Donor−Acceptor 9-Uncapped Fluorenes and Fluorenones as Stable Blue Light Emitters<sup>,</sup>
作者:Atul Goel、Sumit Chaurasia、Manish Dixit、Vijay Kumar、Sattey Prakash、Bijayalaxmi Jena、Jai K. Verma、Mayank Jain、R. S. Anand、S. Sundar Manoharan
DOI:10.1021/ol9000679
日期:2009.3.19
The "green emission defect" (GED) produced by fluorenones has significantly retarded the commercial scope of fluorene-based B-OLEDs. In this paper, for the first time, it is demonstrated that the "green light" emitting fluorenones 7 can be converted to "blue light" emitting fluorenones 10 by appropriate positioning of donor-acceptor and chromophoric groups onto the fluorene/fluorenone backbone. Additionally, we report an elegant highly rapid synthetic route for donor-acceptor fluorenes and fluorenones at room temperature with excellent yields.
Synthesis, Electrochemical and Optical Properties of Stable Yellow Fluorescent Fluoranthenes
作者:Atul Goel、Vijay Kumar、Sumit Chaurasia、Madhu Rawat、Ramesh Prasad、R. S. Anand
DOI:10.1021/jo100420x
日期:2010.6.4
A novel series of thermally stable yellow light emitting fluoranthenes with an amine donor and a nitrite acceptor was prepared from a ketene-S,S-acetal under mild conditions without using an organometal catalyst. The organic light emitting device of yellow fluoranthene 10b exhibited substantially low turn-on voltage (2.6 V) and maximum brightness of 470 Cd/m(2) with luminance efficiency of 2.0 Cd/A without using any dopant.
Thermally Stable Nonaggregating Pyrenylarenes for Blue Organic Light-Emitting DevicesCDRI communication No. 8097.
作者:Atul Goel、Vijay Kumar、Pankaj Nag、Vikas Bajpai、Brijesh Kumar、Charan Singh、Sattey Prakash、R. S. Anand
DOI:10.1021/jo2011768
日期:2011.9.16
A new series of thermally stable blue light-emitting nonplanar pyrenylarenes having an amine donor and a nitrile acceptor group was prepared from a ketene-S,S-acetal under conventional heating and/or microwave irradiation. The photophysical, electrochemical, and optical behavior of donor acceptor pyrenylarenes are demonstrated. The performance of blue light-emitting pyrenylarenes was investigated by fabricating a multilayer device with the device configuration of ITO/PEDOT:PSS (40 nm)/NPB (30 nm)/pyrenylarene (55 nm)/BCP (8 nm)/LiF (0.6 nm)/Al (200 nm), which exhibited low turn-on voltage (5 V) with luminance efficiency of 0.8 Cd/A with nonaggregation behavior in both solution and solid state.