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- Title
A Facile Approach to Highly Efficient and Thermally Stable Solid-State Emitters: Knitting up AIE-Active TPE Luminogens by Aryl Linkers.
- Authors
Chan, Carrie Yin Kwan; Lam, Jacky Wing Yip; Zhao, Zujin; Deng, Chunmei; Chen, Shuming; Lu, Ping; Sung, Herman H. Y.; Kwok, Hoi Sing; Ma, Yuguang; Williams, Ian D.; Tang, Ben Zhong
- Abstract
A facile approach to thermally stable and efficient solid-state emitters is proposed. By hooking up tetraphenylethene (TPE) units through aryl linkers under Suzuki coupling conditions, a series of arylene bis(tetraphenylethene)s (TPE-Ar-TPE Ar=2,5-dimethyl-1,4-phenylene, 2,5-bis(hexyloxyl)-1,4-phenylene, 1,5-naphthylene, and 9,10-anthracenylene) are prepared in satisfactory to high yields (67-96 %). These molecules are nonluminescent when dissolved in solutions but become highly emissive when aggregated in poor solvents or fabricated as thin film in the solid state, displaying a phenomenon of aggregation-induced emission. Fluorescence quantum yields of 100 % were achieved in the amorphous films of the luminogens. The luminogens exhibit mechano-, vapo-, and thermochromism: their emissions can be repeatedly switched between blue and blue-green colors by simple grinding-fuming and grinding-heating cycles owing to the morphological change from a crystalline to an amorphous state and vice versa. These compounds are thermally stable, losing little of their weight at high temperatures of 421-452 °C. All the luminogens are morphological stable with high glass transition temperatures. Multilayer light-emitting diodes with a device configuration of ITO/NPB/dye/TPBi/Alq3/LiF/Al are fabricated, which emit sky-blue electroluminescence with maximum luminance and external quantum efficiency of 7900 cd m−2 and 2.1 %, respectively.
- Subjects
THERMAL analysis; SOLID state chemistry; COUPLING reactions (Chemistry); PHENYL compounds; THERMOCHROMISM; ORGANIC electronics; LIGHT emitting diodes; ELECTROLUMINESCENCE; CLUSTERING of particles
- Publication
ChemPlusChem, 2012, Vol 77, Issue 10, p949
- ISSN
2192-6506
- Publication type
Article
- DOI
10.1002/cplu.201200202