LIGHT EMITTING ELEMENT AND LIGHT EMITTING DEVICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a high-efficiency white light emitting element which has a spectrum in a wide wavelength range and in which chromaticity of white color is hard to change over time and the shape of an emission spectrum does not tend to depend on current density. SOLUTION: 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 is so structured as to have a light emitting layer 312 between a first positive electrode 311 and a first negative electrode 313, and the second light emitting element 320 is so structured as to have a light emitting layer 322 between a second positive electrode 321 and a second negative electrode 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. COPYRIGHT: (C)2006,JPO&NCIPI