- Tert-Butylated spirofluorene derivatives with arylamine groups for highly efficient blue organic light emitting diodes
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A series of tert-butylated spirofluorene derivatives incorporating a diphenylaminoaryl-vinyl group was synthesized via the Horner-Wadsworth-Emmons olefination and a Suzuki cross-coupling reaction. To examine the electroluminescent properties of these materials, multilayered OLEDs were fabricated into the following device structure: ITO/DNTPD/NPB/MADN:blue dopant materials 1-14/Alq3/Liq/Al. All devices showed efficient blue emission. In particular, one device exhibited highly efficient sky blue emission with a maximum luminance of 25100 cd m-2 at 8.5 V, as well as luminous, power and external quantum efficiencies of 9.5 cd A-1, 5.1 lm W-1 and 6.7% at 20 mA cm-2, respectively. The peak wavelength of electroluminescence was 458 and 484 nm with CIEx,y coordinates of (0.14, 0.21) at 8.0 V. In addition, a deep blue device with CIEx,y coordinates of (0.15, 0.15) at 8.0 V showed a luminous efficiency and external quantum efficiency of 3.8 cd A-1 and 3.3% at 20 mA cm-2, respectively.
- Lee, Jun Yeob,Lee, Kum Hee,Kim, Seul Ong,You, Jae Nam,Kang, Sunwoo,Lee, Jin Yong,Yook, Kyoung Soo,Jeon, Soon Ok,Yoon, Seung Soo
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p. 5145 - 5154
(2012/06/18)
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