Citation: PENG Xue-Feng, LEI Yong, LIU Zhen, JI Xia-Xia, FAN Chang-Jun, YANG Xiao-Hui. Sensitized, Thermally Activated, Delayed Fluorescence Devices Based on a Polymer Host Material[J]. Acta Physico-Chimica Sinica, ;2016, 32(9): 2369-2376. doi: 10.3866/PKU.WHXB201606031 shu

Sensitized, Thermally Activated, Delayed Fluorescence Devices Based on a Polymer Host Material

School of Physical Science and Technology, Southwest University, Chongqing 400715, P. R. China

Received Date: 7 March 2016
Revised Date: 3 June 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (61177030, 11474232).

Polymer light emitting devices incorporating poly(9-vinylcarbazole) (PVK):2,2'-(1,3-phenylene)-bis [5-(4-tert-butylphenyl)-1,3,4-oxadiazole] (OXD-7) as the co-host and the thermally activated delayed fluorescence compound 2,4,5,6-tetrakis(carbazol-9-yl)-1,3-dicyanobenzene (4CzIPN) as the emissive dopant exhibited a peak external quantum efficiency of 13%. In addition, 4CzIPN-sensitized (5,6,11,12)-tetraphenyl-naphthacene (Rubrene) devices gave a peak external quantum efficiency of 9.2%, a value that is 5.4 times that of analogous devices without 4CzIPN. Based on transient luminescence measurements, the working mechanism for 4CzIPN sensitization was determined to be Förster energy transfer from 4CzIPN to Rubrene. This work assessed the effects of the Rubrene concentration and the carrier transport balance in the emission layer on the device properties, and the results suggest that the self-aggregation of Rubrene may limit device efficiency.
- Polymer light-emitting device,
- Thermally activated delayed fluorescence,
- Sensitizer,
- Förster energy transfer
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