Eie Materials, Inc.

Current Lighting Solutions, LLC

Kristen Baroudi

Jonathan Melman

Robert Nordsell

Yong Bok Go

Evan Thomas

Eric Bretschneider

Yuming Xie

Alan C Thomas

Green emitting phosphors have the empirical composition REAME, where RE may be one or more Rare Earth elements (for example, Eu or Gd), A may be one or more elements selected from the group Mg, Ca, Sr, or Ba, M may be one or more elements selected from the group Al, Ga, B, In, Sc, Lu or Y, E may be one or more elements selected from the group S, Se, O, or Te, w is greater than or equal to zero, or greater than or equal to 0.01, or greater than or equal to 0.05, and less than or equal to about 0.8, 2&#x2264;x&#x2264;4, and 4&#x2264;y&#x2264;7.

Phosphors with narrow green emission

Phosphors emitting green light over a narrow wavelength range may be used to broaden the gamut of display devices. In one aspect, a light emitting device comprises a light emitting solid state device emitting blue or violet light, a first phosphor that absorbs blue or violet light emitted by the light emitting solid state device and in response emits green light in a spectral band having a peak at wavelength &#x3bb;and a height of one half its peak on a long wavelength edge of the band at wavelength &#x3bb;; and a second phosphor that absorbs blue or violet light emitted by the light emitting solid state device and in response emits red light in a spectral band having a peak at wavelength &#x3bb;and a height of one half its peak on a short wavelength edge of the band at wavelength &#x3bb;. The ratio (&#x3bb;&#x2212;&#x3bb;)/(&#x3bb;&#x2212;&#x3bb;) is greater than 0.70.

Gamut broadened displays with narrow band green phosphors

In one aspect, a phosphor converted white light LED comprising a narrow green phosphor rather than a conventional broad green phosphor may simultaneously exhibit high R9, and high Luminance Efficacy of Radiation, optionally without use of a deep red phosphor to maintain desired red color rendering. In another aspect, a phosphor converted white light LED comprising a narrow green phosphor rather than a conventional broad green phosphor may provide an emission spectrum exhibiting a significant dip in the yellow region of the spectrum and thereby provide high red-green contrast without use of a filter. The yellow dip may be shallower than in conventional devices, and the device may therefore be brighter, while maintaining desired CRI and R9.

Phosphor-converted white light emitting diodes having narrow-band green phosphors

A luminescent composition of matter is characterized by the formula REME, where RE may be one or more Rare Earth elements (for example, Eu or Gd), M may be one or more elements selected from the group Al, Ga, B, In, Sc, Lu, and Y; E is one or more elements selected from the group S, Se, O, and Te; x is greater than zero; and y has the value that achieves charge balance in the formula assuming that E has a charge of &#x2212;2.

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Lexington, KY, United States of America

Kristen Baroudi