Everyday Light

Optical emission

fluorescence phosphorescence

Light bulb

Light bulb

Neon light

Ne

Ne+

Neon light

Neon light

Fluorescent lights

Fluorescent lightsElectrons flow through gas, ionizing the gas

Charged particles collide with gaseous mercury

Mercury becomes energetically excited

Energy is emitted as UV photons

UV photons excite phosphors on the inside of the tube

phosphors emit fluorescence in the visible range

Fluorescent light

Bedroom stars

Strontium Aluminate

Zinc Sulfide

Remote control

Remote control

LED: 980 nm

Motion sensor

Motion sensor

Laser pointer

Laser pointer

Laser pointer

Laser pointer

Laser pointer

Neodymium:VanadatePotassium Titanium

oxide phosphate

Absorbs: around 800 nm

Fluoresces: @ 1064 nm

‘divides’ wavelength by 2

Laser pointer