| abstract |
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. n 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) |