Spectra and Performance of Fluorescent / Phosphorescent Hybrid White OLEDs. The picture shows a large-area light-emitting plate prepared based on this structure (150mm*75mm)

Researchers at the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Ma Dongge, etc. have made new advances in the research of fluorescent/phosphorescent hybrid white OLEDs. The relevant results were published in the international journal Adv. Mater., 2014, 26, 1617.

At present, OLED lighting has attracted great attention from academics and industry. Since the stability of blue phosphorescent materials has not been solved, fluorescent/phosphorescent hybrid luminescence is considered to be the best way to achieve OLED lighting applications. Hybrid white OLEDs have become a hot spot in the field of organic luminescence research. In 2006, the Forrest group of the United States proposed the idea of ​​adding an intermediate layer between fluorescent and phosphorescent light-emitting layers (Nature, 2006, 440, 908). This structure achieves fluorescence and phosphorescence using different diffusion lengths of singlet and triplet excitons. While emitting at the same time, although the luminous efficiency has been improved, the device structure is more complicated and the spectral stability is worse.

Researchers at Changchun Institute of Applied Chemistry have used blue fluorescent materials with higher triplet energy levels doped into bipolar blended host materials to produce high-performance hybrid white light without using an intermediate layer between fluorescent and phosphorescent light-emitting layers. OLED. This hybrid OLED structure without an intermediate layer is relatively simple, not only has high luminous efficiency, but also has a very stable spectrum. It has been found that the bipolar blending body can effectively suppress the mutual quenching between fluorescence and phosphorescence, and that the return of endothermic energy between the blue fluorescent material and the adjacent phosphorescent material reduces the triplet energy loss, thereby eliminating the use of intermediate The layer can obtain higher luminous efficiency. This hybrid white light OLED that takes into account both high efficiency and spectral stability has good practical value in lighting applications.

Changchun Yinghua has obtained a series of research results in the research of fluorescent/phosphorescent hybrid OLEDs. Related work has been published in Org. Electron., Appl. Phys. Lett., J. Appl. Phys., J. Mater. Chem. C, et al. In the magazine, he was invited to write a review article (Materials Today, 2014, 17, 175). These efforts have received project support from the State Fund Committee, the Ministry of Science and Technology, the Chinese Academy of Sciences and Jilin Province.

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