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The impact of organic light emitting diodes (OLEDs) in modern life iswitnessed by their wide employment in full-color, energy-saving, flat paneldisplays and smart-screens; a bright future is likewise expected in the fieldof solid state lighting. Cyclometalated iridium complexes are the most usedphosphorescent emitters in OLEDs due to their widely tunable photophysicalproperties and their versatile synthesis. Blue-emitting OLEDs, suffer fromintrinsic instability issues hampering their long term stability. Backed bycomputational studies, in this work we studied the sky-blue emitter FIrpic inboth ex-situ and in-situ degradation experiments combining complementary,mutually independent, experiments including chemical metathesis reactions, inliquid phase and solid state, thermal and spectroscopic studies and LC-MSinvestigations. We developed a straightforward protocol to evaluate thedegradation pathways in iridium complexes, finding that FIrpic degrades throughthe loss of the picolinate ancillary ligand. The resulting iridium fragment wasthan efficiently trapped "in-situ" as BPhen derivative 1. This process is foundto be well mirrored when a suitably engineered, FIrpic-based, OLED is operatedand aged. In this paper we (i) describe how it is possible to effectively studyOLED materials with a small set of readily accessible experiments and (ii)evidence the central role of host matrix in trapping experiments.

Unraveling the degradation mechanism in FIrpic based Blue OLEDs: II. Trap and detect molecules at the interfaces