LIGHT EMITTING ELEMENT, DISPLAY DEVICE AND LIGHTING SYSTEM

• Main Author: FUKUDA TOSHIHIRO
• Format: Patent
• Language: English; Japanese
• Published: 05.01.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; SEMICONDUCTOR DEVICES

PROBLEM TO BE SOLVED: To provide a light emitting element including a first reflection interface, a second reflection interface and a third reflection interface and capable of expanding color gamut furthermore by an interference filter comprising the reflection interfaces.SOLUTION: A light emitting element includes: a first electrode 31; a second electrode 32; and an organic layer 33 provided between the first electrode 31 and the second electrode 32 and comprising a first luminous layer 34 and a second luminous layer 35 which are laminated from a side of the first electrode. Light emitted from the organic layer 33 is reflected at a first reflection interface between the first luminous layer 34 and the first electrode 31, and passes through the second electrode 32 to be emitted to the outside. A first optically transparent layer 41, a second optically transparent layer 42 and a third optically transparent layer 43 are provided in order from a side of the second luminous layer, on the second luminous layer 35 on the side opposite to the first luminous layer 34. Positions of the first reflection interface, a second reflection interface, a third reflection interface and a fourth reflection interface are defined on the basis of predetermined conditions. 【課題】第１反射界面、第２反射界面及び第３反射界面を備え、これらの反射界面によって構成される干渉フィルタによって色域の一層の拡大を図り得る発光素子を提供する。【解決手段】発光素子は、第１電極３１、第２電極３２、及び、第１電極３１と第２電極３２との間に設けられ、第１電極側から第１発光層３４及び第２発光層３５が積層されて成る有機層３３を備えており、有機層３３からの光が、第１発光層３４と第１電極３１との第１反射界面において反射され、第２電極３２を通過して、外部に出射され、第２発光層３５の第１発光層３４とは反対側には、第２発光層側から、第１光透明層４１、第２光透明層４２及び第３光透明層４３が設けられており、第１反射界面、第２反射界面、第３反射界面及び第４反射界面の位置が所定の条件に基づき規定されている。【選択図】 図１