期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 39, 页码 33360-33372出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b11136
关键词
thermally activated delayed fluorescence; organic light emitting diodes; oxadiazoles; blue emitters; DFT calculations
资金
- University of St Andrews
- EPSRC [EP/P010482/1, EP/J01771X, EP/J00916]
- Royal Society Wolfson Research Merit Award
- European Commission through a Marie Sklodowska Curie Individual Fellowship [703387]
- European Commission through a Marie Sklodowska Individual Fellowship [799302]
- EPSRC [EP/J01771X/1] Funding Source: UKRI
A series of four novel deep-blue to sky-blue thermally activated delayed fluorescence (TADF) emitters (2CzdOXDMe, 2CzdOXD4MeOPh, 2CzdOXDPh, and 2CzdOXD4CF(3)Ph) have been synthesized and characterized. These oxadiazole-based emitters demonstrated bluer emission compared with the reference emitter 2CzPN thanks to the weaker acceptor strength of the oxadiazole moieties. The oxadiazole compounds doped in hosts (mCP and PPT) emitted from 435 to 474 nm with photoluminescence quantum yields ranging from 14-55%. The emitters possess singlet triplet excited-state energy gaps (Delta E-ST) between 0.25 and 0.46 eV resulting in delayed components ranging from 4.8 to 25.8 ms. The OLED device with 2CzdOXD4CF(3)Ph shows a maximum external quantum efficiency of 11.2% with a sky-blue emission at CIE of (0.17, 0.25), while the device with 2CzdOXD4MeOPh shows a maximum external quantum efficiency of 6.6% with a deep-blue emission at CIE of (0.15, 0.11).
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