Synthesis, characterization and high-efficiency blue electroluminescence based on coumarin derivatives of 7-diethylamino-coumarin-3-carboxamide
✍ Scribed by Tianzhi Yu; Peng Zhang; Yuling Zhao; Hui Zhang; Jing Meng; Duowang Fan
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 992 KB
- Volume
- 10
- Category
- Article
- ISSN
- 1566-1199
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✦ Synopsis
A novel tripodal compound, tris [2-(7-diethylamino-coumarin-3-carboxamide)ethyl]amine (tren-C), and a model compound, N-butyl-7-(diethylamino)-coumarin-3-carboxamide, were synthesized and characterized by elemental analysis, infrared and 1 H NMR spectra. The structure of the model compound was characterized by single crystal X-ray crystallography. The electroluminescence devices of ITO/2-TNATA (5 nm)/NPB (40 nm)/CBP: tren-C or model compound (wt%, 30 nm)/Bu-PBD (30 nm)/LiF (1 nm)/Al (100 nm) were fabricated and characterized. The EL spectra of the devices comprising vacuum vapour-deposited films using tren-C as a dopant are similar to the PL spectrum of tren-C in chloroform solutions. At the concentration of 0.5 wt% tren-C, a blue-emitting OLED with an emission peak at 464 nm, a maximum external quantum efficiency (EQE) of 1.39% and a maximum luminous efficiency of 2 cd/A at the current density of 20 mA/cm 2 , and a maximum luminance of 1450 cd/m 2 at 12 V are achieved.