6533b830fe1ef96bd1297021

RESEARCH PRODUCT

Study of voltage decrease in organic light emitting diodes during the initial stage of lifetime

P. Cusumano

subject

Organic light emitting diodes (OLEDs)Lifetime testingMaterials scienceAlq3chemistry.chemical_elementJoule02 engineering and technologySettore ING-INF/01 - Elettronica01 natural sciencesAluminium0103 physical sciencesMaterials ChemistryOLEDElectrical and Electronic Engineering010302 applied physicsThermal equilibriumSteady statebusiness.industryJoule heating021001 nanoscience & nanotechnologyCondensed Matter PhysicsElectronic Optical and Magnetic MaterialschemistryOptoelectronicsConstant current0210 nano-technologybusinessJoule heatingDeep trapVoltage

description

Abstract We report the results of lifetime DC testing at constant current of not-encapsulated organic light emitting diodes (OLEDs) based on Tris (8 idroxyquinoline) aluminum (Alq3) as emitting material. In particular, a voltage decrease during the initial stage of the lifetime test is observed. The cause of this behavior is also discussed, mainly linked to initial Joule self-heating of the device, rising its temperature above room temperature until thermal equilibrium is reached at steady state.

yearjournalcountryeditionlanguage
2016-02-01Solid-State Electronics
https://doi.org/10.1016/j.sse.2015.11.032