An organic light-emitting diode (OLED) is a light-emitting diode (LED) in which the emissive electroluminescent
layer is a film of organic compound that emits light in response to an electric current. OLED emissions to virtually any color,
including white, are matched with every possible color temperature. Most white OLEDs consist of a red, a green and a blue emission layer,
together produce high quality white light. an OLED is only slightly heated in operation. So you can always be touched without being uncomfortably hot.
However, the area of an OLED has another advantage. The average life of an incandescent lamp is about 1000 hours. Thereafter,
the filament burns out and it must be replaced. In contrast, OLED is a gradual drop in the luminous flux takes place. That is,
the OLED does not burn through in the conventional sense but lost in the course of their lifetime of light output and luminosity.
Typically, the life time is defined as the period during which the light current drops to 70% of the initial luminous flux (L70).