THIS IS VERY USE FUL PPT

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

11. FUTURE PROSPECTS: