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Organic Light Emitting Diodes Organic Light Emitting Diodes

Organic Light Emitting Diodes - PowerPoint Presentation

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Organic Light Emitting Diodes - PPT Presentation

Andrew Sanders Fawzi Salama John P Handrigan 12022010 Outline Introduction How OLEDs work Materials Fabrication Techniques Recent Developments Conclusions 2 Introduction 3 ID: 476082

fabrication http techniques organic http fabrication organic techniques materials oleds www science small layer high deposition phase jpg vacuum

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Slide1

Organic Light Emitting Diodes

Andrew Sanders, Fawzi Salama, John P. Handrigan

12/02/2010Slide2

Outline

IntroductionHow OLEDs work?MaterialsFabrication TechniquesRecent DevelopmentsConclusions

2Slide3

Introduction

3Slide4

Applications

http://en.wikipedia.org/wiki/File:OLED_EarlyProduct.JPG

http://www.newlaunches.com/entry_images/1107/14/sony_xel2-thumb-450x337.jpg

http://www.hitech-projects.com/euprojects/olla/downloads/pictures/olla_4generations.jpg

4Slide5

Advantages

Low power consumptionFlexible displays (with polymer layer)High Contrast (1,000,000:1)Thin Displays (3mm)Thin organic Layer (100 -150 nm)

5Slide6

History

Commercialization of inorganic LEDs in 1960’sOLEDs using small moleculesTang and Van Sylke from Kodak (1987)Discovery of electroluminescence from polymers J. H. Burroughes et al. (1990) at University of Cambridge

6Slide7

How OLEDs WorkOrganic

SemiconductivitySMALL MOLECULE TYPE

POLYMER TYPE

Aluminum oxinate

Polyphenylene vinylene

http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=24868131

http://upload.wikimedia.org/wikipedia/commons/9/94/Polyphenylene_vinylene.png

7Slide8

How OLEDs WorkStructure

Electrons (-)

Electron-holes (+)

http://www.sigmaaldrich.com/materials-science/material-science-products.html?TablePage=19353440

8Slide9

HOMO

(valence band)

Electron Holes (+)

Electrons (-)

Emissive Layer

Δ

E=h/ (

λ

c)

LUMO

(Conduction band)

9

How OLEDs Work

ElectroluminescenceSlide10

Configuration

SubstrateGlass, PETAnodeITO, PolyanilineCathodeCa, Mg-Ag, Al-LiHTLETL

10

http://www.sigmaaldrich.com/materials-science/material-science-products.html?TablePage=19353440

Anode

Substrate

HTL

Cathode

EML

ETLSlide11

EML Materials

11PropertiesSemi-conductorRadiative recombination dominates due to large energy level3 basic colors

2 typesSmall MoleculesPolymersSlide12

Photo Emitting Materials

Small MoleculesGreen: Alq3Blue: DistyrylarylenesRed: RubrenePolymersGreen: PPV

Blue: PPP’s, PFO’sRed: PT’s, P3ATs12

Rubrene

Alq3

Distyrylarylene

PPV

PPP

PTSlide13

Fabrication Techniques

13Wet TechniquesInkjet PrintingDry TechniqueVacuum Thermal Evaporation

Organic Vapour Phase DepositionSlide14

Fabrication Techniques:

Inkjet Printing14Advantages

Solution for large area depositionDisadvantagesDeposited film is non-uniformSlide15

Fabrication Techniques:

Vacuum Thermal Evaporation15Advantages

High film uniformityVacuum equipment is availableDisadvantagesOrganic build up on chamber wallsExpensiveSlide16

Fabrication Techniques:

Organic Vapour Phase Deposition16Slide17

Fabrication Techniques:

Organic Vapour Phase Deposition17Advantages

High uniformityReduced organic material consumptionDoes not require high-vacuum conditionsDisadvantagesExpensive equipmentSlide18

Market

18Slide19

Current Research

Phosphorescent materialsDevice lifetimeApplication to solar cells19Slide20

Conclusions

Young technologyEnormous progress on materials and fabrication techniquesGrowing technology for electronics displayWith lower costs, the best technology to adopt20Slide21

Questions?Thank you