OLEDs emit light when electricity is applied to a film of organic material. They have faster response times than LEDs and can be made transparent or flexible. An OLED is made of an emissive organic layer sandwiched between a cathode and anode. When voltage is applied, electrons from the cathode combine with holes from the anode in the emissive layer, emitting light. OLEDs are being used in TVs, phones, and other devices but have shorter lifetimes than LEDs, especially for blue colors.

1. VYASINSTITUTEOF ENGINEERING& TECHNOLOGY
Jodhpur(Rajasthan)
AffliatedTo
RajasthanTechnicalUniversity (RTU),Kota
SEMINAR ON
ORGANIC LIGHT EMITTING DIODE
(OLED)

2. What is an OLED?
OLED – Organic Light Emitting Diode
An OLED is a light emitting diode(LED)
Which work on the principle of
electroluminescent layer is composed of a
film of organic material.

3. •Electroluminescence (EL)
is an optical phenomenon and
electrical phenomenon in which
a material emits light in
response to an electric current
passed through it, or to a strong
electric field

4. WORKING PRINCIPLE
•A voltage is applied across the anode and cathode.
•Current flows fro cathode to anode through the organic layers.
•Electrons flows to emissive layer from the cathode.
•Electrons are removed from conductive layer leaving holes. into
emissive layer.
•Electron and hole combine and light emitted
•Holes jump into emissive layer.
•Electron and hole combine and light emitted.

6. ARCHITECTURE OF OLED
•CATHODE
•ORGANIC LAYER
1. Emisssive layer
2. Conductive layer
•ANODE
•SUBSTRATE

7. TYPES OF OLED
Passive OLEDs
•The Organic layer is between
cathode & anode run
perpendicular.
•Easy to make.
•Use more power.
•Best for small screens.

8. Active OLEDs
•Full layers of cathode and
anode
•Anode over lays a thin film
transistor(TFT)
•Requires less power
•Higher refresh rates
•Suitable for large screens

9. APPLICATION OF OLED
•Televisions(Samsung, LG ,
MI, Etc.)
•Smart Phone Screens
(Samsung, Iphone Etc.)
•Portable Devices Displays
(Samsung Gear, I watch,
etc.)

10. ADVANTAGES
•Faster response time than LEDs
•Consume significant less energy
•Can be transparent when off
•Flexible and Conformal Displays
•Thinner display-No backlight
required
•Better contrast ratio
•Wider viewing angles: up to 170
degrees
•OLED refresh almost 100 times faster
then LED
•Low expensive than LED due to
lesser components

11. FAST RESPONSE TIME
Fast response time means full motion
graphics can be displayed

12. DISADVANTAGES
•Lifetime- Red and Green OLED films
have longer lifetimes ( 46,000 to 230,000
Hours) while blue OLED have much
shorter lifetimes(around 14,000 hours)
•Manufacturing – Currently,
manufacturing is more expensive then
LEDs
•Water- Water can easily damage OLEDs
•OLED screens are even worse than LED in
direct sunlight
•Limited market availability

13. DIRECT SUNLIGHT

14. FUTURE USES FOR OLED
•Manufacturing focusing on
finding a cheap way to produce.
•Roll-to-Roll manufacturing.
•Increasing efficiency of blue
luminance.
•Boosting overall lifespan.

15. FUTURE USES FOR OLED
•Data glass
•GPS system
•OLED- in future cars
•Curved OLED displays, placed on flat displays
•Scroll Laptop

16. CONCLUSION
•Organic Light Emitting Diodes are evolving as the next
generation displays.
•OLED will replace LED and LCD technologies
•Flexibility and thinness will enable many application.