Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12104/45558
Title: Uniform illumination of distant targets using a spherical light-emitting diode array
Author: Castaneda-Contreras, J.
Meneses-Nava, M.A.
Barbosa-García, O.
Chiu-Zarate, R.
Felix, M.V.
Rodriguez, R.
Issue Date: 2010
Abstract: The intensity of erbium up-conversion luminescence could be limited by a saturation effect due to increased pump power. We studied the luminescence saturation of the 550 nm emission on erbium-doped, SiO2TiO 2 solgel powders under pulsed excitation at 979 and 1532 nm. From the latter, the up-converted luminescence intensity decreased with increasing excitation power, whereas no saturation was observed at 979 nm excitation. We proposed that the saturation effect is determined by the pump power, the erbium content and the lifetime of the corresponding first excited states at different pumping schemes. " 2010 Elsevier B.V. All rights reserved.",,,,,,"10.1016/j.jlumin.2010.07.019",,,"http://hdl.handle.net/20.500.12104/45558","http://www.scopus.com/inward/record.url?eid=2-s2.0-77957754276&partnerID=40&md5=9a158146425d10a756ae6e614a46f488",,,,,,"12",,"Journal of Luminescence",,"2356
2361",,"130",,"Scopus
WOS",,,,,,"Erbium; Saturation; Solgel; Up-conversion luminescence",,,,,,"Up-conversion luminescence saturation under pulsed excitation of erbium-doped, SiO2TiO2 solgel powders",,"Article" "47323","123456789/35008",,"Moreno, I., Universidad Autonoma de Zacatecas, Unidad Academica de Fisica, Apdo.Postal C-580, 98060 Zacatecas, Zacatecas, Mexico; Muñoz, J., Universidad de Guadalajara, Centro Universitario de Los Lagos, Lagos de Moreno, Jalisco, Mexico; Ivanov, R., Universidad Autonoma de Zacatecas, Unidad Academica de Fisica, Apdo. Postal C-580, 98060 Zacatecas, Zacatecas, Mexico",,"Moreno, I.
Munoz, J.
Ivanov, R.",,"2007",,"An array of light-emitting diodes (LEDs) assembled upon a spherical surface can produce a wider angle distribution of light than a typical array (i.e., an array assembled by mounting LEDs into a flat surface). Arranging each single LED into an optimal placement, the uniformity of the illumination of a target can be improved. We derive approximate formulas and equations for the optimum LED-to-LED angular spacing of several spherical arrangements for uniform far-field irradiance. These design conditions are compact and simple tools that incorporate an explicit dependence on the half-intensity viewing angle (half width half maximum angle) of LEDs. " 2007 Society of Photo-Optical Instrumentation Engineers.
URI: http://hdl.handle.net/20.500.12104/45544
http://www.scopus.com/inward/record.url?eid=2-s2.0-34447283532&partnerID=40&md5=f00c0eb9bd6c7f98fc0e7f25528c9291
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