| This paper explains the method used by researchers to improve Light Emitting Diode (LED) extraction efficiency. It also summarizes the works of different researchers on the improvement in light extraction efficiency (LEE) of an LED. In current practice, a commonality was observed where many researchers tried to improve LEE through the use of micro repeating structures (MRS). MRS comes in the shape of pyramid, lens, cylinder, perforated holes or a combination of a few random shapes. The LEE of an LED could be improved by placing a uniformly aligned or abruptly patterned MRS onto the LED surface in the desired area of projection. This review looks at the possibility of using mesoporous thin film (MTF) with ordered pore to improve LEE due to the presence of uniform MRS (a structure which consists of silica and air array). |
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