Synthesis and characterization of hyperbranched polyfluorenes containing triarylpyrazoline cores towards efficient blue light-emitting diodes

2007 ◽  
Vol 45 (22) ◽  
pp. 5296-5307 ◽  
Author(s):  
Qiang Peng ◽  
Liushui Yan ◽  
Dezhi Chen ◽  
Fuzhi Wang ◽  
Ping Wang ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting Diodes ◽  
Synthesis And Characterization ◽  
Light Emitting

Synthesis and Characterization of Highly Twisted and Bulky Tetraoctyloxybiphenyl-Containing Polyfluorene Copolymers: Toward Efficient Blue Polymer Light Emitting Diodes

2007 ◽  
Vol 7 (11) ◽  
pp. 3810-3814
Author(s):  
In-Nam Kang ◽  
Sung-Hwan Lim ◽  
Jong-Wook Park ◽  
Kyoung-Soo Kim ◽  
Min-Chul Chung ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Random Copolymers ◽  
Synthesis And Characterization ◽  
Coupling Reactions ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes ◽  
Pl Emission

We have synthesized new blue light emitting random copolymers, poly(9,9′-n-dioctylfluorene-co-2,2′,6,6′-tetraoctyloxybiphenyl-3,3′-diyl)s (PFTOBPs), via Ni(0)-mediated coupling reactions. The PL emission peaks of the resulting copolymers closely resembled those of the polyfluorene (PF) homopolymer. The EL devices fabricated using these copolymers exhibited highly pure blue emission with approximate 1931 CIE coordinates of (0.15, 0.15) at 1000 cd/m2. The maximum brightnesses ranged from 2000 to 12000 cd/m2 with maximum efficiencies from 0.53 to 0.97 cd/A. The efficiencies were found to increase as the fraction of TOBP in the copolymers was increased, which may result the inhibition of exciton quenching that is produced by the introduction of the highly twisted and bulky TOBP moieties into the copolymers.

Synthesis and Characterization of Highly Twisted and Bulky Tetraoctyloxybiphenyl-Containing Polyfluorene Copolymers: Toward Efficient Blue Polymer Light Emitting Diodes

2007 ◽  
Vol 7 (11) ◽  
pp. 3810-3814 ◽  
Author(s):  
In-Nam Kang ◽  
Sung-Hwan Lim ◽  
Jong-Wook Park ◽  
Kyoung-Soo Kim ◽  
Min-Chul Chung ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Random Copolymers ◽  
Synthesis And Characterization ◽  
Coupling Reactions ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes ◽  
Pl Emission

We have synthesized new blue light emitting random copolymers, poly(9,9′-n-dioctylfluorene-co-2,2′,6,6′-tetraoctyloxybiphenyl-3,3′-diyl)s (PFTOBPs), via Ni(0)-mediated coupling reactions. The PL emission peaks of the resulting copolymers closely resembled those of the polyfluorene (PF) homopolymer. The EL devices fabricated using these copolymers exhibited highly pure blue emission with approximate 1931 CIE coordinates of (0.15, 0.15) at 1000 cd/m2. The maximum brightnesses ranged from 2000 to 12000 cd/m2 with maximum efficiencies from 0.53 to 0.97 cd/A. The efficiencies were found to increase as the fraction of TOBP in the copolymers was increased, which may result the inhibition of exciton quenching that is produced by the introduction of the highly twisted and bulky TOBP moieties into the copolymers.

Synthesis and characterization of alternating copolymers derived from indeno[1,2-b]fluorene for blue light-emitting diodes

2012 ◽  
Vol 125 (2) ◽  
pp. 1409-1417 ◽  
Author(s):  
Yangjun Xia ◽  
Chengmei Zhong ◽  
Bin Li ◽  
Hongbin Wu ◽  
Yong Cao ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting Diodes ◽  
Synthesis And Characterization ◽  
Light Emitting ◽  
Alternating Copolymers

Synthesis and Characterization of Thieno[3,4-b]pyrazine Materials for Solution-processible Organic Red Light-emitting Diodes

2011 ◽  
Vol 40 (4) ◽  
pp. 417-419 ◽  
Author(s):  
Qing Li ◽  
Jiuyan Li ◽  
Lijun Deng ◽  
Qian Wang ◽  
Zhanxian Gao ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Red Light ◽  
Synthesis And Characterization ◽  
Light Emitting
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