Blue LEDs produce light by combining positive and negative charges within a gallium nitride crystal, resulting in blue photons. They were improved in 1990 with increased light output. Blue LEDs are made through a difficult process of growing gallium nitride to form a P-N junction. They are advantageous as they are environmentally friendly, durable, and operate at low power consumption. However, they are also difficult and expensive to produce initially. Blue LEDs are used in screens, lighting, sterilization, and to make white LEDs.

1. BLUE LED
Introduction
What is a BLUE LED:
● Here diode produces light by combining

2. Positive and negative charges inside GALLIUM
NITRIDE (GaN) crystal.
● We get resulting photons in the form of
BLUE in colour.
● In 1990 first BLUE LED with vastly
increased light output.
MAKING OF BLUE LED:

3. ● Gallium nitride (GaN), which is the material used
to create BLUE LEDS, is hard to grow.
● In order to make an LED we need to make P-N
junction meaning a later of p-type material
(positively doped) on type of n-type material
(Negatively doped).

4. IMAGE OF BLUE LED:

7. ADVANTAGES:
● Blue LEDs are environmental friendly.
● Small, durable & need little power.
● Operate at a safe & low power consumption.
● Require less energy to provide light.
● A Blue LED is necessary to make a white
LED.
● High life time. Slow failure.

8. DISADVANTAGE:
● Very difficult to produce than other LEDs.
● High initial price.
● Blue hazard cause light pollution.
● Electrical polarity only light with correct
electrical polarity
APPLICATION:
● Used in flat screens & data storage.

9. ● Used in accent lighting fixtures.
● It has been used to kill harmful bacteria that
can cause dental & skin problems.
● Used to make white LED.
● Used in sterilization & hygiene.
● To help conducting studies of electro
magnetic radiations.
REFERENCE:

10. ● Wikipedia of blue LED.
● Google.