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754 Newest Publications about the topic leds

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Emission band width approximation of light-emitting diodes in the region 350–2100nm

18-Jun-2017 | Author(s): Vladislav Galyanin, Vadim Belikov, Valeriya Belikova, Andrey Bogomolov, Sensors and Actuators B: Chemical, 2017

Publication date: November 2017 Source:Sensors and Actuators B: Chemical, Volume 252 Author(s): Vladislav Galyanin, Vadim Belikov, Valeriya Belikova, Andrey Bogomolov Emission spectrum of a light-emitting diode (LED) exhibits essential broadening as its central wavelength grows. ...

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Materials, Vol. 10, Pages 657: Warm White Light-Emitting Diodes Based on a Novel Orange Cationic Iridium(III) Complex

16-Jun-2017 | Tang, Huaijun ; Meng, Guoyun ; Chen, Zeyu ; Wang, Kaimin ; Zhou, Qiang ; Wang, Zhengliang, Materials, 2017

A novel orange cationic iridium(III) complex [(TPTA)2Ir(dPPOA)]PF6 (TPTA: 3,4,5-triphenyl-4H-1,2,4-triazole, dPPOA: N,N-diphenyl-4-(5-(pyridin-2-yl)-1,3,4-oxadiazol-2-yl)aniline) was synthesized and used as a phosphor in light-emitting diodes (LEDs). [(TPTA)2Ir(dPPOA)]PF6 has high thermal ...

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Concentration-Driven Selectivity of Energy Transfer Channels and Color Tunability in Ba3La(PO4)3:Tb3+, Sm3+ for Warm White LEDs

16-Jun-2017 | Weijie Zhou; Meng Gu; Yiyi Ou; Caihua Zhang; Xuejie Zhang; Lei Zhou; Hongbin Liang, Inorganic Chemistry, 2017

Here, we report the large-scale emission color tunability in Ba3La(PO4)3:Tb3+, Sm3+ (BLPO:TS) system based on the detailed discussion on the concentration-driven selectivity of energy transfer (ET) channels from Tb3+ to Sm3+. It is induced by the concentration-dependent 5D3 and 5D4 emissions of ...

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New copolymers with thieno[3,2‐b]thiophene or dithieno[3,2‐b:2′,3′‐d]thiophene units possessing electron‐withdrawing 4‐cyanophenyl groups: Synthesis and photophysical, electrochemical, and electroluminescent properties

14-Jun-2017 | Drahomír Výprachtický, Ilknur Demirtas, Vagif Dzhabarov, Veronika Pokorná, Erdal Ertas, Turan Ozturk, Věra Cimrová, Journal of Polymer Science Part A: Polymer Chemistry, 2017

ABSTRACT New monomers containing 4‐cyanophenyl (–PhCN) groups attached to a thieno[3,2‐b]thiophene (TT) or dithieno[3,2‐b:2′,3′‐d]thiophene (DTT) structure were synthesized and characterized as 4‐(2,5‐dibromothieno[3,2‐b]thiophen‐3‐yl)benzonitrile (Br–TT–PhCN) or ...

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Influence of Ce ion concentration on fluorescence properties of Ce:TAG‐Al2O3 eutectic mixed crystals

07-Jun-2017 | Chongjun He, Qinglin Sai, Changtai Xia, Huiling Hu, Crystal Research and Technology, 2017

Combining a blue LED chip with phosphor, white light can be obtained. In traditional white LEDs, the phosphor was dispersed in resin in a form of particles. Particle‐resin composite has complex packaging and poor thermal stability. For high‐power white LEDs, this combination cannot provide ...

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Impact of Light Intensity on Control in Photoinduced Organocatalyzed Atom Transfer Radical Polymerization

07-Jun-2017 | Matthew D. Ryan; Ryan M. Pearson; Tracy A. French; Garret M. Miyake, Macromolecules, 2017

Organic photoredox catalysts have been shown to operate organocatalyzed atom transfer radical polymerizations (O-ATRP) using visible light as the driving force. In this work, the effect of light intensity from white LEDs was evaluated as an influential factor in control over the polymerization ...

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A novel banded structure ceramic phosphor for high-power white LEDs

06-Jun-2017 | Ji-Yun Zhang; Zhaohua Luo; Haochuan Jiang; Jun Jiang; Chunhua Chen; Jingxian Zhang; Zhen-Zhen Gui, Chemical Communication, 2017

A novel banded structure ceramic phosphor has been fabricated in this research. This structure provides a convenient and effective method in regulating full spectrum. It has the advantage of being able to adjust the intensity of all three primary colors independently, regardless of the mutual ...

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Optimization of Current Injection in AlGaInP Core−Shell Nanowire Light-Emitting Diodes

31-May-2017 | Pyry Kivisaari; Alexander Berg; Mohammad Karimi; Kristian Storm; Steven Limpert; Jani Oksanen; Lars Samuelson; Håkan ..., Nano Letters, 2017

Core–shell nanowires offer great potential to enhance the efficiency of light-emitting diodes (LEDs) and expand the attainable wavelength range of LEDs over the whole visible spectrum. Additionally, nanowire (NW) LEDs can offer both improved light extraction and emission enhancement if the ...

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CdSe Nanoplatelet Films with Controlled Orientation of their Transition Dipole Moment

31-May-2017 | Yunan Gao; Mark C. Weidman; William A. Tisdale, Nano Letters, 2017

Using liquid–liquid interfacial assembly, we control the deposition of CdSe nanoplatelets into face-down or edge-up configurations. Controlled assembly, combined with back focal plane imaging, enabled unambiguous determination of the transition dipole orientation. The transition dipole moment of ...

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Effects of High‐g Impact on Physical, Electrical, and Optical Characteristics of Light‐Emitting Diodes

18-May-2017 | Xin Wen, Brandon Okraszewski, Pragun Babber, James Cash, Stephen Cain, David Klotzkin, Journal of Forensic Sciences, 2017

Abstract Previously, one of the tools available in automotive or aircraft accident analysis was the examination of the indicator bulbs. Currently, indicator bulbs have been largely replaced by light‐emitting diodes (LEDs). Here a series of studies was carried out on impact effects on LEDs to ...

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