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A Novel Method to Synthesize Blue-Luminescent Doped GaN Powders

Published online by Cambridge University Press:  01 February 2011

R. Garcia ,
A. Thomas ,
A. Bell  and
F. A. Ponce
R. Garcia
Affiliation:
Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85281-1504
A. Thomas
Affiliation:
Rogers Corporation, Durel Division, Chandler, AZ 85224-6155
A. Bell
Affiliation:
Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85281-1504
F. A. Ponce
Affiliation:
Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85281-1504
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Abstract

A new method to synthesize highly luminescent GaN:Mg powders has been developed. This method has a high control over the concentration of magnesium in the final product. The method consists of reacting a high purity (99.999 %) galliummagnesium alloy with ultra-high purity ammonia in a horizontal quartz tube reactor at high temperatures for several hours. Electron microscopy showed that the light-gray powders produced by this method consist of at least two different shaped crystallites; large columnar crystals sized around 10 μm and small platelets crystals between 1 and 2 μm. X-ray diffraction showed that those crystallites have a well defined wurtzite structure. Room temperature photoluminescence (PL) and cathodoluminescence (CL) showed a high intensity blue emission around 2.94 eV (422 nm). At helium temperature the well known Mg-related donor-acceptor pair band was observed at 3.25 eV (380 nm) by PL and CL.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 864: Symposium E – Semiconductor Defect Engineering-Materials, Synthesis Structures and Devices , 2005 , E6.10
Copyright
Copyright © Materials Research Society 2005

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