ABSTRACT
We report the distance-dependent energy transfer from an InGaN quantum well to graphene oxide (GO) by time-resolved photoluminescence (PL). A pronounced shortening of the PL decay time in the InGaN quantum well was observed when interacting with GO. The nature of the energy-transfer process has been analyzed, and we find the energy-transfer efficiency depends on the 1/d² separation distance, which is dominated by the layer-to-layer dipole coupling.
Subject(s)
Energy Transfer , Gallium/chemistry , Graphite/chemistry , Indium/chemistry , Luminescent Measurements , Nitrogen Compounds/chemistry , Oxides/chemistryABSTRACT
Spatially-resolved electroluminescence (EL) images in the triple-junction InGaP/InGaAs/Ge solar cell have been investigated to demonstrate the subcell coupling effect. Upon irradiating the infrared light with an energy below bandgap of the active layer in the top subcell, but above that in the middle subcell, the EL of the top subcell quenches. By analysis of EL intensity as a function of irradiation level, it is found that the coupled p-n junction structure and the photovoltaic effect are responsible for the observed EL quenching. With optical coupling and photoswitching effects in the multi-junction diode, a concept of infrared image sensors is proposed.
Subject(s)
Arsenicals/chemistry , Electric Power Supplies , Gallium/chemistry , Indium/chemistry , Refractometry/instrumentation , Solar Energy , Sunlight , Surface Plasmon Resonance/instrumentation , Equipment Design , Materials Testing , Pancreatitis-Associated ProteinsABSTRACT
Nonradiative energy transfer from an InGaN quantum well to Ag nanoparticles is unambiguously demonstrated by the time-resolved photoluminescence. The distance dependence of the energy transfer rate is found to be proportional to 1/d(3), in good agreement with the prediction of the dipole interaction calculated from the Joule losses in acceptors. The maximum energy-transfer efficiency of this energy transfer system can be as high as 83%.
Subject(s)
Gallium/chemistry , Indium/chemistry , Metal Nanoparticles/chemistry , Quantum Dots , Silver/chemistry , Energy TransferABSTRACT
We present the first observation of resonance energy transfer from InGaN quantum wells to Au nanoclusters via optical waveguiding. Steady-state and time-resolved photoluminescence measurements provide conclusive evidence of resonance energy transfer and obtain an optimum transfer efficiency of ~72%. A set of rate equations is successfully used to model the kinetics of resonance energy transfer.
