Journal
CHEMICAL ENGINEERING JOURNAL
Volume 434, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.134728
Keywords
Thermally activated delayed fluorescence; Organic light-emitting diodes; High efficiency; Long lifetime; Dual acceptor
Categories
Funding
- National Natural Science Foundation of China [21772209]
- National Program for Support of Top-notch Young Professionals
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In this study, four dual-acceptor typed thermally activated delayed fluorescence (TADF) emitters were designed and showed outstanding performance on the devices, with DTXO-TPA2 exhibiting the highest external quantum efficiency and power efficiency. The devices based on DTXO-TPA2 also demonstrated high lifetime and color rendering index.
The efficiency and lifetime are critical to the development of high-quality organic light-emitting diodes (OLEDs). Herein, four dual-acceptor typed thermally activated delayed fluorescence (TADF) emitters (DTXO-PhCz2, DTXO-PhCz4, DTXO-TPA2 and DTXO-TPA4) with emission from yellow to red were designed by taking triphenylamine or N-phenylcarbazole as the donor and 9-H-thioxanthen-9-one-10,10-dioxide (TXO) as the acceptor. All of the devices based on these emitters showed outstanding performance. Particularly, depending on superior electronic properties, DTXO-TPA2 showed the maximum photoluminescence quantum yield (PLQY) and horizontally oriented emitting dipole. As a result, the orange-red OLED based on DTXO-TPA2 achieve maximum external quantum efficiency (EQE) of 24.98% and power efficiency (PE) of 77.74 lm W-1. And, thanks to the stable molecular framework and favorable device characteristics, the lifetime value of DTXO-TPA2-based device can reach up to 1392 h at 50% of the initial luminescence of 1000 cd m(- 2). Furthermore, the white OLED based on DTXO-TPA2 can achieve high EQE of 17.96% and color rendering index of 85 with CIE of (0.31,0.31). This work supports an effective design strategy about increasing TXO acceptor moieties for the orange-red TADF materials to develop highly efficient and long-lived OLEDs.
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