| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly efficient white light-emitting element having spectrum in a wide wavelength region, in which white chromaticity is less likely to change over time, and the shape of emission spectrum is less likely to depend on the current density.SOLUTION: A first light-emitting element 210 and a second light-emitting element 220 are laminated in series on a substrate 200, the first light-emitting element 210 has a structure where there is a luminous layer 212 between a first positive electrode 211 and a first negative electrode 213, and the second light-emitting element 220 has a structure where there is a luminous layer 222 between a second positive electrode 221 and a second negative electrode 223. Here, the luminous layer 212 shows a first emission spectrum 230 having peaks in both regions of blue-bluish green and yellow-orange, and the luminous layer 222 shows a second emission spectrum 240 having a peak in the region of orange-red.SELECTED DRAWING: Figure 2 |
