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Thermal, structural and photophysical properties of the organic semiconductor Alq3
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2004
Year
Aluminium NitrideOptical MaterialsEngineeringOrganic ElectronicsChemistryLuminescence PropertyPhosphorescence ImagingTriplet StatesOptical PropertiesOrganic Semiconductor Alq3Thermally Activated Delayed FluorescenceMaterials SciencePhotoluminescenceFacial IsomerPhotochemistryOptoelectronic MaterialsOrganic SemiconductorPure Facial IsomerOrganic Charge-transfer CompoundElectronic MaterialsApplied PhysicsOptoelectronicsPhosphorescence
This review describes the thermal, structural and photophysical properties of different polycrystalline phases of the organic semiconductor Alq3. In particular the new blue luminescent δ-phase is shown to contain the facial isomer. The results obtained by using differential scanning calorimetry, X-ray diffraction, infrared spectroscopy, transient and delayed photoluminescence measurements clearly demonstrate the existence of this isomer. From the results presented it is now possible to obtain the pure facial isomer of Alq3 in large quantities, providing the basis for further investigations to determine its effects on the performance of organic light-emitting diodes. Furthermore, recent results on the properties of the triplet states in Alq are presented. This includes the population of the electronic excited triplet state due to intersystem crossing and the spectrum of the phosphorescence. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)