LEDs ♦ news digest
PHABLE is a novel mask based photolithography technology that hopes to revolutionise production of photonic structures such as photonic crystals, diffraction gratings and anti-reflection surfaces. High-throughput fabrication of such patterns over large areas is required for fabrication of high performance future devices in fields including LEDs, solar cells and flat-screen displays. PHABLE technology involves a mask being illuminated with a UV beam to form a high resolution image that has a very large depth of focus. Therefore substrates with non flat surfaces can be patterned easily. The high- resolution mask with the same 4-inch area as the final pattern was produced by DNP on a standard quartz/Cr plate. UV photolithography exposures were performed on a PHABLE-R lithography tool made by Eulitha.
Photonic crystal patterns consisting of circular holes on a 600-nm period hexagonal lattice were printed in a commercially available photoresist coated on silicon wafers. The produced patterns were highly uniform over the whole 4” area of the wafers. Demonstration of uniform patterning on 4” substrates is an important milestone as most targeted applications require patterning of large areas. For example, the high brightness LED industry is switching to 4” and 6” wafers from the traditional 2” base. Photonic crystal structures that enhance light extraction in LEDs or patterned sapphire substrates that improve performance of LEDs grown on them can be fabricated with the PHABLE technology. Similarly, substrates required for nanowire based LED or solar cell applications can be produced with this technology. Eulitha currently offers samples and wafer batch processing services to companies and researchers developing nanostructure-based products. It is also currently offering laboratory lithography tools for 2”to 4” wafers that are suitable for product development.
HB-LED Market to Hit $46.05 billion in 2020
The report “Global Market Review and Forecast (2010-2020)” says the use of HB-LEDs in mobile/ portable devices will remain a strong segment although OLEDs continue to take market share.
Market research firm ElectroniCast Consultants, has released a market review and forecast of the global consumption of packaged High Brightness Light Emitting Diodes (HB-LEDs).
The review of 2010 plus the market forecast (2011- 2020) is presented for HB- LEDs with a lumens/ Watt rating of 30 to 70 lm/W, as well as HB-LEDs with a lumens/Watt rating of over 70 lm/W.
According to ElectroniCast, the global consumption of packaged HB-LEDs in 2010 was $10.09 billion. In the year 2020, the worldwide consumption value is forecast to reach $46.05 billion (see Figure).
January / February 2011
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