White light emitting organic electroluminescent element and lighting device
View Patent ↗A white light-emitting organic electroluminescent element is disclosed, containing a substrate having thereon: an anode; a cathode; and a plurality of light emitting layers between the anode and the cathode, wherein the plurality of light emitting layers contains: a first light emitting layer which emits a light having a predetermined wavelength; a second light emitting layer which is located at a nearer position to the anode than the first light emitting layer and emits a light having a complementary color to the light having the predetermined wavelength; and a third light emitting layer which is located at a nearer position to the cathode than the first light emitting layer and emits the light having the complementary color to the light having the predetermined wavelength.
1. A white light-emitting organic electroluminescent element comprising a substrate having thereon:
an anode;
a cathode; and
a plurality of light emitting layers between the anode and the cathode,
wherein the plurality of light emitting layers comprises:
a first light emitting layer which emits a light having a predetermined wavelength;
a second light emitting layer which is located at a nearer position to the anode than the first light emitting layer and emits a light having a complementary color to the light having the predetermined wavelength; and
a third light emitting layer which is located at a nearer position to the cathode than the first light emitting layer and emits the light having the complementary color to the light having the predetermined wavelength.
2. The white light-emitting organic electroluminescent element of claim 1 ,
wherein one of the first light emitting layer, the second light emitting layer and the third light emitting layer is a blue light emitting layer which emits a light having a maximum luminescent wavelength of 480 nm or less.
3. The white light-emitting organic electroluminescent element of claim 2 ,
wherein both the second light emitting layer and the third light emitting layer comprise:
a green light-emitting material which emits a light having a maximum luminescent wavelength of 510-570 nm; and
a red light-emitting material which emits a light having a maximum luminescent wavelength of 590-650 mm.
4. The white light-emitting organic electroluminescent element of claim 1 ,
wherein at least two of the first light emitting layer, the second light emitting layer and the third light emitting layer comprise a host compound having the same chemical structure.
5. A lighting device comprising the white light-emitting organic electroluminescent element of claim 1 .