130 years ago, Thomas Edison made the first commercial carbon world bulb filament.
And now, from Columbia University, Seoul National University (SNU), and the research team of the Korean Institute of Standards and Science, has used the same elements - perfectly crystalline form of carbon (graphene) - to make the world's thinnest light bulb.
Despite its filament atom then only one layer thick, but still it produces light can easily be seen visually.
By graphene fine wire attached to the metal electrode, and then hung in the way of the silicon substrate, the current through the filament and caused heated to over 2500 ℃ (4500 ℉), which issued a very bright light.
The researchers used graphene to produce the world's thinnest chip-type light source.
Mechanical Engineering Professor James Hone of Columbia University, said:
"We have created the world's thinnest light bulb, this new 'broadband' light source can be integrated into the device, and for the realization of thin flexible transparent displays atoms, as well as communication-based graphene sheet glazing pave the way." .
Interestingly, although graphene temperature so high, but it will not melt a substrate or a metal electrode. This is because, when graphene is heated, its heat less able to spread itself to leave from.
The result is that heat is concentrated and restrictions in the very middle of nowhere filaments, which issued a strong light. Spectral measurements found that the peak broke the people's expectations, which is due to the light-emitting filament and the silicon substrate rebound interference caused.
Unlike any conventional filament, because the material transparent, so this phenomenon is only likely to occur on graphene. By changing the distance between the substrate, the researchers were able to adjust their emission spectra.
Graphene lattice (graphene lattice) can be very efficiently emit light, due to its inherent strength can be maintained excitation level, and allow the free flow of electrons.
That is, as graphene emit electrons quickly rising state (elevated state), it is also effective in the case of photons released electrically heated.
KRISS senior researcher Myung-Ho Bae said:
At the highest temperature, than the electron temperature graphene lattice acoustic vibration modes is much higher. This unique thermal characteristics allow us to graphene suspension is heated to the temperature of the sun half, and with respect to the solid substrate work efficiency 1000-fold.
Currently, researchers are trying to improve the photothermal device so that it can quickly on / off (generates 0 and 1 signals) and used in optical communications. Of course, they will be incorporated into the flexible material exploration methods.
And now, from Columbia University, Seoul National University (SNU), and the research team of the Korean Institute of Standards and Science, has used the same elements - perfectly crystalline form of carbon (graphene) - to make the world's thinnest light bulb.
Despite its filament atom then only one layer thick, but still it produces light can easily be seen visually.
By graphene fine wire attached to the metal electrode, and then hung in the way of the silicon substrate, the current through the filament and caused heated to over 2500 ℃ (4500 ℉), which issued a very bright light.
The researchers used graphene to produce the world's thinnest chip-type light source.
Mechanical Engineering Professor James Hone of Columbia University, said:
"We have created the world's thinnest light bulb, this new 'broadband' light source can be integrated into the device, and for the realization of thin flexible transparent displays atoms, as well as communication-based graphene sheet glazing pave the way." .
Interestingly, although graphene temperature so high, but it will not melt a substrate or a metal electrode. This is because, when graphene is heated, its heat less able to spread itself to leave from.
The result is that heat is concentrated and restrictions in the very middle of nowhere filaments, which issued a strong light. Spectral measurements found that the peak broke the people's expectations, which is due to the light-emitting filament and the silicon substrate rebound interference caused.
Unlike any conventional filament, because the material transparent, so this phenomenon is only likely to occur on graphene. By changing the distance between the substrate, the researchers were able to adjust their emission spectra.
Graphene lattice (graphene lattice) can be very efficiently emit light, due to its inherent strength can be maintained excitation level, and allow the free flow of electrons.
That is, as graphene emit electrons quickly rising state (elevated state), it is also effective in the case of photons released electrically heated.
KRISS senior researcher Myung-Ho Bae said:
At the highest temperature, than the electron temperature graphene lattice acoustic vibration modes is much higher. This unique thermal characteristics allow us to graphene suspension is heated to the temperature of the sun half, and with respect to the solid substrate work efficiency 1000-fold.
Currently, researchers are trying to improve the photothermal device so that it can quickly on / off (generates 0 and 1 signals) and used in optical communications. Of course, they will be incorporated into the flexible material exploration methods.