oled fabrication

8/22/2019 OLED Fabrication

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OLEDs are light emitting devicesthat have a thin film of organiccompounds as its emissiveelectroluminescent layer.


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Physical Vapor Deposition

Screen Printing

Ink Jet Printing In-line Fabrication


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Thermal vapor evaporation of smallmolecules occurs in environment of 10e(-

6) Torr or higher It is usually carried out on glass substrate

Multicolor displays are made using

properly matched shadow masks fordepositing RGB emitting materials


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Thickness can be easily controlled

2-dimensional combinatorial arrays of

OLEDs can be easily fabricated in asingle deposition procedure

PVD uses the generally available

vacuum equipment that exists in thesemiconductor industry


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Expensive

Not flexible

Has no control to direct the materials todeposit on the desired areas

Inefficient use of materials


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Used in low information content displayssuch as logos and signs

Thin films achieved Elements of screen printing: screen,

stencil, squeegee, ink, press bed, and

substrate Mesh materials can vary from polyester

to stainless steel


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1. The mesh material is stretched across a

frame

2. Hole transport layer prepared using asolution of diamine, polycarbonate, and

rubrene.

3. Squeegee is used to wipe solution through

the open mesh4. Resulting film covers entire surface of ITO

5. Electron transport layer (ETL) and cathode

are deposited by PVD


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For patterned hole transport layer (HTL)

devices: cathode is deposited in a block larger

than the HTL pattern For non-patterned HTL: cathode is depositedthrough a mask to create emitting regions of

known area for device output measurement


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Simple

Lower cost

Great reduction in materials usagebecause materials are only directed tothe printed areas

Faster than inkjet printing More versatile


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OLEDs are sprayed onto substrates likeink sprayed on paper during printing

Advantages:- Reduced cost

- Allows OLEDs to be printed on very largefilms


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Ink jet printing to define and pattern RGB emitting subpixels


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Mass production

technique

Vertical in-line tool

operates withcontinuous substrate

flow

Linear sources of

depositing organicand metallic

materials


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Cheaper mass production technique

Excellent thickness homogeneity

Excellent deposition stability Complicated stack structures possible

High deposition rates/high throughput

High material usage Large substrate handling


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Ghassan E. Jabbour et al., Screen Printing for the Fabrication of OrganicLight-Emitting Devices, IEEE 7:5, 2001

Joseph Shinar, Organic Light-emitting Devices.

http://www.ewh.ieee.org/soc/cpmt/presentations/cpmt0401a.pdf

http://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdf

Muhamad Mat Salleh, et.al., Fabrication of Organic Light EmittingDiodes.

http://optics.org/cws/article/research/24299
http://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdfhttp://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdfhttp://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdfhttp://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdfhttp://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdfhttp://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdfhttp://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdfhttp://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdfhttp://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdfhttp://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdfhttp://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdfhttp://www.opera2015.org/deliverables/MONA_CD-ROM/4_Symposium%20Presentations/04-scholles2752.pdf

oled fabrication

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