| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-photon organic EL device that has high light-extraction efficiency by increasing a light quantity generated inside the organic EL device, and also to provide a lighting apparatus, a planar light source, and a display apparatus. SOLUTION: An organic EL device 10 is equipped with: a support substrate 15; a positive electrode (a first electrode) 14 provided in contact with the support substrate 15 and having the light permeability; a negative electrode (a second electrode) 16 being the other electrode; first/second light-emitting units 11, 12 provided between both electrodes and respectively including an organic light-emitting layer; and a charge generating layer 13 arranged while being sandwiched by the first/second light-emitting units. The charge generating layer 13 includes one or more kinds selected from the group (A) consisting of metals and compounds of the metals respectively having a work function of≤3.0 eV, and one or more kinds of compounds (B) respectively having a work function of≥4.0 eV. Each of the refractive index n1 of the positive electrode 14 and the refractive index n2 of the support substrate 15 satisfis a formula (1). COPYRIGHT: (C)2010,JPO&INPIT
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