Solution-processed multilayer small-molecule light-emitting devices with high-efficiency white-light emission

Naoya Aizawa, Yong-Jin Pu (), Michitake Watanabe, Takayuki Chiba, Kazushige Ideta, Naoki Toyota, Masahiro Igarashi, Yoshiyuki Suzuri, Hisahiro Sasabe and Junji Kido ()
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Naoya Aizawa: Research Center for Organic Electronics, Yamagata University
Yong-Jin Pu: Research Center for Organic Electronics, Yamagata University
Michitake Watanabe: Research Center for Organic Electronics, Yamagata University
Takayuki Chiba: Research Center for Organic Electronics, Yamagata University
Kazushige Ideta: Research Center for Organic Electronics, Yamagata University
Naoki Toyota: Research Center for Organic Electronics, Yamagata University
Masahiro Igarashi: Research Center for Organic Electronics, Yamagata University
Yoshiyuki Suzuri: Research Center for Organic Electronics, Yamagata University
Hisahiro Sasabe: Research Center for Organic Electronics, Yamagata University
Junji Kido: Research Center for Organic Electronics, Yamagata University

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Recent developments in the field of π-conjugated polymers have led to considerable improvements in the performance of solution-processed organic light-emitting devices (OLEDs). However, further improving efficiency is still required to compete with other traditional light sources. Here we demonstrate efficient solution-processed multilayer OLEDs using small molecules. On the basis of estimates from a solvent resistance test of small host molecules, we demonstrate that covalent dimerization or trimerization instead of polymerization can afford conventional small host molecules sufficient resistance to alcohols used for processing upper layers. This allows us to construct multilayer OLEDs through subsequent solution-processing steps, achieving record-high power efficiencies of 36, 52 and 34 lm W−1 at 100 cd m−2 for solution-processed blue, green and white OLEDs, respectively, with stable electroluminescence spectra under varying current density. We also show that the composition at the resulting interface of solution-processed layers is a critical factor in determining device performance.

Date: 2014
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DOI: 10.1038/ncomms6756

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