Date：2017-08-11 |
Views：1812 |
【Academic writing Sharing 20170811】 |
New Molecular Design Concurrently Providing Superior Pure Blue Thermally Activated Delayed Fluorescent and Optical Outcoupling Efficiencies
Article excerpt is from: P. Rajamalli, N. Senthilkumar, P.-Y Huang, C.-C. Ren-Wu, H.-W. Lin and C.-H. Cheng
JACS, in press, 2017
2DPyM-mDTC and 3DPyM-pDTC containing a central keto group, two pyridine rings and two di(tbutyl) carbazolyl units. The connection of the three functional groups is the key for the PL and EL properties of these two isomers. 3DPyM-pDTC with a nearly planar structure shows a high Θ of 85%, very high PLQY of 98%, and EQE of 31% compared to those of 2DPyM-mDTC with a more flexible structure. In addition,
3DPyM-pDTC shows a narrow-band true blue emission with a FWHM of 62 nm and CIE of (0.14, 0.18) suitable blue emitter for practical application. These results prove that increased restriction of the molecular structure could be an effective method to enhance the outcoupling efficiency, EQE, color purity, and reduced roll-off of the TADF devices.
