Organoelectroluminescent element, and light emission device, display device, and illumination device in which said organoelectroluminescent element is used
摘要
說明書
Investigation by the present inventors has revealed that, when a light-emitting material is used which is oriented in the horizontal direction with the substrate in the light-emitting layer and in which the order parameter is at least 0.7, the proportion of the emission of a component that undergoes quenching by metals is much lower than with an unoriented light-emitting material. The present invention is an organoelectroluminescent element that makes use of a light-emitting material that is oriented horizontally with respect to the substrate, wherein the thickness of the organic layer between the light-emitting layer and the anode (this corresponds to the thickness T1 (nm) of the aforementioned first intermediate organic layer) and the thickness of the organic layer between the light-emitting layer and the cathode (this corresponds to the thickness T2 (nm) of the aforementioned second intermediate organic layer) satisfy the relationship described above, the result of which is the discovery that it is possible to provide an organoelectroluminescent element in which the optimal length of optical interference can be achieved, and the thickness of the second intermediate organic layer (such as the electron injection layer or electron transport layer) can be reduced, so high external quantum efficiency and high power efficiency can both be satisfied at the same time.
