BLUE LED
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This document summarizes a seminar presentation on blue LEDs. It discusses what LEDs and blue LEDs are, how gallium nitride is doped to produce blue light, the efficiency of blue LEDs, and their advantages like ability to store more information and lower power consumption. Applications mentioned include use in phones, tablets, laptops and TV screens. The document also notes key researchers who received the Nobel Prize for their work developing efficient blue LEDs and prospects for further improvements.
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An LED seminar was presented on blue LEDs. Blue LEDs work by recombining positive and negative charges in a gallium nitride crystal, producing blue photons. Developing efficient blue LEDs was challenging and required doping aluminum gallium nitride and indium gallium nitride alloys. Blue LEDs have advantages like storing more information than infrared light and lower power consumption. Applications include mobile phones, tablets, laptops and computer monitors. In the future, blue LED technology is expected to continue improving.
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BLUE LED
- 1. BLUE LED Seminar on Presented By V.SUNEEL REDDY Roll.No:11711A04B0 E.C.E DEPARTMENT NARAYANA ENGINEERING COLLEGE NELLORE
- 2. CONTENTS o What is an LED? o What is an BLUE LED? o Dopping of GaN o Efficiency o Advantages o Applications o Future Prospects
- 3. What is an LED? LED is abbreviated as Light Emitting Diode. When Positive and Negative charges are to be recombine in active layer there should be emit light. Depending upon the materials used in active layer the colour and wavelength will be changed.
- 4. • Here Diode produces light by combining Positive and negative charges inside GALLIUM NITRIDE(GaN) crystal. We get resulting photons in the form of BLUE in colour. What is an BLUE LED?
- 5. DOPING OF GALLIUM NITRIDE: • A difficult step in developing efficient BLUE LED’s was the growth and p- dopping alloys AlGaN, InGaN.
- 6. EFFICIENCY:
- 7. ADVANTAGES: • Blue light can store four times more information than infrared light. • Low power consumption. • Energy Saving
- 8. DISADVANTAGES • To make the diodes very difficult. • Expensive
- 9. APPLICATIONS: •Mobile Phones, Tablets, Laptops, Computer monitors and T.V Screens.
- 10. ISAMU AKASAKI HIROSHI AMANO SHUJI NAKAMURA NOBLE PRIZE WINNERS