Study of interface properties of electrodes for the Alq 3 base OLEDs

Uddin, Ashraf; Lee, C. B.; Hu, Xiao

doi:10.1117/12.569743

Cited by 1 publication

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“…In this case spectroscopic methods such as scanning tunneling microscopy (STM) [12], transmission electron microscopy (TEM) [13], scanning electron microscopy (SEM) [14] and atomic force microscopy (ATM) [15] are used. Causes for device failures due to crystallization and inter diffusion of organic layers were reported by Adachi et al [16] and Han et al [17].…”

Section: Introductionmentioning

confidence: 99%

Investigation of FIrpic in PhOLEDs via LC/MS technique

et al. 2009

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Abstract:The commercial breakthrough of phosphorescent organic white light sources is presently hampered due to the unavailability of a stable blue phosphorescent emitter material. Moreover, only few analytical investigations have been made regarding the chemical degradation of the phosphorescent emitter materials during the processing or the operation of the devices. Organic light emitting devices (OLEDs) containing phosphorescent metal complexes with iridium as central ion were investigated. Special attention was paid to the chemical degradation of the material. The devices were analyzed by means of high performance liquid chromatography coupled with mass spectrometry (HPLC/MS). Electron spray ionization (ESI) was employed as ionization source. Isomerization phenomena of the blue-green emitting heteroleptic iridium complex FIrpic could be observed after the device manufacture and after operation. These findings could give hints on the mechanisms that influence the lifetime of PhOLEDs based on FIrpic or similar blue emitters.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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