期刊
CHEMISTRY OF MATERIALS
卷 29, 期 20, 页码 8630-8636出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.7b02403
关键词
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资金
- National Key R&D Program of China [2016YFB0401004]
- National Natural Science Foundation of China [51625301, 51573059, 91233116]
- 973 Project [2015CB655003]
- Guangdong Provincial Department of Science and Technology [2016B090906003]
- Japan Science and Technology Agency (JST) via Center of Innovation (COI)
- JSPS KAKENHI from JSPS [17H03131]
- Grants-in-Aid for Scientific Research [17H03131] Funding Source: KAKEN
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.
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