A kind of organic light-emitting device and preparation method thereof

Abstract

The invention discloses an organic light-emitting device and a preparation method thereof. The organic light-emitting device includes: a substrate, a first electrode sequentially formed on the substrate, a light-emitting functional layer, and a second electrode; wherein, the first electrode is formed on a surface close to the light-emitting functional layer. A light extraction microstructure, the surface of the light extraction microstructure is located on a spherical surface, and the value range of the diameter D of the sphere corresponding to the spherical surface is: 100nm≤D≤100μm. The technical solutions provided by the embodiments of the present invention enable each light extraction microstructure to effectively extract at least one of red light, blue light, green light or yellow light out of the organic light emitting device, thereby significantly improving the light extraction efficiency of the organic light emitting device.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of light emission, and in particular to an organic light emitting device and a preparation method thereof. Background technique [0002] At present, the internal quantum efficiency of organic light-emitting devices is close to 100%, but the external quantum efficiency is only limited to about 20%, which greatly limits the improvement of the power efficiency of organic light-emitting devices. [0003] In the prior art, the light extraction efficiency is improved by arranging a light extraction structure inside the organic light emitting device, so as to improve the external quantum efficiency, and then improve the power efficiency of the organic light emitting device. Commonly used light extraction structures include the following two types: 1. Microstructures with random sizes formed by etching or phase separation; 2. Microstructures with fixed periods. The size of the microstructu...

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Problems solved by technology

The size of the microstructure in the former light extraction structure is random, and the proportion of microstructures that can effectively extract red light, blue light, and green light or yellow light is poorly controllable, which will cause additional shoulder peaks on the luminescence spectrum to a certain extent, and then The period of the microstructure in a light extraction structure is fixed, which can only effectively extract the light of a specific luminous color, and cannot take into account the light of other colors

Therefore, organic light-emitting devices with the above two light extraction structures, especially white organic light-emitting devices, can neither effectively maintain the stability of the peak position of the light-emitting spectrum nor achieve controllable adjustment of the spectrum while improving the luminous efficiency of the device.

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