Results 301 to 310 of about 634,808 (333)

Emission properties of white light of nanocrystals

2011 6th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, 2011
In this study, a series of colloidal ternary semiconductor Zn x Cd 1−x S nanocrystals are prepared. By controlling the ratios of Zn and Cd, the optical properties of the nanocrystals are modified. When Zn content is 0.5 and 0.8, their PL spectra exhibit two obvious emission peak, in which the narrow and the board bands are attributed to the band-edge ...
Shu-Ru Chung, Hong-Shou Chen, Kuan-Wen Wang   +2 more
openaire   +1 more source

White light emission from ultraviolet laser diode

Laser Physics, 2009
A phosphor-conversion white light using an InGaN laser diode that emits 405 nm near-ultraviolet (n-UV) light and phosphors that emit in the red/green/blue region when excited by the n-UV light was fabricated. The relationship of the luminous flux and the luminous efficacy of the white light with injection current were discussed. Based on the evaluation
Y. Xu, H. Hu, W. Zhuang, G. Song, Y. Li, L. Chen   +5 more
openaire   +1 more source

Polyfluorene based blends for white light emission

Organic Electronics, 2011
Abstract Single layer white light emitting diodes were constructed with blends containing as blue emitter and matrix host poly(9,9-dihexyl-2,7-fluorene) (LaPPS10), and the green and red emitters poly[(9,9-dihexyl-9H-fluorene-2,7-diyl)-1,2-ethenediyl-1,4-phenylene-1,2-ethenediyl] (LaPPS16) and poly[2-methoxy-5-(2-ethylhexoxy)-1,4-phenylene vinylene ...
Jeferson Ferreira de Deus, Gregório C. Faria, Eduardo T. Iamazaki, Roberto M. Faria, Teresa D.Z. Atvars, Leni Akcelrud   +5 more
openaire   +1 more source

Metal oxide nanostructures and white light emission

SPIE Proceedings, 2012
We report on white light emission from zinc oxide nanostructures chemically grown on paper substrates. The effect of the growth solution pH on the morphology is discussed. The light emission form light emitting diodes based on ZnO nanorods/organic polymer hybrids on paper substrate is presented. Further copper oxide was grown on the walls of zinc oxide
A. Zainelabdin, O. Nur, G. Amin, S. Zaman   +3 more
openaire   +1 more source

Near white light emission from ZnO nanostructures

MRS Proceedings, 2011
ABSTRACTWe report white light emission from ZnO nanostructures in powder form, prepared by microwave irradiation-assisted chemical synthesis, in the presence of a structure directing agent. Determination of their crystallinity, actual shape, and orientation was made using X-ray diffraction, scanning electron microscopy (SEM) and transmission electron ...
Sanjaya Brahma, P. Jaiswal, K. K. Nanda, L. M. Kukreja, S.A. Shivashankar   +4 more
openaire   +1 more source

Near white light emission of silicon nanocrystals

SPIE Proceedings, 2003
Silicon nanoparticles in the range from 2 nm to 5 nm was prepared from Zintl salt, soldium silicide (NaSi) by sonochemical method. This synthesis permits the reaction completed as fast as in a few hours and the easy alkyl-modification of nanocrystals surface at room temperature and ambient pressure.
Soojin Lee, Il-Ki Han, Woon-Jo Cho
openaire   +1 more source

White-light-emission Afterglow Phosphor CaZnGe2O6:Dy3+

Chemistry Letters, 2007
Abstract A novel phosphor, CaZnGe2O6:Dy3+, which emits white long-lasting phosphorescence (LLP) upon UV excitation, is prepared by a conventional high-temperature solid-state method, and its luminescent properties are systematically reported in this letter.
Guangbo Che, Chunbo Liu, Qingwei Wang, Zhanlin Xu   +3 more
openaire   +1 more source

Perovskite Crystals for Tunable White Light Emission

Chemistry of Materials, 2015
A significant fraction of global electricity demand is for lighting. Enabled by the realization and development of efficient GaN blue light-emitting diodes (LEDs), phosphor-based solid-state white LEDs provide a much higher efficiency alternative to incandescent and fluorescent lighting, which are being broadly implemented. However, a key challenge for
Sandeep Pathak, Nobuya Sakai, Florencia Wisnivesky Rocca Rivarola, Samuel D. Stranks, Jiewei Liu, Giles E. Eperon, Caterina Ducati, Konrad Wojciechowski, James T. Griffiths, Amir Abbas Haghighirad, Alba Pellaroque, Richard H. Friend, Henry J. Snaith   +12 more
openaire   +1 more source

White-Light Emission from Magic-Sized Cadmium Selenide Nanocrystals

Journal of the American Chemical Society, 2005
Magic-sized cadmium selenide (CdSe) nanocrystals have been pyrolytically synthesized. These ultra-small nanocrystals exhibit broadband emission (420-710 nm) that covers most of the visible spectrum while not suffering from self absorption. This behavior is a direct result of the extremely narrow size distribution and unusually large Stokes shift (40-50
Michael J, Bowers, James R, McBride, Sandra J, Rosenthal   +2 more
openaire   +2 more sources

Dynamic Fluctuations in Ultrasmall Nanocrystals Induce White Light Emission

Nano Letters, 2012
Individual ultrasmall CdSe nanocrystals have recently been found to emit white light, but the ultimate origin of the phenomenon has remained elusive. Here we use a combination of state-of-the-art experiment and theory to show that excitation sets the ultrasmall nanocrystals into a fluxional state.
Timothy J, Pennycook, James R, McBride, Sandra J, Rosenthal, Stephen J, Pennycook, Sokrates T, Pantelides   +4 more
openaire   +2 more sources