期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 50, 页码 43842-43849出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b16199
关键词
thermally activated delayed fluorescence; organic light-emitting diodes; light outcoupling factor; molecular orientation; transition dipole moment
资金
- Ministry of Science and Technology [MOST 103-2113-M-001-021-MY3]
- JST ERATO [JPMJER1305]
- iMATE Program of Academia Sinica
- National Taiwan University
The inclusion of a tetraphenylbenzene (4Ph) unit in thermally activated delayed fluorescence emitters is demonstrated as a novel strategy for greatly enhancing the horizontally oriented alignment of the emitters without shifting the emission spectrum to longer wavelengths. Doping of blue-emitting 4PhOXDDMAC or greenish blue-emitting 4PhOXDPXZ into o-DiCbzBz host layers yielded much higher degrees of horizontally oriented alignment for the emitter (up to 92%) compared to those when the 4Ph unit was excluded (69 and 75%, respectively). The enhanced alignment results in high outcoupling efficiencies of 24 and 35% in organic light-emitting diodes based on 4PhOXDDMAC and 4PhOXDPXZ, respectively, and boosts the external quantum efficiencies to values (8.8 and 29.2%, respectively) that are higher than what would be expected for randomly oriented emitters (outcoupling efficiency of 20%). These enhancements are achieved while avoiding the redshift that often occurs using the common strategy of increasing molecular length and, thereby, conjugation, to increase orientation.
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