What is fluorescence, Phosphorescence & Persistence in terms of CRT?

Following are the definitions of properties of CRT screen –

1. Fluorescence: It is defined as the property of phosphor coating, to emit light when electron beam strikes on it. It is an instantaneous phenomenon i.e. the light is emitted till e-beam strikes.
2. Phosphorescence: It is the property of a particular phosphor coating, to continue light emission even after the electron beam stops striking on it.
3. Persistence: It is defined as the length of time in which the phosphorescence phenomenon occurs. It is different for different phosphor compounds. Maximum time length is 2-3 seconds.
4. Luminescence: It is defined as the intensity of light emitted from the CRT screen.