Abstract
We consider a hybrid heterostructure containing an inorganic quantum well in close proximity with organic material as overlayer. The resonant optical pumping of Frenkel exciton can lead to an efficient indirect pumping of Wannier excitons. As organic material in such a hybrid structure, we consider crystalline tetracene. In tetracene, the singlet exciton energy is close to twice the one of triplet exciton state and singlet exciton fission into two triplets can be efficient. This process in tetracene is thermally activated and we investigate here how the temperature-dependent exciton energy transfer affects the functional properties of hybrid organic-inorganic nanostructures. We have obtained the exact analytical solution of diffusion equation for organics at different temperatures defining different diffusion lengths of excitons. The effectiveness of energy transfer in hybrid with tetracene was calculated by definite method for two selected temperatures that open possibility to operate in full region of temperatures. Temperature dependence of energy transfer opens a new possibility to turn on and off the indirect pumping due to energy transfer from the organic subsystem to the inorganic subsystem.
Highlights
Optical properties of hybrid organic—nonorganic nanostructures for different applications have attracted interest in theory and experiments [1]-[7]
The singlet exciton energy is close to twice the one of triplet exciton state and singlet exciton fission into two triplets can be efficient. This process in tetracene is thermally activated and we investigate here how the temperature-dependent exciton energy transfer affects the functional properties of hybrid organic-inorganic nanostructures
Numerous publications of mentioned hybrid structures including the system of Wannier and Frenkel exciton states and the transfer energy from a very thin layer of semiconductor to the layer of organics were demonstrated
Summary
Optical properties of hybrid organic—nonorganic nanostructures for different applications have attracted interest in theory and experiments [1]-[7]. Such indirect pumping of QW can be very efficient if the light from external pumping beam will resonantly generate Frenkel excitons in the organic overlayer with energies significantly larger than the exciton energy in the semiconductor QW. This, in turn, opens the possibilities of an unusual temperature dependence of the energy transfer from the tetracene thin layer to semiconductor QW
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