CHEMICALLY SWITCHABLE ULTRAVIOLET PHOTOLUMINESCENCE

摘要

The present disclosure pertains to the use of intense, narrow-linewidth surface, chemically-switchable ultraviolet photoluminescence from radiative recombination of the two-dimensional electron liquid with photo-excited holes in complex oxide heterostructures, such as LaAlO3/SrTiO3 (LAO/STO). Such photoluminescence from the interface between the upper and lower layers can be suppressed and restored reversibly under oxidizing and reducing conditions, respectively, as induced by chemisorption and reversal of chemisorption on the exposed surface of the heterostructure's upper member. Making use of this chemically-switchable ultraviolet photoluminescence, the present disclosure provides, inter alia, systems for detection of a chemical species, methods for determining the absence or presence of a chemical species in a sample, optoelectronic devices, and methods for producing optoelectronic devices.

主权项

1. A system for detection of a chemical species comprising:
a complex oxide heterostructure comprising an upper member having an exposed surface, a lower member, and an interface between the upper and lower members,
wherein chemisorption of said chemical species at the exposed surface of the upper member produces ultraviolet photoluminescence at the interface between the upper and lower members, andwherein said upper member has a thickness of up to about 30 unit cells; and, a sensor for determining the absence or presence of ultraviolet photoluminescence at the interface.