Organic Light Emitting Diodes Material Science Stephen Clemmet CEng MSc BEng MIET Oxford - Great...
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Transcript of Organic Light Emitting Diodes Material Science Stephen Clemmet CEng MSc BEng MIET Oxford - Great...
![Page 1: Organic Light Emitting Diodes Material Science Stephen Clemmet CEng MSc BEng MIET Oxford - Great Britain.](https://reader036.fdocuments.in/reader036/viewer/2022081506/56649e265503460f94b15a44/html5/thumbnails/1.jpg)
Organic Light Emitting DiodesMaterial Science
Stephen Clemmet CEng MSc BEng MIET
Oxford - Great Britain
![Page 2: Organic Light Emitting Diodes Material Science Stephen Clemmet CEng MSc BEng MIET Oxford - Great Britain.](https://reader036.fdocuments.in/reader036/viewer/2022081506/56649e265503460f94b15a44/html5/thumbnails/2.jpg)
Topics
Organic Light Emitting Diode Devices
1. Overview of OLED technology2. Fluid material science3. Lifetime and degradation
Ultraviolet Curing
4. UV-inkjet curing technology5. Material science6. Curing techniques7. Curing challenges
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Technology Overview
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Organic Light Emitting Diodes
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OLED System
OLED Driver
Channels
PWM
Current
Battery
Device
EncapsulationUV
Cathode
ETL
EmissiveUV
HTL
MaskUV
Anode
Substrate
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Organic Electronics Literature
Organic Electronics
Hagen Klauk
Wiley- VCHISBN 978-3-527-31264-1£126 / €146
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Organic Electronics Literature
Organic Light-Emitting Devices
Joseph Shinar
SpringerISBN 0-387-95343-4£87 / €100
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Material Science
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Lifetime
Oxygen Pin holesTemperature Water vapour
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OLED Structure
Encapsulation
Power
Mask Mask
Hole Transport
Emissive
Electron Transport
Cathode
Substrate
Anode
Light
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Substrates
Substrate
Material Malleability Thicknessµm
WVTRml/m2/24hr
O2TRcm3/m2/24hr
Glass Rigid 1110 - -
PET Flexible 160 1.6 1.5
PET = Polyethylene terephthalateWVTR = Water vapour transmission rateO2TR = Oxygen transmission rate
www.norner.no/bcalc/model/wvtr/film
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Anode Materials
Anode
Parameter ITO on glass ITO on PET PANI PW
Malleability Rigid Flexible Flexible Flexible
Resistivity Ω/m2 10 / 45 / 85 60 / 200 / 300 4 <0.1
ITO = Indium tin oxidePANI = PolyanilinePW = Printed wire
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Printed Wire
Track width = 0.05mTrack pitch = 0.5mmResistivity ≤ 0.1 Ω/m2
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Mask Materials
Mask
Deposition Colours Curing Performance
UV-inkjet CYMK / BW Seconds Excellent
Screen-print CYMK / BW minutes Excellent
UV = Ultraviolet
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Hole Transport Layer
Hole Transport
Material Deposition Colour ResistivityΩ/m2
PEDOT:PSS Spin-coat Dark blue 500
PEDOT:PSS Inkjet Dark blue 75-120
PEDOT:PSS = Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)
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Emissive Layer
Emissive
Material Deposition Solvent Colour Performance
Ruthenium complex Spin-coat Acetonitrile Red Good
Ruthenium complex Inkjet DMF Red Good
DMF = N,N-Dimethylformamide
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Polymertronics’ Red Diamond 620s Deposition
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Inkjet on ITO
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Red Diamond Emission Spectra
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Electron Transport Materials
Electron Transport
Material Solvent Colour Performance
Alq3 Chloroform Green Good
PBD Toluene Clear Fair
Butyl-PBD Toluene Clear Fair
Alq3 = Tris-(8-hydroxyquinoline)aluminumPBD = 2-(4-Biphenylyl)-5-phenyl-1,3,4-oxadiazoleButyl-PBD = 2-(4-tert-Butylphenyl)-5-(4-biphenylyl)-1,3,4-oxadiazol
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Material DepositionWork
FunctioneV
ResistivityΩm
TempºC Performance
Aluminium Sputter 4.08 2.7 x10-8 500 Excellent
Indium-Gallium Liquid 4.15 29.4 x10-8 16 Good (Lab)
Indium Foil Heat 4.12 8.4 x10-8 157 Fair
Silver Particles Liquid 4.26 1.2 x10-8 25 Fair
Gold Sputter 5.10 2.4 x10-8 500 Useless
Cathode Materials
Cathode
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Indium-Gallium
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Encapsulation Materials
Material Malleability Thicknessµm
WVTRml/m2/24hr
Glass Rigid 1100 -
PET Flexible 160 1.6
PEN Flexible 160 0.5
CA Flexible 110 77
PET = Polyethylene terephthalatePEN = Polyethylene nitrideCA = Cellulose Acetate
Encapsulation
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UV-Inkjet
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UV-Inkjet
www.cyan-tec.com
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Advantages of UV-Inkjet
Fast printing4s curing timeHigh durability
High dot-registrationInkjet on non-pourous surfaces
Print electronics with CYMK graphics
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UV Bands
BAND Wavelength nm Curing Source
UVA 380-315 CYMK HgPb
UVB 315-280 - -
UVC 280-200 GMA HgFe
VUV 200-100 - -
HgPb = Mercury - LeadHgFe = Mercury – IronCYMK = Cyan, yellow, magenta, black colour inksGMA = Poly(tert-butyl methacrylate-co-glycidyl methacrylate)
400nm 700nm
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Mercury-Lead Spectra
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Mercury-Iron Spectra
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Red Diamond 620 Emissive Layer
Emissive
Material Deposition Solvent Wavelengthnm Polymer Initiator
Ruthenium complex Inkjet DMF 260 GMA PDT
DMF = N,N-DimethylformamideGMA = Poly(tert-butyl methacrylate-co-glycidyl methacrylate)PDT = (4-Phenoxyphenyl)diphenylsulfonium triflate
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Electron Scans
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Organic Light Emitting DiodesMaterial Science
Stephen Clemmet CEng MSc BEng MIET
Oxford - Great Britain