Southern Taiwan University of Science and Technology

科技英文

Light Emitting Diodes Development and Application

組別：第 5 組 組員：陳郅升 陳勁華 劉庭劭 黃信憲 陳俊安

Southern Taiwan University of Science and Technology

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Outline

History of LEDs LEDs production process Materials and Evolution Application of LEDs

Southern Taiwan University of Science and Technology

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History of LEDs

1. In the early 20th century,the first red LED was invented by GaAsP .

2. In the 20th century,the American RCA research team found that GaN can produce LEDs ,but the efficiency can not be improved.

3. In 1993,the Japan's Nichia Chemical Company solve the problem of efficiency and invented blue LEDs.

4. In the last 20th century ， white LEDs was invented.

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LEDs production process

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LEDs production process

Bulk Substrate

Crystal Growth & Machinin

g

Epitaxial Deposition of Light-Eimitting Diodes

Wafer Fabricatio

n

Die Fabricatio

n

Final Product

Assembly

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Chip process for LEDs

Epitaxy Wafer Clean Thermal annealing

Photolithography Dry etching Metal

deposition

Chip on wafer

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Materials and Evolution

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Materials

Wavelength:760~610 nm • AlGaAs、 GaAsP、 AlGalnP

Wavelength:590~570 nm • GaAsP、 AlGalnP

Wavelength:570~500 nm • lnGaN、 GaP、 AlGalnP、 AlGaP

Wavelength:500~450 nm• lnGaN、 SiC

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Southern Taiwan University of Science and Technology

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Evolution of LED

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Application of LEDs

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LED BLU market by application

Data source：Display Search

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LED in NB market

資料來源： Display Search

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9%

14%

24%27%

11%

14%

High bright LED market by application in the year 2011

Auto Other Backlight TV/Moniter

Mobile sign Lighting

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Conclusion

In recent years,more and more LED use in notebook computers backlight .

LED lighting devices in the future will replace the fluorescent.

In the future,LEDs will be more important.

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References

1. http://www.cnfi.org.tw/kmportal/front/bin/ptdetail.phtml?Category=100289&Part=magazine9505-434-8

2. http://spiderman186.pixnet.net/blog/post/58293438-2011-05-08-%E5%9B%9E%E9%A1%A7led%E7%94%A2%E6%A5%AD%E7%99%BC%E5%B1%95%E6%AD%B7%E7%A8%8B%E7%85%A7%E6%98%8E%E6%8A%80%E8%A1%93%E9%9C%80%E8%88%87%E7%90%86

3. http://www2.wunan.com.tw/download/preview/5d91.pdf4. http://ledeled.pixnet.net/blog/post/919155-led%E8%A3%BD%E7

%A8%8B5. http://www.sanlien.com/ad/san_tech.nsf/foundationview/41B76C

2DA5C4CEFD482577A5002C6D8D/$FILE/77-18-24.pdf6. http://www.china-led.net/info/2011812/2011812165345.shtml7. http://www.p-pension.com/pdf/no1/12.pdf

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Thanks for your attention !