@article { , title = {Influence of substituent position on thermal properties, photoluminescence and morphology of pyrene-fluorene derivatives}, abstract = {New position-dependent conjugated hydrocarbon dyes containing a pyrene core and multi-fluorene moieties 3 have been synthesized and characterized by ¹H/¹³C NMR spectroscopy, as well as by optical and theoretical studies. The solubility of mono-, bis- and tetra-fluorenyl–pyrene 3 tends to decrease and leads to varied thermal properties. The results of the optical studies and DFT calculations revealed that the energy gap can be easily modified or fine-tuned by either varying the substituent number or position. Remarkably, such pyrene–fluorene materials exhibited deep blue fluorescence (λmax = 400–458 nm in CH₂Cl₂) with excellent quantum yields (≈78\%). These results suggest that these new pyrene–fluorene derivatives have potential application in OLED technology as blue host materials.}, doi = {10.1016/j.molstruc.2015.01.018}, issn = {0022-2860}, issue = {April}, journal = {Journal of molecular structure}, pages = {216-222}, publicationstatus = {Published}, publisher = {Elsevier}, url = {https://hull-repository.worktribe.com/output/376714}, volume = {1086}, keyword = {Specialist Research - Other, Pyrene–fluorene derivatives, Suzuki cross-coupling reaction, Photoluminescence, Structure–properties relationship}, year = {2015}, author = {Feng, Xing and Hu, Jian-Yong and Wei, Xian-Fu and Redshaw, Carl and Yamato, Takehiko} }