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Cover Picture: Phys. Status Solidi RRL 7‐8/2009
Publication year - 2009
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.200990009
Subject(s) - cover (algebra) , quantum efficiency , optoelectronics , photon , diode , light emitting diode , picture books , physics , materials science , computer science , engineering physics , optics , telecommunications , art , visual arts , engineering , mechanical engineering
The Rapid Research Letter by Regina Mueller‐Mach et al. on p. 215ff. gives a first account of a novel concept for making light emitting diodes (LEDs) at wavelengths at which neither InGaN nor AlGaInP ones are efficient, the so‐called yellow gap: A nitride phosphor with peak emission at 590 nm in the form of a dense ceramic – Lumiramic™ – is attached to a highly efficient blue emitting InGaN diode, so that all blue light is converted, i.e., full conversion is achieved. A total external quantum efficiency (amber photons per electron) of 32% has been reached; despite the huge quantum deficit and the low lumen equivalent, this results in 300% efficiency as compared to the best direct AlGaInP LED.