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

详细信息    查看全文

• 作者：Mohammad A. Islam ; Diomedes Saldana-Greco ; Zongquan Gu ; Fenggong Wang ; Eric Breckenfeld ; Qingyu Lei ; Ruijuan Xu ; Christopher J. Hawley ; X. X. Xi ; Lane W. Martin ; Andrew M. Rappe ; Jonathan E. Spanier
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：January 13, 2016
• 年：2016
• 卷：16
• 期：1
• 页码：681-687
• 全文大小：468K
• ISSN：1530-6992

文摘

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.