Patent · US Active

Inorganic luminescent material for solid-state white-light sources

US8388862B2 · kind B2 · utility

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2Claims
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Inventors

Key dates

Filing dateJul 28, 2009
Grant dateMar 5, 2013
Priority date—
Expiry dateJul 28, 2029

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY02B20/00
  • WIPO fieldBasic materials chemistry
  • WIPO sectorChemistry

Abstract

InGaN-based blue LEDs and, specifically luminescent materials, are described containing yttrium oxide, oxides of rare earth metals, as well as aluminium oxide in proportions that yield a luminescent material whose average composition fits the general formula (Y1−x−yCexΣLny)3+αAl5O12+1.5α, where α—defines increase in stoichiometric index over the known value for yttrium-gadolinium garnet and varies between 0.033 and 2; x—is atomic fraction of cerium, 0.0001-0.1; ΣLny —is one or more lanthanides from the Gd, Tb, La, Yb group, whose atomic fraction in an yttrium sub-lattice is 0.01<Gd<0.70; 0.001<Tb<0.2; 0.001<La<0.1; 0.001<Yb<0.1, respectively, while the difference for all the compositions [1−x−y]>0.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.