LIGHT-EMITTING ELEMENT AND METHOD FOR MANUFACTURING SAME, AND LIGHT EMISSION METHOD

• Main Authors: KIKUCHI KATSUHIRO, ITO ASAE, TSUKAMOTO YUTO, KAWATO SHINICHI, NIBOSHI MANABU, KOIKE EIJI
• Format: Patent
• Language: Chinese; English
• Published: 31.07.2018
• 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

An organic EL element (10), having: a first light-emitting layer (33a) containing, from among a host and a TTF material, at least the TTF material, and having the shortest emission peak wavelength from among light-emitting layers (33); a second light-emitting layer (33b) containing at least a TADF material; and a third light-emitting layer (33c) containing at least a fluorescent material and having the longest emission peak wavelength from among the light-emitting layers (33). The excited triplet level of the TTF material is lower than the excited triplet level of the TADF material. 有机EL元件(10)具有：第发光层(33a)，其在发光层(33)中发光峰值波长最短、且含有主体材料和TTF材料中的至少TTF材料；第二发光层(33b)，其至少含有TADF材料；和第三发光层(33c)，其在发光层(33)中发光峰值波长最长、且至少含有荧光材料，TTF材料的激发三重态能级低于TADF材料的激发三重态能级。