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2006) also designed and synthesized two highly efficient blue-emitting fluorene derivatives, 2-pyrenyl-9-phenyl-9-pyrenylfluorene (30a, P1) and 2,7-dipyrenyl-9-phenyl-9-pyrenyl-fluorene (30b, P2). They fabricated devices of ITO/TCTA (8 nm)/P1 or P2 (30 nm)/BCP (40 nm)/Mg: Ag, where the TCTA (4,4’,4”,-tri(Ncarbazolyl)triphenylamine) was used as both the buffer layer and hole-transporting layer, and BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline) as both the buffer layer and electron-transporting layer.

2010), which were synthesized by both Stille and Suzuki-Miyaura cross coupling, respectively. All compounds 19a-d are readily soluble in common organic solvents such as CHCl3, CH2Cl2, THF and toluene, which allows for purification by column chromatography and solution processing. The photophysical properties of 19 were measured by UV-vis absorption and photoluminescence (PL) spectroscopy in chloroform and in thin films. Compounds 19a and 19d show red-shifted wavelength absorption maximum (max) at 451 and 452 nm in comparison to 19b and 19c (max = 394 and 429 nm, respectively) due to their slightly more extended conjugation lengths.

1-, 3-, 6-, and 8-positions) exclusively by the dendrons can lead to interesting dendritic architectures with a well-defined number of chromophores in a confined volume. Thus, pyrene is a fascinating core for constructing fluorescent-conjugated light emitting dendrimers. , 2002) have been widely used as light absorbers, and the energy was efficiently funnelled to the core accepter. 10 42 43 Fig. 6. Polyphenylene-functionalized pyrene-cored light emitting dendrimers (40-43). Synthesis and Photophysical Properties of Pyrene-Based Multiply Conjugated Shaped Light-Emitting Architectures: Toward Efficient Organic-Light-Emitting Diodes 39 which some light emitting dendrimers have been used.

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