electroluminescent light sources - fh-muenster.de · 2019. 9. 6. · history electroluminescent...

Electroluminescent light sourcesElectroluminescent light sources

MICHAEL POMBERGTIM AVERBECK

HistoryElectroluminescent light sourcesy

Fundamental

sources

Terms

Working • 1936 Electroluminescence discovered by G.DestriauWorking Principle • 1950 First scientific research (ITO)

Production • early 1960`s Scientific focus on TF-EL

• 1967 Enhanced efficiency due to 2 insulating layersMaterials

Applications

• 1980`s Application in monochromatic displays

• Today Research on EL TV technologyApplications • Today Research on EL TV technology


Fundamental

sources

TunnelingTerms

WorkingPhenomenon illustrated by the particle in the box“ modelWorking

Principle„particle-in-the-box model

•Particle in the box does not obay Heisenberg‘s Uncertainty

Productionobay Heisenberg s Uncertainty principle

•Simultaneously determined:Materials

Applications

Simultaneously determined: position and velocity

•Particle can „leave“ the box Applications „


Fundamental

sources

LuminescenceTerms

WorkingWorking Principle

• light emission in non thermal equilibrium

• LED vs. incandescent bulb

Production

Materials

ApplicationsApplications


Fundamental

sources

Working principleTerms


Production

Materials



Fundamental

sources


Working

ACTFEL

Working Principle

Production

Materials



Fundamental

sources



Production

Materials



Fundamental

sources

Atomic layer depositionTerms

Working1) Exposure of the first precursorWorking

Principle

precursor

2) Purge or evacuation of the reaction chamber

Production 3) Exposure of the second precursor

Materials

Applications

4) Purge or evacuation of the reaction chamber

Applications


Fundamental

sources


Working

Reacting chamber

Working Principle

Production

Materials



Fundamental

sources


Working• Adjusted parameters like interaction time or temperature are element

Working Principle

depending

• Time for one cycle round about 0.5 sec

Production • Layer thickness of 0.1 nm - 3.0 nm per cycle

Materials



Fundamental

sources

SputteringTerms

Working• releasing of atoms through

Working Principle

electron bombardement

Production

Materials



Fundamental

sources

Doctor blade coatingTerms

Working• Applying a paste via a template

Working Principle • space resolved applying possible

• just drying after printing processProduction

• just drying after printing process

Materials



Fundamental

sources

MaterialsTerms

Working

Substrate

Working Principle

• good transmission

• high electric resistance

Production • stable against H2O and O2

PMMA PC special silicate glassesMaterials

Applications

PMMA, PC, special silicate glasses

Applications


Fundamental

sources

MaterialsTerms

Working

Electrodes

Working Principle

• good electric conductivity

• good adhesion to the insulator

Production • has to be stable up to 108 V/m

• good transmission (vis)Materials

Applications

• good transmission (vis)

ITO, Aluminium, PolymersApplications


Fundamental

sources

MaterialsTerms

Working

ITO

Working Principle

• very good electrical conductivity, very transparent

• consists of 90% In2O3 and 10% SnO2

Production

Materials



Fundamental

sources

MaterialsTerms

Working

Insulating layers

Working Principle

• wide band gap

• high penetration voltage

Production • free of defects

• high dielectric constantMaterials

Applications

• high dielectric constant

Al2O3, AlOxNy, BaTiO3, SrTiO3Applications


Fundamental

sources

MaterialsTerms

Working

Phosphors

Working Principle

• high lumenesent density

• high quantum efficiency

Production • good colour saturation

• good chemical stabilityMaterials

Applications

• good chemical stability

ZnS:Mn, ZnS:Tb, CaS:Eu, CaS:Ce, SrS:CeApplications

Hi t

Electroluminescent light sourcesHistory

Fundamental

sources

ApplicationsFundamental Terms

• Displays (OLEDs, LED LCD)

Working Principle

• Backlighting

D ti l t

Production• Decorative elements

Materials

Applications

Hi t

Electroluminescent light sourcesHistory

Fundamental

sources

ReferencesFundamental Terms •A.H. Kitai: Solid State Luminescence

•Electroluminescence handout provided by Prof Dr KynastWorking Principle

•Electroluminescence handout provided by Prof. Dr. Kynast

•Peter W. Atkins: Physikalische Chemie

Production•Engel; Reid: Physikalische Chemie

•Presentation from ORMECON EL: Nanotechnology for

MaterialsPresentation from ORMECON EL: Nanotechnology for

Advanced Applications

•www.wikipedia.comApplications

p

•www.electroluminecence-inc.com

electroluminescent light sources - fh-muenster.de · 2019. 9. 6. · history electroluminescent...

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