Synthesis and properties of rare earth doped lamp phosphors

Abstract

Red, blue and green emitting lamp phosphors such as Eu 3+ doped Y20~ (red phosphor), Eu 2÷ doped Bao.64A112018,64 , BaMgAlloOl~ and BaMg2A116027 (blue phosphors) and Ceo.67Tbo.33MgAlllO19 and Eu 2+, Mn 2+ doped BaMgA110017 (green phosphors) have been prepared by the combustion of the corresponding metal nitrates (oxidizer) and oxalyl dihydrazide/urea/carbohydrazide (fuel) mixtures at 400°-500°C within 5 rain. The formation of these phosphors has been confirmed by their characteristic powder X-ray diffraction patterns and fluorescence spectra. The phosphors showed characteristic emission bands at 611 nm (red emission), 430-450 nm (blue emission) and 515-540 nm (green emission). The fine-particle nature of the combustion derived phosphors has been investigated using powder density, particle size and BET surface area measurements.

Combustion synthesis and characterization of new class of ZnO-based ceramic pigments

“…O:F = 1.0 [6,7], and the energy released is at a maximum. According to the concept used in propellant chemistry, the elements H, C or any other metal are considered as reducing elements with the 0925-8388/$ -see front matter © 2004 Elsevier B.V. All rights reserved.…”

Investigation of 515nm green-light emission for full color emission LaAlO3 phosphor with varied valence Eu

“…Multi-component phosphors with different visible light emissions are used to combine white light as excited by ultraviolet (UV) or blue light. For examples, the commonly used fluorescence lamp combines tri-color phosphors with mercury, and the recently arisen high color rendering index (CRI) white light emitting diode (LED) encapsulates green and red phosphors with InGaN blue chip [1][2][3][4][5]. Disadvantages, however, including light re-absorption among phosphor particles and complex blending operation usually lead to a decrease in the device efficiency for the colormix model.…”

A rapid combustion process for the preparation of MgSrAl10O17:Eu2+ phosphor and related luminescence and defect investigations

“…Patil and Ekambaram [19] reported the specific surface areas of BaMgAl 10 O 17 :Eu phosphor prepared by the urea process to be 10 m 2 /g. MgSrAl 10 O 17 :Eu phosphor has lower BET surface area.…”

“…Analytical [19,20]. These five materials were mixed to get a product of chemical formula Mg 1Àx Eu x SrAl 10 O 17 , where x=0.01-0.10.…”