TASK Development of technology of high power LED

Problems of the Operation of Power LED

Saturation of LED output power with current density increase.

Reduction of LED output power with active region temperature increase.

Emitting wavelength shift with current and temperature increase;

Reduction of LED operating lifetime with current density increase.

Low light extraction efficiency due to the internal absorption and total internal reflection.

LED overheating due to ohmic dissipation.

Heat removing from LED under high current density operation

Heat removing from the whole lighting system

Reduction of phosphorus conversion efficiency with temperature