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The study of Thermal Resistant Enhancement of Siloxane-Modified LED Transparent Encapsulants

Published online by Cambridge University Press:  17 March 2011

Kai-Chi Chen ,
Chia-Wen Hsu  and
Hsun-Tien Li
Kai-Chi Chen
Affiliation:
Industrial Technology Research Institute, Rm. 806, Bldg. 44, 195, Sec. 4, Chung Hsing Rd. Chutung, Hsinchu, 310, Taiwan
Chia-Wen Hsu
Affiliation:
Industrial Technology Research Institute, Rm. 806, Bldg. 44, 195, Sec. 4, Chung Hsing Rd. Chutung, Hsinchu, 310, Taiwan
Hsun-Tien Li
Affiliation:
Industrial Technology Research Institute, Rm. 806, Bldg. 44, 195, Sec. 4, Chung Hsing Rd. Chutung, Hsinchu, 310, Taiwan
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Abstract

Thermal resistant property of siloxane-modified epoxy compositions designed for long-term and high temperature storage was investigated. In this study, we developed two siloxane-modified epoxy compositions to improve the thermal stability of current epoxy encapsulants. One composition contained silicone epoxy, and the other one was cyclic aliphatic siloxane dianhydride.

We selected triglycidyl ether terminated Phenylmethylsiloxnae-co-dimethylsiloxne (GT-1000), which was compatible with the diglycidyl ether of bisphenol A epoxy (Epon-828), to partial replaced the epoxy resin and was cured by liquid anhydride (MHHPA). In the mean time, we also synthesized 5, 5'-(1, 1, 3, 3-tetramethyl disiloxane-1, 3-dilyl)-bis-norborane-2, 3-dicarboxylic anhydride (A1) as a co-curing agent to cure Epon-828.

The thermal resistance was studied by measuring the increase of yellow index (ΔYI) after thermal treatments. In 110 °C storage experiment for 1000 h, the ΔYI of GT-1000 0.2 equivalent was 1.51, whereas Epon-828/MHHPA (Comp 1) was 6.74. Moreover, The ΔYI of the composition with higher equivalent GT-1000 was only 2.15 after 2000 hours thermal aging. In the cyclic aliphatic siloxane dianhydride co-curing compositions, when A1 was 0.05 and 0.1 equivalent, the ΔYI was 2.28 and 0.72 after 1000 h, respectively. Compared with Comp 1, both GT-1000 and A1 were effective for thermal resistance.

In IR-reflow test, the ΔYI of GT-1000/Epon-828/MHHPA= 0.5/0.5/1 was 0.65 and that of Epon-828/MHHPA was 1.49 after 260 °C for 10 seconds. The results revealed that either the siloxane-modified epoxy or siloxane-modified curing agent had excellent thermal resistant property for high performance LED applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1007: Symposium S – Organic/Inorganic Hybrid Materials-2007 , 2007 , 1007-S01-03
Copyright
Copyright © Materials Research Society 2007

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References

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