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Application of liquid desiccant for enhanced lifetime of active matrix organic light emitting diodes

Published online by Cambridge University Press:  02 March 2011

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 emitting diodes (AMOLEDs), we developed a liquid desiccant for encapsulation. The liquid desiccant was prepared by mixing nano-sized calcium oxide (CaO) powders and silicone binder including polyalkylalkenylsiloxane, polyalkylhydrogensiloxane and platinum compound. It was confirmed that liquid desiccant had an effect on absorption of penetrated moisture and oxygen through calcium tests. Also, the test cells encapsulated with only epoxy sealant dispensed at the edge of the cell developed dark spots within 100 hrs, which grew larger with time at 85 oC and 85 % R.H. On the other hand, the test cell sealed with epoxy sealant and liquid desiccant showed no dark spots and retained 97% of its initial luminance even after being stored for 800 hrs at 85 oC and 85 % R.H. Furthermore, the accelerating storage lifetimes of 31-inch bottom-emitting AMOLEDs with epoxy sealant and liquid desiccant showed about 1000 hrs. These results suggest that the liquid desiccant can be applied to encapsulation of large-sized AMOLEDs.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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Application of liquid desiccant for enhanced lifetime of active matrix organic light emitting diodes
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