Light emitting microcapsule, method of preparing the same and OLED display device comprising the same

Abstract

The present invention, which belongs to the technical field of display technology, provides a microcapsule, a method of preparing the same, and an OLED (organic light emitting diode) display device comprising the same. The OLED display device comprises a microcapsule having a phosphorescent material as a core material, which reduces the probability of the phosphorescence self-quenching and is isolated from water and oxygen, thereby improving the display quality and extending the service life of the OLED display device. Therefore, the OLED display device can solve the problem that the phosphorescence OLED display device in the prior art has a low brightness and short service life.

Description

FIELD OF THE INVENTION[0001]The present invention relates to the technical field of display technology. More particularly, the present invention relates to a light emitting microcapsule, a method of preparing the same, and an OLED (organic light emitting diode) display device comprising the same.BACKGROUND OF THE INVENTION[0002]The research of OLED devices has been developed comprehensively and thoroughly since the light emitting phenomena of organic molecules was discovered by Professor Qingyun Deng. OLED devices have been widely applied in the field of display technology because these devices have advantages of high efficiency, low power consumption, wide color gamut and the like. Based on the light emitting material, OLED can be substantially classified into two kinds, one comprising fluorescent material and the other comprising phosphorescent material. More attention has been paid to the phosphorescent material due to its high internal quantum efficiency.[0003]However, the phosp...

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Benefits of technology

[0016]In the present invention, phosphorescent material is microencapsulated so that the phosphorescent materials in adjacent microcapsules do not contact each other, and the amount of the phosphorescent material within each microcapsule is relatively small, thereby effectively reducing the quenching probability of the phosphorescence material due to the molecular stacking thereof, and further avoiding the phosphorescence losses due to the phosphorescence quenching and improving the lightness of phosphorescent OLED display device. Moreover, the phosphorescent material is wrapped in the microcapsule, and this effectively prevents the permeation of the moisture and / or oxygen in the environment, thereby reducing the probability of the reaction of the moisture and / or oxygen with the phosphorescent light emitting material, and further effectively extending the life of the phosphorescent material as well as improving the life of the phosphorescent OLED display device.

Problems solved by technology

However, the phosphorescent material tends to experience self-quenching for the triplet state of molecular excitation.

Especially in the case of high current density, the phosphorescence material is more easily to suffer from a loss as a result of the self-quenching, thereby reducing the lightness of a phosphorescent OLED.

In addition, although the research and development techniques of the phosphorescent OLED devices has been relatively mature at a laboratory level, but there still exists some problems in practical, for example, the life of a phosphorescent OLED device is susceptible to the environment.

It is well known that the phosphorescent OLED device is extremely susceptible to moisture and oxygen, especially the moisture.

If the moisture permeates into the device, a dark spot in the light-emitting region, which will expand over time, is easily caused, thereby affecting the display quality and the life of the device.

However, for these prior art, there are disadvantages such as surface irregularities (such as in the case of metal cover plate encapsulation) and occurrence of microcracks (such as in the case of glass cover plate encapsulation), as well as high-costs and the complicated production process (such as in the case of Barix thin film encapsulation).

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