Exploit the Benefit of S0→T1 Excitation in Triplet-Triplet Annihilation Upconversion to Attain Large

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  Os(Ⅱ)complexes are particular interesting for triplet-triplet annihilation(TTA)upconversion,due to the strong direct S0→T1 photoexcitation,as in this way,energy loss is minimized and large anti-Stokes shift can be achieved for TTA upconversion.
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