OLED and PLED Materials

OLED is an emerging display and lighting technology that can realize beautiful and efficient display and lighting panels. Thin OLEDs have been used in many mobile devices and TVs. There are two main types of OLEDs: OLEDs based on small molecules and polymer OLEDs. Two materials can be used to make OLEDs: small molecules (SM-OLED) or large molecules or polymers.

Almost all OLED displays on the market use small molecules and are produced using an evaporation process. A typical double-heterostructure small-molecule OLED consists of three organic layers sandwiched between electrodes. The organic layers adjacent to the cathode and anode are an electron transport layer and a hole transport layer, respectively. The emissive layer is usually composed of luminescent dyes or dopants dispersed in a suitable host material. Alfa Chemistry provides you with products suitable for each OLED layer.

Fig 1. OLED discovery pipeline: Diagram of the high-performance OLED discovery. (Lu S. Y, et al. 2018)

Polymer OLED (or PLED, also known as P-OLED) is an OLED device made of polymer materials. In terms of lifespan and efficiency, the material performance of PLED is not as good as SM-OLED, but easy to dissolve, so it is easily applicable to printing and other solution-based processes. PLED has a relatively simple structure, the light-emitting polymer layer in a single solution of the device. The treatment layer combines the main body, emitter and charge transport functions. We provide a variety of major chemical classes of LEPs, which prove their usefulness for PLED research, including polyphenylene vinylene and polyfluorene polymers.

Fig 2. Schematic structure of solution processable OLED devices. (Zhong C. M, et al. 2011)

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References

Lu S. Y, et al. (2018). "Virtual Screening of Hole Transport, Electron Transport, and Host Layers for Effective OLED Design." Journal of Chemical Information and Modeling. 58(12): 2440-2449.
Zhong C. M, et al. (2011). "Materials and Devices toward Fully Solution Processable Organic Light-Emitting Diodes." Chemistry of Materials. 23(3): 326-340.