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

Patent ·
OSTI ID:1470732
; ; ; ;
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.
Research Organization:
EIE Materials, Inc., Lexington, KY (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
EE0007622
Assignee:
EIE Materials, Inc. (Lexington, KY)
Patent Number(s):
10,056,530
Application Number:
15/679,021
OSTI ID:
1470732
Country of Publication:
United States
Language:
English

References (5)

Investigations of the MSAl2S3 systems () and luminescence properties of europium-doped thioaluminates journal September 1992
The Synthesis and Photoluminescence of  M  II  M 2 III  (  S  , Se ) 4 journal January 1974
Luminescence properties of stoichiometric EuM2S4 (M = Ga, Al) conversion phosphors for white LED applications journal August 2012
Efficient Mn(IV) Emission in Fluorine Coordination journal January 1973
Robust and Stable Narrow-Band Green Emitter: An Option for Advanced Wide-Color-Gamut Backlight Display journal October 2016

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36 MATERIALS SCIENCE