Title :
Designing an external efficieny of over 30% for light emitting diode
Author :
Kwok, Paul C K ; Chan, Chun-Chung ; Li, E. Herbert
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Hong Kong
Abstract :
In designing high intensity LED´s, substantial increase in efficiency can be achieved with the use of a textured surface, which is characterized by its external quantum efficiency and radiation pattern. We have found that the randomness of the inclined facade surfaces contributes substantially to the enhanced efficiency substantially. Such efficiency is strongly dependent upon the textured surface layer´s thickness and its distance to the active layer of the diode. To attain the maximum efficiency, an optimal range for these parameters is required
Keywords :
light emitting diodes; optical design techniques; surface texture; surface topography; active layer; enhanced efficiency; external efficieny; external quantum efficiency; high intensity LED design; inclined facade surfaces; light emitting diode; maximum efficiency; optimal range; radiation pattern; textured surface; textured surface layer thickness; Analytical models; Facsimile; Light emitting diodes; Optical fiber communication; Refractive index; Rough surfaces; Semiconductor materials; Surface roughness; Surface texture; Telephony;
Conference_Titel :
Lasers and Electro-Optics Society Annual Meeting, 1998. LEOS '98. IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-4947-4
DOI :
10.1109/LEOS.1998.737792
