Organic Light Emitting Diodes Material Science Stephen Clemmet CEng MSc BEng MIET Oxford - Great Britain.

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Presentation transcript:

Organic Light Emitting Diodes Material Science Stephen Clemmet CEng MSc BEng MIET Oxford - Great Britain

Topics Organic Light Emitting Diode Devices 1.Overview of OLED technology 2.Fluid material science 3.Lifetime and degradation Ultraviolet Curing 1.UV-inkjet curing technology 2.Material science 3.Curing techniques 4.Curing challenges

Technology Overview

Organic Light Emitting Diodes

OLED System

Organic Electronics Literature Organic Electronics Hagen Klauk Wiley- VCH ISBN £126 / €146

Organic Electronics Literature Organic Light-Emitting Devices Joseph Shinar Springer ISBN £87 / €100

Material Science

Lifetime Oxygen Pin holes Temperature Water vapour

OLED Structure Encapsulation Power Mask Hole Transport Emissive Electron Transport Cathode Substrate Anode Light

Substrates Substrate MaterialMalleability Thickness µm WVTR ml/m 2 /24hr O 2 TR cm 3 /m 2 /24hr GlassRigid PETFlexible PET = Polyethylene terephthalate WVTR= Water vapour transmission rate O 2 TR= Oxygen transmission rate

Anode Materials Anode ParameterITO on glassITO on PETPANIPW MalleabilityRigidFlexible Resistivity Ω/m 2 10 / 45 / 8560 / 200 / 3004<0.1 ITO= Indium tin oxide PANI= Polyaniline PW= Printed wire

Printed Wire Track width = 0.05m Track pitch = 0.5mm Resistivity ≤ 0.1 Ω/m 2

Mask Materials Mask DepositionColoursCuringPerformance UV-inkjetCYMK / BWSecondsExcellent Screen-printCYMK / BWminutesExcellent UV= Ultraviolet

Hole Transport Layer Hole Transport MaterialDepositionColour Resistivity Ω/m 2 PEDOT:PSSSpin-coatDark blue500 PEDOT:PSSInkjetDark blue PEDOT:PSS = Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)

Emissive Layer Emissive MaterialDepositionSolventColourPerformance Ruthenium complexSpin-coatAcetonitrileRedGood Ruthenium complexInkjetDMFRedGood DMF = N,N-Dimethylformamide

Polymertronics’ Red Diamond 620s Deposition

Inkjet on ITO

Red Diamond Emission Spectra

Electron Transport Materials Electron Transport MaterialSolventColourPerformance Alq 3 ChloroformGreenGood PBDTolueneClearFair Butyl-PBDTolueneClearFair Alq 3 = Tris-(8-hydroxyquinoline)aluminum PBD= 2-(4-Biphenylyl)-5-phenyl-1,3,4-oxadiazole Butyl-PBD= 2-(4-tert-Butylphenyl)-5-(4-biphenylyl)-1,3,4-oxadiazol

MaterialDeposition Work Function eV Resistivity Ωm Temp ºC Performance AluminiumSputter x Excellent Indium-GalliumLiquid x Good (Lab) Indium FoilHeat x Fair Silver ParticlesLiquid x Fair GoldSputter x Useless Cathode Materials Cathode

Indium-Gallium

Encapsulation Materials MaterialMalleability Thickness µm WVTR ml/m 2 /24hr GlassRigid1100- PETFlexible PENFlexible CAFlexible11077 PET = Polyethylene terephthalate PEN= Polyethylene nitride CA= Cellulose Acetate Encapsulation

UV-Inkjet

UV-Inkjet

Advantages of UV-Inkjet Fast printing 4s curing time High durability High dot-registration Inkjet on non-pourous surfaces Print electronics with CYMK graphics

UV Bands BAND Wavelength nm CuringSource UVA CYMKHgPb UVB UVC GMAHgFe VUV HgPb= Mercury - Lead HgFe= Mercury – Iron CYMK= Cyan, yellow, magenta, black colour inks GMA = Poly(tert-butyl methacrylate-co-glycidyl methacrylate) 400nm 700nm

Mercury-Lead Spectra

Mercury-Iron Spectra

Red Diamond 620 Emissive Layer Emissive MaterialDepositionSolvent Wavelength nm PolymerInitiator Ruthenium complexInkjetDMF260GMAPDT DMF= N,N-Dimethylformamide GMA = Poly(tert-butyl methacrylate-co-glycidyl methacrylate) PDT = (4-Phenoxyphenyl)diphenylsulfonium triflate

Electron Scans

Organic Light Emitting Diodes Material Science Stephen Clemmet CEng MSc BEng MIET Oxford - Great Britain

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