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Abstract

Here we report a red organic electroluminescent device (OLED) with an emission wavelength at 705 nm in which PCDTBT is used as an emitting layer with the structure ITO/PEDOT:PSS/PCDTBT/BCP/LiF/Al. The device shows good performances such as an onset voltage of 2 V, a maximum brightness of 29000 cd/m2 at 9 V and a maximum current efficiency of 3.5 cd/A. The effects of annealing on the luminescent property of the device are studied at different temperatures. The experimental results suggest that the device presents the best performance at an annealing temperature of 50℃, then the performance decreases with annealing temperature increasing. We find that relatively low temperature annealing is beneficial to the solvent evaporation, and the high temperature annealing is conducible to reducing the coherence length of the π-π stacking, which results in the degradation of the performance of the device.

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Funds:Project supported by the State Key Development Program for Basic Research of China (Grant No. 2010CB327704), the Doctoral Foundation of Ministry of Education, China (Grant Nos. 20130009130001, 20120009130005), the National Natural Science Foundation of China (Grant No. 51272022), the Program for the New Century Excellent Talents in University of Ministry of Education, China (Grant No. NCET-10-0220), and the Fundamental Scientific Research Foundation for the Central Universities of China (Grant No. 2012JBZ001).

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Vol. 63, Issue 16 - 2014-08-20

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