| 摘要 |
An organic electroluminescent device having a capping layer composed of material having a high refractive index that involves only small differences in refractive indices measured in the blue, green, and red wavelength regions, excelling in thin film stability and durability and having no absorption in the respective wavelength ranges of blue, green, and red is provided to improve device characteristics of the organic electroluminescent device, particularly to greatly improve the coupling-out efficiency.;The organic electroluminescent device includes at least an anode, a hole transport layer, a light emitting layer, an electron transport layer, a cathode, and a capping layer in this order, wherein the capping layer contains a phthalic acid derivative represented by the following general formula (1) |
| 主权项 |
1. An organic electroluminescent device comprising an anode, a hole transport layer, a light emitting layer, an electron transport layer, a cathode, and a capping layer in this order, wherein the capping layer contains a phthalic acid derivative represented by the following general formula (1) wherein R1 to R4 may be the same or different, and represent a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, hydroxyl, cyano, trifluoromethyl, nitro, linear or branched alkyl of 1 to 8 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 8 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or substituted or unsubstituted aryloxy; R5 and R6 may be the same or different, and represent a hydrogen atom, a deuterium atom, linear or branched alkyl of 1 to 8 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group; R7 and R5 may be the same or different, and represent cycloalkyl of 5 to 10 carbon atoms that may have a substituent; and R1 to R4 may bind to each other between adjacent groups to form a ring. |
