Optoelectronic device and methods of use

A method of creating an image on an array of optoelectronic elements comprising

• (a) providing a device comprising an array of optoelectronic elements and circuitry connected to each optoelectronic element,
• wherein the optoelectronic element comprises plural quantum dots or plural nanorods, and
• wherein the circuitry is configured to be capable of switching each optoelectronic element independently between a configuration in which the circuitry provides an effective forward bias voltage that causes the optoelectronic element to emit light and a configuration in which the circuitry provides an effective reverse bias voltage that causes the optoelectronic element to be capable of generating a photocurrent when light to which the optoelectronic element is sensitive strikes the optoelectronic element,
• (b) imposing an effective reverse bias on two or more of the optoelectronic elements,
• (c) providing circuitry that will detect the onset of photocurrent from an individual effective reverse biased optoelectronic element and that will respond to the photocurrent by changing the bias on the individual optoelectronic element to an effective forward bias.