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http://hdl.handle.net/2080/3702
Title: | Acceptor Interlocked Molecular Design for Solution-Processed Stable Deep- Blue TADF and Hyper Fluorescence Organic LED Enabling High-efficiency |
Authors: | Alam, Md Intekhab Ram Nagar, Mangey Nayak, Sandhya Rani Choudhury, A Joub, Jwo-Huei Vaidyanathan, Sivakumar |
Keywords: | TADF emitters Twisting of acceptor |
Issue Date: | Jul-2022 |
Citation: | CRSI NSC-29th conference 2022 organized by IISER Mohali, Chandigarh. June 7-9, 2022 |
Abstract: | Solution processed deep-blue OLEDs with high external quantum efficiency and a long operational lifetime are constrained. In this context, we synthesized two TADF emitters utilizing new design strategy of twisted interlocked acceptor core integrated with carbazole (KCCz) and tert. butyl-carbazole (KCTBC) as donors for solution processed deep-blue TADF OLEDs. Twisting of acceptor core by two methyl groups resulted in complete separation of HOMO and LUMO along with cyanide group facilitate in generating low-lying triplet exited states as suggested by theoretical simulation. Combined effect of both resulted in tuning of emission in ultra-deep blue region through the efficient population of triplet excitons and concurrently RISC to produce highly efficient devices. A doped device based on KCTBC showed EQEmax of 9.0% along with low Efficiency roll-off with long operational device half lifetime of 72 minutes at initial brightness of 1,000 cd m-2, and CIE coordinates of (0.17, 0.13). In addition, with 12.5 wt% of 4CzFCN as assistant dopant/co-host to enhanced the performance of the KCTBC based device with an EQEmax of 13.9% and CIE coordinates of (0.18, 0.13). Further, a high-efficiency warm white OLED adopting the TADF hybrid approach is realized with EQEmax of 9.0 %. |
Description: | Copyright belongs to proceeding publisher |
URI: | http://hdl.handle.net/2080/3702 |
Appears in Collections: | Conference Papers |
Files in This Item:
File | Description | Size | Format | |
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Alam_CIRSI2022.pdf | 1.1 MB | Adobe PDF | View/Open |
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