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Highly efficient all-nitride phosphor-converted white light emitting diode

✍ Scribed by Mueller-Mach, Regina ;Mueller, Gerd ;Krames, Michael R. ;Höppe, Henning A. ;Stadler, Florian ;Schnick, Wolfgang ;Juestel, Thomas ;Schmidt, Peter

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
207 KB
Volume
202
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

The development and demonstration of a highly efficient warm‐white all‐nitride phosphor‐converted light emitting diode (pc‐LED) is presented utilizing a GaN based quantum well blue LED and two novel nitrogen containing luminescent materials, both of which are doped with Eu^2+^. For color conversion of the primary blue the nitridosilicates M~2~Si~5~N~8~ (orange‐red) and MSi~2~O~2~N~2~ (yellow‐green), with M = alkaline earth, were employed, thus achieving a high luminous efficiency (25 lumen/W at 1 W input), excellent color quality (correlated color temperature CCT = 3200 K, general color rendering index Ra > 90) and the highest proven color stability of any pc‐LED obtained so far. Thus, these novel all‐nitride LEDs are superior to both incandescent and fluorescent lamps and may therefore become the next generation of general lighting sources. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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