Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (9): 2369-2376.doi: 10.3866/PKU.WHXB201606031

• ARTICLE • Previous Articles     Next Articles

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

Xue-Feng PENG,Yong LEI,Zhen LIU,Xia-Xia JI,Chang-Jun FAN,Xiao-Hui YANG*()   

  • Received:2016-03-07 Published:2016-09-08
  • Contact: Xiao-Hui YANG E-mail:xhyang@swu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(61177030);the National Natural Science Foundation of China(11474232)

Abstract:

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 F?rster 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.

Key words: Polymer light-emitting device, Thermally activated delayed fluorescence, Sensitizer, F?rster energy transfer

MSC2000: 

  • O649