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).
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:
