期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 45, 页码 39116-39123出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b17737
关键词
exciplex-forming co-host; high efficiency; low-efficiency roll-off; low operating voltage; multi-EML WOLEDs; exciton confinement; charge balance
资金
- National Natural Science Foundation of China [61575136, 51773141]
- Collaborative Innovation Centre of Suzhou Nano Science and Technology (Nano-CIC)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project of The State Administration of Foreign Experts Affairs of China
- Yunnan Provincial Research Funds on College -Enterprise Collaboration [20151E016]
It is a challenge to engineer white organic light-emitting diodes (WOLEDs) with high efficiency, low operating voltage, good color quality, and low efficiency roll-off, simultaneously. Herein, we employ a novel exciplex to solve this problem, which mixes a bipolar host material 2,6-bis(3-(carbazol-9-yl)phenyl)pyridine (26D CzPPy) with a common electron-transporting material 4,6-bis[3,5-(dipyrid-4-yl)phenyl]-2-methylpyrimidine (B4PyMPM) to form the host for a blue emitter iridium(III)bis(4,6-(difluorophenyl)pyridinato-N,C-2') picolinate (FIrpic). The blue OLED with maximum power efficiency (PE) over 48 lm W-1 and Commission International de I'Eclairage chromaticity diagram (0.17, 0.36) was achieved. To obtain white light emission, a complementary orange emission layer is used, which consists of the bis(4-phenylth-ieno[3,2-c]pyridine)(acetylacetonate)iridium(III) (PO-01) doped into the single host of 26DCzPPy adjacent to the blue emission layer. Benefiting from the exciplex and effective utilization of the excitons by using the optimized multifunctional device structure, the WOLEDs remarkably exhibit maximum external quantum efficiency, PE, and current efficiency of 28.5%, 95.5 lm W-1, and 82.0 cd A(-1), respectively. At the luminance of 100 cd m(-2), it maintains the values of 27.2%, 90.2 lm W-1, and 78.4 cd A(-1), respectively. Furthermore, the WOLEDs have a low threshold voltage of about 2.6 V and remain around 4.0 Vat 10 000 cd m(-2). These results indicate that the exciplex-forming co-host 26DCzPPy:B4PyMPM can provide an effective strategy to fabricate high-efficiency WOLEDs for potential applications.
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