%0 Journal Article %T Optically coupled engineered upconversion nanoparticles and graphene for a high responsivity broadband photodetector %A Thakur, Mukesh Kumar %A Gupta, Akash %A Fakhri, Muhammad Yusuf %A Chen, Ruei San %A Wu, Chien Ting %A Lin, Kung Hsuan %A Chattopadhyay, Surojit %J Nanoscale %V 11 %N 19 %P 9716-9725 %@ 2040-3364 %D 2019-05-16 %I The Royal Society of Chemistry %~ DeepDyve