Surface Chemically Switchable Ultraviolet Luminescence from Interfacial Two-Dimensional Electron Gas.

Abstract

We report intense, narrow line-width, surface chemisorption-activated and reversible ultraviolet (UV) photoluminescence from radiative recombination of the two-dimensional electron gas (2DEG) with photoexcited holes at LaAlO3/SrTiO3. The switchable luminescence arises from an electron transfer-driven modification of the electronic structure via H-chemisorption onto the AlO2-terminated surface of LaAlO3, at least 2 nm away from the interface. The control of the onset of emission and its intensity are functionalities that go beyond the luminescence of compound semiconductor quantum wells. Connections between reversible chemisorption, fast electron transfer, and quantum-well luminescence suggest a new model for surface chemically reconfigurable solid-state UV optoelectronics and molecular sensing.

DOI: 10.1021/acs.nanolett.5b04461

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Cite this paper

@article{Islam2016SurfaceCS, title={Surface Chemically Switchable Ultraviolet Luminescence from Interfacial Two-Dimensional Electron Gas.}, author={Mohammad Amirul Islam and Diomedes Saldana-Greco and Zongquan Gu and Fenggong Wang and Eric Breckenfeld and Qingyu Lei and Ruijuan Xu and Christopher J. Hawley and Xiaoxing X. Xi and Lane W Martin and Andrew M Rappe and Jonathan E. Spanier}, journal={Nano letters}, year={2016}, volume={16 1}, pages={681-7} }