Its common knowledge that Oxygen can effectively quench phosphorescence in wide range of materials (e.g. Ir(III) complexes). Furthermore some papers have shown that in air the lifetime of Ir(III) complexes may differ around 2 orders of magnitude (in degassed solution ~2 s^(-6) but in air ~2 s^(-8)). Can we extrapolate this further?
1) So when working with similar compounds which show generic phosphorescence lifetimes in the range of 1-2 s^(-6) and are structurally similar to Ir(III) if the lifetime in degassed solution and in air is unchanging does that mean that the quenching is not present?
2) Is the quenching mostly associated with materials that show high quantum yields or rather specific mechanisms?
Hi Kaspars,
there are a few examples of Ir(III) triplet emitters which are not quenched by triplet oxygen. One possible explanation is that the chromophore is shielded against the attack of O2. If the emission of your Ir(III) complex is not quenched in air, you are lucky and you can add another compound to this short list.
On the other hand there are other triplet quenching molecules such as diethylhexyl-2,6-naphthalate which might be tested.
Dear Kaspars,
Applying the analogy principle it seems that air do not quench the new generic material. As some sort of chemical reaction quenching is based on specific mechanisms. Foe more evidence please see the link:https://photochemistry.wordpress.com/2009/10/30/quenching-mechanisms/
Best wishes
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