Beginning of this century to start a revolution of light, and have spent over a hundred years of the incandescent lamp (Incandescent Lamp) and fluorescent (Fluorescent Lamp) is about to walk into history. In the next few years, LED lights will become the lighting (lights) and display (eg, television) mainstream. 2009, the global LED output value of about $ 7.6 billion, Japan is the output value of the first countries, Taiwan, compared with the largest output
Taiwan semiconductor manufacturing Kingdom, also has the most MOCVD crystal growth machine. Taiwan wave of momentum in this sparkling revolution ascribed LED largest chip production host country. But like a CD-ROM of the past and present of DRAM must pay expensive royalties, LED patent subject to the foreign companies. “Smile curve” so that the profits of large foreign companies patent is much larger than the value of hard production LED.
LED brightness will decrease with increasing temperature, its life will be more acute, according to shorten. Downstream of the LED’s heat sink is mostly made in aluminum and its copper circuits are based on the adiabatic epoxy (Epoxy) separated by insulation. Epoxy resin of the thermal conductivity (0.5 W / mK) than aluminum (275 W / mK) the low hundreds of times, the LED chip generated heat is long poly difficult to loose. DTC higher than the copper heat transfer coefficient (400W/mK) DLC (500 W / mK) insulated copper wire, so you can achieve significant cooling effect (Figure 6 to Figure 14). DLC coated printed circuit board (Print Circuit Board, PCB), has been supplied to the number of Taiwan’s LED manufacturers, more production and the amount of the MSC crystal diamond companies in China.
The current white LED blue light excitation of the yellow phosphor (YAG or TAG) and complementary composition of white light. The phosphor mother (Carrier) often oxides, while the light source (the Activator) atoms for the rare earth elements (eg, Ce, Eu). Oxides for the polar compounds (Ionic Compound), it will absorb moisture and deliquesce. What is more, the light atom is too large so that the mother combined with the key can not, at a high temperature, large atom diffusion (Diffusion) and Segregation (Segregation) emitted light scattered aliasing. In addition, the concentration of light atoms in the mother’s body is not high, the phosphor absorbed luminous intensity.
Super LED’s dream come true, the phosphor can be switched to the nitride. Such as (In, Ga) N for the mother and the light source. Then adjust the In and Ga ratio can be any light color red, green, blue and their combinations, including white. This UV PL (Photo Luminescence, PL) transcended the traditional phosphors must be powder thinking Framework (Paradigm) instead plated multilayer light epitaxy by MOCVD plus on in UVLED chip can.
Conclusion
Prelude to the mainstream technology of LED light revolution, the real breakthrough is made of high-powered super LED UV light source. Diamond Island wafer as a bridge to high-pressure diamond synthesis technology and vacuum vapor-phase synthesis method combined manufactured super LED, including the diamond LEDs, AlN / the Diamond of cBN / the Diamond LED of AlN / of cBN LED and other yet to be developed the the next generation of LED products. Starting point, in-depth diamond technology leading diamond made of the world’s first island of the wafer, so that you can super-large-scale production of LED. Taiwan’s LED technology companies can develop this leapfrog technology, Taiwan’s LED industry can not only get rid of the curse of the “smile curve” to Taiwan from the silicon island to upgrade to Diamond Island.