Monday, June 28, 2004

[ODCAD]Spin on inorganic semiconductor

Did I make mistake in typing "inorganic"? No, it is true. Spin techlogy is usually regarded as a cheap method to deposite organic material because organic material can be dissovled in popular solvent. Si based inorganic semiconductor is covalent bond, and it has very low slubility in virtually any solvent. However, some inorganic material such as chalcoginide has relatively weak bond compared with Si. IBM's T.J. Watson Resaerch Center has discovered that this type of material may be dissolved in solvent hydrazine (N2H4) with other adding chemical. for example, Sn(S)y(Se)x can be dissovleved when extra solfur is added. The solution then is spin on substrated. After baking, the solvent and extra sulfur is evaporated. This results in very thin semiconductor Sn(S)y(Se)x.

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Monday, June 07, 2004

[ODCAD] Sharp-Blue Laser Diodes

Blue-violet Laser Diode is one of the components used in next generation of DVD. This high density (27 gigabits/disc) DVD requires Blue laser light to record digital information. The lab of Sharp in UK has developed a method to make this diode. The material is Indium-Gallium-Nitride (InGaN). This lab used a technique of molecular beam epitaxy (MBE). Sharp has already used this technique to manufacture Red laser diodes. This new method can compete with the others[1] that have been protected by patents.

1. Blue-laser using metal organic chemical vapor deposition developed by Shuji Nakamura, Nichia Corp, Tokushima, Japan
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Friday, June 04, 2004

[ODCAD] Samsung-OLED competing with LCD

Source from ZDet UK on May 18, 2004

Samsung SDI, the Korean giant's display division, has announced prototypes of a 17-inch active matrix organic light emitting diode (OLED) display. Due for launch next year, the display has a resolution of 1600x1200 pixels and a brightness of 400 lumens, and is the largest OLED matrix display to date according to the company.

It will consume no more power than a 15-inch display and be a third of the thickness of existing LCD models, the company said. The prototype will be shown at the 2004 Society for Information Display (SID) conference, taking place from 25th May in Seattle.

The displays are made using a transfer technology developed by Samsung and 3M, where the pattern of plastic pixels on the screen is printed by scanning a laser across a set of organic films. This can produce a larger screen than is possible by the alternative method of spraying the plastic through a patterned shadow mask, says the company, while allowing a similar precision.

Organic LEDs are luminescent plastic semiconductors with the theoretical potential to replace LCDs, CRTs and other display technologies through greater efficiency, easier production, more physical flexibility and lower cost. To date, however, problems with device lifetime, chemistry and production have limited their use to mobile devices and backlights. Samsung's basic OLED technology was licenced from Kodak and developed in conjunction with NEC, which sold its stake in the joint venture to Samsung at the beginning of 2004.

Tuesday, June 01, 2004

[ODCAD] Events in June, 2004

Asia: Tokyo, Japan, June 7, 2004 CIE Expert Symposium on LED Light Sources: Tokyo, Japan, more information

Asia: Taiwan, June 9-12,2004 Display Taiwan 2004
Taipai,Twain, for more informationn email

US Bay area: Jun. 17, 6:00-9:00PM, PMIEEE EDS/SCV Evening Seminar in Bay area, CA, National Semiconductor, Building 31, 955 Kifer Rd. Sunnyvale, CA

Europa: Germany, June 20, 2004, 7th International Conference on Nanostructured Materials, Wiesbaden, Germany, more information

Asia: Tokyo, Japan, June 30,2004, 14th FPD Manufacturing Technology Expo & Conference/Finetech, Tokyo, Japan, more information

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