Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8029402 | Surface and Coatings Technology | 2013 | 6 Pages |
Abstract
The characteristics and reflection properties of a Sn-3.5Â wt.%Ag (hereafter, Sn-3.5Ag) thin film on a light emitting diode (LED) lead frame were investigated in this study. The advantages of a Sn-3.5Ag layer, namely its good solderability and low cost compared to Ag, are attractive for LED applications. A Sn-3.5Ag layer was deposited in an electroless process on an electro-plated copper substrate with bath immersion times of 2 to 10Â min. At an immersion time of 4Â min, the optical density and reflectivity of the Sn-3.5Ag deposits was 1.91Â D and approximately 98%, respectively. The reflectivity of the Sn-3.5Ag deposition layer decreased with increasing surface roughness and with larger grain size. The reflectivity of a sample aged for 100Â days decreased approximately 3.6% compared to the as-plated Sn-3.5Ag sample.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Se Ho Kee, Won Joong Kim, Jae Pil Jung,