TY - JOUR
T1 - Strong luminescence behavior of mono- and dimeric imidazoquinazolines
T2 - Swift OLED degradation under electrical current
AU - Pandey, Rampal
AU - Méhes, Gábor
AU - Kumar, Ashish
AU - Singh, Roop Shikha
AU - Kumar, Amit
AU - Adachi, Chihaya
AU - Pandey, Daya Shankar
N1 - Funding Information:
Authors acknowledge the Department of Science and Technology (DST), New Delhi, India for providing financial assistance through the scheme SR/S1/IC/-25/2011 (DSP) and DST Inspire Faculty Scheme (IFA12-CH-66) to RP. This research is supported by the Cabinet Office, Government of Japan and the Japan Society for the Promotion of Science (JSPS) through the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program). The authors thank Dr. K. Goushi for helpful suggestions and discussions.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - Design and synthesis of novel mono- and dimeric quinazoline derivatives (+)-6-methyl-6-pyridin-2-yl-5,6-dihydrobenzo[4,5]imidazo[1,2-c]quinazoline (1) and (+)-6-[(6-methyl-5,6-dihydrobenzo-[4,5]imidazo[1,2-c]quinazolin-6-yl)-pyridin-2-yl]-6-methyl-5,6-dihydro-benzo-[4,5]imidazo-[1,2-c]quinazoline (2) have been described. Both 1 and 2 have been characterized by elemental analyses, FT-IR, 1H and 13C NMR, HRMS spectroscopic studies and their structures authenticated by X-ray single crystal analyses. Photophysical properties of these compounds have been studied by UV/VIS absorption and fluorescence spectroscopy and transient photoluminescence analysis in solution, powder, and non-doped (neat) and doped vacuum-deposited films. A broad emission spectrum spanning most of the visible range and good thermal stability indicated promising application of 1 and 2 as OLED emitters. Unfortunately, under current flow we observed rapid device degradation, presumably to be related to free –NH moiety in these compounds.
AB - Design and synthesis of novel mono- and dimeric quinazoline derivatives (+)-6-methyl-6-pyridin-2-yl-5,6-dihydrobenzo[4,5]imidazo[1,2-c]quinazoline (1) and (+)-6-[(6-methyl-5,6-dihydrobenzo-[4,5]imidazo[1,2-c]quinazolin-6-yl)-pyridin-2-yl]-6-methyl-5,6-dihydro-benzo-[4,5]imidazo-[1,2-c]quinazoline (2) have been described. Both 1 and 2 have been characterized by elemental analyses, FT-IR, 1H and 13C NMR, HRMS spectroscopic studies and their structures authenticated by X-ray single crystal analyses. Photophysical properties of these compounds have been studied by UV/VIS absorption and fluorescence spectroscopy and transient photoluminescence analysis in solution, powder, and non-doped (neat) and doped vacuum-deposited films. A broad emission spectrum spanning most of the visible range and good thermal stability indicated promising application of 1 and 2 as OLED emitters. Unfortunately, under current flow we observed rapid device degradation, presumably to be related to free –NH moiety in these compounds.
KW - Crystal structure
KW - Density functional theory
KW - Excimer/ICT state formation
KW - Imidazo-quinazoline
KW - OLED degradation
KW - Photoluminescence
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U2 - 10.1016/j.jlumin.2016.09.026
DO - 10.1016/j.jlumin.2016.09.026
M3 - Article
AN - SCOPUS:84988644327
SN - 0022-2313
VL - 181
SP - 252
EP - 260
JO - Journal of Luminescence
JF - Journal of Luminescence
ER -