ZrO 2/epoxy nanocomposite for LED encapsulation

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题名:	ZrO 2/epoxy nanocomposite for LED encapsulation
作者:	蔣孝澈;Chung, Pao Tang;Yang, Chun Ting;Wang, Sho Hsun;Chen, Chien Wei;Chiang, Anthony S.T.;Liu, Cheng-Yi
贡献者:	工學院化學工程與材料工程學系
关键词:	Chemical synthesis;Nanostructures;Optical materials;Optical properties;Polymers;Thermal conductivity
日期:	2012-10-15
上传时间:	2026-04-21 14:01:03 (UTC+8)
出版者:	Elsevier BV;Elsevier B.V
摘要:	摘要： ZrO2/epoxy nanocomposite has been prepared and tested as encapsulant in several types of LED package. The composite was prepared by the blending of cycloaliphatic epoxy/anhydride resin with silane-modified ZrO2 fillers in ethyl acetate solvent, which was removed before curing. The maximum filler loading achieved for a workable encapsulant was about 20% by volume. This led to an increase of 0.04 on the refractive index. A high-power LED package encapsulated with this composite showed more than 10% increase of the light output compared to that with the pure epoxy. The enhancement was more than that predicted by the reduction of internal total reflection at the chip/encapsulant interface. The extra enhancement was traced back to the unusually high scattering and a better heat dissipation. The scattering was found to be wavelength independent, thus more consistent with the Mie theory than the Rayleigh one. The thermal resistance of the composite was measured directly in a LED package and found to be 16% lower than that of a commercial silicone encapsulant. Unfortunately, no improvement on the durability was observed with the addition of inorganic fillers. The temperature-humidity-bias life-time of the packages encapsulated with our composite was practically the same as that with the pure cycloaliphatic epoxy. Therefore, the durability of the composite is largely determined by the matrix itself. ► High refractive index ZrO2/epoxy nanocomposite prepared. ► Tested as the encapsulant in high-power LED packages. ► Showing 10% more luminance intensity than that encapsulated with pure epoxy. ► Better heat dissipation than silicone encapsulant. ► No improvement on temperature humidity bias life-time. 出版者： Elsevier B.V 出版日期： 2012-10-15 出處： Materials chemistry and physics, 2012-10, Vol.136 (2-3), p.868-876 版權： 2012 Elsevier B.V. 識別號： ISSN: 0254-0584 識別號： EISSN: 1879-3312 識別號： DOI: 10.1016/j.matchemphys.2012.08.013
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