A series of blue‐emissive 7‐(diphenylamino)‐4‐phenoxycoumarin derivatives bearing ‐CF3, ‐OMe, or ‐N(Me)2 substituents on the phenoxy subunit were synthesized. Although both the ‐CF3 and ‐N(Me)2 modifications were found to trigger redshifted fluorescence, the ‐OMe substitution was demonstrated to exert an unexpected blueshift color‐tuning effect toward the deep‐blue region. The reason is that the moderate electron‐donating ‐OMe group can endow coumarins with unaltered HOMO but elevated LUMO energy levels. Moreover, the ‐OMe substitution was found to be beneficial to the thermal stability of these coumarins. Therefore, the trimethoxy‐substituted objective compound can act as a high‐performance deep‐blue organic light‐emitting diode (OLED) emitter, and OLED based on it emits deep‐blue light with CIE coordinates of (0.148, 0.084), maximum luminance of 7800 cd m−2, and maximum external quantum efficiency of 5.1 %. These results not only shed light on the molecular design strategy for high‐performance deep‐blue OLED emitters through color‐tuning, but also show the perspective of coumarin derivatives as deep‐blue OLED emitters.
Chemistry - A European Journal – Wiley
Published: Jan 7, 2018
Keywords: ; ; ; ;
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera