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Materials 2018, 11(10), 1800;

Hysteretic Photochromic Switching (HPS) in Doubly Doped GaN(Mg):Eu—A Summary of Recent Results

SUPA Department of Physics, University of Strathclyde, 107 Rottenrow, Glasgow G4 0NG, UK
Alternative Energy Materials, CSIR-National Physical Laboratory, New Delhi-110012, India
INESC/MN, IPFN, Instituto Superior Técnico, Universidade de Lisboa, Campus Tecnológico e Nuclear, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal
Department of Mathematical and Design Engineering, Gifu University, Gifu 501-1193, Japan
Kyma Technologies, 8829 Midway West Rd, Raleigh, NC 27612, USA
Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
Institute of High Pressure Physics PAS, Sokolowska 29/37, 01-142 Warsaw, Poland
Author to whom correspondence should be addressed.
Received: 6 July 2018 / Revised: 13 August 2018 / Accepted: 19 September 2018 / Published: 22 September 2018
(This article belongs to the Special Issue III-Nitrides Semiconductor Research in the UK and Ireland)
Full-Text   |   PDF [3547 KB, uploaded 22 September 2018]   |  


Europium is the most-studied and least-well-understood rare earth ion (REI) dopant in GaN. While attempting to increase the efficiency of red GaN light-emitting diodes (LEDs) by implanting Eu+ into p-type GaN templates, the Strathclyde University group, in collaboration with IST Lisbon and Unipress Warsaw, discovered hysteretic photochromic switching (HPS) in the photoluminescence spectrum of doubly doped GaN(Mg):Eu. Our recent work, summarised in this contribution, has used time-, temperature- and light-induced changes in the Eu intra-4f shell emission spectrum to deduce the microscopic nature of the Mg-Eu defects that form in this material. As well as shedding light on the Mg acceptor in GaN, we propose a possible role for these emission centres in quantum information and computing. View Full-Text
Keywords: gallium nitride; rare earth ions; europium; photoluminescence; photochromism; qubit gallium nitride; rare earth ions; europium; photoluminescence; photochromism; qubit

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Edwards, P.R.; O’Donnell, K.P.; Singh, A.K.; Cameron, D.; Lorenz, K.; Yamaga, M.; Leach, J.H.; Kappers, M.J.; Boćkowski, M. Hysteretic Photochromic Switching (HPS) in Doubly Doped GaN(Mg):Eu—A Summary of Recent Results. Materials 2018, 11, 1800.

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