Now, research teams from Columbia University, Seoul National University (SNU), and the Korea Institute of Standards Science have used the same element—the perfect crystalline form of carbon (graphene)—to make the world's thinnest light bulb.
Although its filament is only as thick as a layer of atoms, the light it produces can still be easily seen by the naked eye.
Professor Young Duck Kim and Professor James Hone.
By attaching the graphene microfilaments to the metal electrodes and then suspending them on the silicon substrate, current is passed through the filaments and heated to over 2500 ° C (4500 ° F), thereby emitting very bright light.
The researchers used graphene to make the world's thinnest on-chip source.
James Hone, a professor of mechanical engineering at Columbia University, said:
“We have created the world's thinnest light bulb, and this new 'broadband' light source can be integrated into the chip and paved the way for thin, atomic flexible transparent displays and graphene-based on-chip optical communication†.
We adopt the advanced technology imported from Europe, patented technology, specialized software to optimize the design for Dry Type Transformer. The core is made of cold-rolled grain-oriented silicon steel sheet which cut in step-lap by GEORG Germany TBA core cutting lines and laminated by the method of fifth-order step-by-step stacking technology, enabling the no-load performance of the core to improve greatly. The epoxy resin from American HUNTSMAN is adopted for the windings which casted in the vacuum resin casting machine imported from HEDRICH, Germany. The winding material ensures good permeability, no bubbles occur, which leads to minimum partial discharge. The HV and LV winding mate with each other tightly, which ensures solid strength of structure and capability to withstand short circuit and vibration. Under normal service condition, the service life of dry type transformer is 30 years. No crack will form on the surface of transformer winding due to temperature variation as long as the transformer runs under normal service condition.
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