electroluminescent light sources - fh-muenster.de · 2019. 9. 6. · history electroluminescent...
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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
HistoryElectroluminescent light sourcesy
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 „
HistoryElectroluminescent light sourcesy
Fundamental
sources
LuminescenceTerms
WorkingWorking Principle
• light emission in non thermal equilibrium
• LED vs. incandescent bulb
Production
Materials
ApplicationsApplications
HistoryElectroluminescent light sourcesy
Fundamental
sources
Working principleTerms
WorkingWorking Principle
Production
Materials
ApplicationsApplications
HistoryElectroluminescent light sourcesy
Fundamental
sources
Working principleTerms
Working
ACTFEL
Working Principle
Production
Materials
ApplicationsApplications
HistoryElectroluminescent light sourcesy
Fundamental
sources
Working principleTerms
WorkingWorking Principle
Production
Materials
ApplicationsApplications
HistoryElectroluminescent light sourcesy
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
HistoryElectroluminescent light sourcesy
Fundamental
sources
Atomic layer depositionTerms
Working
Reacting chamber
Working Principle
Production
Materials
ApplicationsApplications
HistoryElectroluminescent light sourcesy
Fundamental
sources
Atomic layer depositionTerms
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
ApplicationsApplications
HistoryElectroluminescent light sourcesy
Fundamental
sources
SputteringTerms
Working• releasing of atoms through
Working Principle
electron bombardement
Production
Materials
ApplicationsApplications
HistoryElectroluminescent light sourcesy
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
ApplicationsApplications
HistoryElectroluminescent light sourcesy
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
HistoryElectroluminescent light sourcesy
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
HistoryElectroluminescent light sourcesy
Fundamental
sources
MaterialsTerms
Working
ITO
Working Principle
• very good electrical conductivity, very transparent
• consists of 90% In2O3 and 10% SnO2
Production
Materials
ApplicationsApplications
HistoryElectroluminescent light sourcesy
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
HistoryElectroluminescent light sourcesy
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