{Efficient|Effective} triplet-triplet annihilation-based photon upconversion (TTA-UC) from visible to UV light {without|with out|without having|with no|devoid of|without the need of} {using|utilizing|making use of|employing|working with|applying} heavy metals {is still|continues to be} a {challenging|difficult} {task|job|activity|process}. {Here|Right here} we {achieve|attain|accomplish|obtain|realize|reach} a record-high TTA-UC efficiency of 20.3% {among|amongst} 100% maximum by employing a ketocoumarin derivative as a triplet sensitizer, which shows {strong|powerful|robust|sturdy} visible absorption, weak UV absorption, and {efficient|effective} intersystem crossing. Price of 149771-44-8 3-Hydroxycyclopentan-1-one manufacturer PMID:23937941
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