1. What is meant by luminescence?
2. What is lumen?
3. Define the term fluorescence.
4. Define the term phosphorescence.
5. Explain characteristics luminescent materials.
6. Explain noncharacteristic luminescent materials.
7. Define photoluminescence.
8. What is meant by cathodoluminescence?
9. What is meant by electroluminescence?
10. Define thermoluminescence.
11. What is meant by activators?
12. What is meant by coactivators?
13. Explain how a p-n junction radiates energy.
14. Mention some of the applications of luminescence.