Glow Sticks
Wh
Mia Foust
Mr. Dunlap
Honor Chemistry, Per 7
December 21, 2010 Glow Sticks Since glow sticks have been invented, consumers have wondered how scientists are able to create these magical sticks of light. They work without producing heat. They don’t need a battery or a bulb, Magic? This “cool” light is called luminescence. Unlike incandescence, which is light from heat energy, luminescence can be emitted at normal or lower temperatures. There are several types of luminescence, bioluminescence, is what happens in fireflies: as the “bio” prefix indicates, it’s caused by a chemical reaction in living things, cathodoluminescence, is caused by electron beams. And Chemiluminescence. Chemilumiescence is the magic behind the glow stick. Chemiluminescence is what happens in glow sticks. The energy that is needed is supplied by chemical reactions. The chemical reaction of chemiluminescence releases energy that is absorbed by electrons in molecules. Electrons in the atoms make a quantum leap once they absorb the energy from the reaction. The electrons must either jump to or fall back from one quantum level to another quantum level this is the quantum leap. (1) The electron jumps to a higher level; at this point the electron is in what is called the excited state, or a higher quantum. As the electron returns to the lower state, it releases the energy as a photon of light; the photon is the light that we see. To make this easier to understand, think of a rock being picked up. When a person picks up a heavy rock, it takes energy, just as it takes energy for an electron to jump to a higher energy level. When the person drops the rock and it falls to the ground, the energy is released as sound energy. And in the case of the electron, the energy that is released is light energy instead of sound energy. Planck’s equation, E = hv was created by Max Planck and Albert Einstein. The equation relates the energy of a Quantum leap “E” to
Mia Foust
Mr. Dunlap
Honor Chemistry, Per 7
December 21, 2010 Glow Sticks Since glow sticks have been invented, consumers have wondered how scientists are able to create these magical sticks of light. They work without producing heat. They don’t need a battery or a bulb, Magic? This “cool” light is called luminescence. Unlike incandescence, which is light from heat energy, luminescence can be emitted at normal or lower temperatures. There are several types of luminescence, bioluminescence, is what happens in fireflies: as the “bio” prefix indicates, it’s caused by a chemical reaction in living things, cathodoluminescence, is caused by electron beams. And Chemiluminescence. Chemilumiescence is the magic behind the glow stick. Chemiluminescence is what happens in glow sticks. The energy that is needed is supplied by chemical reactions. The chemical reaction of chemiluminescence releases energy that is absorbed by electrons in molecules. Electrons in the atoms make a quantum leap once they absorb the energy from the reaction. The electrons must either jump to or fall back from one quantum level to another quantum level this is the quantum leap. (1) The electron jumps to a higher level; at this point the electron is in what is called the excited state, or a higher quantum. As the electron returns to the lower state, it releases the energy as a photon of light; the photon is the light that we see. To make this easier to understand, think of a rock being picked up. When a person picks up a heavy rock, it takes energy, just as it takes energy for an electron to jump to a higher energy level. When the person drops the rock and it falls to the ground, the energy is released as sound energy. And in the case of the electron, the energy that is released is light energy instead of sound energy. Planck’s equation, E = hv was created by Max Planck and Albert Einstein. The equation relates the energy of a Quantum leap “E” to
Cited: Cool Blue Light Experiment Kit. 1996, 16-17 (1) How Chemical Glow sticks work