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https://www.readbyqxmd.com/read/27914179/ammonothermal-synthesis-of-novel-nitrides-case-study-on-cagasin3
#1
Jonas Häusler, Lukas Neudert, Mathias Mallmann, Robin Niklaus, Anna-Carina L Kimmel, Nicolas S A Alt, Eberhard Schlücker, Oliver Oeckler, Wolfgang Schnick
The first gallium-containing nitridosilicate CaGaSiN3 was synthesized in newly developed high-pressure autoclaves using supercritical ammonia as solvent and nitriding agent. The reaction was conducted in ammonobasic environment starting from intermetallic CaGaSi with NaN3 as mineralizer. At 770 K, intermediate compounds were obtained, which were subsequently converted to the crystalline nitride at temperatures up to 1070 K (70 - 150 MPa). The impact of other mineralizers (e. g. LiN3, KN3 and CsN3) on the product formation was investigated as well...
December 3, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27911798/stretchable-multichannel-antennas-in-soft-wireless-optoelectronic-implants-for-optogenetics
#2
Sung Il Park, Gunchul Shin, Jordan G McCall, Ream Al-Hasani, Aaron Norris, Li Xia, Daniel S Brenner, Kyung Nim Noh, Sang Yun Bang, Dionnet L Bhatti, Kyung-In Jang, Seung-Kyun Kang, Aaron D Mickle, Gregory Dussor, Theodore J Price, Robert W Gereau, Michael R Bruchas, John A Rogers
Optogenetic methods to modulate cells and signaling pathways via targeted expression and activation of light-sensitive proteins have greatly accelerated the process of mapping complex neural circuits and defining their roles in physiological and pathological contexts. Recently demonstrated technologies based on injectable, microscale inorganic light-emitting diodes (μ-ILEDs) with wireless control and power delivery strategies offer important functionality in such experiments, by eliminating the external tethers associated with traditional fiber optic approaches...
November 28, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27911774/optically-transparent-semiconducting-polymer-nanonetwork-for-flexible-and-transparent-electronics
#3
Kilho Yu, Byoungwook Park, Geunjin Kim, Chang-Hyun Kim, Sungjun Park, Jehan Kim, Suhyun Jung, Soyeong Jeong, Sooncheol Kwon, Hongkyu Kang, Junghwan Kim, Myung-Han Yoon, Kwanghee Lee
Simultaneously achieving high optical transparency and excellent charge mobility in semiconducting polymers has presented a challenge for the application of these materials in future "flexible" and "transparent" electronics (FTEs). Here, by blending only a small amount (∼15 wt %) of a diketopyrrolopyrrole-based semiconducting polymer (DPP2T) into an inert polystyrene (PS) matrix, we introduce a polymer blend system that demonstrates both high field-effect transistor (FET) mobility and excellent optical transparency that approaches 100%...
November 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27910921/bipolar-and-unipolar-silylene-diphenylene-%C3%AF-%C3%AF-conjugated-polymer-route-for-highly-efficient-electrophosphorescence
#4
Yao-Tang Chang, Sunil Sharma, Miao-Ken Hung, Yu-Hsuan Lee, Show-An Chen
σ-π conjugated polymer strategy is proposed for designing electroluminescent host polymers with silylene-diphenylene as the backbone repeat unit giving a high triplet energy (ET = 2.67 eV). By incorporation of high ET (3.0 eV) electron (oxadiazole, OXD) and hole (triphenyl amine, TPA) transport moieties, or TPA alone (in this case, the main chain acts as electron transport channel) as side arms on the silylene, the high ET bipolar and unipolar polymers are formed, allowing a use of iridium green phosphor (Ir(ppy)2(acac), Ir-G) (ET = 2...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910398/development-of-beam-emission-spectroscopy-for-turbulence-transport-study-in-heliotron-j
#5
S Kobayashi, S Ohshima, H Matsuda, X X Lu, D Kokubu, K Ida, T Kobayashi, M Yoshinuma, S Kado, T Oishi, K Nagasaki, H Okada, T Minami, S Yamamoto, Y Nakamura, A Ishizawa, N Kenmochi, Y Otani, S Konoshima, T Mizuuchi
This paper describes the development study of the beam emission spectroscopy (BES) for the turbulent transport study in Heliotron J. Modification of the sightlines (10 × 4 for edge and 10 × 2 for edge) enables us to obtain 2-dimensional BES imaging. The cooling effect on the reduction in the electrical noise of avalanche photodiode (APD) assembly has been investigated using a refrigerant cooling system. When the temperature of the APD element has set to be -20 °C, the electrical noise can be reduced more than 50%...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910259/safety-efficacy-and-usage-compliance-of-home-use-device-utilizing-rf-and-light-energies-for-treating-periorbital-wrinkles
#6
Michael H Gold, Julie Biron, Liora Levi, Whitney Sensing
BACKGROUND: The aging process is often associated with undesirable effects on facial skin such as skin redundancy, reduction of elasticity, and increased wrinkling. Radiofrequency (RF) and light-emitting diodes (LEDs) are widely used, clinically proven technologies for skin rejuvenation. STUDY OBJECTIVE: This study aimed to evaluate the safety, efficacy, and usage compliance of the home-use device, utilizing RF and LED energies, for self-treatment of periorbital wrinkles and improvement of skin appearance...
December 2, 2016: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/27906783/evaluation-of-the-potential-optical-radiation-hazards-with-led-lamps-intended-for-home-use
#7
Robert H James, Robert J Landry, Bennett N Walker, Ilko K Ilev
The authors evaluated the potential for ocular damage from optical radiation emitted by Light Emitting Diode (LED) based lamps used for general illumination. Ten LED lamps were randomly selected off the shelf from a local home improvement store. The LEDs were behind diffusers in half of these lamps, while in the other half, the LEDs were clearly visible. In addition, a battery powered LED lantern having a LED source behind a diffuser was measured. The optical radiation emissions from two common incandescent lamps were also measured to compare the relative hazards of LED and incandescent lamps...
January 2017: Health Physics
https://www.readbyqxmd.com/read/27906475/direct-photoalignment-and-optical-patterning-of-molecular-thin-films
#8
Linus Pithan, Paul Beyer, Laura Bogula, Anton Zykov, Peter Schäfer, Jonathan Rawle, Chris Nicklin, Andreas Opitz, Stefan Kowarik
A novel strategy for direct photoalignment of molecular materials using optothermal re-orientation is introduced. Photoalignment for molecular materials such as the organic semiconductor tetracene is shown, without relying on additional photoreactive dopants or alignment layers. Patterning and polarized light emission, e.g., for polarized organic light emitting diodes is demonstrated.
December 1, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27906406/crystallization-assisted-nano-lens-array-fabrication-for-highly-efficient-and-color-stable-organic-light-emitting-diodes
#9
Young-Sam Park, Kyung-Hoon Han, Jehan Kim, Doo-Hee Cho, Jonghee Lee, Yoonjay Han, Jong Tae Lim, Nam Sung Cho, Byounggon Yu, Jeong-Ik Lee, Jang-Joo Kim
To date, all deposition equipment has been developed to produce planar films. Thus lens arrays with a lens diameter of <1 mm have been manufactured by combining deposition with other technologies, such as masks, surface treatment, molding etc. Furthermore, a nano-lens array (NLA) with a sufficiently small lens diameter (<1 μm) is necessary to avoid image quality degradation in high resolution displays. In this study, an organic NLA made using a conventional deposition technique - without combining with other techniques - is reported...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906390/flexible-all-solid-state-supercapacitors-based-on-polyaniline-orderly-nanotubes-array
#10
Huihua Li, Juan Song, Linlin Wang, Xiaomiao Feng, Ruiqing Liu, Wenjin Zeng, Zhendong Huang, Yanwen Ma, Lianhui Wang
Flexible all-solid-state supercapacitors are crucial to meet the growing needs for portable electronic devices such as foldable phones and wearable electronics. As promising candidates for pseudocapacitor electrode materials, polyaniline (PANI) orderly nanotube arrays are prepared via a simple template electrodeposition method. The structures of the final product were characterized using various characterization techniques, including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS)...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906378/cool-white-light-emitting-three-stack-oled-structures-for-amoled-display-applications
#11
Ramon Springer, Byoung Yeop Kang, Raju Lampande, Dae Hyun Ahn, Simone Lenk, Sebastian Reineke, Jang Hyuk Kwon
This paper demonstrates 2-stack and 3-stack white organic light-emitting diodes (WOLEDs) with fluorescent blue and phosphorescent yellow emissive units. The 2-stack and 3-stack WOLED comprises blue-yellow and blue-blue-yellow (blue-yellow-blue) combinations. The position of the yellow emitter and possible cavity lengths in different stack architectures are theoretically and experimentally investigated to reach Commission Internationale de L'Eclairage (CIE) coordinates of near (0.333/0.333). Here, a maximum external quantum efficiency (EQE) of 23...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27904413/influence-of-yellow-light-emitting-diodes-at-590-nm-on-storage-of-apple-tomato-and-bell-pepper-fruit
#12
Doris Kokalj, Janez Hribar, Blaž Cigić, Emil Zlatić, Lea Demšar, Lovro Sinkovič, Helena Šircelj, Grega Bizjak, Rajko Vidrih
The objective of this study is to investigate the effects of irradiation from light-emitting diodes (LEDs) on several fruits during storage. To improve storage and increase the contents of some bioactive compounds, apple, tomato and red bell pepper fruits were exposed to yellow light emitted from the diodes at 590 nm. The contents of ascorbic acid, total phenolics, total flavonoids and several pigments were investigated, along with the antioxidant potential. The colour parameters (L*, a* and b*) and firmness of the fruit were also determined...
June 2016: Food Technology and Biotechnology
https://www.readbyqxmd.com/read/27902781/correction-influence-of-light-emitting-diode-derived-blue-light-overexposure-on-mouse-ocular-surface
#13
Hyo Seok Lee, Lian Cui, Ying Li, Ji Suk Choi, Joo-Hee Choi, Zhengri Li, Ga Eon Kim, Won Choi, Kyung Chul Yoon
[This corrects the article DOI: 10.1371/journal.pone.0161041.].
2016: PloS One
https://www.readbyqxmd.com/read/27901534/structure-simplified-and-highly-efficient-deep-blue-organic-light-emitting-diodes-with-reduced-efficiency-roll-off-at-extremely-high-luminance
#14
Xiang-Long Li, Ming Liu, Yunchuan Li, Xinyi Cai, Dongcheng Chen, Kunkun Liu, Yong Cao, Shi-Jian Su
Based on a series of new fluorescent emitters, deep blue non-doped multilayer OLEDs with EQEs exceeding 5.10% and single layer devices excluding any charge carrier transporting materials with an EQE of 4.22% were obtained at an extremely high luminance of 10 000 cd m(-2).
November 30, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27901529/a-cationic-iridium-complex-meets-an-electron-transporting-counter-anion-enhanced-performances-of-solution-processed-phosphorescent-light-emitting-diodes
#15
Ningzi Luo, Ying Lan, Ruiren Tang, Lei He, Lian Duan
An electron-transporting counter-anion, OXD-7-SO3(-), was developed for a blue-green-emitting cationic iridium complex, which showed superior device performance in solution-processed phosphorescent light-emitting diodes over its counterpart complex with a PF6(-) counter-anion, due to the facilitated electron-injection/transport and more balanced carrier recombination imparted by OXD-7-SO3(-).
November 30, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27901155/syntheses-photoluminescence-and-electroluminescence-of-two-novel-platinum-ii-complexes
#16
Guang-Zhao Lu, Yan Li, Yi-Ming Jing, You-Xuan Zheng
Two new platinum(ii) cyclometalated complexes with 2-(4-trifluoromethyl)phenylpyridine (4-tfmppy) as the main ligand and tetraphenylimidodiphosphinate (tpip) (Pt-tpip) and tetra(4-fluorophenyl)imidodiphosphinate (ftpip) (Pt-ftpip) as ancillary ligands were developed. Both complexes were green phosphors with photoluminescence quantum efficiency yields of 71.5% and 79.2% in CH2Cl2 solution at room temperature, respectively. The organic light-emitting diodes with a double emissive layers structure of ITO/TAPC (1,1-bis(4-(di-p-tolylamino)phenyl)cyclohexane), 40 nm/Pt-tpip or Pt-ftpip: TcTa (4,4',4''-tri(9-carbazoyl)-triphenylamine) (5 wt%, 10 nm)/Pt-tpip or Pt-ftpip: 2,6DCzPPy (2,6-bis(3-(carbazol-9-yl)phenyl)pyridine) (5 wt%, 10 nm)/TmPyPB (1,3,5-tri(m-pyrid-3-yl-phenyl)benzene, 40 nm)/LiF (1 nm)/Al (100 nm) showed good performances...
November 30, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27901126/low-level-light-treatment-ameliorates-immune-thrombocytopenia
#17
Jingke Yang, Qi Zhang, Peiyu Li, Tingting Dong, Mei X Wu
Immune thrombocytopenia (ITP) is an immune-mediated acquired bleeding disorder characterized by abnormally low platelet counts. We reported here the ability of low-level light treatment (LLLT) to alleviate ITP in mice. The treatment is based on noninvasive whole body illumination 30 min a day for a few consecutive days by near infrared light (830 nm) transmitted by an array of light-emitting diodes (LEDs). LLLT significantly lifted the nadir of platelet counts and restored tail bleeding time when applied to two passive ITP models induced by anti-CD41 antibody...
November 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27901046/revealing-the-spin-vibronic-coupling-mechanism-of-thermally-activated-delayed-fluorescence
#18
Marc K Etherington, Jamie Gibson, Heather F Higginbotham, Thomas J Penfold, Andrew P Monkman
Knowing the underlying photophysics of thermally activated delayed fluorescence (TADF) allows proper design of high efficiency organic light-emitting diodes. We have proposed a model to describe reverse intersystem crossing (rISC) in donor-acceptor charge transfer molecules, where spin-orbit coupling between singlet and triplet states is mediated by one of the local triplet states of the donor (or acceptor). This second order, vibronically coupled mechanism describes the basic photophysics of TADF. Through a series of measurements, whereby the energy ordering of the charge transfer (CT) excited states and the local triplet are tuned in and out of resonance, we show that TADF reaches a maximum at the resonance point, substantiating our model of rISC...
November 30, 2016: Nature Communications
https://www.readbyqxmd.com/read/27900511/non-doped-deep-blue-and-doped-white-electroluminescence-devices-based-on-phenanthroimidazole-derivative
#19
Shuo Chen, Yukun Wu, Shoucheng Hu, Yi Zhao, Daining Fang
A novel deep-blue emitter PhImPOTD based on phenathroimidazole was synthesized, which is incorporated by an electron-donating dibenzothiophene unit and electron-withdrawing phenanthroimidazole and diphenylphosphine oxide moieties. Furthermore, the weak π-π stacking and intermolecular aggregation render the photoluminescence quantum yield is as high as 0.34 in the solid state. Non-doped organic light emitting diodes (OLEDs) based on PhImPOTD emitter exhibits a low turn-on voltage of 3.6 V, a favorable efficiency of 1...
November 29, 2016: Journal of Fluorescence
https://www.readbyqxmd.com/read/27900385/aggregation-enhanced-emission-active-tetraphenylbenzene-cored-efficient-blue-light-emitter
#20
Lingzhi Li, Han Nie, Ming Chen, Jingzhi Sun, Anjun Qin, Ben Zhong Tang
A tetraphenylbenzene (TPB) cored luminophore of TPB-AC with aggregation-enhanced emission characteristics was designed and synthesized. TPB-AC could be potentially applied for the fabrication of high performance organic light-emitting diodes (OLEDs) with blue light emission.
November 30, 2016: Faraday Discussions
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