No abstract

Two new phases of zirconium tetrakis(8-hydroxyquinolinolate) (Zrq 4) have been synthesised and characterised by single crystal X-ray diffraction. Their electrical, electronic, optical and thermal properties have been studied. Their electron transporting characteristics have been investigated in organic light emitting devices where the two phases show remarkable differences in performance. One of the forms (designated a-Zrq 4) gives significantly lower operating voltage, higher efficiencies and longer lifetime than the other (designated b-Zrq 4) in organic light emitting devices.

Quantum dot lighting emitting diodes are promising candidates for high efficiency and wide colour gamut displays.

The search for stable electron transporters and hole injectors has become particularly intense over the last 12 months as OLED manufacturers are poised to start production of OLED panels. We report here a proprietary electron transporter (E246), which reduces the operating voltage, increases the efficiency and the lifetime of OLEDs made of fluorescent or phosphorescent systems when compared with Alq3 as an electron transporter. We also report a novel proprietary hole injector (buffer, E9363) which also reduces the operating voltage, increases the efficiency and doubles the lifetime compared to CuPC. E246 has been validated on both ULVAC and Tokki vacuum evaporators. These two materials are now available commercially for display manufacturers.

Room temperature intense pulsed light annealing (photonic annealing, pulsed forge) renders the sol–gel derived ZnO films highly conductive and hydrophobic with improved interface with the colloidal quantum dots.