High efficiency deep blue OLEDs

Jang-Joo Kim; Hyungcheol Lim; Yun Hi Kim

doi:10.1117/12.2595922

1 August 2021 High efficiency deep blue OLEDs

Jang-Joo Kim, Hyungcheol Lim, Yun Hi Kim

Proceedings Volume 11808, Organic and Hybrid Light Emitting Materials and Devices XXV; 118080R (2021) https://doi.org/10.1117/12.2595922
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States

Abstract

In this talk, we will firstly present a strategy to realize deep blue TADF OLEDs with the EQE of 28% and CIE y value of 0.09 by narrowing the emission spectrum of blue TADF emitters along with high horizontal emitting dipole orientation. Secondly we will present deep blue OLEDs utilizing TTA process based on anthracene derivatives. For blue-emitting anthracene derivatives, the theoretical maximum contribution of TTA to emissive singlet excitons is considered to be 15%, which is insufficient for high-efficiency fluorescent devices. In this study, we realised a TTA contribution of nearly 25% using an anthracene derivative, breaking the theoretical limit. As a result, efficient deep-blue TTA fluorescent devices were developed, which exhibited maximum external quantum efficiencies of 10.2%. A theoretical model will be presented to explain the experimental results considering both the TTA and RISC to a singlet state from a high level triplet state formed by the TTA process.

Conference Presentation

Citation Download Citation

Jang-Joo Kim, Hyungcheol Lim, and Yun Hi Kim "High efficiency deep blue OLEDs", Proc. SPIE 11808, Organic and Hybrid Light Emitting Materials and Devices XXV, 118080R (1 August 2021); https://doi.org/10.1117/12.2595922

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