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Achieving Solution-Processed Non-Doped Single-Emitting-Layer White Organic Light-Emitting Diodes through Adjusting Pyrene-Based Polyaromatic Hydrocarbon |
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| Authors: | Hongjing Han Sujuan Hu Shilong Zhang Xiaojun Li Hailing Sun Jiawen Chen Baiquan Liu Chuan Liu Wangqiao Chen Qichun Zhang |
| Affiliation: | 1. Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006 P. R. China Theses authors contributed equally. Contribution: Data curation (equal), Formal analysis (equal), Investigation (equal), Writing - original draft (equal);2. School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, 510275 P. R. China Theses authors contributed equally. Contribution: Data curation (equal), Formal analysis (equal), Investigation (equal), Writing - original draft (equal);3. Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006 P. R. China Contribution: Data curation (supporting), Formal analysis (supporting), Investigation (supporting), Writing - original draft (supporting);4. Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006 P. R. China Contribution: Data curation (supporting), Formal analysis (supporting), Investigation (supporting), Writing - review & editing (supporting);5. Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006 P. R. China Contribution: Data curation (supporting), Investigation (supporting), Writing - original draft (supporting);6. Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006 P. R. China Contribution: Formal analysis (supporting), Investigation (supporting), Writing - original draft (supporting);7. School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, 510275 P. R. China;8. School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, 510275 P. R. China Contribution: Formal analysis (supporting), Investigation (supporting), Writing - review & editing (supporting);9. Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006 P. R. China;10. Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, 999077 P. R. China |
| Abstract: | Single-emitting-layer white organic light-emitting diodes (SEL-WOLEDs) have developed rapidly in recent years due to the outstanding advantages of high efficiency, simple device structure, low cost, less phase separation, and stable emission color. Nevertheless, the relatively complicated host-dopant system is usually essential for most previous SEL-WOLEDs and the development of simple non-doped SEL-WOLEDs lags behind. Hence the straightforward synthesis of single-white-emitting molecules for non-doped SEL-WOLEDs still remains a great challengeable task. In this article, we designed and synthesized two new pyrene-based polyaromatic hydrocarbons (PAHs) and used them as emitting layer materials in the OLED devices. When the molecules change from the mono-fused one to bis-fused one, the emitting light changes from greenish to white color. Further study indicated that the bis-fused molecule PyD with more twisted and extended backbone packed in neat Cmca space group in single-crystal system compared with P21/n for PyS, which may be favorable to form excimers in the solid state and broaden the emission spectrum in the OLEDs. As a result, a solution-processed non-doped single-white-emitting-molecule SEL-WOLED with high performance (e. g., a high color rendering index of 66) is reported. The findings will be beneficial not only to further development of simple WOLEDs, but also to other related organic optoelectronic technology. |
| Keywords: | white organic light-emitting diodes polyaromatic hydrocarbons pyrene single-emitting-layer solution-processed |