A high efficiency light emitting diode

• Main Authors: SHIN, KWANG-KUO, LEAN, ERIC G, LIU, YUNG-SHENG, CHUI, CHIENIA+, HO, JIN-KUO
• Format: Patent
• Language: English
• Published: 28.05.2001
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; SEMICONDUCTOR DEVICES

The present invention reveals a high efficiency light emitting diode (LED), mainly by roughening the light transmitting surface of LED, or building a LED with domed surface or approximately cylindrical structure, so that in one respect the critical angle of total internal reflection is increased to avoid the generation of total internal reflection and the light not being emitted out when the light passes through the rough surface and refracts, in the other respect the light will emit from the curved surface of the cylinder radially, but not emit from four faces as confined in the traditional cube structure, the emitted light is thus concentrated in the range of critical angle to reduce the loss of light-emitting efficiency due to the critical angle of total internal reflection, most of the emitted light can come out and hence the external quantum efficiency of LED is increased.