Optimization of fluorescent powder to enhance the efficiency of LED lighting

"It is not entirely sure what can make the fluorescent powder efficiently and what doesn't," the researchers said in the wrong main agent, some photons will to waste heat, so the key question is: how to choose the correct matrix. As LED becomes more and more bright, for example, it is used in automotive headlamps, which makes them more and more hot, so it inevitably affects the characteristics of phosphors.

By determining the simple guidelines, University of California-Santa Barbara (UCSB) researchers and semiconductor lighting energy center has been able to optimize the phosphor - this is a key component of white LED lighting, so that light brighter and more efficient. Until recently, the phosphor material preparation is not very scientific, more like art, such as looking for preparation based on activator ion (activatorions) matrix (host) crystal structure, which can be of high energy and low energy light into yellow or orange light. "It is not entirely sure what can make the fluorescent powder efficiently and what doesn't," the researchers said in the wrong main agent, some photons will to waste heat, so the key question is: how to choose the correct matrix.

As LED becomes more and more bright, for example, it is used in automotive headlamps, which makes them more and more hot, so it inevitably affects the characteristics of phosphors. "With the rise of temperature, very few phosphors can maintain the original efficiency. The researchers said, "still do not understand how to choose the matrix structure given activator ions, i.e. how to make efficient fluorescent powder, fluorescent powder, how to keep the temperature rising time. However, based on the density functional theory (developed by Professor UCSB), the researchers have determined that the crystal structure of the hardness (rigidity) is a key factor in the efficiency of phosphors. The higher the efficiency of fluorescent powder, the greater the structural hardness. Moreover, the structural hardness can be calculated by the density functional theory, which makes the material can be screened before preparation and testing. This breakthrough can make semiconductor lighting more efficient and bright, thus accelerating its development. "Our goal is to achieve efficiency of 90%, or 300lm/W," the researchers said, they have demonstrated the efficiency of up to 60% of the test products.