Nanocrystalline copper iodide enabling high-efficiency organic LEDs

Abhijeet Choudhury, Mangey Ram Nagar, Luke The, Yun-Jie Lin, Yu-Hong Liang, Sun-Zen Chen, Jwo-Huei Jou,

Organic Electronics, Volume 111, 2022, 106668, ISSN 1566-1199,

https://doi.org/10.1016/j.orgel.2022.106668

High-efficiency organic light-emitting diodes (LEDs) can be achieved by employing efficiency-effective materials coupling with suitable device architectures.

Among them, there have been numerous hole-injection and -transport materials reported, but having issues of high-cost, solution-process feasibility, and toxic solvent involvement. In this paper the researchers demonstrate a low-cost solution-processable nanocrystalline copper iodide (CuI) as a hole-injection and -transport material for the fabrication of high-efficiency organic LED.

Outcoupling efficiency is a crucial factor that help in the OLEDs efficiency enhancement. To measure the outcoupling efficiency of OLEDs, which has amorphous CuI and nanocrystalline CuI as HIL/HTL, optical simulation was performed using SETFOS. For the optical simulation, optical parameter, i.e. refractive index, of all functional layers were provided in the software package.

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Efficient selenium-integrated TADF OLEDs with reduced roll-off