期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 32, 页码 20955-20961出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b07563
关键词
nondoped; quantum-well structure; TXO-PhCz; thermally activated delayed fluorescence; organic light emitting diodes
资金
- National Natural Science Foundation of China [61420106002, 51373189, 61178061, 61227008]
- Chinese Academy of Sciences
- National Basic Research Program of China (973) [2014CB932600]
- Start-Up Fund of the Technical Institute of Physics and Chemistry, the Chinese Academy of Sciences
Highly efficiency nondoped thermally activated delayed fluorescence (TADF) organic light emitting diodes (OLEDs) with multiquantum wells structure were demonstrated. By using an emitting layer with seven quantum wells, the nondoped TADF OLEDs exhibit high efficiency with EQE of 22.6%, a current efficiency of 69 cd/A, and a power efficiency of SO lm/W, which are higher than those of the conventional doped OLED and among the best of the TADF OLEDs. The high performance of the devices can be ascribed to effective confinement of the charges and excitons in the emission layer by the quantum well structure. The emission layer with multiquantum well structure is demonstrated to be cost effective for highly efficient nondoped TADF OLEDs and holds great potential for organic electronics.
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