期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 39, 页码 26135-26142出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b07629
关键词
exciplex; delayed fluorescence; phosphor; hybrid WOLED; triplet harvest
资金
- Research Grants Council of the Hong Kong Special Administrative Region, China [CityU 11304115]
Causes of efficiency limitation in common fluorescence and phosphorescence hybrid white organic light-emitting devices (WOLEDs) are discussed, and a new device architecture is proposed to address these issues. This architecture employs a fluorescent emitting layer (EML) of blue exciplex-forming cohost, which shows broad and strong thermally activated delayed fluorescence (TADF). Hybrid WOLEDs, based on this architecture not Only allow complete triplet harvesting for light generation but also can achieve white light emission with high color rending indexes (CRI) using only two colors. By using 26DCzPPy:PO-T2T as the blue fluorescent EMI, and 26DCzPPy:Ir complexes as the phosphorescent EML, we prepared a series of two-color WOLEDs with low turn-on voltages of 2.5-3.3 V, high forward-viewing EQEs of 12.7-19.3% and high CRIs of 67-77. These results suggest this new architecture would be an effective way to achieve high performance WOLEDs with simple structures.
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