1. LEDs: Lighting the Future Presenter: Ted Kretschmer, Mechanical Engineering Mentors: Dr. Xuejun Fan, Mechanical Engineering Dr. Liangbiao Chen, Mechanical Engineering

2. OUTLINE Importance of LEDs LED Basics Technical Challenges Proposed Research Summary

3. Why LEDs? *Energy Savings Forecast of SSL in General Illumination Applications (DOE) : August 2014

4. ADVANTAGES OF LEDs Efficiency Longevity Color Color Temperature Inherently Safe

5. 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 LED Efficacy Vs Traditional Lighting

6. PRINCIPALS OF LEDS

7. PRINCIPLES OF LEDs Current

8. LED HISTORY Information attained from the DOE Website

9. MAKING WHITE LIGHT – Phosphorous Conversion – Color Mixing Red Green Blue – Hybrid Method *LED Basics (DOE)

10. COMPONENTS

11. TECHNICAL CHALLENGES Thermal Management

12. TECHNICAL CHALLENGES Thermal effects are unique to LEDs Components have individual reliability statistics True system reliability is unknown Hammer Testing Method

13. 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

14. THERMAL ANALYSIS Study of available LED lamps Design of optimal heat sink FEA Model

15. RELIABILITY STUDY Research component level failure mechanisms Correlation study between thermal management and component failure

16. SUMMARY LEDs are Efficient Many Advantages Technical Challenges Proposed Research Thermal Analysis Reliability Study