ppt of light emitting polymer or organic light emitting diode

1. Seminar
On
Light Emitting
Polymers
By : MOHD REHAN
Roll No : 1604-13-735-313

3. CONTENT
 TYPES OF LED
 INTRODUCTION
 HISTORY
 ARCHITECTURE
 WORKING
 MANUFACTURING
 TYPES OF LEPS
 PERFORMANCE COMPARISON
 ADVANTAGE
 DISADVANTAGES
 APPLICATION
 FUTURE SCOPE
 CONCLUSION
 REFERENCES

4. Light emitting diodes..

5. INTRODUCTION
 LEP or PLED or P OLED
 Polymer which emits light(EM radiations).
 Polymers are chains of smaller molecular components
called MONOMERS.
 CDT & UDC are developing LEP display.

6. HISTORY
 1977 conducting polymers are discovered.
 Alan J. Heeger , Alan G. MacDiarmid got Nobel prize
 From this OLED evolved
 Birth of “LIGHT EMITTING POLYMERS”!!!!!!!!!!!
 Poly phinylene vinylene (PPV) is the first LEP
discovered.

7. ARCHITECTURE
 Thin film of semiconducting polymer sandwiched between an
ANODE and CATHODE. Metal Cathode Polymer
 ANODE: ITO(Indium Tin Oxide)
 CATHODE: Metals (depends upon the type of LEP) Glass
Substrate
 SUBSTRATE: Glass, clear plastic (depends upon the type of LEP)
Transparent Anode (ITO)
 Voltage is applied between anode and cathode

8.  Voltage is applied between two electrodes
PRAYAG RANJAN SETHI
+
-
HOW IT WORKS?

9. PRAYAG RANJAN SETHI
+
-
• Then both types of charge carriers migrate into the polymer
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–

10. PRAYAG RANJAN SETHI
+
-
+
–
+
–
+
–
+
––
+
–
+
+
–
– +– +
• Positive and negative charge carriers combine together to
form excitons.

11. PRAYAG RANJAN SETHI
+
-
+
–
+
–
+
–
+
––
+
–
+
+
–
– +
• Emit light when excitons reaches to initial state

12. MANUFACTURING
 SPIN COATING PROCESS
 PRINTER BASED TECHNIQUE

13. 1. SPIN COATING METHOD
STEP 1
• Substrate is placed on spinning
plate.
STEP 2
• Plate is spinning at a speed of
few thousand rotation per
minute.
STEP 3
• Robotic arm will pour small
amount of polymer solution to
the substrate.
STEP 4
• After spreading ,it is baked to
evaporate any remaining liquid.
STEP 5
• Extremely fine layer of polymers
having very less thickness

14. 2.PRINTER BASED TECHNIQUE
 LEPs can be patterned using a wide variety of printing
techniques. The most advanced is ink-jet printing.
 Resolution as high as 360 dpi have been demonstrated
and the approach are scalable to large-screen displays.
 Printing promises much lower manufacturing cost.

15. TYPES OF LEPS
 Flexible(FLEP)
 Transparent organic(TOLEP)

16. FLEXIBLE LEP

17. TRANSPARENT ORGANIC LEP

18. PERFORMANCE COMPARISON…
PLED LCD
Fast Response Time Wide Viewing Angle
PLED LCD
Better Contrast
Ratio
PLED LCD

19. ADVANTAGES
 Require only 3.3v & life time of more than 30,000 hr.
 Low power consumption.
 Self luminous.
 No viewing angle dependence.
 Manufacturing cost is less.
 Can be scaled to any dimension.
 No environmental draw backs.
 Simple to use.
 Very slim flat panel displays.

20. DISADVANTAGES
 Voltage drops may affect the performance.
 Limited market availability.
 Aging of LEP
 Degradation of luminescence
 Light intensity gradually decreases.
 Disintegrate due to contact with oxygen.

21. APPLICATIONS
 Multi or full color cell phone displays
 Full color high-resolution personal digital
assistants(PDAs)
 Light weight wrist watches
 Roll-up daily refreshable electronic newspapers
 Automobile light systems without bulbs

22. FUTURE SCOPES….
 LEP in future cars

23. LAPTOPS……

24. TELEVISIONS…

25. CONCLUSION
 It has both electrical and optical property.
 It is simpler & cheaper.
 It permits flexible lighting and display .
 It is technology for the future.

26. REFERENCES
 www.google.com
 www.wikipedia.com
 www.studymafia.org