7A70.XX Quantum Dots
Concepts
Particle in a box, semiconductor band theory
Overview
Quantum dots of various sizes will fluoresce in different colours when excited by a purple laser pointer. They do not fluoresce when a red laser shines through them.
| Colour | Peak wavelength (nm) | Radius (nm) |
|---|---|---|
| Green | 540 | 2.367454 |
| Yellow | 570 | 2.533894 |
| Orange | 600 | 2.718174 |
| Red | 630 | 2.924941 |
Details
Equipment
- [1] Quantum dot array
- [1] Purple laser pointer
- [1] Red laser pointer
Important Notes
- Lasers can cause blindness. Use with caution.
Script
- Turn off the room lights.
- Using the purple laser pointer, illuminate the quantum dot array from below one cell at a time. The cells should fluoresce in different colours.
- Using the red laser pointer, illuminate the array one cell at a time. The cells should not fluoresce.
Additional Resources
References
- PIRA 7A70.XX
Disclaimer
- Don't attempt this at home!
- 大象传媒 is not affiliated with any external sites linked here and is not responsible for their content.
Last revised
- 2025
Technicals
- Original construction: purchased. It is not clear where we bought this, but the University of Michigan has a very similar-looking demo in their .
Related AV
Related demos
If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.