Systems and methods for energy storage using phosphorescence and waveguides

A system for storing energy, comprising:

• an assembly, comprising:
• a light source comprising an array of light-emitting diodes configured to emit optical energy at a first wavelength from a surface of the array of light-emitting diodes;
• a phosphorescent material configured to receive light from the array of light-emitting diodes, wherein the phosphorescent material is configured to (i) absorb the optical energy at the first wavelength, and (ii) at a rate slower than a rate of absorption, emit optical energy at a second wavelength, wherein the second wavelength is greater than the first wavelength;
• and
• a photovoltaic cell adjacent to the phosphorescent material, wherein the photovoltaic cell is configured to (i) absorb optical energy at the second wavelength through a surface of the photovoltaic cell, and (ii) generate electrical power from optical energy;
• and
• a housing configured to contain the assembly while the assembly is in use.