Journal of Materials Chemistry p. 3030 - 3036 (2007)
Update date:2022-08-05
Topics:
Cirpan, Ali
Rathnayake, Hemali P.
Lahti, Paul M.
Karasz, Frank E.
2,7-Bis(1′-pyrenylvinylene)-9,9-diethylfluorene (1) and 2,7-bis(1′-pyrenylvinylene-4″-phenylenevinylene)-9, 9-diethylfluorene (2) were synthesized and their static luminescence behavior assessed. They show solution photoluminescence (PL) maxima in chloroform at 475 nm and 467 nm, with quantum efficiencies of 54% and 52%, respectively. Double-layer LED devices with configuration ITO/PEDOT-PSS/(1 or 2)/Ca-Al emitted blue-green light with turn-on voltages of 2.5 V and emission maxima at 500 nm (2.48 eV); their luminance efficiencies were 0.36 and 0.30 cd A-1, respectively. Blending of 1 at 20% (w/w) in PVK improved the luminance efficiency to 1.81 cd A-1 for the same device configuration, with only a small increase in turn-on voltage to 3 V; the emission maximum was 497 nm (blue-green emission), the maximum luminance 7600 cd m-2 with CIE color coefficients of (0.12, 0.45). For a 10% (w/w) blend of 2 in PVK using the same device configuration, the luminance efficiency was 1.47 cd A-1, turn-on voltage 3 V, maximum luminance 2600 cd m-2 with CIE coefficients of (0.13, 0.45). Simple π-MO calculations show that structural extension of the nominal conjugation length in 2 does not significantly decrease the effective band gap relative to 1, consistent with the observed lack of red shift in 2. The Royal Society of Chemistry.
View MoreContact:--
Address:80G, No.1 Building, Guodu Development Mansion, No. 182 Zhaohui Road, Hangzhou City, Zhejiang Province,China.
Hubei Honch Pharmaceutical Co.,Ltd
Contact:86-713-7222018
Address:Li Shizhen Pharmaceutical Industry park, Qichun County, Hubei Province,China
Shangyu Sanhechemicals Co.,LTD.
Contact:86-0571-56696839
Address:Num.2952,Nanhuan Road,Binjiang District,Hangzhou,China
website:http://www.apeptides.com/en/
Contact:+86-21-60871011
Address:No. 80 Chuanshan Shuyuan Steet,Pudong,Shanghai
website:http://www.tbbmed.com
Contact:86--21-50498136
Address:Room 6002, Building 7-1, No.160 Basheng Road,Pudong Area,Shanghai China
Doi:10.1016/S0040-4039(00)78758-2
(1980)Doi:10.1016/S0008-6215(00)84673-X
(1980)Doi:10.1021/jo00956a023
(1973)Doi:10.1021/ma300483u
(2012)Doi:10.1055/s-2004-830890
(2004)Doi:10.1021/ic00131a029
(1982)