A bright single layer non-doped orange-red light emitting diode using a symmetric starburst material via solution process

Abstract

A symmetric starburst orange-red emitter, 2,4,6-tris((E)-2-(10-butyl-10H-phenothiazin-2-yl)vinyl)-1,3,5-triazine (TP3T) incorporating phenothiazine as the electron donor and triazine as the electron acceptor, was synthesized. It shows high fluorescence quantum yield (0.42 in toluene) because of the existence of strong intramolecular charge transfer between the phenothiazine and the triazine moieties. The smaller dipole moment for the molecule resulted from its symmetric starburst conformation and larger alkyl group substituents induce weaker interaction of molecules, thus fluorescence quenching can be effectively reduced. Owing to its bipolar structure, both hole and electron transport could be facilitated. A single layer non-doped stable orange-red emission with CIE coordinates at (0.59, 0.41) and a low turn-on voltage of 2.5 V and a maximum luminance of 2935 cd m À2 was obtained by using TP3T as the single combination layer of charge transporting and emitter via solution process.

A weak electron transporting material with high triplet energy and thermal stability via a super twisted structure for high efficient blue electrophosphorescent devices

“…A glass substrate precoated with an indium tin oxide (ITO) layer was treated as in our previous report. 23 The current density and luminance-voltage characteristics of devices A and B are shown in Fig. 3.…”

Crystal structure analysis of a star-shaped triazine compound: a combination of single-crystal three-dimensional electron diffraction and powder X-ray diffraction

“…should be mentioned here. Such systems serve as materials for twophoton absorption (Cui et al, 2013;Wei et al, 2012;Liu, Zhou et al, 2011;Liu, Huang et al, 2011;Xu et al, 2007;Yin et al, 2005;Cui et al, 2005Cui et al, , 2004, second-and third-order nonlinear optics (NLO) (Cui et al, 2004;He et al, 2013;Diao et al, 2013;Qi et al, 2012;Park & Cho, 2004;Cui et al, 2003;Kong et al, 2010), organic light-emitting diodes (Qu et al, 2007; or liquid crystals (Meier et al, 2003(Meier et al, , 2004(Meier et al, , 2006. 2,4,6-Tris{(E)-2-[4-(dimethylamino)phenyl]ethenyl}-1,3,5triazine (I) can be regarded as a parent compound of such octupolar 1,3,5-triazines.…”