1365480-03-0Relevant articles and documents
Tert-Butylated spirofluorene derivatives with arylamine groups for highly efficient blue organic light emitting diodes
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
, p. 5145 - 5154 (2012/06/18)
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.