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1. 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

2. 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

3. NIR-to-visible upconversion in quantum dots via a ligand induced charge transfer state

Author:
Meir, Noga; Pinkas, Iddo; Oron, Dan
Source:
RSC advances 2019 v.9 no.21 pp. 12153-12161
ISSN:
2046-2069
Subject:
photons,   etc   ; ligands; quantum dots; thiols;     Show all 4 Subjects
Abstract:
... Nanomaterials that possess the ability to upconvert two low-energy photons into a single high-energy photon are of great potential to be useful in a variety of applications. Recent attempts to realize upconversion (UC) in semiconducting quantum dot (QD) systems focused mainly on fabrication of heterostructured colloidal double QDs, or by using colloidal QDs as sensitizers for triplet–triplet annih ...
DOI:
10.1039/c9ra01273g

4. Photo-Controlled Ferroelectric-Based Nanoactuators

Author:
Rubio-Marcos, Fernando; Páez-Margarit, David; Ochoa, Diego A.; Del Campo, Adolfo; Fernández, José F.; García, José E.
Source:
ACS applied materials & interfaces 2019 v.11 no.15 pp. 13921-13926
ISSN:
1944-8252
Subject:
photons,   etc   ; energy; lighting; materials science;     Show all 4 Subjects
Abstract:
... Finding a feasible principle for a future generation of nano-optomechanical systems is a matter of intensive research, because it may provide new device prospects for optoelectronics and nanomanipulation techniques. Here we show that the strain of a ferroelectric crystal can be manipulated to achieve macroscopic, stable, and reproducible dimensional changes using illumination with photon energy be ...
DOI:
10.1021/acsami.9b01628

5. MoSe₂–Cu₂S Vertical p–n Nanoheterostructures for High-Performance Photodetectors

Author:
Hassan, Md. Samim; Bera, Susnata; Gupta, Divya; Ray, Samit K.; Sapra, Sameer
Source:
ACS applied materials & interfaces 2019 v.11 no.4 pp. 4074-4083
ISSN:
1944-8252
Subject:
photons,   etc   ; copper; molybdenum; selenium; sulfides;     Show all 5 Subjects
Abstract:
... Heterostructures based on atomically thin two-dimensional layered transition metal dichalcogenides are highly promising for optoelectronic device applications owing to their tunable optical and electronic properties. However, the synthesis of heterostructures with desired materials having proper interfacial contacts has been a challenging task. Here, we develop a colloidal synthetic route for the ...
DOI:
10.1021/acsami.8b16205

6. Strong exciton–photon coupling and polariton lasing in GaN microrod

Author:
Ghosh, Poulami; Yu, Dapeng; Hu, Tao; Liang, Jing; Chen, Zhanghai; Yingkai, Liu; Huang, Mingyuan
Source:
Journal of materials science 2019 v.54 no.11 pp. 8472-8481
ISSN:
0022-2461
Subject:
photons,   etc   ; ambient temperature; energy; vapors; wavelengths;     Show all 5 Subjects
Abstract:
... We report on the studies of strong exciton photon coupling and polariton lasing at room temperature from single GaN microrods grown by metal-organic vapor phase epitaxy technique. Emission spectra were recorded at room temperature by exciting GaN microrods with pulsed Nd:YAG laser of 355 nm wavelength at different excitation power density. Clear mode formation corresponding to Whispering gallery m ...
DOI:
10.1007/s10853-019-03493-w

7. Study of the magneto-electronic, optical, thermal and thermoelectric applications of double perovskites Ba₂MTaO₆ (M = Er, Tm)

Author:
Nabi, Muskan; Gupta, Dinesh C.
Source:
RSC advances 2019 v.9 no.28 pp. 15852-15867
ISSN:
2046-2069
Subject:
photons,   etc   ; alloys; energy; models; temperature; thermodynamics;     Show all 6 Subjects
Abstract:
... The structural, electronic, optical, thermodynamic and thermoelectric properties of double perovskites Ba₂MTaO₆ (M = Er, Tm) have been studied. These alloys stabilize in cubic structure with paramagnetic phases and structural parameters that are in good agreement with experimental results. The elastic parameters reveal both materials as being super hard and brittle in nature. The band profile disp ...
DOI:
10.1039/c9ra01797f

8. The electronic structure and the formation of polarons in Mo-doped BiVO₄ measured by angle-resolved photoemission spectroscopy

Author:
Mohamed, Mansour; May, Matthias M.; Kanis, Michael; Brützam, Mario; Uecker, Reinhard; van de Krol, Roel; Janowitz, Christoph; Mulazzi, Mattia
Source:
RSC advances 2019 v.9 no.27 pp. 15606-15614
ISSN:
2046-2069
Subject:
photons,   etc   ; electrons; energy; mixing; molybdenum; spectroscopy;     Show all 6 Subjects
Abstract:
... We experimentally investigated the electronic structure of Mo-doped BiVO₄ high-quality single-crystals with synchrotron radiation-excited angle-resolved photoelectron spectroscopy (ARPES). By photon-energy dependent ARPES, we measured the bulk-derived valence band dispersion along the direction normal to the (010) cleavage plane, while the dispersion along the in-plane directions is obtained by an ...
DOI:
10.1039/c9ra01092k

9. Photonic crystal and plasmonic nanohole based label-free biodetection

Author:
Cetin, Arif E.; Topkaya, Seda Nur
Source:
Biosensors & bioelectronics 2019 v.132 pp. 196-202
ISSN:
0956-5663
Subject:
photons,   etc   ; biosensors; crystals; monitoring; refractive index;     Show all 5 Subjects
Abstract:
... Photonic crystals and plasmonic nanohole arrays are the conventional substrates for label-free biodetection applications. In this article, we readdressed these systems in terms of their sensing capability and provided a broad picture for a selection mechanism of optimum parameters providing strong sensing signals. We first investigated the physical origin of the transmission resonances supported b ...
DOI:
10.1016/j.bios.2019.02.047

10. Electrospinning and Electrospun Nanofibers: Methods, Materials, and Applications

Author:
Xue, Jiajia; Wu, Tong; Dai, Yunqian; Xia, Younan
Source:
Chemical reviews 2019 v.119 no.8 pp. 5298-5415
ISSN:
1520-6890
Subject:
photons,   etc   ; electronic equipment; energy; engineering; nanofibers;     Show all 5 Subjects
Abstract:
... Electrospinning is a versatile and viable technique for generating ultrathin fibers. Remarkable progress has been made with regard to the development of electrospinning methods and engineering of electrospun nanofibers to suit or enable various applications. We aim to provide a comprehensive overview of electrospinning, including the principle, methods, materials, and applications. We begin with a ...
DOI:
10.1021/acs.chemrev.8b00593

11. Patterned Full-Color Reflective Coatings Based on Photonic Cholesteric Liquid-Crystalline Particles

Author:
Belmonte, Alberto; Bus, Tom; Broer, Dirk J.; Schenning, Albert P.H.J.
Source:
ACS applied materials & interfaces 2019 v.11 no.15 pp. 14376-14382
ISSN:
1944-8252
Subject:
photons,   etc   ; coatings; color; cost effectiveness; dyes; emulsifying;     Show all 6 Subjects
Abstract:
... An easy approach to pattern angular-independent, multicolor reflective coatings based on cholesteric liquid-crystalline (CLC) particles is presented. CLC particles are fabricated by emulsification, which is a scalable, cost-effective, and environmentally friendly synthesis process. The photonic particles can be easily dispersed in a binder to produce reflective coatings. Furthermore, a simple stra ...
DOI:
10.1021/acsami.9b02680

12. Rapid Fabrication of Noniridescent Structural Color Coatings with High Color Visibility, Good Structural Stability, and Self-Healing Properties

Author:
Meng, Fantao; Umair, Malik Muhammad; Iqbal, Kashif; Jin, Xin; Zhang, Shufen; Tang, Bingtao
Source:
ACS applied materials & interfaces 2019 v.11 no.13 pp. 13022-13028
ISSN:
1944-8252
Subject:
photons,   etc   ; coatings; color; fabrics; microparticles; paints; polymers;     Show all 7 Subjects
Abstract:
... Artificial construction of amorphous photonic structures (APSs) is an important approach for obtaining noniridescent structural colors and shows a great potential for practical applications in paints, textile coloring, display, or other color-related fields. However, the structural colors are usually dim because of the influence of incoherent scattering, and the point contact among the microsphere ...
DOI:
10.1021/acsami.9b01522

13. Enhanced photoluminescence of LEuH nanosheets: 2D photonic crystals self-assembled by core–shell SiO₂@LEuH spheres

Author:
Wang, Xinying; Feng, Pingping; Shao, Baiyi; Cui, Fangming; Yang, Xiaojing
Source:
RSC advances 2019 v.9 no.14 pp. 8131-8136
ISSN:
2046-2069
Subject:
photons,   etc   ; crystals; europium; hydroxides; nanosheets; photoluminescence; quartz;     Show all 7 Subjects
Abstract:
... The enhancement in photoluminescence (PL) is a challenge for layered rare-earth hydroxides, which usually have weak PL due to the quenching effect of hydroxyls. In this work, we provide a strategy to enhance the PL behavior by constructing two-dimensional (2D) photonic crystals. The core–shell structured SiO₂@LEuH spheres were prepared by attaching the positively charged layered europium hydroxide ...
DOI:
10.1039/c9ra00543a

14. Sensitizing Singlet Fission with Perovskite Nanocrystals

Author:
Lu, Haipeng; Chen, Xihan; Anthony, John E.; Johnson, Justin C.; Beard, Matthew C.
Source:
Journal of the American Chemical Society 2019 v.141 no.12 pp. 4919-4927
ISSN:
1520-5126
Subject:
photons,   etc   ; energy transfer; lead; nanocrystals; semiconductors;     Show all 5 Subjects
Abstract:
... The marriage of colloidal semiconductor nanocrystals and functional organic molecules has brought unique opportunities in emerging photonic and optoelectronic applications. Traditional semiconductor nanocrystals have been widely demonstrated to initiate efficient triplet energy transfer at the nanocrystal–acene interface. Herein, we report that unlike conventional semiconductor nanocrystals, lead ...
DOI:
10.1021/jacs.8b13562

15. Structural Color Circulation in a Bilayer Photonic Crystal by Increasing the Incident Angle

Author:
Wu, Suli; Liu, Tengfei; Tang, Bingtao; Li, Lu; Zhang, Shufen
Source:
ACS applied materials & interfaces 2019 v.11 no.10 pp. 10171-10177
ISSN:
1944-8252
Subject:
photons,   etc   ; angle of incidence; color; crystals; silica;     Show all 5 Subjects
Abstract:
... Photonic crystals (PCs) have been widely applied in the anticounterfeiting field according to their easily tunable and angle-dependent structural colors. However, most studies are now focused on single-layer PCs assembled from monodisperse colloidal spheres, which have only one bandgap. Here, we prepared bilayer photonic crystal films by choosing 250 and 330 nm silica spheres as the bottom and top ...
DOI:
10.1021/acsami.8b21092

16. NIR absorbing ortho-π-extended perylene bisimide as a promising material for bulk heterojunction organic solar cells

Author:
Regar, Ramprasad; Mishra, Ruchika; Singhal, Rahul; Sharma, Ganesh D.; Sankar, Jeyaraman
Source:
Journal of materials chemistry A 2019 v.7 no.7 pp. 3012-3017
ISSN:
2050-7496
Subject:
photons,   etc   ; absorption; electric potential difference; solar cells;     Show all 4 Subjects
Abstract:
... Herein, we demonstrate the potential of a DBU-appended perylene bisimide (PDIDBU) in solution processed bulk-heterojunction organic solar cells (BHJOSCs). This molecule exhibits intense absorption in the visible to near infra-red region (300–1000 nm). The conventional BHJOSCs show a power conversion efficiency of up to 6.96% with an open circuit voltage of 0.75 V and a record low energy loss of 0. ...
DOI:
10.1039/c8ta10982f

17. Isoquinoline gas-phase absorption spectrum in the vacuum ultraviolet between 3.7 and 10.7 eV. New valence and Rydberg electronic states

Author:
Leach, Sydney; Jones, Nykola C.; Hoffmann, Søren V.; Un, Sun
Source:
RSC advances 2019 v.9 no.9 pp. 5121-5141
ISSN:
2046-2069
Subject:
photons,   etc   ; absorption; cations; gases; quinoline; spectral analysis;     Show all 6 Subjects
Abstract:
... VUV photons from a synchrotron source were used to record the gas-phase absorption spectrum of isoquinoline over the range 3.5 to 10.7 eV. The rich spectrum exhibits both broad and sharp features, of varying intensities, that are analyzed into eight valence and eight Rydberg transitions. Previous data on the valence transitions of isoquinoline were essentially limited to solution spectra up to 5.4 ...
DOI:
10.1039/c8ra09725a

18. Perfect light absorption in graphene by two unpatterned dielectric layers and potential applications

Author:
Zhu, Jinfeng; Li, Chawei; Ou, Jun-Yu; Liu, Qing Huo
Source:
Carbon 2019 v.142 pp. 430-437
ISSN:
0008-6223
Subject:
photons,   etc   ; absorption; absorptivity; cost effectiveness; graphene;     Show all 5 Subjects
Abstract:
... In the spectral range from ultraviolet to near infrared, graphene lacks the capability to support plasmon polaritons, and has low optical absorptivity for applications due to its extremely small thickness. Many photonic structures based on sophisticated nanofabrication or metal plasmonics have been adopted to conquer this limitation, but they suffer from high expenses or metal parasitic losses. He ...
DOI:
10.1016/j.carbon.2018.10.073

19. Air-Curable, High-Resolution Patternable Oxetane-Based Liquid Crystalline Photonic Films via Flexographic Printing

Author:
Hoekstra, Davey C.; Nickmans, Koen; Lub, Johan; Debije, Michael G.; Schenning, Albert P. H. J.
Source:
ACS applied materials & interfaces 2019 v.11 no.7 pp. 7423-7430
ISSN:
1944-8252
Subject:
photons,   etc   ; aesthetics; coatings; color; liquid crystals;     Show all 5 Subjects
Abstract:
... The production of patterned photonic films on a large scale remains a challenge. Here, we report on a new class of photonic materials that are based on oxetane liquid crystals (LCs). Patterned reflective coatings can be produced from these materials on flexible substrates by using flexographic printing. This industrially relevant process allows for upscaling in future applications. Furthermore, th ...
DOI:
10.1021/acsami.8b21464

20. Effect of Strongly Coupled Vibration–Cavity Polaritons on the Bulk Vibrational States within a Wavelength-Scale Cavity

Author:
Erwin, Justin D.; Smotzer, Madeline; Coe, James V.
Source:
TheJournal of physical chemistry 2019 v.123 no.6 pp. 1302-1306
ISSN:
1520-5207
Subject:
photons,   etc   ; deformation; liquids; physical chemistry; vibration;     Show all 5 Subjects
Abstract:
... A Rabi splitting of 43.0 ± 1.0 cm–¹ (95% conf.) was determined for the interaction of the CD₃ deformation, the strongest fundamental vibration of the liquid CD₃C≡N molecule and fringe modes of a parallel-plate Fabry–Pérot cavity containing this liquid. Note that vibration–cavity polaritons are also called dressed states, hybrid or mixed states. Since the experimental configuration has many orders ...
DOI:
10.1021/acs.jpcb.8b09913