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The Patent Analysis of Thermally Activated Delayed Fluorescence Materials  

Jo, Dae Seong (Ajou University, College of Engineering, Dept. Chemical Engineering)
Sung, Min Jae (Ajou University, College of Engineering, Dept. Chemical Engineering)
Kim, Min Ho (Ajou University, College of Engineering, Dept. Chemical Engineering)
Choi, Seung Chul (Ajou University, Graduate School of Energy System)
Publication Information
Journal of the Semiconductor & Display Technology / v.18, no.1, 2019 , pp. 105-111 More about this Journal
Abstract
The TADF (Thermally Activated Delayed Fluorescence)-based OLED patents were analyzed and 4410 of patents were selected at the first step. And 975 patents were screened at second step. Finally, 39 key patents were selected. Patent qualitative analysis was performed in these patents to find which of the four property (lifetime, efficiency, color purity, driving voltage) of TADF was improved. Also, the variation of the hosts and dopants in patented TADF material were surveyed and their combination was analyzed. According to the analysis of the variation and the combination, some of TADF compounds were used as an assistant dopant to transfer energy. In addition, it tended to transfer energy by forming exciplex that shows TADF characteristics. These were similar to the mechanism of the introduced hyper fluorescence and could solve the inherent TADF problems. Finally, patent citation network was illustrated to visualize the patent citations and citations relationship of the major applicants in the current TADF-based OLED technology. The leading patent applicant organization was revealed as Idemitsu Kosan, Semiconductor Energy Laboratory, UDC, Princeton University, Merck and Nippon Steel & Sumikin Chemical, which had lots of reference patents 559, 524, 477, 310, 258, and 167, respectively.
Keywords
Thermally Activated Delayed Fluorescence; TADF; OLED; Hyper Fluorescence; Patent Analysis; Patent Citation Network;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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