tert-Butylated spirofluorene derivatives with arylamine groups for highly efficient blue organic light emitting diodes
作者:Kum Hee Lee、Seul Ong Kim、Jae Nam You、Sunwoo Kang、Jin Yong Lee、Kyoung Soo Yook、Soon Ok Jeon、Jun Yeob Lee、Seung Soo Yoon
DOI:10.1039/c2jm14869b
日期:——
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 25 100 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.
通过 Horner-Wadsworth-Emmons 烯化反应和铃木交叉偶联反应,合成了一系列含有二苯基氨基芳基乙烯基的叔丁基化螺芴衍生物。为了研究这些材料的电致发光特性,将多层有机发光二极管制成了以下器件结构:ITO/DNTPD/NPB/MADN:蓝色掺杂材料 1-14/Alq3/Liq/Al。所有器件都显示出高效的蓝色发射。其中,一个器件显示出高效的天蓝色发射,在 8.5 V 时的最大亮度为 25 100 cd m-2,在 20 mA cm-2 时的发光效率、功率效率和外部量子效率分别为 9.5 cd A-1、5.1 lm W-1 和 6.7%。电致发光的峰值波长为 458 和 484 nm,8.0 V 时的 CIEx,y 坐标为 (0.14, 0.21)。此外,深蓝色器件的 CIEx,y 坐标为 (0.15, 0.15),8.0 V 时的发光效率和外部量子效率分别为 3.8 cd A-1 和 3.3%(20 mA cm-2)。