This invention integrates an organic light-emitting diode (OLED), a power-generation device (photovoltaic or PV cell), and an energy-storage device (lithium-ion battery or LIB) to power a grid-free lighting module. PV/LIB/LED voltage and capacity matching ensure maximal energy storage and optimal conversion efficiency.

The outermost layer (i.e. the one facing the external environment), consists of a transparent electrode. The material can therefore serve as a substitute for glass in windows.

Working inward, the next stratum generates power and includes a PV absorbing layer and PV electrode. Following this is the energy-utilizing component, an OLED layer that allows for the transportation and emission of electrons. Finally, an indium tin oxide (ITO) layer — flanked by batteries — rests atop the system's transparent substrate. With vast market potential, the invention could substantially reduce residential and commercial energy costs.

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Lighting Technology Magazine

This article first appeared in the January, 2012 issue of Lighting Technology Magazine.

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