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Application of liquid desiccant for enhanced lifetime of activematrix organic light emitting diodes

Published online by Cambridge University Press:  02 March 2011

Byoung Duk Lee ,
Yoon-Hyung Cho ,
Minho Oh ,
Yong Tak Kim ,
Sang-Hwan Cho ,
So Young Lee ,
Yoon Ah Chung ,
Seung Yong Song ,
Jong Hyuk Lee  and
Sung Chul Kim
Byoung Duk Lee
Affiliation:
OLED Precede Technology Team, Samsung Mobile Display, Gyunggi-Do 446-711, Korea
Yoon-Hyung Cho
Affiliation:
OLED Precede Technology Team, Samsung Mobile Display, Gyunggi-Do 446-711, Korea
Minho Oh
Affiliation:
OLED Precede Technology Team, Samsung Mobile Display, Gyunggi-Do 446-711, Korea
Yong Tak Kim
Affiliation:
OLED Precede Technology Team, Samsung Mobile Display, Gyunggi-Do 446-711, Korea
Sang-Hwan Cho
Affiliation:
OLED Precede Technology Team, Samsung Mobile Display, Gyunggi-Do 446-711, Korea
So Young Lee
Affiliation:
OLED Precede Technology Team, Samsung Mobile Display, Gyunggi-Do 446-711, Korea
Yoon Ah Chung
Affiliation:
OLED Precede Technology Team, Samsung Mobile Display, Gyunggi-Do 446-711, Korea
Seung Yong Song
Affiliation:
OLED Precede Technology Team, Samsung Mobile Display, Gyunggi-Do 446-711, Korea
Jong Hyuk Lee
Affiliation:
OLED Precede Technology Team, Samsung Mobile Display, Gyunggi-Do 446-711, Korea
Sung Chul Kim
Affiliation:
OLED Development Department, Samsung Mobile Display, Gyunggi-Do 446-711, Korea
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Abstract

To enhance the lifetime of large-sized active matrix organic light emittingdiodes (AMOLEDs), we developed a liquid desiccant for encapsulation. Theliquid desiccant was prepared by mixing nano-sized calcium oxide (CaO)powders and silicone binder including polyalkylalkenylsiloxane,polyalkylhydrogensiloxane and platinum compound. It was confirmed thatliquid desiccant had an effect on absorption of penetrated moisture andoxygen through calcium tests. Also, the test cells encapsulated with onlyepoxy sealant dispensed at the edge of the cell developed dark spots within100 hrs, which grew larger with time at 85 oC and 85 % R.H. On the other hand, the test cell sealed with epoxysealant and liquid desiccant showed no dark spots and retained 97% of itsinitial luminance even after being stored for 800 hrs at 85 oC and 85 % R.H. Furthermore, the accelerating storage lifetimes of31-inch bottom-emitting AMOLEDs with epoxy sealant and liquid desiccantshowed about 1000 hrs. These results suggest that the liquid desiccant canbe applied to encapsulation of large-sized AMOLEDs.

Keywords

displaycompoundadsorption

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1286: Symposium E – Molecular and Hybrid Materials for Electronics and Photonics , 2011 , mrsf10-1286-e01-03
Copyright
Copyright © Materials Research Society 2011

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References

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