A typical led consists of a luminous LED chip surrounded by a transparent protective dome / lens. Although most of the light generated by the chip goes directly through the shell, some of it is reflected back to the inside.
Unfortunately, the reflected light is wasted because it does not enter the diode environment to provide illumination. In addition, it will increase the temperature inside the diodes, causing the chips to degrade faster – which means LEDs won’t last as long as other lighting methods do.
to find a solution to this problem, scientists at Imperial College London and Indian Institute of technology have recently developed a computer model in which a layer of transparent cheap metal nanoparticles is added between the LED chip and its shell.
these particles act a little like a microlens mesh, which changes the angle of light coming into contact with the shell material. As a result, more than 20% of the light can pass through rather than be reflected back. This means that the same amount of electricity can release more light, and the LED should have a lower temperature, so its service life will be longer.
the current plan is to use this technology to produce prototype diodes, so that variables such as nanoparticle material, size, shape and spacing can be tested and adjusted.
Dr. debabrata sikdar of IIT Guwahati, co-author of the research paper, said: “although suggestions have been made to improve the enclosure, most of them will make LEDs more bulky or difficult to manufacture, thus reducing the economic impact of the improvements. We believe that based on the basic theory and our detailed, balanced optimization analysis, our innovation can be introduced into existing manufacturing processes with little disruption or volume gain. ” Global Tech