| 摘要 |
PROBLEM TO BE SOLVED: To provide a light emitting element, a light emitting device, and an electronic device, in which the length of an optical path can be changed easily through which generated light passes. SOLUTION: A light emitting element comprises a light emitting layer between a first electrode and a second electrode, and a mixed layer in contact with the first electrode. The light emitting layer includes a light emitting material. The mixed layer includes a hole transport material and a metal oxide showing an electron accepting property to the hole transport material, and has a thickness of 120 to 180 nm. The light emitting material emits light when a voltage is applied so that the potential of the first electrode is higher than that of the second electrode. COPYRIGHT: (C)2007,JPO&INPIT
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