Optimization of InGaN-based LED Package Structure for Automotive Adaptive Driving Beam Headlamp
- Authors
- Kim, Ho-Young; Kim, Min-Su; Lee, Kwang-Hee; Kang, Kyoung-Mo; Oh, Jeong-Tak; Jeong, Hwan-Hee; Seong, Tae-Yeon
- Issue Date
- 6-1월-2020
- Publisher
- ELECTROCHEMICAL SOC INC
- Keywords
- Light-emitting diode; Solid State Lighting; Packaging; luminance; Thermo-mechanical stress; Thermal resistance
- Citation
- ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY, v.9, no.5
- Indexed
- SCIE
SCOPUS
- Journal Title
- ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
- Volume
- 9
- Number
- 5
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/58344
- DOI
- 10.1149/2162-8777/ab9dc6
- ISSN
- 2162-8769
- Abstract
- We investigated the luminance, thermal, and thermo-mechanical properties of vertical (V)-LED and flip-chip (FC)-LED packages with different white silicones for a vehicle head lamp application. The FC-LED package showed higher equivalent maximum stress than the V-LED package. For example, the equivalent maximum stresses for the FC-LED package with white silicone (WR-3020) were 6.05 and 2.45 MPa at -45 and 125 degrees C, respectively, whereas those for the V-LED one with WR-3001 were 1.09 and 1.56 MPa. Irrespective of currents, the V-LED packages exhibited lower thermal resistance (R-th) than the FC-LED package. The V-LED package showed 25.3% lower R(th)value (junction to PCB) at 1000 mA than the FC-LED package. The FC-LED packages illustrated higher luminous flux drop-rate at 85 degrees C than the V-LED package. The V-LED packages revealed lower surface temperature than the FC-LED package. The contrast ratio depended on the package structures and white silicone coating widths. The packages with the wider edge-coating width had higher luminance and the V-LED packages exhibited higher luminance. The luminous flux maintenance rate was degraded by 0.9%-2.9% after 1000 h. The V-LED package with WR-3001 showed the best performance, while the FC-LED package with WR-3020 displayed the lowest performance.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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