1. KWL

2. Lit Up

3. Light is a type of Wave The idea of light and other particles is based on their wavelike propagation through space. A wave is defined by the distance between its peaks – Distances range from 1x10 -14 m to 1x10 4 m

4. Use the scale below to estimate the Energy per wavelength.

5. The LED is based on Physics and Chemistry Red light emission (700 nm) requires energy release of 1.77 electron- Volts (eV) Violet light emission (400 nm) requires 3.1 eV http://hyperphysics.phy-astr.gsu.edu/Hbase/electronic/led.html

6. LED Benefits Solid-state device Efficiency No Heat Longevity Future http://www.carolinaleds.com/ledfacts7benefits.html

7. LED Applications, Uses, and Headlines GE OLED (Organic LED) – http://www.ge.com/research/grc_2_9_1.html http://www.ge.com/research/grc_2_9_1.html Cartoon Network’s ATHF marketing campaign – http://www.cnn.com/2007/US/01/31/boston.bo mbscare/index.html http://www.cnn.com/2007/US/01/31/boston.bo mbscare/index.html MIT Disco Dance Floor – http://www.scotttorborg.com/disco-dance- floor/index.html http://www.scotttorborg.com/disco-dance- floor/index.html

8. Wavelength/Energy use in Research Fourier Transform Infrared (FTIR) spectroscopy – Attenuated Total Reflection (ATR)