Tunable emission of polymer light emitting diodes bearing green-emitting Ir(III) complexes: The structural role of 9-((6-(4-fluorophenyl)pyridin-3-yl)methyl)-9H-carbazole ligands

These findings suggested that by substituting an electron withdrawing fluorine atom within the ligand, the HOMO energy levels could be tuned, thereby increasing the bandgap energy

Min Ju Cho; Jung-Il Jin; Dong Hoon Choi; Jung Hee Yoon; Chang Seop Hong; Young Min Kim; Young Wook Park; Byeong-Kwon Ju

2009

Scholarcy highlights

  • Of the various types of light-emitting organic materials available, phosphorescent materials have been recognized as superior candidates because both singlet and triplet excitons can generate unique light emissions, with a theoretical internal quantum efficiency of 100%,,
  • The influence of the host materials was studied and the best performance was achieved with both PVK and PBD in the emissive layer, with the resulting organic light-emitting diodes exhibiting a current efficiency of 0.84 cd/A, a power efficiency of 0.20 lm/W, and an external quantum efficiency of 0.66% at a brightness of 2548 cd/m2
  • This paper reports that the optical properties of anthraquinone and its photo-catalytic performance in the visible light-driven p-xylene oxidation can be fine-tuned and improved through varying its skeleton substituents at the molecular level, and the electron-withdrawing substituent exhibits a better improvement effect than the electron-donating one
  • The formation of photoactive species in the Keggin-type XPMo12-nVnO40 polyoxometalates. tetrabutyl or cetyltrimethyl ammonium cation)-HCl system was researched in details by UV–vis and its photo-catalysis performance evaluated via the oxidation of cyclohexane by dioxygens in acetonitrile under visible light irradiation The results showed that the VV-O-M sites of POM can capture HCl to form a protonated photoactive species and the solvent MeCN likely participates the formation of such PA species via weak coordination
  • The addition of benzenesulfonic acid in the above photocatalytic system can further increase PX conversion to 86.7%, along with a significant improvement in the selectivity of p-carboxybenzaldehyde and terephthalic acid, which likely originates from the unique recombination behavior of the photo-generated charge carriers of the catalyst and the additive driven by the strong interactions between their aromatic skeletons and acidic substituents
  • We present experimental and theoretical study on parametric instability of downward propagating C2H4/O2/CO2 flames at two different Le of 1.0 and 0.8
  • It was intriguing that introducing one 3b instead of 3a yielded a hypsochromic shift of 5 nm in the PL spectrum of Ir(Cz-ppy), relative to that of the green-emitting

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