplex detection: sensors using free-space optics and relying on changes in the reflective properties of the s ...
DOI:
10.1016/j.coesh.2019.09.005

9. Productivity related to ambient photon flux for phytoplankton communities under different turbid conditions

Author:
Båmstedt, Ulf
Source:
Hydrobiologia 2019 v.837 no.1 pp. 109-115
ISSN:
0018-8158
Subject:
photons,   etc   ; chlorophyll; mixing; phytoplankton;     Show all 4 Subjects
Abstract:
... Phytoplankton productivity standardized to chlorophyll a and photon flux (mg C mg chl. a⁻¹ mol photons⁻¹) of natural communities from northern Bothnian Sea under dynamic (vertically rotating) incubations and different optical conditions was studied during four mesocosm experiments between April 2013 and April 2016. The standardized productivity showed a positive exponential relationship with calcu ...
DOI:
10.1007/s10750-019-3964-1

10. A two-photon active chevron-shaped type I photoinitiator designed for 3D stereolithography

Author:
Zhou, Ruchun; Malval, Jean-Pierre; Jin, Ming; Spangenberg, Arnaud; Pan, Haiyan; Wan, Decheng; Morlet-Savary, Fabrice; Knopf, Stephan
Source:
Chemical communications 2019 v.55 no.44 pp. 6233-6236
ISSN:
1364-548X
Subject:
photons,   etc   ; chemical compounds; polymerization;     Show all 3 Subjects
Abstract:
... We present herein the properties of a highly reactive type I photoinitiator with significant 2PA cross-sections (δ₇₂₀ₙₘ ∼ 90 GM). We demonstrate that this new type of photocleavable system exhibits very efficient two-photon polymerization abilities with performances amplified by more than two orders of magnitude with regards to those of a commercially available type I photoinitiator (Lucirin TPO-L ...
DOI:
10.1039/c9cc02923k

11. Annihilation Versus Excimer Formation by the Triplet Pair in Triplet–Triplet Annihilation Photon Upconversion

Author:
Ye, Chen; Gray, Victor; Mårtensson, Jerker; Börjesson, Karl
Source:
Journal of the American Chemical Society 2019 v.141 no.24 pp. 9578-9584
ISSN:
1520-5126
Subject:
photons,   etc   ; energy; solvents;     Show all 3 Subjects
Abstract:
... The triplet pair is the key functional unit in triplet–triplet annihilation photon upconversion. The same molecular properties that stabilize the triplet pair also allow dimers to form on the singlet energy surface, creating an unwanted energy relaxation pathway. Here we show that excimer formation most likely is a consequence of a triplet dimer formed before the annihilation event. Polarity-depen ...
DOI:
10.1021/jacs.9b02302
PubMed:
31131601
PubMed Central:
PMC6608582

12. Unraveling the Electronic Properties of Lead Halide Perovskites with Surface Photovoltage in Photoemission Studies

Author:
Zu, Fengshuo; Wolff, Christian M.; Ralaiarisoa, Maryline; Amsalem, Patrick; Neher, Dieter; Koch, Norbert
Source:
ACS applied materials & interfaces 2019 v.11 no.24 pp. 21578-21583
ISSN:
1944-8252
Subject:
photons,   etc   ; solar energy; spectroscopy;     Show all 3 Subjects
Abstract:
... The tremendous success of metal-halide perovskites, especially in the field of photovoltaics, has triggered a substantial number of studies in understanding their optoelectronic properties. However, consensus regarding the electronic properties of these perovskites is lacking due to a huge scatter in the reported key parameters, such as work function (Φ) and valence band maximum (VBM) values. Here ...
DOI:
10.1021/acsami.9b05293

13. Resilient Graphene Ultrathin Flat Lens in Aerospace, Chemical, and Biological Harsh Environments

Author:
Cao, Guiyuan; Lin, Han; Fraser, Scott; Zheng, Xiaorui; Del Rosal, Blanca; Gan, Zhixing; Wei, Shibiao; Gan, Xiaosong; Jia, Baohua
Source:
ACS applied materials & interfaces 2019 v.11 no.22 pp. 20298-20303
ISSN:
1944-8252
Subject:
photons,   etc   ; graphene; pH; semiconductors;     Show all 4 Subjects
Abstract:
... The development of ultrathin flat lenses has revolutionized the lens technologies and holds great promise for miniaturizing the conventional lens system in integrated photonic applications. In certain applications, the lenses are required to operate in harsh and/or extreme environments, for example aerospace, chemical, and biological environments. Under such circumstances, it is critical that the ...
DOI:
10.1021/acsami.9b05109

14. Tunable Emission from Triplet Fusion Upconversion in Diketopyrrolopyrroles

Author:
Pun, Andrew B.; Campos, Luis M.; Congreve, Daniel N.
Source:
Journal of the American Chemical Society 2019 v.141 no.9 pp. 3777-3781
ISSN:
1520-5126
Subject:
photons,   etc   ; energy; wavelengths;     Show all 3 Subjects
Abstract:
... Optical upconversion based on triplet fusion (TF), also known as triplet–triplet annihilation, is a process by which two or more low-energy photons are converted to one higher energy photon. This process requires two components, a sensitizer which absorbs the incident low-energy photons and an annihilator which emits the higher energy photons. While much attention has been given to the investigati ...
DOI:
10.1021/jacs.8b11796

15. Nanomaterials for photoacoustic imaging in the second near-infrared window

Author:
Huang, Kai; Zhang, Yifan; Lin, Jing; Huang, Peng
Source:
Biomaterials science 2019 v.7 no.2 pp. 472-479
ISSN:
2047-4849
Subject:
photons,   etc   ; image analysis; nanomaterials;     Show all 3 Subjects
Abstract:
... Photoacoustic imaging (PAI) is a rapidly developing imaging technique for both fundamental research and clinical applications. Recent studies revealed that PAI in the second near-infrared (NIR-II) region exhibits enhanced deep-tissue imaging capability, which benefits from reduced photon scattering, minimized background noise and increased applicable power in comparison to PAI in the first near-in ...
DOI:
10.1039/c8bm00642c

16. Determination of the X-ray attenuation coefficient of bismuth oxychloride nanoplates in polydimethylsiloxane

Author:
Jagdale, Pravin; Rovere, Massimo; Ronca, Riccardo; Vigneri, Claudio; Bernardini, Francesco; Calzetta, Gianpiero; Tagliaferro, Alberto
Source:
Journal of materials science 2020 v.55 no.16 pp. 7095-7105
ISSN:
0022-2461
Subject:
photons,   etc   ; X-radiation; bismuth; copper; energy; image analysis; medicine; polydimethylsiloxane;     Show all 8 Subjects
Abstract:
... The aim of this research is to present a method to evaluate the X-ray attenuation coefficient of (nano)particles by uniformly dispersing them in a host polymer, polydimethylsiloxane. The method is described and applied to the case of a material of interest for medical application in X-ray shielding and imaging, namely bismuth oxychloride nanoplates (BiOCl NP). A diagnostic X-ray machine was used t ...
DOI:
10.1007/s10853-020-04498-6

17. Ultrafast Photonic PCR Based on Photothermal Nanomaterials

Author:
You, Minli; Li, Zedong; Feng, Shangsheng; Gao, Bin; Yao, Chunyan; Hu, Jie; Xu, Feng
Source:
Trends in biotechnology 2020 v.38 no.6 pp. 637-649
ISSN:
0167-7799
Subject:
photons,   etc   ; energy conversion; equipment; nanomaterials; nucleic acids; polymerase chain reaction;     Show all 6 Subjects
Abstract:
... Over the past few decades, PCR has been the gold standard for detecting nucleic acids (NAs) in various biomedical fields. However, there are several limitations associated with conventional PCR, such as complicated operation, need for bulky equipment, and, in particular, long thermocycling time. Emerging nanomaterials with photothermal effects have shown great potential for developing a new genera ...
DOI:
10.1016/j.tibtech.2019.12.006

18. Shape anisotropic colloidal particle fabrication using 2-photon polymerization

Author:
Saraswat, Yug C.; Ibis, Fatma; Rossi, Laura; Sasso, Luigi; Eral, Huseyin Burak; Fanzio, Paola
Source:
Journal of colloid and interface science 2020 v.564 pp. 43-51
ISSN:
0021-9797
Subject:
photons,   etc   ; anisotropy; colloids; diffusivity; geometry; hydrodynamics; manufacturing; microscopy; polymerization; synthesis;     Show all 10 Subjects
Abstract:
... Our ability to dictate the colloid geometry is intimately related to self-assembly. The synthesis of anisotropic colloidal particles is currently dominated by wet chemistry and lithographic techniques. The wet chemical synthesis offers limited particle geometries at bulk quantities. Lithographic techniques, on the other hand, provide precise control over the particle shape, although at lower yield ...
DOI:
10.1016/j.jcis.2019.12.035

19. Influence of Magnetic Field on the Two-Photon Absorption and Hyper-Rayleigh Scattering of Manganese–Zinc Ferrite Nanoparticles

Author:
Gonçalves, Eduardo S.; Cocca, Leandro H. Z.; Araujo, Wagner W. R.; Parekh, Kinnari; Oliveira, Cristiano L. P.; Siqueira, Jonathas P.; Mendonça, Cleber R.; De Boni, Leonardo; Figueiredo Neto, Antônio M.
Source:
Journal of physical chemistry 2020 v.124 no.12 pp. 6784-6795
ISSN:
1932-7455
Subject:
photons,   etc   ; anisotropy; magnetic fields; manganese; nanoparticles; optical properties; zinc;     Show all 7 Subjects
Abstract:
... Magnetic nanoparticles based on manganese–zinc ferrite presenting spherical and cubic shapes, verified by small-angle X-rays scattering, were studied by means of the hyper-Rayleigh scattering, the Z-Scan technique in the open-aperture configuration, and a spectrally resolved femtosecond transient absorption setup. Hyper-Rayleigh scattering and Z-Scan experiments were performed with applied magneti ...
DOI:
10.1021/acs.jpcc.9b10208

20. Nanosphere-Aggregation-Induced Reflection and Its Application in Large-Area and High-Precision Panchromatic Inkjet Printing

Author:
Wu, Yue; Ren, Jie; Zhang, Shufen; Wu, Suli
Source:
ACS applied materials & interfaces 2020 v.12 no.9 pp. 10867-10874
ISSN:
1944-8252
Subject:
photons,   etc   ; color; crystals; metals; mixing; photostability; printers; refractive index; toxicity;     Show all 9 Subjects
Abstract:
... Artificial structural colors have attracted more and more attention due to their high photostability, low toxicity, and brilliant colors. Inkjet printing of photonic crystals or amorphous photonic structures can realize large-scale structural color patterns, while plasma printing of metals can achieve high-precision color images. However, still no method is available to fabricate structural color ...
DOI:
10.1021/acsami.0c00547