Patent attributes
An object of the present invention is to provide a high-efficiency white light emitting element having a spectrum in a wide wavelength range. Another object is to provide a white light emitting element in which chromaticity of white color is hard to change over time. Still another object is to provide a white light emitting element in which the shape of an emission spectrum does not tend to depend on current density. A first light emitting element 310 and a second light emitting element 320 are serially laminated over a substrate 300. The first light emitting element 310 has a light emitting layer 312 between a first anode 311 and a first cathode 313, and the second light emitting element 320 has a light emitting layer 322 between a second anode 321 and a second cathode 323. Here, the light emitting layer 312 shows a first emission spectrum 330 having peaks both in a blue to blue green wavelength range and in a yellow to orange wavelength range, and the light emitting layer 322 shows a second emission spectrum 340 having peaks both in a blue green to green wavelength range and in an orange to red wavelength range.
