ORGANIC ELECTROLUMINESCENT DEVICE, DISPLAY DEVICE, LIGHTING DEVICE

• Main Authors: YAMAGUCHI HIROYUKI, TANAKA JUNICHI, KIDO JUNJI, UMETSU MASAYUKI
• Format: Patent
• Language: English; Japanese
• Published: 06.10.2022
• Subjects: ADVERTISING; BASIC ELECTRIC ELEMENTS; CRYPTOGRAPHY; DISPLAY; DISPLAYING; EDUCATION; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; LABELS OR NAME-PLATES; PHYSICS; SEALS; SEMICONDUCTOR DEVICES; SIGNS

To provide an organic electroluminescent element with a multi-photon emission structure that enables low-voltage driving with excellent element stability, and a display device and a lighting device equipped with such an organic electroluminescent element.SOLUTION: An organic electroluminescent device includes an anode and a cathode, and has a structure in which a plurality of light-emitting units each including a light-emitting layer containing an organic compound are laminated with a charge-generating layer sandwiched between the anode and the cathode, and at least one of the light-emitting units has at least one electron injection layer containing a lanthanide metal at a position closer to the cathode than the light-emitting layers included in the light-emitting unit, and a display device and a lighting device include the organic electroluminescent element.SELECTED DRAWING: Figure 1 【課題】素子の安定性に優れた低電圧駆動が可能となるマルチフォトンエミッション構造の有機エレクトロルミネッセント素子、並びに、そのような有機エレクトロルミネッセント素子を備えたディスプレイ装置および照明装置を提供する。【解決手段】陽極及び陰極を有し、前記陽極と前記陰極との間に、有機化合物を含有する発光層を含む複数の発光ユニットが電荷発生層を挟んで積層された構造を有する有機エレクトロルミネッセント素子であって、前記発光ユニットのうち少なくとも１つは、当該発光ユニットに含まれる発光層よりも前記陰極に近い位置に、ランタノイド金属を含有する電子注入層を少なくとも１層有する、有機エレクトロルミネッセント素子、上記有機エレクトロルミネッセント素子を備えたディスプレイ装置および照明装置。【選択図】図１