Abstract

LEDs which have many merits are widely used in the field of light devices, and have rapidly replaced old light devices such as incandescent or fluorescent lamps. Long life, on the order of 50,000 to 100,000 hours, is one of the key features of light emitting diodes(LEDs) that has attracted the lighting community to this technology. High Power white LEDs have yet to demonstrate this capability. This paper planed accelerated life test that has two factor(temperature, current) and two levels. Finally, using ALTA programs, we estimated the common shape parameter of Weibull distribution, life-stress relationship, B10 life and accelerating factors.

Keywords

• White LED;
• Accelerated Life Test;
• YAG:CE phosphor;
• Lens Yellowing

• 백색 발광다이오드;
• 가속수명시험;
• YAG:CE 형광체;
• 렌즈 황변;