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LEDs: Lighting the FuturePresenter:
Ted Kretschmer, Mechanical EngineeringMentors:
Dr. Xuejun Fan, Mechanical EngineeringDr. Liangbiao Chen, Mechanical Engineering
OUTLINE
• Importance of LEDs• LED Basics• Technical Challenges• Proposed Research• Summary
Why LEDs?
*Energy Savings Forecast of SSL in General Illumination Applications (DOE) : August 2014
ADVANTAGES OF LEDs
• Efficiency• Longevity• Color• Color Temperature• Inherently Safe
• Incandescent• 15 lm/W
• Halogens• 20 lm/W
• CFLs• 73 lm/W
• LEDs• 94 lm/W
•2030 LED Projections• 220 lm/W *2014 DOE SSL Multi-Year Program (DOE): April 2013
0
50
100
150
200
250
Incandesent
Halogens
CFLs
LEDs
LED Projections
15
20
73
94
220lm/W
LED Efficacy Vs Traditional Lighting
PRINCIPALS OF LEDS
PRINCIPLES OF LEDs
Current
LED HISTORY
1970 1975 1980 1985 1990 1995 2000 2005 20100.001
0.01
0.1
1
10
100
Year
Lumens
Information attained from the DOE Website
MAKING WHITE LIGHT– Phosphorous Conversion– Color Mixing• Red Green Blue
– Hybrid Method
*LED Basics (DOE)
COMPONENTS
TECHNICAL CHALLENGES Thermal Management
TECHNICAL CHALLENGES
• Thermal effects are unique to LEDs• Components have individual reliability
statistics• True system reliability is unknown• Hammer Testing Method
WHAT I PLAN TO DO
• Previous years work• Optimization of white LED with variable currents and
temperatures• One dimensional heat transfer analysis
• Moving Forward• Advanced thermal analysis of LED components• Design of heat sinks that better dissipate heat
• Reliability Study• Individual Components
THERMAL ANALYSIS
• Study of available LED lamps
• Design of optimal heat sink
• FEA Model
RELIABILITY STUDY
• Research component level failure mechanisms
• Correlation study between thermal management and component failure
SUMMARY• LEDs are Efficient• Many Advantages• Technical Challenges• Proposed Research
• Thermal Analysis• Reliability Study
Questions
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