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Luminescent nanomaterial powders having predetermined morphology and method of making

a technology of nanomaterials and powders, applied in the field ofluminescent nanomaterials, can solve the problems of reducing the efficiency of phosphor due to optical losses, unable to provide methods, and no method has yielded luminescent materials, and achieves high quantum efficiency and high absorption values

Inactive Publication Date: 2005-12-29
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The resulting nanomaterials exhibit reduced optical losses and enhanced efficiency in lighting applications, with quantum efficiency ranging from 80% to 100% and absorption values of at least 80%, outperforming traditional micron-sized materials.

Problems solved by technology

Since their dimension is more than, or of the same order of magnitude as ¼ wavelength of the absorbed incident radiation, emitted radiation, or both, the particles act as individual scattering centers for such radiation, thereby reducing the efficiency of the phosphor due to optical losses.
To date, however, none of the methods have yielded luminescent materials having selected morphologies that provide optimal efficiency and absorption.
Available synthesis methods fail to provide a method of making sub-micron size luminescent materials having tailored morphology that provides optimal efficiency and absorption.

Method used

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  • Luminescent nanomaterial powders having predetermined morphology and method of making
  • Luminescent nanomaterial powders having predetermined morphology and method of making
  • Luminescent nanomaterial powders having predetermined morphology and method of making

Examples

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example 1

[0035] Luminescent nanomaterial 100 was prepared using the following steps: forming a homogenized precursor solution of at least one lanthanide group metal precursor and at least one lanthanide series dopant precursor; adding a phosphate source and a fuel to the precursor solution; removing water from the precursor solution to leave a reaction concentrate; and igniting the reaction concentrate to form a powder comprising the plurality of nanoparticles.

[0036] A 10 g batch of the composition of gadolinium lanthanum phosphate doped with cerium and terbium having 37 mole percent lanthanum, 20 mole percent gadolinium, 28 mole percent cerium, and 15 mole percent terbium was prepared. A precursor solution was prepared by dissloving hexahydrate lanthanum nitrate (6.65 g), hexahydrate gadolinium nitrate (3.75 g), hexahydrate cerium nitrate (5.05 g), and pentahydrate terbium nitrate (2.71 g) in 20 ml of water. The precursor solution was then homogenized by stirring. The pH of the precursor s...

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Abstract

A method of making a luminescent nanomaterial having a plurality of nanoparticles. The luminescent nanomaterial includes at least one lanthanide group metal phosphate and at least one lanthanide series dopant, wherein each of the plurality of nanoparticles has a predetermined morphology. The luminescent nanomaterial has a high quantum efficiency and a high absorption value. The method yields a variety of morphologies and sizes of the plurality of nanoparticles. The particles size of the luminescent material varies from tens of nanometers to a few hundred of nanometers.

Description

BACKGROUND OF THE INVENTION [0001] The invention relates to luminescent nanomaterials. More particularly, the invention relates to luminescent nanomaterials comprising a plurality of nanoparticles. [0002] Luminescent materials, also known as phosphors, are used in lighting applications. Phosphors are responsible for nearly all the light output from the lamp. The efficiency of the phosphors to convert incident non-visible radiation into visible light depends on the size, shape, and morphology of the phosphor particles. Consequently, efforts have been directed toward producing luminescent materials with controlled properties. [0003] Currently, such luminescent materials comprise particles in the micron size regime. Since their dimension is more than, or of the same order of magnitude as ¼ wavelength of the absorbed incident radiation, emitted radiation, or both, the particles act as individual scattering centers for such radiation, thereby reducing the efficiency of the phosphor due t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C01B25/45C09K11/08C09K11/77C09K11/81
CPCB82Y20/00C09K11/7777B82Y30/00
Inventor KRISHNA, KALAGA MURALIMANOHARAN, MOHANKARAVOOR, GEETHASARASWAT, SHWETALOUREIRO, SERGIO PAULO MARTINS
Owner GENERAL ELECTRIC CO