Blue light emitting polymers

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S. Zheng, J. Shi, and R. Mateu, Novel blue light emitting polymer containing an adamantine moiety, Chem. Mater., 12 1814—1817, 2000. 

J.-H. Lee and D.-H. Hwang, Alkoxyphenyl-substituted polyfluorene a stable blue-light-emitting polymer with good solution processability, Chem. Commune. 2836-2837, 2003. 

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J.H. Park, Y.T. Lim, O.O. Park, J.K. Kim, J.-W. Yu, and Y.C. Kim, Polymer/gold nanoparticle nanocomposite light-emitting diodes enhancement of electroluminescence stability and quantum efficiency of blue-light-emitting polymers, Chem. Mater., 16 688-692, 2004. 

W.-L. Yu, J. Pei, Y. Cao, W. Huang, and A.J. Heeger, New efficient blue light emitting polymer for light emitting diodes, Chem. Commune. 1837-1838, 1999. 

S.-A. Chen and C.-I. Chao, Poly(2-alkoxy-p-phenylene)s as deep-blue light-emitting polymers, Synth. Met., 79 93-96, 1996. 

V. Deimede, J.K. Kallitsis, and T. Pakula, Synthesis and properties of amorphous blue-light-emitting polymers with high glass-transition temperatures, J. Polym. Sci., Part A Polym. Chem., 39 3168-3179, 2001. 

Based on the presence of carbazole substituents, the blue-light emitting polymers (198) and (199) appear to be attractive materials for electroluminescence applications. Related polyphosphazenes (200) have been prepared aiming at photoreactive materials. " ... 

Methods 1 and 4 are currently the most promising ones for realizing multicolor devices. The latter method exhibits the advantage that the whole display can be built up with the same blue-light-emitting polymer LED, so that the same I-V response for all pixels (in contrast to the method 1) can be expected. 

In addition to the opportunity to increase the overall device performance in LEDs based on polymer blends,126 127 another interesting aspect is that their emission color can be internally converted.128-130 Based on blue-light-emitting polymers,131 therefore, any other emission color can be realized for those also, which intrinsically are difficult to achieve with pure conjugated polymers, as is the case for pure white132,133 and red134,135 emission colors. 

Chao C I and Chen S A, "White light emission from exciplex in a bilayer device with two blue light-emitting polymers" Appl Phys, Lett 73 1998 426. 

HGURE 2.5 (fii Chemical structures of blue light-emitting polymers 84-89. (B) Chemical structures of white light-emitting polymers 90-92. 

Similar to the design of blue light-emitting polymer, introducing sterically hindered groups to the phosphor or the polymer host is also an efficient approach to reduce the triplet energy back transfer. With this in mind, Yang and coworkers introduced the sterically... 

Huang, E, Zhang, Y, Liu, M.S., Cheng, Y.J., Jen, A.K.Y., 2007. High-efficiency and color stable blue-light-emitting polymers and devices. Adv. Funct. Mater. 17,3808-3815. 

Liu, R., Xiong, Y, Zeng,W.,Wu, Z., Du, B.,Yang,W, Sun, M., Cao,Y, 2007. Extremely color-stable blue light-emitting polymers based on alternating 2,7-fluorene-co-3,9-carbazole copolymer. Macromol. Chem. Phys. 208, 1503-1509. 

Polyfluorene is an important blue light-emitting polymer which has been studied for applications in the emissive layers in LEDs because of its high chemical and thermal stability as well as its high fluorescence quantum yield [63],... 

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