Horizontally Orientated Sticklike Emitters: Enhancement of Intrinsic Out-Coupling Factor and Electroluminescence Performance

Highly efficient organic light-emitting diodes are in urgent demand in applications of new generation full-color displays and solid-state lighting sources. The limitation of device performance is greatly affected by extrinsic and intrinsic elements of the light out-coupling process. By elaborately d...

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Published in:Chemistry of materials 2017-10, Vol.29 (20), p.8630-8636
Main Authors: Liu, Ming, Komatsu, Ryutaro, Cai, Xinyi, Hotta, Katsuyuki, Sato, Shugo, Liu, Kunkun, Chen, Dongcheng, Kato, Yuki, Sasabe, Hisahiro, Ohisa, Satoru, Suzuri, Yoshiyuki, Yokoyama, Daisuke, Su, Shi-Jian, Kido, Junji
Format: Article
Language:English
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Summary:Highly efficient organic light-emitting diodes are in urgent demand in applications of new generation full-color displays and solid-state lighting sources. The limitation of device performance is greatly affected by extrinsic and intrinsic elements of the light out-coupling process. By elaborately designing emitters as sticklike molecules, horizontal orientation ratios in the range of 86–93% were realized to intrinsically increase the out-coupling factor of electroluminescence devices. These elongated compounds are inclined to lie parallel to substrate in vacuum-deposited thin solid films and regularize their transition dipole moments in a major degree. As consequences of such desirable molecule arrangement, remarkable external quantum efficiencies near 21% for pure blue devices, close to 30% for sky-blue devices, and over 35% for greenish blue devices were respectively achieved. A compatible strategy on devising high-performance emitters for organic electroluminescence is advocated herein.
ISSN:0897-4756
1520-5002
DOI:10.1021/acs.chemmater.7b02403