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Role of oxygen-bonds in the degradation process of phosphorescent organic light emitting diodes
- Source :
- Applied Physics Letters. 99:053302
- Publication Year :
- 2011
- Publisher :
- AIP Publishing, 2011.
-
Abstract
- For improving the lifetime of organic light emitting diodes (OLEDs), it is essential to understand the chemical reaction pathways involved in the degradation process of these devices. Using the laser desorption/ionization time-of-flight mass spectrometry (LDI-TOF-MS) technique, an OLED based on the phosphorescent emitter tris(phenylpyridine)iridium (Ir(ppy)3) was investigated. We show that the chemical dissociation reaction of the Ir(ppy)3 molecule and an additional complexation of its fragments with the used hole blocking material 4,7-diphenyl-1,10-phenanthroline is the main intrinsic degradation mechanism. This finding underlines the exciton induced dissociation mechanism of phosphorescent emitters, even at emitters without any metal-oxygen-bonds in the ligand system.
- Subjects :
- MALDI mass spectra
time of flight mass spectra
excitons
Physics and Astronomy (miscellaneous)
Chemistry
chemistry.chemical_element
dissociation
Mass spectrometry
Photochemistry
bonds (chemical)
Chemical reaction
organic light emitting diodes
Dissociation (chemistry)
law.invention
phosphorescence
law
OLED
Phosphorescent organic light-emitting diode
Molecule
Iridium
Phosphorescence
organic compounds
Subjects
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 99
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi.dedup.....2544af36106a71765fdd62cc11b60c36