Organic light-emitting device packaging structure and packaging method thereof

Abstract

The invention discloses an organic light-emitting device packaging structure comprising an anode conductive substrate, and an organic light-emitting functional layer, a metal cathode and a packaging layer which are sequentially stacked on the anode conductive substrate. The packaging layer comprises a germanium oxycarbide layer, a first barrier layer and a second barrier layer, which are sequentially stacked on the metal cathode. The first barrier layer is made of chlorine-doped R2O3, wherein R is an element in the group IIIA. The second barrier layer is made of chlorine-doped titanium oxide, chlorine-doped zirconium oxide or chlorine-doped hafnium oxide. The packaging structure has excellent performance in oxygen and moisture barrier, and can effectively release the film stress and significantly improve the service life of organic light-emitting devices. The invention further provides an organic light-emitting device packaging method which is applicable to the packaging of organic light-emitting devices prepared with a conductive glass substrate, and especially applicable to the packaging of flexible organic light-emitting devices packaged with a plastic or metal substrate.

Description

technical field [0001] The invention belongs to the packaging field of organic electroluminescent devices, and in particular relates to a packaging structure and a packaging method of organic electroluminescent devices. Background technique [0002] Organic electroluminescent device (OLED) is a current-mode semiconductor light-emitting device based on organic materials. Its typical structure is to prepare a layer of tens of nanometers thick organic light-emitting material on the ITO glass as the light-emitting layer, and the top of the light-emitting layer is a metal electrode. When a voltage is applied to the electrodes, the light-emitting layer produces light radiation. [0003] Organic electroluminescent materials are particularly sensitive to the intrusion of oxygen and water vapor. On the one hand, because oxygen is a quencher, the quantum efficiency of light emission will be significantly reduced, and the oxidation of oxygen to the hole transport layer will also reduc...

AI Technical Summary

Problems solved by technology

Flexible products are the development trend of organic electroluminescent devices. The difference between flexible organic electroluminescent devices and ordinary organic electroluminescent devices is that plastics are used as substrates, and the flatness of plastic substrates is poor, resulting in many structural defects in the device film layer, causing The device is damaged; moreover, the barrier properties of commonly used plastic substrates cannot meet the requirements of OLED packaging, so flexible organic electroluminescent devices generally have the problem of short life

At present, it has been reported that SiN x or SiO x Inorganic materials, such as magnetron sputtering, are placed on the surface of the metal cathode by methods such as magnetron sputtering, and are used as the packaging layer of organic electroluminescent devices. However, under the high temperature operating conditions of magnetron sputtering, the surface of the metal cathode is easily damaged.

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