Photorefractive triphenylamine-based glass: a multifunctional low molecular weight compound with fast holographic response
作者:C. Hohle、U. Hofmann、S. Schloter、M. Thelakkat、P. Strohriegl、D. Haarer、S. J. Zilker
DOI:10.1039/a902562f
日期:——
A novel organic photorefractive composite system is presented consisting of the amorphous multifunctional low-molar mass compound DR1-DCTA, doped with C
60
as sensitizer and diisooctyl phthalate (DOP) as plasticizer. DR1-DCTA, a carbazole substituted triphenylamine with a covalently attached nonlinear optical azo chromophore unit has been synthesized in a 4 step reaction. The compound forms a stable glass. Its thermal, optical and electrochemical properties are discussed. Holographic experiments (2BC, DFWM) of the photorefractive composite exhibit a fast response time in the range of only 30 ms and a maximum gain coefficient of 90 cm
–1
.
Dendron engineering in self-host blue iridium dendrimers towards low-voltage-driving and power-efficient nondoped electrophosphorescent devices
作者:Yang Wang、Shumeng Wang、Junqiao Ding、Lixiang Wang、Xiabin Jing、Fosong Wang
DOI:10.1039/c6cc08722a
日期:——
Low-voltage-driving and power-efficient nondoped electrophosphorescent devices have been realized by increasing the dendron's HOMO energy level to favor effective hole injection and promote exciton formation.
通过提高树枝状化合物的 HOMO 能级,有利于有效注入空穴并促进激子的形成,实现了低电压驱动和高能效的非掺杂电磷光器件。
Efficient Synthesis of a Multifunctional
Dye Conjugate for Photorefractive Applications
An efficient method for the synthesis of a multifunctional dye conjugate containing an electrooptical merocyanine chromophore and a photoconducting triphenylamine electrophore is described. In the first step 4,4′-di(9-carbazolyl)-substituted 4′′-hydroxytriphenylamine 7 is reacted with 2,3-dihydro-5H-oxazolo[3,2-a]pyrid-5-one (6) by dihydrooxazole ring opening leading to precursor 8 which could be converted to the bichromophoric conjugate 2 in a Knoevenagel condensation. UV/VIS spectroscopy and cyclic voltammetry of the bichromophoric compound 2 revealed optical and electrical properties that make such multifunctional dye conjugates highly promising for photorefractive applications.