White color light of organic light emitting diode

An organic light emitting diode (OLED), emitting a white color light suitable for irradiating on plants, and comprising:

• a cathode;
• an anode;
• an electron transporting layer, disposed between the cathode and the anode;
• a hole transporting layer, disposed between the anode and the electron transporting layer;
• a first organic light emitting layer, disposed between the electron transporting layer and the hole transporting layer, and emitting a first color light, wherein a peak in a frequency spectrum of the first color light is within a first wavelength range;
• a second organic light emitting layer, disposed between the electron transporting layer and the hole transporting layer, and emitting a second color light, wherein a peak in a frequency spectrum of the second color light is within a second wavelength range;
• and
• a third organic light emitting layer, emitting a third color light, wherein a peak in a frequency spectrum of the third color light is within a third wavelength range, wherein the third color light comprising a dark blue light;
• wherein the white color light is used to irradiate plants so as to improve plant growth, and wherein the white color light is at least formed by mixing the first color light, the second color light and the third color light, an intensity of a frequency spectrum of a wavelength ranging from 520 nm to 580 nm is substantially equal to or less than 20% of a total intensity of a frequency spectrum of the white color light, the frequency spectrum of the white color light and the response frequency spectrum of plant photosynthesis are highly overlapped, and thus the white color light can be efficiently absorbed and utilized by plants.