Not a physicist. Usually, reactions are reversible. So if quantum dots can be used to emit the “brightest” of a band of colors from electricity; then perhaps

Not a physicist. Usually, reactions are reversible. So if quantum dots can be used to emit the “brightest” of a band of colors from electricity; then perhaps the reverse is true: They can be used to more efficiently absorb the same color bands and turn them into electrons. Or, this is just “more funding please” talk.