Abstract
As display technology advances, organic light emitting diodes (OLEDs) have attracted a lot of attention worldwide due to their light weight, flexibility, wide viewing angle, etc. This paper briefly introduces the history and the different historical OLEDs, including phosphorescence, thermally activated delayed fluorescence (TADF), and triplet-triplet annihilation (TTA). Then, this article mainly presents two kinds of OLEDs. The first is small-molecule OLED with typical three organic layers. The purity of the material is quite high, and it can produce high-quality films with high fluorescence quantum efficiency, which can produce a variety of colors of light. Its disadvantages are poor thermal stability and limited carrier transport capacity. The second is polymer based OLED. Compared with small molecule organic luminescence materials, polymer materials have higher physical strength, better processibility, mechanical properties, and thermal stability. In this regard, recent research progress and the comparison between these two types of OLEDs are proposed. They both are considered the most promising display technologies.
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