Oligofluorene-based push-pull type functional materials for blue light-emitting diodes

doi:10.1016/j.jphotochem.2011.12.008

CORC > 化学研究所 > 中国科学院化学研究所

	Oligofluorene-based push-pull type functional materials for blue light-emitting diodes
	Lin, Ying 1,2; Chen, Yu 1; Ye, Teng-Ling 3; Chen, Zhi-Kuan 2; Dai, Yan-Feng 3; Ma, Dong-Ge 3
刊名	JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
	2012-02-15
卷号	230 期号:1 页码:55-64
关键词	Oligofluorene Oled Cyanophenyl Carbazole Push-pull Type Functional Materials
ISSN号	1010-6030
DOI	10.1016/j.jphotochem.2011.12.008
英文摘要	A series of new oligofluorene-based push-pull type blue light-emitting functional materials, namely, 2-(9H-carbazole-9-yl)-7-(4-cyanophenyl)-9,9-dihexylfluorene (F1), 7-(9H-carbazol-9-yl)-7'-(4-cyanophenyl)-2,2'-bi(9,9-dihexylfluorene) (F2), 7-(9H-carbazole-9-yl)-7 ''-(4-cyanophenyl)-2,2':7',2 ''-ter(9,9-dihexylfluorene) (F3), and 7-(9H-carbazole-9-yl)-7'''-(4-cyanophenyl)-2,2':7',2 '':7 '',2'''-quarter(9,9-dihexylfluorene) (F4) were synthesized and characterized. Their onset decomposition temperatures for the thermal bond cleavage and the glass-transition temperatures were in general increased with increasing number of fluorene units. In dilute toluene solution, the oligofluorenes exhibited main absorption peaks in the range of 343-370 nm, photoluminescence maxima from 403 to 410 nm, and absolute quantum yields (Phi(PL)s) of higher than 87%. In contrast, the absorption spectra of these compounds in the thin films had no large differences from those in the solutions except for the slight peak red-shifts (2-8 nm). The main emission maxima of F1, F2, and F3 in the thin films were located at 418-420 nm, while the main emission of F4 was found to be shifted to 446 nm, followed by a shoulder peak at 421 nm. The Phi(PL)s of these thin films were estimated in the range of 59.2-68.7%. The existence of the electron-pull and -push end groups could effectively tune the energy levels of the oligofluorenes. By using the organic light emitting device (OLED) configuration of ITO/PEDOT:PSS/oligofluorenes/TPBi/LiF/Al by solution-process, F4 displayed the best performance: the lowest turn-on voltage (4.1 V) and highest maximum luminance (2180 cd/m(2)) with maximal current efficiency of 1.17 cd/A. When F4 was fabricated into the optimized device of ITO/MoO3/NPB/CBP:F4(1:4)/TPBi/Li F/Al by vapor deposition, highest brightness of 5135 cd/m(2) and current efficiency of 1.76 cd/A were achieved with the Commission Internationale de l'Eclairage (CIE) coordinates of (0.16, 0.09). (C) 2011 Elsevier B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000301316800008
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/48171]
专题	中国科学院化学研究所
通讯作者	Chen, Yu
作者单位	1.E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Inst Appl Chem, Shanghai 200237, Peoples R China 2.Inst Mat Res & Engn, Singapore 117602, Singapore 3.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Grad Sch, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Lin, Ying,Chen, Yu,Ye, Teng-Ling,et al. Oligofluorene-based push-pull type functional materials for blue light-emitting diodes[J]. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,2012,230(1):55-64.
APA	Lin, Ying,Chen, Yu,Ye, Teng-Ling,Chen, Zhi-Kuan,Dai, Yan-Feng,&Ma, Dong-Ge.(2012).Oligofluorene-based push-pull type functional materials for blue light-emitting diodes.JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,230(1),55-64.
MLA	Lin, Ying,et al."Oligofluorene-based push-pull type functional materials for blue light-emitting diodes".JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 230.1(2012):55-64.