Volume 19 Issue 07 2013 features 27 Slashing defect densities in nitride fi lms
Grown in an MOCVD reactor, nitride fi lms yield fewer defects than when they are formed in MBE chambers. But this gap in material quality can disappear with high-temperature ammonia MBE.
32 Cranking up the effi cacy of green LEDs
Green LEDs don’t deliver the same level of performance as their red and blue cousins. However, by decreasing the current density with a larger chip and optimising growth conditions it is possible to close that gap.
39 Pathways to adoption of solid-state lighting
Effi cent red, green and blue LEDs, growth on silicon and pumping phosphors with lasers are three promising options for driving down the cost of solid -state lighting and improving its colour quality.
43 Building brighter and cheaper UV LEDs
It is far more challenging to make a bright, cheap ultra-violet LED than one emitting in the blue. But success is promised with a transparent contact layer, refl ective electrodes, photonic structures and growth on silicon.
48 Diminishing droop with superior electron-blocking layers
It is very tricky to come up with a watertight explanation for the cause of LED droop but it is possible to combat this mysterious malady.
53 Time to get serious about standards?
Although spec sheets from different suppliers may indicate no difference in layer composition, that’s probably not the case unless reference standards are widely used.
56 Cuprous halides: The key ingredient for cheap, ultra-effi cient LEDs?
To propel widespread uptake of solid-state lighting, LEDs must be cheaper and more effi cient. One way is to switch the material to cuprous halides.
Volume 19 Issue 7 2013
Taking aim at the ‘Green Gap’
@compoundsemi
www.compoundsemiconductor.net
Making cheaper, brighter UV LEDs
MBE tools Higher temperatures slash defects
Setting standards for standards
news analysis 16 BinOptics eyes silicon photonics 18 Seren moves on 20 BluGlass raises LED ambitions
InAlN layer trims LED droop
Can I-VIIs propel LEDs to new highs?
News Review, News Analysis, Features, Research Review and much more. Free Weekly E News round up , go to
www.compoundsemiconductor.net
Magazine and Front Cover designed by Mitch Gaynor
research review 59 Simplifying gold-free technology for nitride HEMTs 60 Novel waveguide increases superluminescent output 61 Azzurro improves electroluminescence uniformity of large-diameter substrates
48 43 27
CONNECTING THE COMPOUND SEMICONDUCTOR COMMUNITY
contents
53 October 2013
www.compoundsemiconductor.net 5
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