Read this week’s hot articles on phosphorescent OLEDs, an electrophosphorescence polymer and targeting QDs.

Graphical abstract: Highly efficient solution-processed green and red electrophosphorescent devices enabled by small-molecule bipolar host materialHighly efficient solution-processed green and red electrophosphorescent devices enabled by small-molecule bipolar host material: A solution-processable host molecule TPO comprised of hole-transporting triphenylamine and electron-transporting oxadiazole has been synthesized by a team of Chinese scientists. The team used these materials to create a device with an efficiency of 56.8 cd A−1, which they say is among the highest ever reported for small-molecule based green phosphorescent OLED fabricated by a wet process. (J. Mater. Chem., 2011, DOI: 10.1039/C1JM10987A, Advance Article)

Graphical abstract: An ambipolar poly(meta-phenylene) copolymer with high triplet energy to host blue and green electrophosphorescenceAn ambipolar poly(meta-phenylene) copolymer with high triplet energy to host blue and green electrophosphorescence: A conjugated polymer with a hole transporting carbazole unit and an electron transporting oxadiazole unit incorporated into a poly(meta-phenylene) backbone was prepared by scientists at the University of California, Los Angeles, USA. The carbazole unit raises the polymer’s HOMO energy level to enhance hole injection, while the oxadiazole unit lowers the LUMO energy level, to boost electron injection. The PPLED devices with PmPCz-Ox doped with green or blue phosphorescent dopants as the active layer emits exclusive phosphorescent light from the dopants. (J. Mater. Chem., 2011, DOI: 10.1039/C1JM11212K, Advance Article)

Graphical abstract: γ-Cyclodextrin–folate complex-functionalized quantum dots for tumor-targeting and site-specific labelingγ-Cyclodextrin–folate complex-functionalized quantum dots for tumor-targeting and site-specific labeling: Chinese scientists have synthesized a series of folate-receptor targeted QDs, in which tumor-targeting folic acid was conjugated to the surface of QDs through cell-penetrated γ-cyclodextrin. The team claim that the QDs showed good optical properties and biocompatibility. (J. Mater. Chem., 2011, DOI: 10.1039/C1JM11066G, Advance Article)

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